brosura decra august 06 (en)

Decra Roof Systems Ltd

Unit 3

Faraday Centre

Faraday Road

Crawley, West Sussex

RH10 9PX

Tel: 01293 545 058

Fax: 01293 562 709

Web: www.decra.co.uk

DECRA

Roofing System

The Way Forward for Roofing

CI/SfB| | (42) | Nh2 | |

®

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Intr

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Decra Roof Systems wasfounded in the UK and Irelandin 1977 when the companyintroduced the world’s firstlightweight roof tile – the Decra tile.

This revolutionary new product combined great

strength with very low weight, offering the

benefits of:

n Easy handling

n Fast installation

n Exceptional durability

n Low maintenance

Decra tiles comprise a core of galvanised steel with

a multi-layered protective coating and granular finish,

offering the appearance of traditional clay or

concrete pantiles combined with exceptional

performance characteristics.

Since their introduction, Decra tiles have been

proven on all types of building, in new-build and

refurbishment projects and in all climates across the

globe, from the sub zero temperatures and high

winds of Canada to the extreme heat, humidity and

salt laden environment of areas such as the

Maldives.

Decra tiles are now by far the most popular

lightweight tile in the world, manufactured in four

continents and sold in over 70 countries. The

number of Decra tiles installed in the UK and Ireland

exceeds ten million square metres (the equivalent of

around 155,000 average terraced houses)

Extensive product range

Decra operates a policy of continual product

development, and Decra tiles are now available in six

different profiles, two gauges and a wide variety of

colour finishes - with bespoke colours available to

order, (dependant upon quantities). Finishes are

ceramically glazed for long term colour stability.

In addition, the Decra system offers a wide range of

accessories, including underlays and membranes,

ventilation systems, eaves protection systems, warm

roof insulated tile support systems and the Icopal

rainwater system.

Unique, comprehensive guarantee

Decra’s products are developed and manufactured

to ISO 9001 and covered by British Board of

Agrément certificates. They are also supplied with a

unique 30 year guarantee covering not just the tiles

but the complete weather security of the entire roof.

Decra also offers a comprehensive service guarantee

to ensure all customer enquiries are handled

competently, efficiently and reliably.

Decra Roof Systems

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Intr

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A member of the Icopal Group

Decra is a member of the Icopal Group, a leader in

the European construction industry for almost 130

years. The Group is the world’s largest supplier of

stone-coated, steel-based roofing tiles and, in

Europe, has two giant manufacturing plants to

guarantee product supply. In addition, the Group is

one of the world’s largest manufacturers of roofing

felts, and produces the high performance Icopal

rainwater system for durable and highly efficient roof

drainage.

Our manufacturing plants have more than 3,357

employees at 77 offices and 27 production sites

located in the UK, Belgium, Czech Republic,

Denmark, Finland, France, Germany, Norway,

Poland, Slovakia, Sweden and the USA.

One of our manufacturing plants Decra a/s has been

honoured with the special EU award for occupational

safety and health. This prestigious award was

conferred in Bilbao, Spain, by The European Agency

for Safety and Health at Work in connection with the

events of The European Week for Safety and Health

at Work in November 2003.

Investor in People

Decra Roof Systems values

and respects the people

employed by the company.

Our ongoing staff development programmes and

commitment to staff involvement and open

communications meet the ‘Investor in People’

standard, and the company is a fully accredited

member of the Investor in People programme.

Our manufacturing plant Decra a/s hasbeen honoured with the special EUaward for occupational safety andhealth.

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Decra Classic Page 34

Offering the traditional Classic profile and appearance.

Decra Plus Tile Page 38

The same profile as Decra Classic, but twice as thick to

provide exceptional strength and impact resistance.

Decra Stratos Page 42

A simple, linear accented design, which in grey provides the

appearance of a slate roof.

Decra Oberon Page 46

Offers the same mellow appearance as traditional, natural clay

plain tiles, but at a fraction of the weight and with the

additional benefit of exceptional strength and security.

Parctile 0

A distinctive modern, angular design.

Decra Elegance Page 54

The Decra Elegance tiles smooth, high lustre finish

provides a unique opportunity to explore and

exploit the pure fluid design integrity of steel.

Ventilation Systems Page 58

Integrated eaves, ridge, hip and tile ventilation units provide

simple and effective solutions for roof ventilation to Building

Regulation requirements.

Underlays and Membranes Page 60

Includes Decra 700 Breather membrane and a choice of high

performance polyethylene underlays.

Eaves Protection Systems Page 62

Highly UV resistant, polymeric eaves protection systems.

Offering a robust and durable alternative to underlay at eaves,

in line with the recommendations of BS 5534: 2003 (Code of

Practice for Slating and Tiling).

Warm Roof Insulated Tile Support Systems Page 63

Providing combined tile support and built in insulation to

Building Regulations requirements. Enables faster construction

with lower installation costs and it’s advanced composite

design virtually eliminates the potential for construction defects

to occur.

Icopal Rainwater System Page 64

Plastisol coated steel system in traditional half round profile.

Offers great strength, durability, vandal resistance and almost

no maintenance requirements.

Decra supplies not just the products shown

below, but the finest care packages tailored

to the individual needs and preferences of

the professional specifier and, consequently,

the owner of the building.

Our 30-year weather security guarantee on

the whole roof comes as standard and

automatically.

But, depending on what further risks you

want to eliminate, there are three other,

unique service packages that can include

insurance backed guarantees and protection

against latent defects.

Decra TilesDecra offers a choice of six tile profiles, available in a wide range of colours.

Complete roofing solution

Risk Elimination Services Page 6

BronzeSpec, SilverSpec and GoldSpec. Three superior service

offerings designed to nullify risks at a level you choose.

Icopal rainwater system 64

Tools 66

Properties and performance 67

DESIGN GUIDE 72

Design & installation considerations 73

n New build 74

n Refurbishment projects 74

n Flat to pitched roof conversions 74

n Exposure and wind loading 74

n Low pitched roofs 74

n Cut edges 74

n Specification writing 74

n Tile bonding options 75

n Underlays & breather membranes 75

n Tile battens 76

n Control of Condensation 78

Design & installation detailing

n Eaves 84

n Tile ventilators 88

n Verges/Gables 90

n Abutments at sides & top edges 92

n Ridges – unventilated 96

n Ridges – ventilated 98

n Monopitch ridges – unventilated 102

n Monopitch ridges – ventilated 102

n Hips – unventilated 104

n Hips – ventilated 106

n Valleys 108

n Velux windows 110

n Vertical tiling 114

n Mansards & changes in pitch 116

n Gas flue ridges 118

n Icopal rainwater systems 120

SUPPORT 6

Roofing solutions and specification services 6

Summary of specification services 8

Insurance backed guarantees 9

Comprehensive technical support 10

Decra product guarantee 12

Decra service promise 14

CASE STUDIES 16

For all climates and conditions 16

The right choice for:

n Housebuilding 18

n Local authority, housingassociation & public buildings 20

n Retail development 22

Re-roofing a low pitch school roof 24

Flat to pitch roof conversion 26

New build housing 28

Modular social housing residential development 30

PRODUCT GUIDE 32

Overview 32

Products and accessories 33

n Decra Classic 34

n Decra Plus Tile 38

n Decra Stratos 42

n Decra Oberon 46

n Parctile 50

n Decra Elegance 54

DecraVent ventilation systems 58

Underlays, membranesand associated accessories 60

Eaves protection systems 62

Warm roof insulatedtile support system 63

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Contents

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ESTIMATING AND ORDERING 124

n Estimating services 125

n Estimating services 126

n Estimating 130

n Ordering and delivering 129

SITEWORK 130

Safety and CDM risk assessment 132

Transport, handling, storage 133

Using Decra tools 134

n Forming a top upstand 134

n Forming a side upstand 135

n Forming a raking cut atHips & Valleys 135

NOTES 136

ENQUIRY FORM 140

INDEX 142

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Start facing up to the hard facts of a construction project,then you will finish with a winning solution from Decra

This is our standard

specification and

support package.

Standard to us, but

demonstrably a unique and

superior service to that offered by any other

manufacturer of lightweight roof tiles.

We can provide a detailed Decra project

specification, with all specification clauses

cross referenced to current codes of

practices and standards. This specification

package will also include a list of local Decra

Contractor Partners and Decra Registered

Contractors, all of which have been trained

by Decra’s directly employed training officers

to ensure the quality of their workmanship.

Professional specifiers also have the choice

of our SilverSpec or GoldSpec service.

Select one of these and we will make a

guaranteed commitment to you that must be

unequalled in the industry – before, during

and after completion of your project. All we

ask in return is for your commitment to

specify Decra.

Provides

all the

benefits of

Decra’s

BronzeSpec service

PLUSDecra’s trained technical support team will

liaise closely with your appointed Decra

contractor prior to and during the installation

of your roof to ensure it is of the highest

quality. On completion, a full report will be

produced for you confirming the quality of

workmanship, and we will continue to

monitor the quality and condition of the roof

for the next 30 years.

Provides

the

ultimate in

protection for

your client’s

investment for the next 30 years.

Provides all the benefits of Decra

BronzeSpec and SilverSpec service

PLUSDecra Roof Systems products are certified

as an approved roof covering within the

Alliance Warranty Management scheme,

through which an enhanced FSA regulated,

insurance based warranty is available to our

clients. To comply with the scheme it will be

necessary for our clients to use an AWM

approved Decra Contractor Partner for the

installation.

As an audited and approved member of the

Alliance Warranty Management scheme we

are able to introduce to you a unique

package of:

n Warranty audit schemes,

n FSA regulated insurance backed

guarantees

n Latent defects guarantees.

Decra Roof Systems is prepared – and equipped – to confront all these issues with confidence. We have formulated exclusive solutions to eliminate all risk in roof ownership for you and your clients.

At Decra, we are dedicated to working with you to eliminate all levels of riskfrom the design and specification process, the construction process and

the long-term (30 years) ownership of your project’s roof.To this end, we have formulated exclusive packages of care,

BronzeSpec, SilverSpec and GoldSpec, to provide you with three distinct services toenable you to determine the risks you wish to eliminate. The choice is yours.

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facts of a construction project,winning solution from Decra

Decra Roof Systems has in our opinion

one of the most reliable roof tiles in the

marketplace, with a proven 30 year

track record of success. Our quality of

product and manufacturing systems

are second to none. We can talk for

hours about how our product is better

than our competitors.

HOWEVER, quality of product alone

WILL NOT save you or your client from

a bad job, nor from the loss of

reputation, the liability of incorrect

design or from the cost of rectification.

Why do construction projects

go wrong?

Construction projects rarely go wrong due

to the roof tile itself, roof tiles are relatively

inert and their performance only becomes

an issue when a contractor has installed

them.

Problems occur due to;

n Skills shortages, the use of labour

untrained in the application of metal tile

systems and their integration with other

roofing components.

n Poor supervision leading to incorrect

installation.

n Vague or poorly detailed specification left

to the interpretation of an individual

installer (often the least trained member

of the construction team).

n Incorrect specification (inappropriate

detailing and failure to comply with

building regulations and codes of

practice).

Managing Risk: Incorrect Installation

Prior to completion of the roof; reputable

roofing contractors are normally willing to

rectify faults in their workmanship, but this

inevitably leads to delays in completion

dates and begs the question “if they

couldn’t get it right the first time, where

have they now acquired the necessary skills

to get it right on a second attempt”.

After the completion of the roof; reputable

roofing contractors are normally willing to

rectify faults in their workmanship, however

if this contractor has ceased to trade, the

cost of rectification lies with the building

owner and if alternatively the ownership of

the contractor has changed the cost of

rectification may still lies with the building

owner.

Managing Risk: Manufacturers

Guarantees & Warranties

Whilst many manufacturers offer long term

material guarantees and warranties they do

not inspect or audit the project on a regular

basis, regular being weekly. This can be

viewed by clients as a weakness in the

warranty, as most problems which occur

with system installations are usually a direct

result of poor workmanship, or poor

understanding of the requirements needed

to meet building regulations.

Most manufacturers understandably will not

honour guarantees and warranties when

their product has been incorrectly installed;

once again this leaves the building owner to

foot the bill for any rectification problems.

Should the roof tile manufacturer cease to

trade, who pays for the rectification of a

problem roof.

How long has the roof tile manufacturer

been trading? Are you being offered long

guarantees and warranties from a company

that has only been trading for a short while?

What is the roof tile manufacturer’s ability to

honour their guarantees? Are they financially

transparent with sufficient backing to

honour a claim?

What happens if there is a change of

ownership in the roof tile manufacturer or

a name company name change, Is the

guarantee and warranty till valid?

(often this is not the case).

Why create problems for yourself by specifying just a roof tile

We have formulated exclusive solutions to eliminate all risk in roof ownership for you and your clients.

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All of the benefits of the Decra’s

BronzeSpec and SilverSpec services:

PLUS

Enhanced FSA regulated, insurance

based warranty delivered to you under

the Alliance Warranty Management QA+

banner.

What is QA+? It is in effect an Insurance

Backed Guarantee for installed systems

including materials and labour,

independently insurance backed, with

access to it only available through

audited technical accreditation. AWM’s

unparalleled efficiency is based on the

strength and integrity of its absolute

commitment to the provision of quality

through a rigid pre-site and on-site

quality assessment and auditing

programme, which cannot be fudged or

taken lightly by any party to the project.

A range of services is offered:

n QA+

n QA+Latent Gold

n QA+ Insurance Backed Guarantee Scheme (valid for 10 years following practical completion of the works).

n QA+ Independent Audit Warranty –Not Insured

Conditions:

1. Availability of insurance is dependent on

approval by our insurers. For such insurances to

be available they need to be applied for as early

as possible in the specification process (i.e. NOW).

2. To receive the benefits of the Decra GoldSpec it

is a condition that your appointed installer must be

an AWM approved Decra Contractor Partner.

Important Note: For comprehensive

information on AWM and the QA+ Insurance

Product portfolio please contact Decra’s

Technical Department, who will arrange a

meeting between yourselves and AWM and

the scheme’s insurers, Oval Insurance

Broking Ltd.

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1. Technical literature.

2. Decra Direct Website Technical/CAD

Library.

3. Free Estimating Service.

4. Local technical support from

Decra’s technical services team.

Decra’s trained technical support

team will also:

5. Carry out a full survey and complete

a comprehensive report to provide the

solutions that are necessary for a

trouble-free roof.

6. Provide a customised project

specification covering every aspect of

the roofing process.

7. Provide assistance in liaising with

planning departments.

8. Value Engineering and Budget

Costings.

9. Access to a trained network of

Decra Contractor Partners and Decra

Registered Contractors.

In addition, Decra Roof Systems will

provide you with:

10. A no quibble 30 year weather

security guarantee.

Conditions:

1. All we require is for you to defend our

product against product substitution by

products of a lesser specification, which are

backed by lower service and support.

2. We do not insist on your choice of installer

BUT we strongly recommend the use of a Decra

Registered Contractors or Decra Contractor

Partner. What benefit is there for you or your

client to use untrained or unregulated Decra

installers?

If there are problems caused by poor installation

by contractors, who are not Decra Registered

Contractors or Decra Contractor Partners, we

reserve the right to make a charge for site visits

and written rectification reports.

However, in the unlikely event that there is any

problem with the product we have supplied to

you, we will naturally make no charge for site

visits or for rectification of the problem.

All of the benefits of the Decra

BronzeSpec service:

PLUS

Decra Contractor Partner Liaison

service including;

1. Project technical briefing meetings

with your appointed Decra contractor

and with any other members of the

project team who wish to attend.

2. Full review of any non-standard

detailing or unique facets of your roof

and, where necessary, arrange

supplementary training for the

installers.

3. If necessary, create mock-up

structures of unique interfaces at the

Decra Training Centre. In addition,

Decra Roof Systems will also provide

you with:

4. Project Completion Report.

5. Provide a comprehensive O & M

handover manual.

6. Ongoing 5 yearly inspections of the

completed roof and a comprehensive

condition report for the next 30 years.

Conditions:

1. All we require is for you to defend our

product against product substitution by

products of a lesser specification, which are

backed by lower service and support.

2. Availability of Decra SilverSpec service is

dependent on this service being applied for as

early as possible in the specification process

(i.e. NOW).

3. To receive the benefits of the Decra

SilverSpec it is a condition that your appointed

installer must be selected from our list of Decra

Registered Contractors and Decra Contractor

Partners.

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The Alliance has an invitation only

membership comprising leading

companies within the roofing and

cladding industry.

Membership is based on industry-

leading recognition, manufacturing

expertise and strong quality

management, and each member has to

submit to a stringent technical audit

before admission.

QA+ is the brand name of a group of AWM

products and is a guarantee for installed

systems, and includes both materials and

labour. It is independently insurance backed,

with access to it only available through

audited technical accreditation. AWM

provides this accreditation and is totally

committed to the provision of quality not

only through this accreditation, but also

through a thorough and regular on-site

quality assessment and auditing

programme.

However, QA+ is more than just an

insurance backed guarantee. Quality

assessors will be auditing on site at regular

intervals throughout the project. Every visit

will require a Quality Plan and Site Audit

form that will be completed, agreed, and

signed off by each party represented on the

site, including the general contractor. Other

issues, including acoustics, Part L & J of the

Building Regulations and fire regulations, will

all be considered – as the design requires –

at every stage and at every visit.

QA+ Latent Gold

Latent Gold is a unique latent defect insurancedesigned for commercial properties. This is a result ofa commercial partnership involving LABC Services,Oval Insurance Broking Limited and Allianz GlobalRisks, the underwriters.

What does Latent Gold Cover?

Latent Gold provides protection to building owners,occupiers and other parties that may have an interestin any newly constructed commercial property.

The cover protects against damage, or the threat ofcollapse, due to a defect in the structure of thebuilding that remains undiscovered at the date ofpractical completion of the building.

Policy cover applies for 10 or 12 years and protectsagainst:

1. Defective design

2. Defective workmanship

3. Defective materials

How does the QA+ Latent Gold differ from theQA+ Insurance Backed Guarantee?

The QA+ Latent Gold guarantee applies to any newbuild commercial property, insures the structure of thebuilding and protects against damage resulting frominherent defects.

Cover for the QA+ Insurance Backed Guarantee willapply to the roofing and/or cladding elements of aproperty following the contractor ceasing to trade.

QA+ Insurance Backed Guarantee

AWM, in partnership with Oval Insurance BrokingLimited, has negotiated an exclusive Insurance BackedGuarantee available to all contracts utilising the AWMaudit procedure.

Such is the insurer’s confidence in the AWM process,they will provide an Insurance Backed Guarantee forroofing and cladding

works for 10 years following practical completion ofthe works.

The AWM audit is designed to provide a defect freeproduct at completion, but the Insurance BackedGuarantee provides further comfort against:

1. Damage caused by defects arising from poorworkmanship.

2. Damage caused by defects arising from defectivematerials.

3. Damage resulting from defects in the design.

4. Non-compliance with Part L of the Building Regulations.

Cover is provided should the original contractor ceaseto trade at any point during the 10 years followingpractical completion of the works.

Important questions and answers on the QA+Insurance Backed Guarantee Scheme.

1. Does the QA+ Guarantee cover thecontractor’s workmanship?

YES. The QA+ Guarantee Scheme is a guarantee thatcovers against defective workmanship of the installingcontractor.

The guarantee also protects against defective materialsand defective design.

2. If it includes workmanship, is it independentlyinsurance backed?

YES. The QA+ guarantee is independently insured andis administered by Oval Insurance Broking Limited,who are authorised and regulated by The FinancialServices Authority.

3. What is covered?

QA+ Insurance Backed Guarantee provides insuranceagainst defective workmanship, materials or design inthe event that the installing contractor has ceased totrade. The guarantee goes on to include non-compliance with Part L of the Building Regulations.The cover applies for a 10-year period followingpractical completion of the works.

4. Can any contractor apply for a QA+Guarantee?

NO. Only AWM/Oval audited and insurer approvedcontractors can apply for a QA+ Guarantee.Application to AWM/Oval must take place before workcommences on site.

5. Can any product be used within a QA+Guarantee?

NO. Only products and companies like Decra thathave been subjected to a quality audit and aremembers of the QA+ Scheme can be used within aQA+ Guarantee installation. Any products used withinthe installation, which have not been audited orapproved, will invalidate the insurance cover.

6. Is the project quality audited and inspected?

YES. Every QA+ Guarantee project is monitored on aregular basis, not only to ensure full compliance butalso to assist the installers.

7 Is there a requirement to maintain the roof aftercompletion?

YES. The greatest single advantage to conducting roofinspections early and often is to identify problems, orpotential problems, at an early stage. Deficiencies indesign, materials and workmanship may not beobvious at the completion of a roofing project; it maytake a little time for such a deficiency to becomeapparent. Industry experience shows that the majorityof deficiencies will become evident within the first twoor three years.

The risk-reducing services of Alliance Warranty Management

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Comprehensive technical support

Decra, the UK and Ireland's leading

lightweight roofing system, is backed by

comprehensive technical support,

offering you expert advice and

information at every stage of a project –

from initial concept through to

completion and planned maintenance.

Technical literature

A full range of literature and associated

items regarding every aspect of the Decra

system, is available from Decra Technical

Services:

n Product information and technical data.

n Sample Decra tiles – to aid product

selection.

n WLC, LCA & environmental reports.

n CAD drawings.

n Project specific specification writing.

n Decra Technical Services online containing

CAD drawings library and technical

information.

Nationwide support team

Decra has a nationwide team of technical

experts on hand to provide advice in your

office or on site. For local technical support

for your current project and any future

requirements, we can arrange for one of our

technical advisers to contact you.

CPD

Decra fully supports CPD. Regular Decra

CPD seminars are arranged for all

construction professionals. To arrange a

seminar, contact the Technical Services

Department.

Decra training

A successful roof is only possible when it is

fitted by skilled, trained operatives. That is

why Decra invests in training.

At our purpose built training centre at Decra

Headquarters in Crawley we offer courses

throughout the year both for newcomers to

the Decra system and for those wishing to

‘refresh’ their skills. With roof assemblies just

a few feet off the ground, training can be

given safely at all times, whatever the

weather.

Following a recent audit carried out by

Carrillion we have implemented a structured

training plan, featuring a syllabus that

provides a mechanism for continuous

improvement and improved quality of

workmanship.

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Design development

The training centre also acts as a design

facility, enabling us to first engineer

theoretical solutions to problems and then

develop them into real world, constructional

mock-ups. This gives designers far greater

assurance than computer modelling ever

can.

Working closely with designers and

contractors, our aim is always to provide

solutions that maintain the designer’s

freedom and ability to be innovative, and

help installers put the design into practice

soundly and efficiently.

Visit Decra

Decra has a completely open door policy.

Visitors are always welcome at our

headquarters and warehouse in Crawley,

announced or unannounced, during our

normal working hours of 8.30 am to 5.15

pm, Monday to Friday.

Ordering and delivery

All Decra roofing materials are available

directly from Decra. To order, simply contact

our dedicated sales office.

With our investment in high stock levels,

almost all orders can be supplied directly

from the warehouse. This enables us to

provide a maximum delivery time of 4

working days; 2 working days is typical.

Orders can be collected with 4 working

hours notice. Our call and collect service is

open from Monday to Friday

8.30am – 5.00pm.

DecraDirectDecraDirect is our online information

resource centre for the Decra Roofing

System. DecraDirect is available from

the Decra website at www.decra.co.uk

and gives you access to:

n A comprehensive library of CAD

drawings for the complete range of

Decra Roof System tiles and

accessories. The drawings are available

for download in the following formats:

n AutoCad DWG.

n DXF.

n MiniCad version 7 MCD.

n As Acrobat files.

n Decra technical information library,

including information on:

n Tile properties and performance.

n External testing and independent

certification of the Decra Roof System.

n Decra project specification services.

n Standard NBS clauses.

n CDM regulations.

n New products.

n Your local Decra Technical Adviser

(with contact details).

n Members of the Decra Contractor

Partner Scheme.

Decra Sales and Technical Services

Prompt assistance for all technical enquiries:

Telephone: 01293 545058

Fax: 01293 562709

Email: [email protected]


Web: www.decra.co.uk

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Decra product guarantee

Understanding roofing product

guarantees is no fun! We’re well aware

of the sheer volume of claims from

different manufacturers and

distributors … with no real back-up to

suggest that you can believe in one

product more than any other.

At Decra we feel we have a

responsibility to lay our cards on the

table, tell you what is genuinely

covered, and demonstrate our

commitment to fulfilling our promise. If

you have a question regarding our

guarantee that remains unanswered

after reading the following details,

please call our Technical Support Team

on 01293 545058.

Guaranteed against weather for

30 years

Decra is strongly committed to providing the

highest quality products in the industry and

stand firmly by our guarantee that when

Decra roof tiles have been fitted:

a) The entire roof will remain weatherproof

for 30 years;

b) Any defects due to faulty workmanship

arising in the roof within the first 2 years

will be resolved.

strength and since 1998 we have been

backed by Icopal, a £250,000,000

organisation.

What happens if the company

goes bust?

This is a very good question as a number of

roofing product manufacturers have done

just that several times over the last 10 years,

each time waiving any liability from the

previous company.

Decra Roof Systems Ltd has operated as

one entity in the UK and Ireland since 1977.

Financially it has gone from strength to

strength and since 1998 we have been

backed by Icopal, a £250,000,000

organisation.

What about damage from extreme

weather conditions?

Another good question as a number of

manufacturers will not pay out when

damage is done by extreme weather

conditions such as those we all experienced

in October 1987. Not so for Decra … if our

roof tiles fail to be weatherproof over the

next 30 years, we will replace them.

Does it really cover the whole roof?

Yes! Once again some roofing guarantees

will only cover the individual tiles

conveniently excluding all the vulnerable

edges of the roofs rather than the whole roof

tile system. Technical Manager, Mark Bell,

with 16 years service, says he doesn’t ever

remember Decra tiles being ordered for

storm damage repair work on roofs fitted by

Decra. But if a claim does come in, we’re

willing and ready to fulfil our guarantee.

How can Decra make such bold

guarantees?

Because the product and manufacturing

processes really are that good! And there

have been great advancements in

technology that have consistently made our

tiles better and better.

Back in the 1970’s Decra’s tiles were much

more low tech than today, just basic zinc

galvanising with an additional bitumen and

stone coating system applied, these tiles

have proven themselves to be weather

secure for almost 30 years and are still

going strong.

Today’s Decra tiles comprising of state of

the art zinc aluminium galvanising

encapsulated within multi-layer epoxy,

polyester, acrylic and stone coatings are in

altogether another league. For example, the

current galvanising system has been

independently tested and proven to have a

protective life-span of 2 to 4 times greater

than before.

Mark Bell says “It would take a corrosive

environment for our tiles not to last at least

60 years”.

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Terms and conditions of Decra Roof SystemsGuarantee

1. Decra Roof Systems expressly guarantees thateach Decra Tile and tile accessory included in theroof and fitted in accordance with the Decra RoofSystems installation instructions and normalstandards of good workmanship, will remainweatherproof for not less than thirty years from thedate of installation. In the event of a claim under thisguarantee, the obligations of Decra Roof Systemsshall be limited solely to the supply only ofreplacement products or of the nearest availablesubstitute at the time of any claim.

2. The installation contractor named on theguarantee warrants that defects in the roof fitted tothe above property arising within two years of thedate of installation and caused by faultyworkmanship when fitting the roof shall within areasonable time be made good without cost to theowner.

3. The guarantee shall not apply where the damageor deterioration complained of is not attributablesolely, in the case of the tile and tile accessoryguarantee, to any defect in the products as supplied,or in the case of the workmanship guarantee, in thefitting of the roof.

4. Neither Decra Roof Systems nor the installationcontractor shall, by virtue of their respectiveguarantee, be liable for any consequential, indirect orspecial loss or damage of any kind whatsoever,including, but not limited to, damage caused byleaks.

5. The guarantee shall not apply unless payment hasbeen made in full for the supply and fitting of the roofand the benefits conferred by the guarantee shall notaffect the consumer’s statutory rights.

6. Decra Roof Systems and the installationcontractor must be promptly notified of anydeterioration or other defects in the tiles or roofgiving rise to a claim under the guarantee. Anyclaims must be forwarded, in the first instance toDecra Roof Systems and must be received withinone year from expiry of the guarantee under whichany such claim is made.

7. Any replacement products supplied will becovered under the guarantee for the period of time, ifany, remaining unexpired at the time of their supply.

8. The guarantee only applies when the tiles havebeen installed within the United Kingdom or Republicof Ireland.

9. The guarantee shall not apply where any damageor deterioration is due to accident, fire, abnormalatmospheric pollution, war or act of war, civilcommotion or act of God and, in the case of the tileand accessory guarantee, to incorrect handling orinstallation or use for a purpose for which they werenot designed or not recommended by Decra RoofSystems.

As Decra’s that good why don’t you

guarantee it for even longer?

Because we are here for the long run, it’s

easy to start a new business and offer

fantastic guarantees. Over the years we

have seen direct competitors come and go

leaving a trail of worthless guarantees and

disappointed customers behind them. Bold

claims are easily made when you have no

eye on the future.

We are by nature prudent in our approach,

its why we’re still here after nearly 30 years,

it’s why our parent company has been

trading for over 100 years and its why you

can trust us. Your roof is one of the most

expensive investments you will make and

it’s the investment that probably shelters

everything else you own. Why gamble?

What happens if the property changes

hands?

A good question, but not one to get excited

about as we place the guarantee on the

property rather than the owner. In this way

we protect your property today and add

value to your property should you choose

to sell it tomorrow.

But will Decra actually pay out when it

comes to the crunch?

Yes! Take a look at the graph on page 69.

It illustrates the percentage of our tiles that

have been found to be defective and

replaced between 1977 and the end of

2003.

And better still, we have never received a

claim for weatherproof failure in any

properly constructed roof with correctly

installed Decra roof tiles.

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Decra service promise

At Decra, we are committed to providing

you with a service that is second to

none. The following service guarantees

are the result of a company-wide

initiative and reflect our determination to

make your dealings with us a pleasure.

Our aim is to provide this level of service

during all our working hours – Monday to

Friday 8.30am to 5.15 pm. If you can think of

additional issues that would help you even

more, please speak to any member of the

service team at Decra - Tel: 01293 545058.

When you contact usWe guarantee that…

n We will answer all telephone calls within

5 rings.

n We will not transfer you more than once

unless absolutely necessary.

n You will always get a real person, not a

recorded message.

n You will not be asked to leave a voicemail

message.

n You will not be speaking to a call centre.

n If all of our Sales Support and Technical

Support team are engaged, we promise to

call you back within 2 hours at the very

most.

n We will respond to all written enquiries

within two working days.

n Your name and address will never be sold

on to a 3rd party. Your details

are confidential.

When you require assistanceWe guarantee that…

n We will provide you with access to a library

of easy-to-understand technical

documentation, relevant codes of practice

and British Standards.

n We will provide you with a FREE materials

estimating service.

n All estimates will be produced within one

full working day.

n All estimates will not change in price for 6

months.

n Everyone in technical support roles has

both technical experience and ongoing

relevant CPD training to advise you

correctly.

n If you require local technical support it will

be provided on your doorstep within 2

working days by one of our directly

employed, local technical support team.

n We will give you assistance in dealing with

Planning Departments through a local

Decra Technical Advisor.

n When you contact us for a full roofing

survey, we will come back to you within

1 working day to organise a date for

Decra’s trained site survey team to carry

it out.

A comprehensive specification report will

then be drawn up to provide solutions that

are necessary for a trouble-free roof.

n We will provide training and instruction.

When you place an orderwith usWe guarantee that…

n With nearly 30 years of experience behind

us, we will provide a service that is second

to none.

n With our investment in a high level of

stocks we offer 100% availability for 98%

of orders.

n You will have a maximum delivery time of 4

clear working days; 2 working days is

typical.

n Your delivery will arrive in the morning or

the afternoon, as agreed, of the day

specified.

n You can collect from Decra with four

working hours notice.

n All orders are double checked by a second

member of Decra’s staff before being

dispatched to you.

n In the unlikely event that we make a

mistake with your order, we will pay

reasonable costs to rectify the situation.

n You can choose from a wide range of

payment options, including credit card,

BACS, electronic transfer, cheque and

banker’s draft. If you wish to pay by a

method not mentioned here, please ask.

And once you’ve takendeliveryn If you have any queries about your new

roof, please call our After Sales Service

Team on 0845 1304601 (local call rate

from any part of the UK).

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IF YOU ARE HAPPY

WITH OUR SERVICE -

TELL SOMEONE ELSE

ABOUT IT.

IF YOU ARE NOT

HAPPY WITH OUR

SERVICE - TELL ME!

IAN A MCBAIN

GENERAL MANAGER,

TEL: 01293 545058

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For all climates and conditions

The Decra roofing system is traditional

in appearance, but unburdened by

traditional limitations. The system may

be confidently specified for even the

most exposed weather conditions and

will provide guaranteed, long term

performance.

Exceptional weather resistance

Unlike traditional roof tiles, the Decra system

places no reliance on dead weight to

provide resistance against wind uplift. Decra

roof tiles are secured through both top and

bottom edges into battens. This lateral

positioning of the fixings means that all loads

on these fixings are at 90° to their plane.

Whatever the roof pitch, from 10° to 90°,

Decra tiles provide the highest resistance to

wind uplift, and will shrug off even the worst

of the weather, including gale force winds

with driving rain.

Proven worldwide

The Decra system has been installed in all

climates and areas of the world, from the

high Himalayas to the Arctic circle, from the

heat of the Equator to the gales and driving

rain of the Shetland Isles. In all cases, Decra

has provided a lasting solution, resistant to

tornadoes, monsoons, blizzards and

hurricanes.

Security for the future

Due to climate change, wind loadings in the

UK and Ireland are expected to increase by

5-10%. A BRE Report suggests that, unless

changes are made, additional costs in the

region of £1-2 billion a year could be

incurred in repairs to damaged roof

coverings and fixings.

n “The average insurance claim for wind

damage is £1,000 - £2,000.”

n “Every year in the UK an average of

200,000 buildings are damaged by high

winds at a cost of £35.5 million.”

n “Further climate change effects are also

likely to increase maintenance costs for

roofs by £2.5 billion a year.”*

*Sources: BRE, “Potential implications of climate change inthe built environment” 2000. BRE “Gale damage to buildingin the UK – an illustrated review”.

In a survey of roofing contractors carried out

by Eternit Slates (Marley Group) in the

aftermath of storms;

n Nearly 60 per cent reported damage to

tiled roofs.

n Over 40 per cent reported damage to

slated roofs.

n 66 per cent reported that work was

required on roofs over 20 years old.

n 33 per cent reported that work was

required on roofs younger than 20 years.

Source: “Roofs to weather all storms” by Eternit Slates,Marley Group. (Extract from Refurbishment Projects,August 2003).

With a Decra roof, no action or adaptation is

required to combat the effects of climate

change. The system has already been

extensively proven in climates far harsher

than any likely to be experienced in the UK

and Ireland.

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Aesthetically pleasing

The attractive, traditional appearance of

Decra tiles ensures they are suitable for any

environment – urban or rural, traditional or

modern, however planning sensitive the

area is.

Decra tiles closely echo the appearance of

traditional clay tiles. The granular surface of

the tiles gently diffuses light to bring a soft

natural appearance that integrates perfectly

with surrounding buildings and harmonises

with the landscape.

Environmentally sensitive

The original shingle roof on St Patrick’s

Church in Claudy, Northern Ireland had

proved expensive to maintain over the years,

and was fast approaching the end of its life.

In co-operation with the architects, Decra

carried out a thorough site survey and drew

up a full specification, including the complex

detailing around and under the lantern

beneath the spire.

The refurbishment left the original roof in

place. Over it, the contractor installed

counter battens, insulation (there had been

none before) and underlay, before fixing the

new Decra tiles.

The charcoal grey colour of the tiles is ideal

for this rural area, and no additional structure

was required: The total weight of almost

900 m2 of Decra Stratos tiles amounted to

less than 6.5 tonnes, compared with nearly

45 tonnes for concrete tiles.

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The right choice for housebuilding

Decra tiles have been tried and tested

on all types of housing development

and apartment buildings throughout the

UK and Ireland and in many countries

across the globe.

Security of supply

Large volume orders are never a problem –

Decra carries in stock enough tiles and

accessories to roof around 2,250 average

terraced houses. Two large manufacturing

plants in Europe further ensure availability of

Decra tiles - when and where housebuilders

require them. Delivered on site, on time, and

in the right quantities, typically within 2

working days.

Partnering

Decra has pioneered partnering

agreements. We offer our construction and

development partners unrivalled efficiency in

supply chain management as well as in

depth technical and design support – saving

costs and helping to keep the build

programme on schedule. Whilst working

with Wimpey and the Guinness Trust our

delivery promptness and partnering

approach resulted in the client’s total

satisfaction with our service.

Off site, fast-track construction

The light weight and dry fixing attributes of

the Decra system makes it ideal for system

building. The entire roof can be constructed

off site in large interlocking modules, and

then craned into position. This dramatically

reduces construction time on site and the

possibility of delays due to inclement

weather or programming difficulties.

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Reduced costs

The range of pre-formed details and use of

fewer fixings speeds installation and thereby

reduces on-site costs.

Costs are further reduced by the savings

possible on structure. The light weight of

Decra tiles enables close space reduction in

the dead load of the roof, enabling significant

savings in the size and cost of structural

materials, for example; timber trusses.

The volumetric efficiency of Decra tiles means

on-site storage is rarely a problem, even in

constricted urban conditions.

Design flexibility

Easy cutting and shaping of the tiles means

no problems on site, even with the intricate

detailing of dormer windows. Decra tiles are

also suitable for vertical tiling, providing an

extremely robust finish that will not slip, crack

or fracture, all but eliminating any of the

traditional maintenance problems.

Reduced construction times.

Good track record in supply

chain partnerships.

Large stocks instantly

available.

Full local technical support.

Ideal for both traditional

construction and off-site

modular construction.

With over 10 million square

metres already installed,

Decra has a high degree of

planner acceptability.

Reduced environmental

impact.

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The right choice for local authority,housing association and public buildings

Decra’s lightweight roofing system

provides the ideal solution for all types

of Local Authority, Government

buildings and Housing Association

homes, including:

n Social Housing.

n Schools.

n Hospitals.

n Health Centres.

n Prisons and Secure Establishments.

n Key Worker Housing.

n PFI/PPP Projects.

Decra offers a full roof design and estimating

service to support the building management

and construction teams, as well as a

comprehensive site survey and report for

refurbishment schemes.

Vandal proof

Decra tiles are strong enough to stand up to

foot traffic, and are highly resistant to impact

damage from thrown or dropped objects. In

addition, the large format with fixings at top

and bottom mean Decra tiles are extremely

difficult to remove.

For ultimate security, Decra Plus tiles have a

core of 0.9mm galvanised steel, twice the

thickness of Decra Classic, and provide

exceptional strength and resistance to

damage. They are arguably the toughest

tiles available, yet weigh less than 12kg

per m2.

Low maintenance, low lifetime costing

The strength and durability of Decra tiles,

backed by Decra’s 30 year weather security

guarantee, ensures very low lifetime costs

for the roof. Decra Roof Systems greatly

reduce maintenance costs. This enables

budgets to be used in more constructive

ways.

Light weight

Light weight and easy to handle and fix,

Decra tiles are ideal for flat to pitched roof

conversions and refurbishment projects.

Often no additional strengthening of the

structure is required to support the Decra

Roofing System, as it is lightweight. Intricate

detailing and installation on roofs even many

storeys above ground, may be achieved

quickly and cost effectively, reducing future

maintenance requirements and enhancing

the appearance of the building.

On time, just in time

The efficiency of Decra’s supply chain

management is such that ‘just in time’

deliveries can be guaranteed to meet

precise slots within the build programme.

This is particularly useful for urban projects

and refurbishment of occupied buildings:

n Reliable programming, avoidance of

delays.

n Reduced site storage requirements.

n Reduced vulnerability to theft.

n Faster, more cost efficient project

completion.

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Local technical support.

Full specification service, via

Decra total project package and

Decra integrated teamwork

service.

Comprehensive aftercare services

and insurance backed guarantee

available.

Reduced environmental impact.

30 year guarantee backed by

a 30 year excellent track record.

Virtually maintenance free.

Vandal proof.


metres already installed, Decra

has a high degree of planner

acceptability.

BBA Certified.

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The right choice for retail development

Decra is fast becoming the preferred

roof tile supplier of major retailers and

developers. The system combines a

pleasing, welcoming appearance with

fast-track construction.

Long lasting, low maintenance

A Decra roof has enhanced colour stability -

which does not fade or deteriorate with UV

light - possesses the ultimate in weather

security, and consequently requires virtually

no maintenance. The high strength of Decra

tiles dramatically improves impact and

vandal resistance. Any risk of break-in

through the roof is negligible.

Fast track construction

As a completely dry-fixed roof, requiring far

fewer fixings than standard tiled roofs, the

Decra system is ideal for use with fast-track

construction programmes used by

organisations such as ASDA. Highly efficient

supply chain management and the

company’s policy of keeping large stocks

available, ensures fast and reliable delivery to

site, when and wherever required.

The speed of installation of a Decra roof

means the building can be made weather

tight more quickly than with conventional

materials, and hence enables following

trades to be on-site earlier in the

programme. Use of a Decra roof provides a

very real opportunity of opening the store

sooner than if conventional tiling is used.

The range of warm roof insulated tile

support systems also facilitates and speeds

up construction.

Attractive and cost effective

The traditional appearance and light weight

of Decra tiles offers an attractive alternative

to profile metal sheeting - and reduces risk

of planning delays.

The Decra system does not give rise to

costly additional structural requirements. By

contrast, using standard slates or clay tiles

can push construction costs up by 30-50%.

Optimum size

Decra tiles are light and are easy to handle

on site – even on blustery days. Conversely,

use of larger sheeted systems may require

installation to be halted when there’s a wind.

Large roofing sheets can also exaggerate

small dimensional discrepancies, creating

coverage and fixing problems at the edges

of the building consequently causing delays

in the construction programme.

Use of large roofing sheets can mean the

roof space is open to the elements if any

remedial work is required – requiring the

store to be closed. In the unlikely event of

repairs to Decra tiles being required, this

work can be achieved simply and quickly,

with no disruption to trading.

Vertical tiling

Vertical tiling constructed with traditional tiles

or slates can be subject to breakage,

slippage and vandalism and give rise to

public liability injury claims from tiles that

drop. Decra tiles, securely fixed to wall

battens, are shatterproof and cannot

normally be removed. Providing a safe and

aesthetic wall finish that you can rely on.

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Reduced construction times.

Good track record in supply chain

partnerships.

Large stocks instantly available.

Full local technical support.

Comprehensive aftercare services

and insurance backed guarantee

available.

No cyclical maintenance required.

High security of fastening system,

offers an opportunity to reduce

public liability claims.

Vandal proof.


metres already installed, Decra

has a high degree of planner

acceptability.

Reduced environmental impact.

Planning liaison service.3

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Low pitch solutionThe 17.5° roof pitch of St Ibers Primary

School in Castlebridge, Co. Wexford posed a

problem – or at least it had for the previous

man-made slate roof covering. This had

leaked, practically from the day it was

installed, and the school and Local Authority

sought a remedy.

The solution was Decra, and under the

instructions of David McHugh Architects,

Geoff Developments stripped the old roof

covering and installed just over 900m2 of

Decra Stratos tiles.

Weatherproofdetailing Decra Stratos not only provides weathertight

performance at low pitch, but the riven

surface of Decra Stratos delivers a finished

appearance very close to that of natural

slates. The completely dry-fixed Decra

Stratos tile is nailed at the top and bottom of

each tile. This secure fixing provides very

high resistance to wind uplift, even on roof

pitches as low as 12°.

Secure protection of the monopitch ridges is

provided by Decra Stratos Ridge Caps. Hip

Caps and Barge Covers maintain the

integrity of the roof at gable ends and

verges. As no mortar is used, there are no

maintenance concerns regarding mortar

failure.

Colour contrastAt St Ibers the architects specified charcoal

grey Stratos tiles. The roof provides an

effective, solid background which

complements the strong red and white used

for the other elements of the building

envelope.

Stratos roof tiles and accessories are also

available in Pepperstone, enabling hips and

ridges to be detailed in a contrast colour

where required.

Vertical tilingDecra tiles are ideal for vertical applications

because, unlike traditional tiles or slates, they

are not susceptible to breakage, slippage or

vandalism. Securely fixed to wall battens,

they are shatterproof and cannot be

removed.

Safe installationDecra tiles are easy to cut and shape

accurately using a guillotine or snips. This

enables simple and neat installation at raking

abutments. It also avoids the disruptive noise

and dust - and associated health risks -

created by angle grinders or similar

mechanical cutters. This was of great benefit

at St Ibers where part of the roof installation

was undertaken when the children were at

school.

Case study – Decra Stratos

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When the existing roof covering of

man-made slates at Pond Park Primary

School needed refurbishment, the South

Eastern Education and Library Board in

Northern Ireland decided to install Decra

Stratos tiles in charcoal grey.

Pond Park is not the first project for which

the South Eastern Education and Library

Board has specified Decra tiles, which have

found favour with the Board due to their

cost-effectiveness and ease of installation.

Long lastingperformanceDecra tiles have a core of zinc aluminium

galvanised steel, multi-layered protective

coating and ceramically glazed stone

granular finish. This construction, using the

latest technology, has proven exceptionally

durable in all climates and weather

conditions. Correctly installed, the entire roof

is guaranteed weatherproof for 30 years

– providing peace of mind for both the

owners and occupants of the building,

as well as avoiding the burden of ongoing

large maintenance costs.

Reliable ventilationAt Pond Park, 2200m2 of Decra Stratos tiles

were installed, together with integral eaves,

ridge and hip ventilation units. These units

provide reliable levels of ventilation to

prevent the formation of condensation and

consequent damage to the roof structure.

Decra ventilation units are available to suit

roofs with insulation at ceiling joist or rafter

level, in various sizes to meet the relevant

Building Regulation requirements

Ease of installationBecause the Decra roof finish is completely

dry-fixed, there were no delays due to

inclement weather. And without the noise

and dust of angle grinders, the project was

completed with minimum inconvenience to

ongoing activities at the school. Decra’s

local area representative was on hand at

design stage and on site to provide

assistance whenever required.

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Pond Park Primary School re-covered

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Moat Housing Group, in partnership with

Ashford Borough Council and The Housing

Corporation, has produced a splendid

example of sustainable, ecologically sound

housing.

The site of the 14 houses and six one-

bedroom flats is at Wilesborough Lees, a

semi-rural location on the outskirts of

Ashford in Kent. It boasts a Grade II smock

windmill built in 1869 that is one of the

largest in the south of England. It was,

therefore, of particular importance in the

planning brief that the development

preserved the outlook from the windmill.

Accordingly, the new homes, clad in

sparkling white timber and with roof tiles very

similar in appearance to the clay peg tiles

traditionally used throughout Kent, cluster

round the windmill as if they were always

meant to be there.

Off-sitemanufactureMoat Housing actively encourages off-site

manufacture, so the homes were of timber

frame construction with a large closed panel

system. They arrived by sea from the

manufacturer in Sweden, Karlson

Husindustrier, and then by truck to Ashford

calling for far fewer deliveries than

conventional housing would have needed.

Within six hours of delivery, the outer walls of

each pair of semi-detached houses were in

place, within a week they were erected and

a guaranteed watertight, tiled roof installed.

Design that saves timber is an important part

of the environmental and sustainability

strategy set out for social housing. With less

timber used throughout, including the rafters,

the only roof covering possible was

lightweight tiles, which also produced

savings in whole life costs compared with

concrete or clay.

Roof design anddetailingDecra worked with the designers and

contractors on the optimum use of the

specified Oberon tiles in Bark, assisted in the

ridge and barge detailing and investigated

the potential for fitting solar panels.

The rafter design was also checked out to

ensure that the battens were installed at the

optimum gauge to minimise waste, which

was a bigger issue than ever on an

environmentally sensitive site such as this.

Full training was provided for all the roof

operatives.

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Environmentally sensitive social housing

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Whilst the houses in Roedean Drive,

Romford look traditional, this innovative

development represents an entirely new,

groundbreaking approach to housebuilding.

They follow the successful pilot project in

[John Prescott’s constituency] in which a pair

of semi-detached houses were built off-site

as interlocking modules in only three weeks,

and assembled on site in just five days – the

UK’s first factory-finished volumetric

two-storey semi’s.

The roof consisted of ready-made panels up

to 6m long and 2.9m wide, comprising

175mm cold rolled steel channel topped by

120mm Glascofoam polyurethane insulation,

timber battens and counterbattens, sarking

felt and Decra Roof tiles.

This warm roof construction created an

unobstructed roof space – and the

opportunity for tenants to convert this into an

extra room.

The Egan agendaThe development at Roedean Drive was a

joint venture between The Guinness Trust,

George Wimpey and Britspace Modular

Building Systems. It provides 23 houses plus

one block of flats for social landlord the

Guinness Trust.

This linkage between housebuilder, building

manufacturer and housing association, as

well as the modular form of construction,

meets the Egan agenda, as set out in

‘Re-thinking Construction’.

Most importantly, the development also goes

a long way towards the ‘zero defects’ criteria

of the Egan Report. There were no snagging

problems and an exceptional finish was

achieved due to construction in factory

conditions.

Decra leadingtechnologyDecra Roof Systems played a key role in the

development of the modular roof system,

providing the technical and design input for

the roof construction that enabled the

original ‘proof of principle’ modular

development to be achieved.

Similarly, at only a seventh of the weight of

concrete tiles, Decra tiles were vital for the

viability of off-site roof construction.

At Roedean Drive, Decra Classic tiles in

terracotta were selected for six pairs of

houses and one detached house. Decra

Stratos in charcoal grey were chosen for

another five pairs of semi’s.

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Modular innovation

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Product guide

A comprehensive range of

roof tile systems and

accessories to meet all

requirements

Page

Product and accessories selector 33

Tile systems

Decra Classic 34

Accessories 36

Decra Plus Tile 38

Accessories 40

Decra Stratos 42

Accessories 44

Decra Oberon 46

Accessories 49

Parctile 50

Accessories 52

Decra Elegance 54

Accessories 56

Roofing Accessories

Decravent ventilation systems 58

Underlays and membranes 60

Eaves protection systems 62

Warm roof insulated tile support system 63

Icopal Rainwater System 64

Tools 66


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Product and accessories selector

Pitch – min./max Size of tile – cover Weight – per m2

Decra Classic 10-90º 1260 x 370 mm 6.56 kg

Decra Plus Tile 10-90º 1260 x 368 mm 11.65 kg

Decra Stratos 12-90º 1230 x 320 mm 7.1 kg

Decra Oberon 15-90º 1250 x 320 mm 7.0 kg

Parctile 12-90º 1250 x 370 mm 5.98 kg

Decra Elegance 10-90º 1260 x 370 mm 5.47 kg

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Decra Classic

Decra Classic tiles are designed to closely emulate the appearance of traditional clay pantiles.

The granular surface of the tilesgently diffuses light to create a soft, natural tone.

Colours

(Colours illustrated available from stock,

others to order)

NOTE: Colour reproduction is as close as the limitations ofthe printing process allows. Please use a colour sample,available free from Technical Services, for selectionpurposes

Terracotta Red Charcoal Grey Fern Green Teak Brindle

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Pitch

Minimum pitch 10°

Maximum pitch 90°

Dimensions

Size of tile - overall 1324mm x 410mm

Size of tile - cover 1260mm x 370mm

Gauge 370mm

Linear cover width 1260mm

Coverage 0.46m2 per tile

2.145 tiles per m2

Weight

Weight per m2 6.56kg

Weight per tile 3.06kg

Fixing

Tile fixing 50mm x 2.5mm Coated Decra nail[Available for loose hand nailing or collated forDecra Power Nailing System]

Fixings per tile 4-no.

Battens required

Battens 2.7 linear metres per m2 (plus wastage)

Batten sizing

Rafter Batten size

centres (max.) (recommended)

450mm 38mm x 25mm

600mm 50mm x 25mm

900mm 50mm x 50mm

1200mm 50mm x 50mm

1500mm 50mm x 65mm

Laying (recommended)

Simple roof shapes Straight bond

Complex roof shapes Broken bond

Ordering

Order code DT_B1

Accessories See Page

Tile accessories 36

Ventilation 58

Underlays, membranes 60

Eaves Protection 62

Tools 66

Data file

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D Ridge

Traditional angle shape

D ridge for use at

ridges and hips.

Cover: 1200mm

Order Code: DD_B1

D Ridge End Closure Unit

For use at intersection

of D Ridge with Decra

bargecover. Simplifies

installation and improves

consistency of finish.

Cover: 125mm

Order Code: DD_DE1

D Ridge Hip End Closure Unit

For use at the foot of

hips. Simplifies

installation and

improves consistency

of finish.

Cover: 1200mm

Order Code: DD_DH1

B Ridge

For use on ridges and

hips. NOTE: Ridge

Ventilation Units cannot

be used with this

component.

Cover: 1200mm

Order Code: DB_B1

Cloaked Verge Cap – Left Hand

For use at

gables/verges/barges.

Cover: 370mm

Order Code: DH_B2

Cloaked Verge Cap – Right Hand

For use at


Cover: 370mm

Order Code: DI_B2

Barge Cover – Left Hand

For use at gables/

verges/barges.

Cover: 1110mm

Order Code: DH_B1

Barge Cover Eaves Closure – Left Hand

For use at foot / base of gable. Simplifies



Cover: 1110mm

Order Code: DH_DE1

Barge Cover – Right Hand

For use at gables/

verges/barges.

Cover: 1110mm

Order Code: DI_B1

Barge Cover Eaves Closure

– Right Hand

For use at foot/base of

gable. Simplifies



Cover: 1110mm

Order Code: DI_DE1

Side Flashing – Left Hand

For use at sloping

abutment walls.

Cover: 1110mm

Order Code: DS_B1

Side Flashing – Right Hand

For use at sloping

abutment walls.

Cover: 1110mm

Order Code: DR_B1

Top Course

Cover: 1200mm

Order Code: DC_B1

Vision Tile

Decra Classic profile

only. Single skin

polycarbonate tile.

Cover: 1260mm x 370mm

Order Code: DZXB1

Finishing Kit

Touch up kit for vertically driven nails

(occurs at eaves and gable ends only).

Recommend 1 kit per 350 tiles ordered

Order Code: DU_B1

Decra Warm Roof Eaves Closure Unit

Designed for

use on warm

roof applications. Provides

an attractive finish for

eaves detailing. When

used in warm roof situations, must be used

in conjunction with Decra Warm Roof Eaves

Guard and Decra Warm Roof Eaves Closure

Flashing.

Available in Charcoal Grey only

Cover: 1200mm

Order Code: DM_B1

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Decra Classic accessoriesStock Items

Non-Stock ItemsAllow 6 weeks delivery, except for Teak

finish – allow 8 weeks.

Decra Flat Sheet

Available in Terracotta,

Charcoal, Fern Green, Brindle,

Pepperstone, Teak.

Dimensions: 1280mm x

905mm

Order Code: DQ_D1

Decra XL Ridge


Charcoal, Fern Green,

Brindle, Pepperstone,

Teak.

Cover: 1200mm; 180mm wings

Order Code: DD_DX

Decra Eaves Closure

Designed for use on over-

felt pitched re-roofing

applications. Provides an

attractive finish for eaves

detailing.

Available in Terracotta, Charcoal, Fern

Green, Brindle, Pepperstone, Teak.

Cover: 950mm

Order Code: DM_D2

Decra Wall Abutment Flashing

Designed for use as an

apron flashing at top edges

of roof. Provides an

attractive alternative to

traditional lead flashing.



Cover: 950mm

Order Code: DA_D1

Decra Rooflight (4 module x 2 courses)

Decra Classic and Plus

tile profile only. Complete

with hinged translucent

single skin polycarbonate

rooflight/access hatch.

No additional flashings required to provide a

weather proof finish.



Cover: 645mm (left to right) x 740mm (up

slope), translucent opening 500mm x

500mm

Order Code: DL_D1

Decra Roofhatch (4 module x 2 courses)


tile profile only.

Complete with hinged

granular finished

access hatch. No

additional flashings required to provide a

weather proof finish.





500mm

Order Code: DK_D1

For ventilation components

see Page 58

For tools see Page 66

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Recommend 1 pack per 420 tiles ordered.

Order Code: DNXB5

Decra Power Tile Fixing Nails

For Paslode cordless nail gun. Each pack

sufficient to install up to 550 Decra Classic

tiles. IMPORTANT NOTE: Use ONLY Decra

Power Tile Fixing Nails, never use Paslode

nails to fix Decra tiles.

Order Code: DNXP7


see Page 58


Decra Plus Tile

Decra Plus Tiles have an 0.9mmgalvanised steel core to provide theultimate in vandal resistance. Theseexceptionally strong tiles have the sametraditional shape as Decra Classic, with a granularsurface finish which provides an attractive roofscape.

Colours


others to order)

NOTE: Colour reproduction is as close as the limitationsof the printing process allows. Please use a coloursample, available free from Technical Services, forselection purposes

Terracotta Red Charcoal Grey

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Pitch

Minimum pitch 10°

Maximum pitch 90°

Dimensions



Gauge 368mm



2.157 tiles per m2

Weight



Fixing

Tile fixing 50mm x 2.99mm Coated Decra nailor Decra Plus fixing screws


Battens required

Battens 2.72 linear per m2 (plus wastage)

Batten sizing

Rafter Batten size


450mm 38mm x 25mm

600mm 50mm x 25mm

900mm 50mm x 50mm

1200mm 50mm x 50mm

1500mm 50mm x 65mm




Ordering

Order code PT_D1


Tile accessories 40

Ventilation 58


Eaves Protection 62

Tools 66

Data file

Decra Plus D Ridge

Traditional angle

shaped ridge for use

at ridges and hips.

Cover: 1200mm

Order Code: PD_D1

Decra Plus ‘D’ Box Barge Cap

For use at gable/verge

Simplifies installation and improves


Cover: 1200mm

Order Code: PH_D1

Decra Plus D Ridge/Hip Sealing Strip

Simplifies installation and improves


Cover: 12.5m (25 linear metres in a pack,

providing enough sealing strip to cover both

sides of a 12.5m long ridge or hip).

Order Code: PSXD1


Designed for

use on warm

roof applications.

Provides an attractive

finish for eaves detailing. When used in

warm roof situations, must be used in

conjunction with Decra Warm Roof Eaves


Flashing.

Available in Charcoal Grey only.

Available in 0.43mm gauge only.

Cover: 1200mm

Order Code: DM_B1

Finishing Kit



Recommend 1 kit per 350 tiles ordered.

Order Code: DU__B1

Decra Plus Fixing Nails (1.5kg pack)


Order Code: PNXD1

Decra Plus Fixing Screws


Available in red or black. Pack includes

6.3mm (1/4” internal fastening) hex head bit.

Order Code: PS_D1

Decra Plus Cutting Blade

For use with a reciprocating saw.

Order Code: PFSW2

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finish– allow 8 weeks.

Available in 0.43mm gauge only.

Decra Flat Sheet



Pepperstone, Teak.


905mm

Order Code: DQ_D1

Decra XL Ridge




Teak.


Order Code: DD_DX

Decra Eaves Closure

Designed for use on

over-felt pitched re-

roofing applications.


finish for eaves detailing.

Available in Terracotta, Charcoal, Fern Green,

Brindle, Pepperstone, Teak.

Cover: 950mm

Order Code: DM_D2



apron flashing at top

edges of roof. Provides

an attractive alternative

to traditional lead

flashing.



Cover: 950mm

Order Code: DA_D1

Decra Rooflight (4 module x 2 courses)


tile profile only.


translucent single skin

polycarbonate

rooflight/access hatch. No additional

flashings required to provide a weather proof

finish.





500mm

Order Code: DL_D1

Decra Roofhatch (4 module x 2 courses)

Decra Classic and

Plus tile profile only.


granular finished

access hatch. No additional flashings

required to provide a weather proof finish.





500mm

Order Code: DK_D1


see Page 58


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Decra Stratos

Decra Stratos Tiles have an attractive riven surface which provides anappearance similar to a slate roof. These high performance tiles providea smart roof finish, which is exceptionally robust and long lasting.

Use of contrasting colour ridge and hip covers lends a distinctive finishfor all types of building.

Colours


others to order)


Charcoal Grey Pepperstone

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Pitch

Minimum pitch 12°

Maximum pitch 90°

Dimensions



Gauge 320mm



2.54 tiles per m2

Weight



Fixing

Tile fixing 50mm x 2.5mm Coated Decra nail[Available for loose hand nailing or collated for Decra Power Nailing System]


Battens required


Batten sizing

Rafter Batten size


450mm 38mm x 38mm

600mm 50mm x 38mm

900mm 50mm x 50mm

1200mm 50mm x 50mm

1500mm 50mm x 65mm


All roof shapes Brokenbond

Ordering

Order code ST_B1


Tile accessories 44

Ventilation 58


Eaves Protection 62

Tools 66

Data file 43

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Decra Stratos accessoriesStock Items

D Ridge

Traditional angle

shaped ridge for use at

ridges and hips.

Cover: 1200mm

Order Code: DD_B1





installation and

improves consistency of finish.

Cover: 125mm

Order Code: DD_DE1



hips. Simplifies

installation and


of finish.

Cover: 1200mm

Order Code: DD_DH1


For use at gables/

verges/barges.

Cover: 1104mm

Order Code: SH_B1



gable. Simplifies



Cover: 1104mm

Order Code: SH_DE1


For use at gables/

verges/barges.

Cover: 1200mm

Order Code: SI_B1


– Right Hand


gable. Simplifies



Cover: 1200mm

Order Code: SI_DE1

Top Course

Cover: 1200mm

Order Code: DC_B1

Ridge/Barge Cap

For use at ridges, hips

and barges. For ridge or

hip ventilation system, use

ridge/barge in conjunction

with universal ridge/hip ventilation system.

Cover: 320mm

Order Code: SR_B1

End Cap

Filler for ridge/barge cap

ends only.

Order Code: SE_B1


Designed for

use on warm

roof applications.


finish for eaves detailing. When used in

warm roof situations, must be used in

conjunction with Decra Warm Roof Eaves


Flashing.


Cover: 1200mm

Order Code: DM_B1

Finishing Kit




Order Code: DU_B1

Fixing Nails (6kg pack)


Order Code: DNXB5



sufficient to install up to 550 Decra Stratos

tiles. IMPORTANT NOTE: Use ONLY Decra

Power Tile Fixing Nails, never use Paslode

nails to fix Decra tiles.

Order Code: DNXP7


see Page 58


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Allow 6 weeks delivery, except for Teak

finish– allow 8 weeks

Decra Flat Sheet

Available in Charcoal,

Pepperstone.


905mm

Order Code: DQ_D1

Decra XL Ridge

Available in Charcoal,

Pepperstone, Teak.

Cover: 1200mm;

180mm wings

Order Code: DD_DX

Decra Eaves Closure

Designed for use on

over-felt pitched re-

roofing applications.


finish for eaves detailing.



Cover: 950mm

Order Code: DM_D2




edges of roof. Provides

an attractive alternative

to traditional lead flashing.



Cover: 950mm

Order Code: DA_D1


see Page 58


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Decra Oberon

Attractive and extremely versatile DecraOberon, provides a traditional roof finish – but with the enhanced performance and light weight of Decra’s unique coated steel construction.Available in four subtly blended, natural colours, DecraOberon tiles weigh 90% less than clay tiles, yet cannot

be cracked, will not shatter fromimpact, or loosen with time.

Colours

(Available from stock)

NOTE: Colour reproduction is as close as the limitationsof the printing process allows. Please use a coloursample, available free from Technical Services, forselection purposes

Sunset Red Bark Ravine Eclipse

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Pitch

Minimum pitch 15°

Maximum pitch 90°

Dimensions



Gauge 320mm



2.50 tiles per m2

Weight



Fixing

Tile fixing 50mm x 2.5mm Coated Decra nail(Available for loose hand nailing or collated forDecra Power Nailing System)


Battens required


Batten sizing

Rafter Batten size


450mm 38mm x 25mm

600mm 50mm x 25mm

900mm 50mm x 50mm

1200mm 50mm x 50mm

1500mm 50mm x 65mm


All roof shapes Broken bond

Ordering

Order code BT_N1


Tile accessories 49

Ventilation 58


Eaves Protection 62

Tools 66

Data file

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Decra Oberon accessories

Ridge/Barge Cap

For use at ridges, hips

and barges. For ridge or

hip ventilation system,

use ridge/barge in

conjunction with

universal ridge/hip ventilation system.

Cover: 370mm

Order Code: BR_N1

End Cap

Filler for ridge/barge cap

ends only.

Order Code: BE_N1

Finishing Kit




Order Code: BU__N1



Order Code: DNXB5



sufficient to install up to 440 Decra Oberon.

IMPORTANT NOTE: Use ONLY Decra Power

Tile Fixing Nails, never use Paslode nails to

fix Decra tiles.

Order Code: DNXP7

Top Course

Cover: 1200mm

Order Code: BC_N1

Decra Warm Roof Eave Closure Unit

Designed for

use on warm



eaves detailing. When used in warm roof

situations, must be used in conjunction with

Decra Warm Roof Eaves Guard and Decra

Warm Roof Eaves Closure Flashing.


Cover: 1200mm

Order Code: DM_B1


see Page 58


Stock Items

Non-Stock ItemsAllow 6 weeks delivery.

Decra Flat Sheet

Available in Sunset Red, Bark, Ravine

and Eclipse.

Dimensions:

1280mm x 905mm

Order Code: BQ_N1

Parctile

A distinctive modern, angular design providing a smaller format tileparticularly suitable for modular buildings, domestic developments,park homes and similar applications.

Colours


others to order)


Terracotta Red Charcoal Grey Fern Green Teak

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Minimum pitch 12°

Maximum pitch 90°

Dimensions



Gauge 370mm



2.162 tiles per m2

Weight



Fixing

Tile fixing 50mm x 2.5mm Coated Decra nail(Available for loose hand nailing or collated forDecra Power Nailing System)


Battens required


Batten sizing

Rafter Batten size


450mm 38mm x 25mm

600mm 50mm x 25mm

900mm 50mm x 50mm

1200mm 50mm x 50mm

1500mm 50mm x 65mm




Ordering

Order code AT_B1


Tile accessories 52

Ventilation 58


Eaves Protection 62

Tools 66

Data file 51

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Parctile accessoriesStock Items

D Ridge

Traditional angle shape

d ridge for use at

ridges and hips.

Cover: 1200mm

Order Code: AD_B1







Cover: 125mm

Order Code: DD_DE1



hips. Simplifies

installation and


of finish.

Cover: 1200mm

Order Code: DD_DH1

B Ridge

For use on ridges and

hips. NOTE: Ridge

Ventilation Units cannot

be used with this

component.

Cover: 1200mm

Order Code: AB_B1


For use at gables/

verges/barges.

Cover: 1110mm

Order Code: AH_B1


For use at foot / base of

gable. Simplifies



Cover: 1110mm

Order Code: DH_DE1


For use at gables /

verges/barges.

Cover: 1110mm

Order Code: AI_B1


– Right Hand


gable. Simplifies



Cover: 1110mm

Order Code: DI_DE1

Side Flashing – Left Hand

For use at sloping

abutment walls.

Cover: 1110mm

Order Code: AS_B1

Side Flashing – Right Hand

For use at sloping

abutment walls.

Cover: 1110mm

Order Code: AR_B1

Top Course

Cover: 1200mm

Order Code: AC_B1

Finishing Kit




Order Code: AU_B1


Designed for

use on warm



eaves detailing. When used in warm roof

situations, must be used in conjunction with

Decra Warm Roof Eaves Guard and Decra



Cover: 1200mm

Order Code: DM_B1



Order Code: DNXB5



sufficient to install up to 550 Parctiles.

IMPORTANT NOTE: Use ONLY Decra Power

Tile Fixing Nails, never use Paslode nails to

fix Decra tiles.

Order Code: DNXP7


see Page 58


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finish– allow 8 weeks.

Decra Flat Sheet



Pepperstone, Teak.


905mm

Order Code: DQ_D1

Decra XL Ridge




Teak.


Order Code: DD_DX

Decra Eaves Closure

Designed for use on over-

felt pitched re-roofing

applications. Provides an

attractive finish for eaves

detailing.



Cover: 950mm

Order Code: DM_D2




edges of roof. Provides an

attractive alternative to

traditional lead flashing.



Cover: 950mm

Order Code: DA_D1


see Page 58


Decra Elegance

The Decra Elegance tiles smooth,high lustre finish provides a unique

opportunity to explore and exploit thepure fluid design integrity of steel.

Colours

(Available from stock)


Elegant Black

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Pitch

Minimum pitch 10°

Maximum pitch 90°

Dimensions



Gauge 370mm



2.145 tiles per m2

Weight



Fixing

Tile fixing 50mm x 2.5mm Coated Decra nailor Decra Plus fixing screws


Battens required

Battens 2.7 linear metres per m2 (plus wastage).

Battens sizing

Rafter Batten size


450mm 38mm x 25mm

600mm 50mm x 25mm

900mm 50mm x 50mm

1200mm 50mm x 50mm

1500mm 50mm x 65mm




Ordering

Order code ET_D1


Tile accessories 56

Ventilation 58


Eaves Protection 62

Tools 66

Data file 55

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Decra Elegance accessories

Cloaked Verge Cap – Left Hand

For use at


Cover: 370mm

Order Code: EH_B2

Cloaked Verge Cap – Right Hand

For use at


Cover: 370mm

Order Code: EI_B2

Decra Half Round Ridge

Suitable for roof pitches.

10° to 45°

Cover: 400mm

Order Code: EE_D1R

Decra Half Round Starter &

End Ridge Caps

Suitable for use with

Decra Half Round Ridge.

Sold as a pair (1 End & 1

Starter Cap).

Cover: 400mm

Order Code: EE_D1

Decra Half Round Hip End Ridge

Suitable for use with

Decra Half Round Ridge.

Cover: 400mm

Order Code: EE_D1H

Vision Tile

Decra Elegance profile only. Single skin

polycarbonate tile.

Cover: 1260mm x 370mm

Order Code: DZXB1

Finishing Kit




Order Code: EU_B1



Order Code: DNXB5


see Pages 58


Stock Items

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Decra Elegance Tile – NEW SATIN FINISH for late 2006

Threeelegantcolours in asoft, satinfinish thatreplicatesthe textureandappearanceof clay.Availablelate 2006.

Graphite

Mocca

Terracotta

Threeelegantcolours in asoft, satinfinish thatreplicatesthe textureandappearanceof clay.Availablelate 2006.

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DecraVent ventilation systems

Ventilation Tiles

For Decra Classicand Decra Plussystems:

Classic & Plus Tile In-line Air Vent

Provides 10,000m2 airflow.

Order Code: DVA_W1

Classic & Plus Tile In-Line Soil/Mech

Extract Vent

Includes adaptor and flexi-pipe.

Order Code: DVS_W1

For Decra Stratossystem:

Decra Stratos In-line Air Vent


Order Code: SVA_W1

Decra Stratos In-line Soil/Mech Extract

Vent


Order Code: SVS_W1

For Oberon system:

Oberon tile In-line Air Vent


Order Code: BVA_W1

Oberon tile In-line Soil/Mech Extract

Vent


Order Code: BVS_W1

For Parctile system:

Parctile Air Vent

Provides 10,000m2 airflow. Includes integral

adaptor.

Order Code: AVI_B1

Parctile Soil/Mech Extract Vent


Order Code: AVS_W1

For Elegancesystem:

Elegance Air Vent

Provides 10,000m2 airflow. Includes integral

adaptor.

Order Code: EVA_W1

Elegance Soil/Mech Extract Vent


Order Code: EVS_W1

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Ridge & Hipventilation

Universal D Ridge/Hip Ventilator

Suitable for use with all Decra tile systems.

Cover: 18m (36 linear metres per pack,

providing vent filler strip to cover both sides

of a 18m long ridge or hip).

Provides 5,000mm2 airflow per linear metre

each side of ridge line.

Order Code: DVUXW1

Ridge ventilationonly

Decra Classic D Ridge Vent Filler



of a 18m long ridge or hip). Provides

5,000mm2 airflow per linear metre each side

of ridge line.

Order Code: DVRXW1

Decra Parctile D Ridge Vent Filler



of a 18m long ridge or hip). Provides

5,000mm2 airflow per linear metre each side

of ridge line.

Order Code: AVRXW1

Eaves ventilation

10mm Eaves Vent System

Cover: 6m; Provides 10,000mm2 airflow per

linear metre. Pack includes over fascia

ventilators, continuous rafter roll and gutter

spacer bracket (gutter spacer brackets are

not suitable for use with Icopal Gutter

System).

Order Code: DVEXW1

25mm Eaves Vent System


linear metre . Pack includes over fascia

ventilators, continuous rafter roll and gutter

spacer bracket (gutter spacer brackets are

not suitable for use with Icopal Gutter

System).

Order Code: DVEXW2

FV100 10mm Over Fascia Vent Strip


linear metre. Continuous Rafter Roll and

Gutter spacer brackets not included.

Order Code: DVVXW1

FV250 25mm Over Fascia Vent Strip

Cover: 12m; Provides 25,000mm2 airflow

per linear metre. Continuous Rafter Roll and

Gutter spacer brackets not included.

Order Code: DVVXW2

Decra Eave Mesh

100m roll x 60mm wide, 4mm

ventilated insect screening. Designed for use

on over-felt pitched re-roofing applications

and warm roof situations. Where used in

warm roof situations this product must be

used in conjunction with Decra warm roof

eaves guard and Decra warm roof eaves

closure flashing.

Order Code: DXUW1

Gas flue ridge

Gas flue ridge terminal

For use with Classic, Plus Tile, Decra

Stratos and Parctile systems. Suitable for

use with Decra D Ridges only. Adaptor for

connection to flue not included.

Order Code: DVG_W1

Adaptors

In-line Tile Vent Adaptor

For use with Classic, Plus Tile, Oberon,

Parctile and Stratos In-line Air Vents.

Order Code: DVSXW1

Flexi-Pipe

Order Code: DVFXW1

For ventilation requirements

and details see Page 78

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Underlays, membranes andassociated accessories

A range of high performance underlays

and membranes ideally suited for use

with Decra Roofing Systems. Using

Decra underlays and membranes

simplifies ordering and delivery and

ensures a fully compatible and

exceptionally durable roofing system.

Felt underlayDecra 300 High Performance Underlay

50m x 1m roll

Order Code: FRCA3

Decra 300 is manufactured from a specially

formulated polyethylene with a multifilament

polypropylene reinforcement grid. This

provides exceptional strength and durability,

and Decra 300 High Performance Underlay

can be confidently expected to last the life of

the roofing structure.

Decra 300 High Performance Underlay is

suitable for use on all tiled roofs where

insulation is provided at ceiling level and the

roof is ventilated in accordance with

BS5250. See Page 80.

n Designed to replace traditional BS 747

Type 1F bituminous based felts.

n Extremely durable; will not rot at

gutter level.

n Lightweight and strong.

n Superior tear resistance.

n Comfortable to handle.

n Offers greater strength and higher

performance than Decra TwoF underlay.

Estimating guideAssumes Decra 300 underlay has a

horizontal lap of 150mm and allows for

an average percentage of on site

wastage.

For Decra Classic, Plus Tile,

Elegance and Parctile:

Multiply the number of tiles ordered by

0.011.

For Decra Stratos Tile and Oberon:

Multiply the number of tiles ordered by

0.010.

Example:

Project requires 1000 Decra Classic:

1000 x 0.011 = 11 rolls underlay needed.

Decra TwoF Economy Underlay

30m x 1m roll

Order Code: FRCA2

Suitable for use on all tiled roofs where

insulation is provided at ceiling level and the

roof is ventilated in accordance with

BS5250. See Page 80.

n Designed to replace traditional BS 747

Type 1F bituminous based felts.

n Extremely strong, will not tear around

nails, comfortable to handle.

n Suitable for new build and refurbishment

projects.

Estimating guideAssumes Decra TwoF underlay has a

horizontal lap of 150mm and allows for

an average percentage of on site

wastage.

For Decra Classic, Plus Tile,

Elegance and Parctile:

Multiply the number of tiles ordered

by 0.022.

For Decra Stratos and Oberon:

Multiply the number of tiles ordered

by 0.019.

Example:


1000 x 0.022 = 22 rolls underlay needed.

BreathermembranesDecra 700 High Performance Breather

Membrane

50m x 1.5m roll

Order Code: FRCA4

Manufactured from a specially formulated

microporous film, laminated between two

layers of non-woven polypropylene. This

provides one of the highest permeability

figures of any breather membrane.

Decra 700 High Performance Breather

Membrane has a low ratio of calcium

carbonate filler to polymer, which cements

the structure of the material together. This

ensures excellent durability and resistance to

UV degradation.

Designed for use on warm and cold roofs

where the roof is constructed in accordance

with BS5250, 2002, Control of

Condensation in Buildings. See Page 80.

n Outstanding breathability.

n Unique microporous film specifically

designed for roofing.

n UV stabilised.

n Maintains its performance at virtually all

temperatures.

n Extremely durable, lightweight and strong.

n Large roll size reduces wastage and

increases speed and efficiency of

installation.

n Energy efficient.

n Entirely recyclable.

Adhesive tapesDecra Single Side Underlay Tape

20m long x 50mm wide single sided

adhesive tape.

Order Code: FRTI1

n For use with Decra Underlays and

Breather Membranes where penetrations

occur through underlay (e.g. sealing

around rooflights, pipes, etc.).

n Can also be used to seal excessive

underlay laps.

Decra Double Side Underlay Tape

22.5m long x 10mm wide x 2mm thick

double sided butyl adhesive tape.

Order Code: FRTI2

n For use with Decra Underlays and

Breather Membranes where penetrations

occur through underlay (e.g. sealing around

rooflights, pipes, etc.).

n Can also be used to seal excessive

underlay laps.

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Estimating guideAssumes Decra 700 Breather Membrane has a horizontal lap of 150mm and allows for

an average percentage of on site wastage.

For Decra Classic, Plus Tile, Elegance and Parctile:

Multiply the number of tiles ordered by 0.007.

For Decra Stratos and Oberon:

Multiply the number of tiles ordered by 0.006.

Example:


1000 x 0.007 = 7 rolls Breather Membrane needed.

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Eaves protection systems

Eaves Guard

Pitched roof underlays are normally dressed

into the eaves gutter, leaving a strip of

material exposed. Some underlays can

deteriorate and even disintegrate after

relatively short exposure to water and

sunlight. If no provision is made for eaves

protection, this can result in:

n Internal leakage.

n Rotting of the rafter feet.

n Rotten soffits.

n Expensive future maintenance costs.

BRE Defect Action Sheets and BS 5534:

2003 (Code of Practice for Slating and

Tiling) recommends the use of a more

durable material for these exposed areas.

The Decra Eaves Guard is designed to meet

these requirements. This highly UV resistant

polymeric eaves protection system is

extremely durable and will give maintenance-

free service for many years.

Decra Eaves Guard 400

30m pack

Order Code: DXUM400

For use with Decra Classic, Elegance,

Plus Tile and Parctile.

Decra Eaves Guard 370

30m pack

Order Code: DXUM370

For use with Decra Stratos and Decra

Oberon tiles.

Decra Warm Roof Eaves Guard

30m pack

Order Code: DVES60

For use with all Decra tile profiles in warm

roof situations where the breather

membrane sits on top of insulation board.

Decra Eaves Guard is available in three types:

External weather sheet

1000 Cover width

Overall width

333.3333.3 333.3

30.530.527

50

30.5

Internal liner sheet

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Warm roof insulated tile support system

The Decra KS 1000 TS Tile Support System

provides high performance insulation with

low air leakage, rapid installation and zero

defect construction quality. This through-

fixed roof panel can be used for all building

applications above 4° and ensures that

construction quality matches the designers’

specification over the life-cycle of the

building.

n Full compliance with Part L2 (England and

Wales) and Part J (Scotland) Building

Regulations and Standards.

n 5m3/hr/m2 airtightness.

n 100% reliable thermal performance and

insulation continuity, with no cavities or

gaps, no cold bridges and no risk of

interstitial condensation.

n Pre-engineered system enables rapid site

installation and significant reduction in build

time.

n Complies with HSE and CDM safety

requirements.

n Firesafe Loss Prevention Council (LPS

1181) and Factory Mutual cores available.

n Lower installed cost.

n Guaranteed long term performance.

Dimensions and weights

The system is available in 40, 50, 60, 80 and

100mm thicknesses.

Lengths

KS 1000 TS panels are supplied in standard

lengths 1.8m to 12m. Wherever possible

panel lengths should be ridge to eaves

without end laps.

Panels 12m to 22m can be supplied subject

to transport surcharge. Panels less than

1.8m long can be supplied, but do not have

a cut back and are subject to extra charge.

Panel End Cutback

To ensure no gaps in insulation at panel

joints. The recommended cut back for panel

end lapping is 150mm.

Panels are normally produced with a

minimum cutback of 10mm. Cut backs of

up to 175mm can be manufactured.

If flush ended panels (no cut back) are

required, these can be manufactured with

one flush end and a 10mm cut back on the

opposite end, based on panels exceeding

1.8m in length. Panels less than 1.8m long

requiring a cut back are subject to extra

charge.

Fastening

Panels should be fixed with SFS Stadler

austenitic stainless steel fasteners, size and

type depending upon purlin. Consult Decra

for guidance.

Fixings should be located in accordance

with the illustration above, at every purlin

position.

Battens

Battens should be fixed directly to the

‘crowns’ of panels, as shown below.

Plastisol batten support flashing or a short

piece of timber should be used at batten

joints.

Full, project-specific installation details are

provided with each order.

Robust, 125mm rainwater drainage

system manufactured in galvanised steel

with high performance Plastisol coating.

Available in black or white.

The Icopal Rainwater System is lighter and

easier to handle than cast iron or aluminium,

and is far stronger and more durable than

plastic. The Plastisol coating has high colour

stability and resistance to fading or

embrittlement. The scratch resistant surface

ensures excellent flow performance and

negligible maintenance.

Superior performance

n High flow capacity.

n Very low maintenance.

n Vandal resistant.

Easy installation

n Simple and fast push-fit connection.

n Safely accepts the weight of a ladder.

without risk of fracture or deformation.

Exceptional durability

n UV resistant – will not become fragile or

brittle with age.

n Low co-efficient of thermal expansion – no

bending, warping and consequent leaking

joints.

Fully tested

The Icopal Rainwater System complies with

the following standards:

BS EN 612: 1996 Eaves Gutters and

Rainwater Downpipes of Metal Sheet.

BS 6367: 1983 Code of Practice for

Drainage of Roofs and Paved Areas.

BS EN 1462: 1997 Brackets for Eaves

Gutters, Requirements and Testing.

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Icopal rainwater system

125mm Half roundgutter systemGutter

Typical flow capacity 1.37 litres/sec. See

page 120 for details.

Nominal Size: 125mm

Order Code: RGL_S4

Length: 4m

Colours: Black, White

Gutter Fascia Bracket

For support centres, see page 120.

Nominal Size: 125mm

Order Code: RGF_S1


Gutter Union Joint

Nominal Size: 125mm

Order Code: RGU_S1


90° Gutter Angle - Internal

n 135° angles available to order.

Nominal Size: 125mm

Order Code: RGAI_S1


90° Gutter Angle - External

n 135° angles available to order.

Nominal Size: 125mm

Order Code: RGAE_S1


Universal Stop End

n Requires use of sealant

Nominal Size: 125mm

Order Code: RGS_S1


Running Outlet

Nominal Size: 125mm

Order Code: RGO_S1


Rafter Brackets (160mm)

Nominal Size: 125mm

Order Code: RGB_S1


Rafter Bracket Bending Tool

Nominal Size: 125mm

Order Code: RGT_S1

Gutter Spacer

n For use with 10mm and 25mm top

mounted fascia ventilation systems.

Nominal Size: 10mm

Order Code: RGS10S

Nominal Size: 25mm

Order Code: RGS25S


Touch Up Paint

Nominal Size: 125ml

Order Code:

BLACK – RGPBS1

Order Code:

WHITE– RGPWS1

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90mm DownpipesystemDownpipe

n With integral socket

connection .

Nominal Size: 90mm

Length: 2.5m

Order Code: RDP_S25

Length: 3.0m

Order Code: RDP_S3


Middle Section Pipe


connection.

n For use in conjunction

with Pipe Bend 75° to

form extended swan necks.

Nominal Size: 90mm

Length: 0.5m

Order Code: RDM_S1


Offset Bend 75°

n 2 units required to

form a swan neck for

soffit overhangs up to

200mm.

n Use in conjunction with Middle Section

Pipe to form extended swan necks.

Nominal Size: 125mm

Order Code: RDO_S1


Downpipe Bracket

Nominal Size: 90mm

Order Code: RDB_S1


Downpipe Connector

n To join two cut

sections of Downpipe

where integral socket

connection has been

removed.

Nominal Size: 90mm

Order Code: RDC_S1


Rainwater Shoe

Nominal Size: 90mm

Order Code: RDS_S1


Branch 75º


connection.

Nominal Size: 90mm

Order Code: RDR_S1


Water Hopper Funnel

Nominal Size: 90mm

Order Code: RDH_S1


Extension Pipe

n A sliding pipe section which is used

between Downpipe and Downpipe Drain

Trap.

Nominal Size: 90mm

Order Code: RDE_S1


Downpipe Drain Trap

n Prevents leaves and

twigs from being

washed into the

underground drainage

Nominal Size: 90mm

Order Code: RDD_S1


Downpipe Drain Trap

n Provides connection

between Drain Trap and

pipe to underground

drainage systems.

Nominal Size: 90mm

Order Code: RDDU_S1



ICOPAL RAINWATER SYSTEM CONSTRUCTION

Passivation coating Zinc galvanisation – 275 g/m2

Acrylate primer

Plastisol coating

High quality steel core

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Tools

Decra Guillotine

For cutting Decra tiles (except Decra Plus)

Available for purchase or weekly hire.

Order Code: DFGB1 (purchase)

GUILLO (hire)

Decra Bender

For forming downturns at valleys and

upstands at abutments and hips for

(all Decra tiles).


Order Code: DFBB1 (purchase)

BENDER (hire)

Decra Bender Attachment

The bender attachments bolts on to the

Decra Bender and is used for forming

upstands along the full length of Decra tiles

(all except Decra Plus).


Order Code: DFAB1 (purchase)

ATTACH (hire)

Decra Plus Tile Clamp

Specially designed clamp to secure Decra

Plus Tiles for cutting. Fits standard

‘Workmate’ appliances.


Order Code: PFCD1 (purchase)

CLAMP (hire)

Decra Plus Cutting Blade

A specially selected reciprocating sawblade,

designed to cut Decra Plus tiles without

damaging the galvanised coating. Supplied

in packs of five, the 150mm long blades are

suitable for use with AEG, Atlas Copco,

Bosch, Black & Decker, De Walt, Elu, Flex,

Hitachi, Makita & Metabo, and Skil

reciprocating saws.

Order Code: PFSW2


For use with Paslode Impulse Cordless

Nail Gun.

Large Pack

Contains 5000 collated Decra nails and fuel

cells. Enough to install up to 1250 Decra

Classic, Elegance, Stratos Tiles and Parctile,

or 1000 Decra Oberon Tiles.

Order Code: DNXP1

Handy Pack

Contains 800 collated Decra nails and 1 fuel

cell. Enough to install up to 200 Classic,

Elegance, Stratos Tiles and Parctile, or 160

Decra Oberon Tiles.

Order Code: DNXP2

Paslode Impulse Cordless Nail Gun

For fast installation of Decra tiles. No hoses,

compressors or cables required. Nail gun

comes complete with:

n Hard sided carrying case.

n Rechargeable battery.

n 2 hour AC battery charger

n Convenient storage compartments for fuel

cells and Decra Nails.

n Complete easy to follow owners manual

n Clear safety glasses.

Not included:

n Fuel cells.

n Decra Power nails.

IMPORTANT NOTES

1. Nail Gun system not suitable for use with

Decra Plus tiles

2. Paslode nails must never be used to fix

Decra Tiles. Only Decra Power Nails are

suitable.

Order Code: DNXP3

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ApprovalsDecra Tiles

Decra Classic, Decra Plus Tiles, Decra

Oberon Tiles, Parctiles and Decra Stratos

are covered by British Board of Agrément

Certificate No. 95/3122 and are

manufactured to ISO 9001.

The tiles comply with the relevant

requirements of:

n The Building Regulations 1991 (C4)

England and Wales

n Building Regulations (Northern Ireland)

1994

n The Building Standards (Scotland)

Regulations 1990

n BS 5534 Part 1: 2003: Code of practice

for slating and tiling (including shingles).

The Building Regulations, Republic of

Ireland 1991

n Institute of Industrial Research and

Standards (Eire)

Fire

Decra Classic, Decra Plus Tiles, Decra

Oberon Tiles, Parctiles and Decra Stratos

Tiles hold Yarsley Certificate Number

C74688/1. AA Classification. [Note: Decra

Tiles achieve the following ratings:

BS 476: Part 3: 1958 Class SAA in the

Building Regulations 1985].

Ventilation

Decra Ventilation systems comply with or

exceed Building Regulations 2004 (C2) and

BS 5250:2002, Code of practice for control

of condensation in buildings.


The Icopal rainwater system complies with

the following standards:

BS EN 612: 1996 Eaves Gutters and

Rainwater Downpipes of Metal Sheet.

BS EN 12056-3: 2000: Gravity drainage

systems inside buildings. Roof drainage,

layout and calculation.

BS EN 1462: 1997 Brackets for Eaves

Gutters, Requirements and Testing.

Composition andmanufactureDecra Tiles (except Elegance)

Decra tiles comprise a steel core with state

of the art zinc aluminium galvanising,

encapsulated with multi-layer epoxy,

polyester, acrylic and stone coatings. This

unique multi-layered coating system results

in a tile of exceptional durability.

Properties and performance

Clear acrylic overglaze

Stone granules ceramicallyglazed for colour

Acrylic resin

Epoxy primer

Chromate conversion

Zinc/Aluminium coating

0.43mm Steel base

Zinc/Aluminium coating

Chromate conversion

Epoxy primer

Polyester coating

COMPOSITION OF A DECRA CLASSIC TILE

0.43mm steel base zinc/aluminium coated

Polyester coating to front and back of tile

Unique four process powder coating system isapplied to the top surface of the tile, providingan extraordinary depth and opacity of lustre

Underside of tile incorporates a Decra acousticsystem (patent applied for)

COMPOSITION OF A DECRA ELEGANCE TILE

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Decra Elegance

Elegance tiles comprise a steel core with

state of the art zinc aluminum galvanising,

encapsulated within multi-layer epoxy,

polyester coatings. In addition an industry

unparalleled four process powder coating

system is applied to the top surface of the

tile, which provides an extraordinary depth

and opacity of lustre. This unique multi-

layered coating system results in a tile of

exceptional durability.

Icopal Rainwater System

The Icopal 125mm rainwater system is

manufactured from galvanised steel with a

long-lasting, low maintenance Plastisol

coating.

DurabilityDecra Tiles

Decra Tiles are manufactured from zinc

aluminium galvanised steel. This is the most

advanced galvanising process, and provides

far greater durability and performance than

traditional zinc galvanising.

Performance tests from leading steel

manufacturers have shown a life expectancy

of zinc aluminium galvanising provides a life

expectancy up to 18 times that of traditional

zinc galvanising.

Tests relating to 25 and 30 year atmospheric

corrosion resistance provide a calculated

zinc aluminium galvanised coating life of up

to 200 years.

Decra roof tiles may therefore be confidently

expected to have a product life which will at

least match and probably exceed the normal

design life expectancy of a building - 60

years.Section 13 (Durability) of BBA

Certificate 95/3122 Decra Roof Systems Ltd

states.

“The epoxy, polyester, mineral-filled acrylic

and aluminium zinc alloy coatings will

protect the steel substrate against corrosion

and will give the product a life in excess of

40 years”.


Steel core and Plastisol coating provides

excellent longevity and low maintenance.

Strength andstabilityDecra Tiles

Wind uplift

The Decra roof system offers outstanding

resistance to wind uplift. Fixed in

accordance with recommendations, Decra

tiles will meet wind loading requirements for

all parts of the UK and Ireland.

Resistance to damage

Decra Plus tiles provide exceptional strength

and resistance to damage. They are

extremely resistant to deformation by heavy

impact or maintenance traffic.

Other Decra systems may safely be walked

on, but are not as resistant to heavy impact

as Decra Plus tiles.

The downturned front edge and

upturned rear edge of each tile provides

a strong, weatherproof, overlapping and

interlocking roof covering.

Fixings at top and bottom of each tile

achieves far greater wind resistance than

traditional roof tiles and slates

The high temperature ceramic glazing to

the granular surface of the tiles provides

exceptional weather resistance and

colour stability.

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The Icopal system resists embrittlement due

to the effects of UV, thus achieving far

greater long term strength than PVC-U

systems. The rolled front of the gutter will

safely accept the weight of a ladder, and the

operative on it, without risk of fracture or

deformation. Icopal gutter and downpipe

brackets provide a secure, stable fixing.

BiologicalDecra Tiles

Decra Tiles are impervious to attack from

vermin and are highly resistant to fungal

infection. They do not suffer from staining by

efflorescence or lime bloom.

The acrylic resin coating has a non-toxic

fungicide incorporated into the coating for

added protection.


Icopal Rainwater Systems are not subject to

fungal infection, nor to attack from vermin.

ThermalDecra Tiles

Thermal conductivity:

(k value) is 0.00341 resistance m2/k/w.

Protection of Steel at Cut Edges

Two differing metals each with a different

electric potential, in direct physical contact

with each other and an electrolyte (water)

form a galvanic cell. Within this galvanic cell

electrons from the zinc and aluminium

atoms which have a lower electric potential

transfer themselves to the steel atoms which

have a higher electric potential. This

charging of additional electrons to the steel

atoms protects the steel from corrosion.

Corrosion will only take place in any metal

when electrons from a metal atom are lost

into an electrolyte (water). Since the steel

atoms are being charged with electrons

corrosion will not take place.

0.2765%For every million metres square of Decra tiles installed in the

UK & Ireland only 0.2765% ( 2,765m2) have been found to be

defective and replaced under Decra’s unique warranty.

Did you know?

From 1977 - 2005

Over11,000,000m2

of Decra tiles have

been installed in the

UK & Ireland.

No other metal roof tile

system has a track record

even remotely like this.

Over11,000,000m2

Zinc/Aluminium

Electrolyte(Water Droplet)

Transfer ofZinc/AluminiumElectrons to Steel

Zinc/Aluminium

Cut Edge of Tile

Steel

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Properties and performance

Effect of sunlightDecra Tiles

The Decra roof system is colour stable. The

stone granular finish of the tiles is

ceramically glazed with artificially coloured

silicates fired in an oven at 1100°C. This

ceramic process gives the Decra tile far

greater colour stability than can normally be

obtained using a dye finish or an acrylic

paint finish alone.

The final resin coating contains an inhibitor

to protect against ultraviolet light.


The Plastisol coating has high UV resistance

and will not become fragile or brittle with

age.

CompatibilityDecra tiles and the Icopal Rainwater System

are compatible with most common building

materials.

Decra tiles and the Icopal Rainwater System

should not receive rainwater drainage/run off

from copper roofs. Cement mortar bedding

should not be used with Decra tiles.

EnvironmentDecra Tiles

The core of Decra tiles is made from steel,

the most recycled material in the world. On

average 25% of the steel content of each tile

originates from recycled steel. In turn, at the

end of its useful life, every Decra tile is

suitable for recycling.

One cubic metre of Decra tiles covers the

same roof area as between 6 and 12 cubic

metres of clay or concrete tiles. In the

number of pallets required there would be

eight for concrete or man made slates to

one of Decra. This volumetric efficiency

means the call on fossil fuels and emission

of carbon based gases in the course of

delivery is much reduced by Decra tiles.

A full Environmental Product Declaration

regarding Decra roof tiles is available free

from Decra Roof Systems. To obtain a copy,

please contact sales or technical services, or

visit our website: www.decra.co.uk


The system is manufactured from approx.

25% recycled materials and, at the end of its

useful life, can then be fully recycled into

high quality products. This makes it far more

environmentally friendly than plastic systems.

Concrete plain tile

Clay plain tile

Interlocking concrete tile

The graphic shows the volumetric efficiency of Decra tiles compared to traditional

materials. The environmental and logistical benefits are obvious.

Decra Traditional

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The torture test was devised to

illustrate the resistance of Decra tiles to

man made or natural forces.

“Hurricane to order” was the headline

in ‘The Auckland Star’ 1968. The Air

New Zealand Electra’s 4,000Hp jet prop

engines produced winds of up to

120mph. Simultaneously, water jets

simulated monsoon rainfall.

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This section serves as a guide to the design of new and refurbished roofs using

Decra's range of tiles, rainwater goods and associated accessories. Each typical

roof construction type and detail is demonstrated with the use of a technical

illustration based upon a CAD drawing. Each drawing has a unique reference

number that is applicable to each tile type and its suitability for England, Wales,

Ireland and Scotland.

Decra has a wide range of CAD drawings available for download from their

website - please visit www.decra.co.uk to access drawings for all tile types and

recommended construction methods for England, Wales, Scotland and Ireland.

Detail drawings featured in this section are typical examples and are for illustrative

purposes only.

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Design and installation

Design and installation considerations

New build 74

Refurbishment Projects 74

Flat to Pitched Roof Conversions 74

Exposure and wind loading 74

Low pitched roofs 74

Cut edges 74

Specification writing 74

Tile bonding options 75

Underlays & breather membranes 75

Tile battens 76

Control of condensation 78

Design and installation detailing

Eaves 84

Tile ventilators 88

Verges/Gables 90

Abutments at sides & top edges 92

Ridges – unventilated 96

Ridges – ventilated 98

Monopitch Ridges – unventilated 102

Monopitch Ridges – ventilated 102

Hips – unventilated 104

Hips – ventilated 106

Valleys 108

Velux windows 110

Vertical tiling 114

Mansard & changes in pitch 116

Gas flue ridges 118

Icopal Rainwater Systems 120

Important Copyright Information. Please read before incorporating the enclosedinformation into your specification.

Ownership of copyright and all other intellectual property rights in this publication (includingall drawings, specifications and supplementary documentation) remain at all times with DecraRoof Systems Ltd ("Decra"). Decra grants you a limited licence to use the contents of thispublication on the terms of this Agreement.

You may only use this publication to prepare specifications, presentations and detailedinformation for projects involving the construction of a building or buildings on which you areengaged as consultant or contractor, and for which Decra Roofing Products have been orwill be specified. The publications contents have been compiled on the basis of UK and Irishbuilding practices, and should not be used elsewhere unless you take account of all relevantdifferences.

All other uses of the publication are specifically excluded, and its contents may not becopied or distributed to third parties, and may not be amended for use with other productsor by other manufacturers.

You may not reverse-engineer, de-compile or modify the publication in any way except to theextent required to be permitted by law.

Any misuse of the publication or breach of this Agreement or any of Decra's intellectualproperty rights can and will be pursued by Decra to the full extent of the law.

Please feel free to contact Decra Roof Systems if you require clarification of any of the terms.

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Design considerations

New build projectsPitch: Ensure pitch is suitable for selected

Decra system. See Data Files, Page 33.

Structure: Decra’s lightweight roofing

technology dramatically reduces the dead

load of the roof, compared with clay or

concrete tiles. This enables faster

construction and significant savings in both

the size and cost of the supporting

structure, releasing money that can be used

to good effect elsewhere in the build.

RefurbishmentprojectsPitch: Ensure pitch is suitable for selected

Decra system. See Data Files, Page 33.

Structure: Ensure the existing structure is

sufficient to support the new roof. Decra’s

lightweight roofing technology provides an

extremely versatile roofing solution, lighter in

weight than almost any other pitched roof

covering.

Flat to pitched roof conversions

Decra light weight roof systems offer the

ideal permanent solution to problem flat

roofs:

n Light weight system – reduced

requirement for additional supporting

structure.

n No need to strip old roof – building the

new pitched roof structure and finish over

existing flat roof means less disruption for

tenants and virtually eliminates the chances

of water ingress and consequent internal

damage.

n Decra tiles are light and easy to handle -

offering greater safety at height.

n Completely dry-fix system – exceptional

durability and low maintenance.

n Enhanced finished appearance –

increasing the value of the building,

increasing tenant satisfaction and potentially

reducing occurrence of vandalism.

Low pitched boarded and felted roofs

n Decra Classic, Plus tiles and Elegance

are suitable for roof pitches down to 10°,

Decra Stratos tiles and Parctiles to 12° and

Decra Oberon tile down to 15° - all much

lower than traditional roofing materials.

n Extremely high resistance to wind uplift.

n Wide range of ventilation options to bring

the roof up to current requirements.

n Often no need to strip the old felted roof.

n Improved aesthetics.

n Longer lifespan.

Exposure and wind loading

The Decra Roof System is completely dry

fixed and, unlike traditional tiles, places no

reliance upon the deadweight of the tiles to

resist wind uplift. Decra tiles are secured

through their top and bottom edges into tile

battens. The inherent strength of this fixing

method is further enhanced by the lateral

positioning of the fixings – all the loads

exerted are at 90° to the plane of the fixings.

In effect, to dislodge a tile wind has to shear

through the coated galvanised fixing nails.

Whatever the roof pitch, from 10° to 90°,

Decra tiles are suitable for even the most

severe exposure conditions as defined in BS

6399: Part 2: 1997, Loadings for Buildings.

Cut edges

Decra tiles require no further protection to

the cut edge providing they are cold cut

using a Decra guillotine, tin snips,

reciprocating saw or nibblers. This allows a

protective cathodic process to take place,

effectively re-sealing the exposed cut edge

with a new protective layer of zinc aluminium

galvanising.

Specification of works

Model NBS specification clauses are

available for all Decra tile systems. They are

provided:

n Available for download from our

website: www.decra.co.uk

n Through the NBS Spec Writer.

Project specific specification

Decra has a dedicated field service, with a

network of technical advisers throughout the

UK & Ireland, available to provide a bespoke

written specification to meet your exact

project requirements.

Decra unique top and bottom fixing method provides unparalleled resistance to wind uplift

Nails secured throughbottom edge of tiles and top

edge of underlying tile.

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Tile bondingoptionsFor best aesthetic results and ease of laying,

it is recommended that Decra tiles are laid

as follows:

Decra Classic, Decra Plus, Decra Elegance

and Parctiles: Laid straight bond or broken

bond on simple roof shapes and broken

bond on complex roof shapes.

Decra Oberon and Decra Stratos: Laid

broken bond in all cases.

UnderlayRoofing underlay is required and should

comply with the recommendations of

BS5534: 2003: Code of Practice for Slating

and Tiling, BS 8000-6: 1990 Workmanship

on Building Sites, and BS 5250: 2002: Code

of Practice for Control of Condensation in

Buildings. For installation guidance, see

Sitework, page 131.

Unsupported (roofing underlays draped

over rafters or counterbattens): Underlay

should comply with BS 747 2000 Type 1F or

5U.

NOTE: Although 1F & 5U may be used with Decra roof

systems, Decra recommend selection of the appropriate

Decra underlay see pages 60 and 79.

Fully supported (roofing underlays laid

directly to boarding or sarking): Underlay

should comply with the recommendations of

BS 5534: 2003: Code of Practice for Slating

and Tiling. It should also be vapour

transmission tested in accordance with

BS 3177.

Decra underlays

High performance underlays and breather

membranes for use with the Decra Roofing

system are available from Decra, and can be

ordered with Decra Roof Tiles.

These underlays have been selected by

Decra because they offer the best value with

regard to performance and specification

when used with Decra roof systems.

Underlays supplied by Decra also offer a

one-stop roofing solution, maintaining the

quality of the total roof envelope and

consequently reducing risk for the roof

client. For Decra Underlays see Page 60.

Recommended laps for underlay

Pitch Minimum headlap Minimum Sidelap

Not Fully Supported Fully Supported

10° to 12° 300mm 200mm 100 – 150mm

12.5° to 14° 225mm 150mm 100 – 150mm

15° to 34° 150mm 100mm 100 – 150mm

35° and above 100mm 75mm 100 – 150mm

NOTES:

1. Any penetrations to the underlay should be suitably sealed to prevent water ingress.

2. Underlay laps to valleys should comply with recommendations of BS 5534.

For technical support regarding any of

your current or future projects, please

contact Decra Technical Services:

n Telephone: 01293 545058

n Fax: 01293 562709

n Email: [email protected]

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Design considerations

Rafter or truss Minimum nailing Size of

spacing requirement batten (mm)

(See note 3 below) (See note 2 below) Width Depth

Decra Classic, Plus Tile, Oberon Tile, Parctile, Elegance:

450 75mm x 3.35mm 38 25

600 75mm x 3.35mm 50 25

900* 100mm x 4.00mm 50 50

1200* 100mm x 4.00mm 50 50

1500* 125mm x 12g screw 50 65

Decra Stratos Tile:

450 90mm x 3.35mm 50 38

600 90mm x 3.35mm 50 38

900* 100mm x 4.00mm 50 50

1200* 100mm x 4.00mm 50 50

1500* 125mm x 12g screw 50 65

For roofing and vertical applications

*With rafter truss spacings at 900mm or more, polypropylene or nylon tape should be nailed to the rafters to support the underlay.

NOTES

1. Batten sizing: The batten size usable is

also defined by the strength, dimensional

tolerances and species of timber. Timber

should be of following species Type A:

Imported Whitewood, Imported Redwood,

Canadian/USA Spruce-pine-fir, USA

Southern Pine or species Type B: British-

grown Corsican Pine, British-grown Scots

Pine, British-grown Sitka Spruce. For

maximum nail withdrawal performance

preference should be given to Type A

species (which correspond to strength

classes C16/18/22).

Tolerances on the basic size of timber batten

should be: width +3 mm or –3mm; depth

–0 mm or +3 mm; based on measurement

at a reference moisture content of 20% (see

BS5534: 2003, annex C).

Batten sizes other than those given in the

table above should be designed in

accordance with BS5534: 2003, annex

E & F.

2. Batten Fixings: Batten fixing nails should

be annular ring shank or helical twist shank

as defined in BS 1202: Part 1. The batten

fixing sizes shown are indicative of the

requirements of a typical two storey

building in an area of low to medium

exposure. Reference should always be

made to BS5534, 2003, Code of Practice

for Slating & Tiling for a project specific

batten fastener.

3. Span is defined as the distance between

centres of supports, or the clear distance

between the face of supports plus half the

bearing distance at each end support,

whichever is the lesser. The minimum end

bearing length should be 17.5mm.

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Setting out battens

The first batten should be installed at the

eaves, in accordance with guidance on

page 76. Working from bottom of rafter, the

rest of the battens should be fixed at

centres as set out in Table 1, adjacent.

Measure from lower face to lower face.

Table 1 – Batten centres

Decra system Batten centres

(mm)

Decra Classic,

Elegance and Parctile 370mm

Decra Oberon Tile 160mm

Decra Stratos Tile 320mm

Decra Plus Tile 368mm

Tile Battens, size determinedby rafter spacing, refer to table below

Decra Classic

370

370

DECRA CLASSIC– Standard section through tiles Detail from DTSE004

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Control of condensation

Good roof design extends beyond the

choice of roof covering. It is just as

important to protect the supporting

structure from the damaging effects of

condensation. The most effective and

proven method for preventing condensation

is by providing appropriate ventilation, in

accordance with the Building Regulations

Approved Document C2 2004 and BS

5250: 2002.

Significant changes have occurred in recent

years and the introduction of low

resistance, vapour permeable underlays

and breather membranes has offered

specifiers and designers the opportunity to

look at pitched roof construction in a new

way.

However, this has lead to much heated

debate regarding the relative merits and

benefits of ventilated and unventilated roof

systems, particularly the need for roof

space ventilation in both warm (insulation at

rafter line) and cold (insulation at joist level)

pitched roofs, especially when vapour

permeable/breathable (type LR) underlays

are used. Building Regulations Approved

Document Part L 2006 and recent revisions

to BS5250: 2002 Control of condensation

in buildings and BS5534:2003 Code of

Practice for Slating and Tiling have sought

to resolve many of these issues.

Decra roof systems include products to

meet these ventilation requirements at high

and low level.

Ventilation requirements of Building Regulations C2 2004 and BS 5250: 2002:

Cold Roofs with large voids above horizontal insulation, which incorporate the use of type HR impermeable underlays.

Scottish practice: Cold Roofs with large voids above horizontal insulation, which incorporate the use of type LR permeable underlays AND high vapour

resistant sarking boards (e.g plywood, orientated strand board etc)

Type of roof Pitch Insulation level Ventilation requirement Ventilation requirementat eaves (per metre) at ridge or top edge (per metre)

Duo pitched more than 15° Joist 10,000mm2 5,000mm2 at each side of ridge*

15° or less Joist 25,000mm2 5,000mm2 at each side of ridge*

* High level ventilation may not be required on low rafter pitches below 35º or at spans less than 10m

Lean to/ Mono-pitched more than 15° Joist 10,000mm2 5,000mm2

15° or less Joist 25,000mm2 5,000mm2

Duo/Mono-pitched From 10° Rafter 25,000mm2 5,000mm2 at each side of ridge

Cold Roofs with large voids above horizontal insulation (which incorporate the use of type LR permeable underlays).

Scottish practice: Cold roofs with large voids above horizontal insulation, which incorporate the use of type LR permeable underlays and low vapour

resistant sarking boards (e.g open jointed sawn sotwood boards (typically 150mm wide) with 2mm gap between.)

Type of roof Pitch Insulation level Ventilation requirement Ventilation requirementat eaves (per metre) at ridge or top edge (per metre)

All dwelling size roofs 10° and above Joist 3,000mm2 (well sealed ceiling) -

All dwelling size roofs 10° and above Joist 7,000mm2(not well sealed ceiling) -

All dwelling size roofs 10° and above Joist - 5,000mm2 at each side of ridge

(well sealed ceiling and not well sealed ceilings)

All larger dwelling 10° and above Joist 5,000mm2 (well sealed ceiling) 5,000mm2 at each side of ridge

size roofs

All larger dwelling 10° and above Joist 10,000mm2 (well sealed ceiling) 5,000mm2 at each side of ridge

size roofs

or

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Selection of underlayBS 5534: Code of Practice for Slating and

Tiling and BS 5250: Code of Practice for

Control of Condensation in Buildings

recognises the following types of underlay

Type HR (High resistance, impermeable

underlays with a water vapour resistance of

greater than 0.25 MN - s/g)

Typical uses: cold roof structures with large

voids above horizontal insulation that are

ventilated using traditional,continuous eaves

and ridge ventilation systems.

Decra 300 High Performance Underlay and

Decra TwoF Economy Underlays comply

with type HR specification performance

requirements.

Where high resistance underlays are used:

n It is normal to ventilate between the

underlay and the insulation

n It is not normal to ventilate above the

underlay (i.e between the underlay and the

roof tiles).

Type LR (Low resistance, permeable

underlay with a water vapour resistance of

less than or equal to 0.25 MN - s/g)

Typical uses: cold roof structures with large

voids above horizontal insulation that are

ventilated using traditional, continuous eaves

and ridge ventilation systems OR breathable

pitched roof systems (cold roofs that are

ventilated above the underlay).


Membranes comply with and exceed type

LR specification performance requirements.

Where low resistance underlays are used:

n Without ventilation between the underlay

and the insulation, it is necessary to

ventilate above the underlay (i.e between

the underlay and the roof tiles).

n Without ventilation between the underlay

and the insulation it is a requirement of BS

5534 that it is necessary to carry out a

condensation risk analysis.

n With ventilation it is normal to ventilate

between the underlay and the insulation.

Scotland: low resistance underlays, laid fully

supported on sarking boards, should for

design purposes be treated as a:

n LR low resistance underlay if installed on

sarking that offers a low resistance to the

passage of water vapour (such as 150mm

open jointed sawn softwood sarking

boards).

n HR high resistance underlay if installed on

sarking that offers a high resistance to the

passage of water vapour (such as

plywood, orientated strand board or

chipboard).

Breather Membranes (membrane with a

water vapour resistance of less than or

equal to 0.6 MN - s/g)

Typical uses: warm roof and cold roof

structures.


Membranes comply with these specified

performance requirements.

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Control of condensation continued

Cold roofconstructions1. Duo-pitched roofs, more than 15° roof

pitch with a high resistance underlay

installed (see page 79). Insulation at

ceiling level.

REQUIREMENT:

Eaves ventilation equivalent to 10mm

continuous opening (on opposite pitches),

and ridge ventilation with a continuous

opening equal to 5mm at each side of ridge.

DECRA SOLUTION:

i) Decravent 10mm Eaves Packs, each pack

providing ventilation for 6 metres of eaves,

installed to provide continuous ventilation to

both eaves.

Alternatively: Tile vents at appropriate

centres to provide equivalent of a 10mm

continuous opening (see tile vent spacing

chart page 89).

ii) Decra Universal Ridge/Hip Ventilator (all

Decra tile profiles) or Decravent D Ridge

system (Decra Classic, Elegance, Parctile,

only) providing continuous ridge ventilation.

See Page 59.




chart page 79).

2. All duo-pitched roofs 15° pitch or less

with a high resistance underlay installed

(see page 79). Insulation at ceiling level.

REQUIREMENT:



and ridge ventilation with a continuous

opening equal to 5mm at each side of ridge.

DECRA SOLUTION:




both eaves.




chart page 89).





See Page 59.




chart page 79).

3. Lean to or mono-pitch roof, more

than 15° roof pitch and above with a

high resistance underlay installed (see

page 79). Insulation at ceiling level.

REQUIREMENT:



and at ridge or high level ventilation with a

continuous opening equal to 5mm.

DECRA SOLUTION:



installed to provide continuous ventilation at

eaves.




chart page 89).





See Page 59.




chart page 89).

5mm

5mm

5mm

Fig 1. Duo-pitched roofs, more than15° pitch. Insulation at ceiling level.

Fig 2. All duo-pitched roofs 15° pitch or less.Insulation at ceiling level.

Fig 3. Lean to or mono-pitchroof, more than 15° pitch.

Insulation at ceiling level.

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4. Lean to or mono-pitch roof, 15° pitch

or less with a high resistance underlay

installed (see page 79). Insulation at

ceiling level.

REQUIREMENT:


continuous opening at eaves, and at ridge or

high level ventilation with a continuous

opening equal to 5mm.

DECRA SOLUTION:




eaves.




chart page 89).





See Page 59.




chart page 89).

Breathable, pitched

roof systems - sealed

well sealed and

normal ceiling?The recent introduction of low resistance,

vapour permeable underlays and breather

membranes has offered specifiers and

designers the opportunity to look at pitched

roof construction in a new way.

The function of a low resistance, vapour

permeable underlays or breather membrane

is to allow internally produced water vapour

to permeate through its special layered

composition to the external environment,

while inhibiting the ingress of wind driven

rain or snow.

By utilising the benefits of vapour

pearmeability specifiers and designers are

able to reduce the traditional ventilation

requirements of cold roof structures. In this

way a significant step can be made to

meeting the Government’s objective in Part

L of the Building Regulations, which require

a substantial reduction in heat loss through

the constructional envelope of a building.

The installation of a well constructed vapour

control layer is pivotal to the success of a

cold roof solution that incorporates the use

of a vapour permeable underlay to achieve a

reduction of traditional ventilation

requirements.

Sealing the ceiling of any building will reduce

both moisture transfer and heat loss, thus

minimising the risk of condensation in the

roof. However, in recent revisions to BS

5250: 2002 (Code of Practice for Control of

Condensation in Buildings) it is

acknowledged that in practice it is extremely

difficult to construct a vapour control layer

that is totally impermeable to water vapour

(i.e airtight) and therefore has created a new

classification “well sealed ceiling”.

Well sealed ceiling

A well sealed ceiling is more achievable than

a sealed (i.e airtight) ceiling, but requires high

standards of workmanship by the trades

involved in installing plasterboard or other

ceilings, plumbing and electrical services. It

is important to consider at design stage how

construction details can be achieved that

are robust over the lifetime of the building.

To meet the requirements of BS 5250: 2002

(Code of Practice for Control of

Condensation in Buildings) a well sealed

ceiling requires the following;

a) The design avoids constructional gaps,

especially at the wall/ceiling junction with dry

lining construction, and holes in the ceiling.

b) No access door or hatch should be

located in rooms where large amounts of

moisture are produced, including kitchens or

bathrooms.

c) Sealed loft hatch, sealed pipe and cable

penetrations and sealed recessed light

fittings. All seals to provide an effective

barrier against moisture entering the roof

space.

d) Penetrations for services and rooflights, to

be permanently sealed.

e) The ceiling is sealed to the external walls

to limit any leakage through cracks.

g) The head of any cavity in any wall or

partition should be sealed to prevent transfer

of warm moist air into the loft.

BS5534:2003 (Code of Practice for Slating

and Tiling) also recommends that a

condensation risk analysis should be carried

out on non ventilated cold roof systems.

5mm

25mm

Fig 4. Lean to or mono-pitch roof,15° pitch or less.

Insulation at ceiling level.

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Cold Roofs with large

voids above horizontal

insulation (breathable

pitched roof systems

incorporating the use

of type LR permeable

underlays)

5. Roofs 10° roof pitch and above with a

low resistance underlay installed (See

Page 79). Insulation at ceiling level

REQUIREMENT OF BS: 5250: CONTROL

OF CONDENSATION IN BUILDINGS

In dwelling size roofs

i) Eaves ventilation equivalent to 3mm

continuous opening at eaves, if the ceiling is

'well sealed' as defined by clause 8.4.1.2 of

BS 5250 or eaves ventilation equivalent to

7mm continuous opening at eaves, if the

ceiling is not well sealed (likely in re-roof

situations).

Note: If there is expected to be a significant

moisture load from construction water in a

new build construction, additional 5mm

minimum ventilation should be provided at

high level.

OR

Alternatively, high level ventilation equal to a

continuous opening of 5mm at either side of

ridge for both well sealed or not well sealed

ceilings.

In larger than dwelling size roofs

i) Eaves ventilation equivalent to 5mm

continuous opening at eaves, if the ceiling is

'well sealed' as defined by clause 8.4.1.2 of

BS 5250 or eaves ventilation equivalent to

10mm continuous opening at eaves, if the

ceiling is not well sealed (likely in re-roof

situations or suspended ceiling situations).

ii) High level ventilation equal to a continuous

opening of 5mm at either side of ridge is

required for both well sealed or not well

sealed ceilings

IMPORTANT NOTE

Where vapour permeable underlays (type

LR) are used to contribute to the control of

condensation, they do so by allowing water

vapour to escape through the material by

diffusion.

It is important that this water vapour can

escape from the batten space (the area

between the underlay and the roof tile) out

to the atmosphere. Specifiers and

designers can achieve this in two ways.

1. Install ventilation openings to the batten

space that are equivalent to a continuous

opening of 25mm at eaves and 5mm at the

ridge and 25mm counterbattens.

2. Install a roof covering that is deemed as

sufficiently air open (as defined in Annexe L

of BS 5534: 2003) and, as a consequence,

will allow sufficient air movement in the

batten space without the need for a

counterbatten cavity or additional ventilation

other than the ventilation requirement shown

above for dwelling size roofs and larger than

dwelling size roofs.

At the design stage, it is important to

consider how construction details that are

robust can be achieved over the lifetime of

the building, and the following issues should

be accounted for:

BS: 5250 states that it is important to

ensure that air paths remain consistent and

unobstructed during the life of the building.

The BRE’s Good Building Guide 37 reminds

specifiers and designers that the airtightness

of tiling systems including those that are

initially air open may alter with time.

It is important to note that with most

traditional tile systems, the air permeability of

the tile changes, depending whether the roof

covering is wet or dry.

It is also important to note that most roof

coverings are designed to posses a life span

of in excess of 30 years and, during this

design life, the air permeability is likely to be

compromised by the build up of dirt silting

up the tile laps and the accumulation of

moss or lichen.

DECRA SOLUTION:

50mm x 25mm counterbattens (finished

size).

i) Decra Eave Mesh, providing 25mm

ventilation, used in conjunction with Decra




system (Decra Classic, Elegance, Parctile


See Page 59.

Alternatively: tile vents at appropriate centres

to provide the equivalent of a 5mm


chart page 89).

5mm

25mm 25mm

Fig 5 Cold Roofs with large voids above horizontal

insulation. Where LR permeable underlays or breather

membrane is installed underneath 25mm deep

counterbattens.

Control of condensation continued

WARM ROOF CONSTRUCTIONS

6. Duo pitch roof with clear air path.

Where underlay/breather membrane is to be

installed on top of counterbattens.

or

Where 50mm air passageway between

insulation and underlay/breather membrane

occurs below the top face of the rafter.

REQUIREMENT:

Eaves ventilation with a continuous opening

equal to 25mm. Free airspace between

insulation and underlay of at least 50mm.

Ridge ventilation with a continuous opening

equal to 5mm at each side of ridge.

Note: in addition to a well seated ceiling, a

separate vapour control layer should be

used on the warm side of the insulation

DECRA SOLUTION:




both eaves.




chart page 89).





See Pages 59.




chart page 89).

7. Duo pitch roof with clear air path.

Where breather membrane is to be installed

on top of rafters (i.e in contact with

insulation) and underneath 50mm x 50mm

counterbattens (or 38mm where Decra 700

breather membrane is used).

REQUIREMENT:

Eaves to eaves ventilation with a continuous

opening equal to 25mm. Free airspace

between insulation and underlay of at least

50mm (or 38mm where Decra 700 breather

membrane is used). Ridge ventilation with a

continuous opening equal to 5mm at each

side of ridge.

DECRA SOLUTION:

Decra Eave Mesh providing 25mm

ventilation used in conjunction with Decra

warm roof eaves guard and Decra warm

roof eaves closure flashing.





See Page 59.




chart page 89).

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5mm

25mm 25mm

Fig 6. Duo pitch roof with clear air path.

Where underlay/breather membrane is to beinstalled on top of counterbattens

or

Where 50mm air passageway betweeninsulation and underlay/breather membraneoccurs below the top face of the rafter (seeleft hand side of diagram).

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Eaves with continuous ventilation

The following table sets out appropriate detailing at eaves for a wide range of roof constructions

Eaves Ventilation System

Setting out point for fasciaboard

Install

Install

Install Eave Batten to rear offascia board

Install Eave Guard

Insulation at ceiling joist level, Roof Pitch morethan 15°.

Decra 10mm Eaves Ventilation System.

15mm below line of top edge of tile battens.

Install Continuous Rafter Roll (in eaves vent pack).

Install Decra Underlay on top of rafters.

For Rafter Centres 450mm & 600mm: Eave battenthe same size as tile batten installed behind fasciaboard (leave 20mm gap between batten and fascia).

For Rafter Centres 900mm & 1200mm,15° - 17.5° pitches: 50mm x 38mm Eave batteninstalled behind fascia board (leave 20mm gapbetween batten and fascia).

For Rafter Centres 900mm & 1200mm,17.5° + pitches: Eave batten the same size as tilebatten installed behind fascia board (leave 20mm gapbetween batten and fascia).

Oberon: Where 50mm x 25mm tile battens are usedinstall arris rail 200mm x 25mm (finished size), Orwhere 50mm x 50mm tile battens are used installarris rail 200mm x 45mm (finished size). Arris railinstalled behind fascia board (leave 20mm gapbetween arris rail and fascia).

Insulation at ceiling joist level Roof pitch15° or less, Rafter Centres up to 600mm

OR

Insulation following line of rafter withinsulation inset into rafters with a 50mmairgap between top of insulation and topof rafter. Roof pitch 15° or less, raftercentres up to 600mm



Install Continuous Rafter Roll(in eaves vent pack).

Install Decra Underlay/Breather Membrane ontop of rafters.

Classic, Elegance, Plus Tile & Parctile:Install Eave batten the same size as tile batteninstalled behind fascia board (leave 20mm gapbetween batten and fascia).

Decra Stratos: Install 50mm x 30mm Eavebatten behind fascia board (leave 20mm gapbetween batten and fascia).

Insulation at ceiling joist level. Roof pitch 15° or less,rafter centres greater than 600mm & not exceeding1200mm

OR

Insulation following line of rafter with insulation insetinto rafters with a 50mm airgap between top ofinsulation and top of rafter. Roof pitch 15° or less,rafter centres greater than 600mm & not exceeding1200mm



Install Continuous Rafter Roll (in eaves vent pack).

Install Decra Underlay/Breather Membrane on top of rafters.

Install treated timber firring piece on top of rafters, eachfirring piece should have a finished size of 580mm x 16mm xrafter width. 16mm end of firring should butt up against theback face of fascia board.

Install 50mm x 25mm eave batten behind fascia board (leave20mm gap between batten and fascia).

NOTE Classic, Elegance, Plus Tile & Parctile: First tilebatten 50mm x 42mm, remaining tile battens should be50mm x 50mm.

NOTE Decra Stratos: First tile batten 65mm x 38mm,remaining tile battens should be 50mm x 50mm.

Classic, Parctile, Plus Tile & Elegance: Install Eave Guard 400.See page 86 for installation instructions.

For Stratos Tile & Oberon: Install Eave Guard 370.See page 86 for installation instructions.

Your roof isconstructed as

follows.

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Insulation following line ofrafter with insulation insetinto rafters with a 50mmairgap between top ofinsulation and top ofrafter. Roof pitch morethan 15°, rafter centres upto 600mm.

Decra 25mm Eaves Ventilation System

25mm below line of top edgeof tile battens.

Install Continuous Rafter Roll(in eaves vent pack).

Install Decra 700 HighPerformance Breathermembrane on top of rafters.

All tile profile exceptOberon: Install Eave battenthe same size as tile batteninstalled behind fascia board(leave 20mm gap betweenbatten and fascia).

Oberon: only: install arrisrail 200mm x 25mm (finishedsize), installed behind fasciaboard (leave 20mm gapbetween arris rail and fascia).

Insulation following line ofrafter with insulation inset intorafters with a 50mm airgapbetween top of insulation andtop of rafter. Roof pitch morethan 15°, rafter centres greaterthan 600mm & not exceeding1200mm.

Decra 25mm Eaves VentilationSystem.

25mm below line of top edge of tilebattens.

Install Continuous Rafter Roll (ineaves vent pack).

Install Decra 700 High PerformanceBreather membrane on top ofrafters.

All tile profile except Oberon:For Rafter Centres 900mm &1200mm, 15° - 17.5° pitches:50mm x 38mm Eave batteninstalled behind fascia board (leave20mm gap between batten andfascia).

All tile profile except Oberon:For Rafter Centres 900mm &1200mm, 17.5° + pitches: eavebatten the same size as tile batteninstalled behind fascia board (leave20mm gap between batten andfascia).

Oberon only: Install arris rail200mm x 45mm (finished size),installed behind fascia board (leave20mm gap between arris rail andfascia).

Scottish Practice, Insulation at ceiling level, Rafter Centres notexceeding 600mm centres. Roof sarking boarded with counterbattens (25mm max thickness) on top.

Where Decra Classic, Elegance, Plus Tile & Parctile are to beinstalled on roof pitches 17.5° and above in pitch.

Where Decra Stratos & Oberon Tiles are to be installed on roofpitches 25° and above in pitch.

Where roof pitches fall below the above parameters refer toprevious column. For roof pitches this low underlay must beinstalled on top of counter battens to ensure sufficient fall intogutter.



Install continuous rafter roll and locate in a position to separate the roofingunderlay from the insulation below. In some re-roofing projects theContinuous Rafter Roll cannot be laid without partial removal of the sarkingfor access. If partial removal of the sarking is not possible or desirablesome other method of ensuring clear ventilation between insulation andsarking should be employed.

Install appropriate Decra Underlay/Breather Membrane on top of rafters andunder counterbattens.

Classic, Elegance, Plus Tile & Parctile: Install 50mm x 50mm eavebatten on top of sarking, leave 20mm gap between batten and fascia andthe sarking boards should be cut back to allow airflow into the loft space.

Decra Stratos: Install 50mm x 63mm deep eave batten on top of sarkingleave 20mm gap between batten and fascia and the sarking boards shouldbe cut back to allow airflow into the loft space.

Oberon only: install arris rail 200mm x 50mm (finished size) on top ofsarking, leave 20mm gap between arris rail and fascia and the sarkingboards should be cut back to allow airflow into the loft space.

Insulation (rigid board type)following line of rafter withinsulation level with top ofrafter or on top of rafter.50mm x 50mmcounterbattens installed ontop of underlay. ORInsulation at ceiling joistlevel, with low resistanceunderlay and 25mm deepcounterbattens installed

Provide Decra Eave Mesh withfree airflow of 25,000mm2 perlinear metre.

Level with top edge of rafter ortop edge of insulation board.(If installation boards are installed)

N/A

Install Decra 700 HighPerformance Breathermembrane on top of rafters andunder counterbattens.

Decra Warm Roof Eave Guardinstalled under Decra 700 HighPerformance Breathermembrane. Use of Decra eavemesh & Decra Eave closureflashing recommended.

Decra KS1000TSWarm roofsystem

Provide mesh withfree airflow of25,000mm2 perlinear metre.

N/A

N/A

Install Eave battenthe same size astile batten installedbehind fascia.board.

N/A, Use of mesh& Decra Eaveclosure flashingrecommended.

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Eaves with continuous ventilation

FIXINGAll Decra Tile systems:

1. First batten

Fix the first batten at dimension to suit roof

pitch and/or type of gutter.

See Table 2 below for maximum allowable

dimension (A).

If eaves ventilation pack not being used:

Fix top of fascia to same height as top of tile

battens.

Decra Oberon Tile:

Fit tilting fillet, as shown.

2. Fascia board

Fix Fascia board, allowing for the extra

depth of the Over Fascia Ventilator -

For Eaves Pack 10mm:

Fix fascia board 15mm below the line of top

face of eaves batten.

For Eaves Pack 25mm:

Fix fascia board 25-30mm below the line of

top face of tile batten.

3. Over Fascia Ventilator

Fix the Over Fascia Ventilator to top of the

fascia board.

The drawings above illustrate typical construction details, and are selected from Decra’s extensive library of details showingmany alternative constructions. If the construction you need is not shown here, please see www.decra.co.uk

370mm

330mm max

This dimension is v

ariable

determined by pitch and

gutter sectio

n

370mm

Decra Classic

Gutter

Decra Underlay/Decra Breather membrane as appropriate

Top, outer edge, of fasciaboard to be fixed 25mmbelow batten height

Tiling Battens, size determined by rafter spacing, refer to technical brochure

50 x 25mm tile batten as eavesfixing point, min 20mm gap betweenbatten and ventilator

Decra Eave Guard 400draped into gutter

30 degreeroof pitch illustrated

Battens illustrated 50 x 25mm for rafter/truss spacing of 600mm

Decra Continuous Rafter Roll ventilator

Gutter spacingbracket

Decra 25mm over fasciaeaves ventilator

Decra Underlay/breather membrane finished in line with edge of fascia, secured with galvanised clout headed nails at 300-400mm centres to the first tiling batten

Decra Eave Guard 400. Eave Guard kept 10mm min clear of front edge of second batten.

Decra Classic – greater than 15º roof pitch Detail from DTSE017

Gutter

This dimension is v

ariable

determined by pitch and

gutter sectio

n

280 approx

Continous rafter roll

Top, outer edge, of fascia board to be fixed 30mm below batten height

Decra Eave Guard 370 draped into gutter

Battens illustrated 50x25mm for rafter/truss spacing of 600mm

Decra 25mm Over Fascia Ventilator

Gutter Spacing Bracket

Arris Rail set 20mm from back edgeof fascia board to give clear ventilation

Decra Eave Guard 370 fixed with one 40-50m galvanised clout head nail at each rafter intersection, minimum 10mm from back edge of Eave Guard. Eave Guard kept 10mm min clear of front edge of second batten

The bottom course of Decra Plain Tiles to be secured with four Decra nails driven vertically to the Arris Rail at the high point of the tile profile at a position below the intermediate step of the tile Nail heads to be sealed using a Decra finishing kit

With 50x25mm battens fit 200x25mm (finished size) continuous Arris Rail to give support to Decra Eave Guard and underlay, and as eaves support for tiles

Decra Underlay/breather membrane finished in line with edge of fascia, secured with galvanised clout headed nails at 300-400mm centres to the Arris

Oberon – greater than 15º roof pitch Detail from DPTE017

Decra Eaves Guard

Extremely durable eaves protection system.

More durable than roof underlay, Decra

Eaves Guard prevents internal leakage and

consequent rotting of rafter feet or soffits

See page 62 for further information.

Eaves Vent Pack

Each pack contains:

n 20 Over fascia ventilators

n 1 continuous rafter roll

n 7 Gutter bracket spacers

Sufficient for 6 linear metres of eave

Table 2 – First batten –

Maximum dimension

Decra system A (Max.

Dimension) mm

Decra Classic, Elegance

Plus Tile & Parctile 330mm

Decra Oberon Tile

& Decra Stratos 280mm

Applies to Classic – Similar general principles of construction also apply to:

Decra Plus Tile, Stratos, Elegance and Parctile.

4. Rafter Roll

Roll out continuous rafter roll over rafters

and position so as to keep the roofing

underlay separate from the insulation below.

Secure to rafters with felt nails through the

circular indentations in the continuous rafter

roll (2 nails at every rafter intersection).

5. Gutter Bracket Spacers

Insert the Gutter Bracket Spacers behind

the gutter brackets during the fixing of the

guttering system.

NOTE: It is essential to use the spacers in

order to obtain the optimum flow of air into

the ventilator.

6. Decra Eaves Guard

1. Lift front edge of roofing underlay and fold

out of the way to make temporary clearance

to install the Decra Eave Guard.

2. Fold front edge of Decra Eave Guard

down at first crease line (see fig 1).

3. Locate Decra Eave Guard in place,

keeping rear edge of Eave Guard at least

10mm clear of batten 2 (see fig 2).

IMPORTANT NOTE: Decra Eave Guard has a front andback edge (see Fig 1). It is essential that the Decra EaveGuard is installed the right way around with the front edgedraped into the gutter and with the textured surface on top.

4. Secure rear edge of Decra Eave Guard

with one 40mm - 50mm galvanised clout

headed nail per each rafter intersection (see

fig 2). Nails should be located 10mm in from

back edge of Eave Guard. Take care to pull

Eave Guard taunt across rafter gap,

ensuring that Eave Guard doesn’t sag.

5. Pull front edge of Eave Guard taunt and

secure front edge of Decra Eave Guard to

eave batten with one clout headed nail per

each end .

6. Lap each length of Eave Guard 100mm

over the next at side. Ensure all side laps

occur over a rafter intersection (see fig 3).

7. Install double sided buytl adhesive strip

along length of Eave Guard side lap (see

fig 3). Note: the adhesive strip can be found

inside Eave Guard pack. Push down on side

lap to ensure the laps of Eaves Guard are

fully sealed by the adhesive.

RE-FIT UNDERLAY

8. Fold front edge of roofing underlay from

its temporary position back into its correct

normal position at eaves and pull front edge

of underlay taunt to ensure that ponding

cannot occur behind rear edge of Eave

Guard.

9. Secure front edge of underlay at 300mm -

400mm centres with galvanised clout

headed nails to the eave batten (see fig 2)

previously installed.

INSTALL THE TILES

10. Install the Decra tiles. Secure the bottom

course of tiles with four Decra fixing nails or

screws driven vertically, close to the high

point of the tile profile, into the eaves batten

underneath (see fig 4). Seal these nail heads

using Decra finishing kit.

NOTE: For installation of underlay,

see page 75

Sitework see page 130

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Fig 1 Fig 2

Fig 3 Fig 4

NOTE: The fixing instructions above are indicative of typical installation procedures, and are provided to illustrate general principles and procedures only. For specific constructions, alwaysrefer to Decra detail drawings and current codes of practice.

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Tile ventilator – Design

Soil and Mechanical Extract

The DecraVent tile vent can also be used as

a weather-protected exit point for soil pipes

or extractor fan ducts. Connection to

100mm diameter stacks or ductwork is by

means of a separately available adaptor and

flexible hose.

The vents offer an airflow resistance of 32.7

pascals at 100m3/hr flow rate. To comply

with Part H of the Building Regulations and

the Building Standards (Scotland)

Regulations 1990, DecraVent Tile Vents

used for soil stacks should be sited at least

900mm above any opening into the building

within three metres. All connecting pipework

should be insulated.

SETTING OUT

For high level ventilation:

Install vents at recommended centers on

the second course down from the ridge or

top edge. See chart opposite.

FIXING

1. Locate the position of the Tile Vent

extension pipe on the underlay.

Decra Oberon Tile only:

Cut away small section of intermediate tile

batten which fouls the underside tray of the

Oberon Tile Vent, allowing Vent to seat

properly on the battens.

2. Remove Tile Vent and cut underlay,

folding flaps upwards and outwards.

3. Cut a 340mm horizontal slit about

100mm above the opening created. Place

flat end of the Opening Protector into the slit

and locate the upstand end above the

opening in the underlay.

4. Fit Tile Vent following normal Decra tiling

procedure.The drawings above illustrate typical construction details, and are selected from Decra’s extensive library of details showingmany alternative constructions. If the construction you need is not shown here, please see www.decra.co.uk

DecraVent tile vents are manufactured

from UV stable PVC and are colour-

matched using the same stone granule

finish as the Decra roofing system.

The DecraVent Opening Protector is

extremely efficient and effectively deflects

any ingress of external water away from the

hole made in the underlay. Decra tile vents

can be used in roof spaces interrupted by

compartment walls or where effective cross

ventilation is difficult to achieve, such as

parapet, mansard and mono-pitch

constructions.

DecraVent tile vents for Classic, Elegance,

Oberon Tile, Plus Tile and Parctile have an

airflow of 10,000mm2.

Pack contents

n One tile vent

n One opening protector

Order flexible extension hoses and adaptors

separately

370mm

Dimension is variable

50

Decra Classic

Tiling battens

Roofing Felt

Decra Inline Vents spaced at intervals to provide ventilation of5000sqmm per lin/metre run

Opening Protector

Decra Classic – Tile Ventilator Detail Detail from DTSE040

Roofing Felt

Decra Pantiles

Tiling Battens, size determined by rafter spacing, refer to

technical information brochure.

Soil Vent Pipe Through Roof

Weather collar to pipe to cover lead flashing

Lead flashing around pipe dressed down over tile and up over upstand to tile joint

Opening Protector

Insulate Soil-Vent pipe depending on situation and regulations requirements

Soil-Vent pipe and flexi-pipe to be insulated

Additional 100mm diameter flexihose for connection to Soil Vent Pipes or Mechanical Extractors. Decravent airflow 32.7 Pascals at 100 cubic metres/hr flowrate.

Decra underlay or Decra breather Membrane appropriate

Tiling Battens, size determined by rafter spacing, refer to technicalinformation brochure.

Ventilation tile fitted in accordancewith installation instructions.

Decra Classic – Decra InLine Tile Ventilator to Soil Vent Pipe Detail from DTSE062

Applies to: Decra Classic, Elegance, Plus Tile and Parctile

Applies to: Decra Classic, Elegance, Plus Tile and Parctile

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Tile ventilator – Installation

5. Insert the extension spigot into the roof

space, ensuring the three underlay flaps are

facing upwards.

Decra Classic, Elegance, Plus Tile,

Decra Stratos and Parctile:

6. Fix the Tile Vent into position by

overlapplng a standard Decra tile on either

side. Nail through the nose of the tiles

immediately adjacent to the Vent once the

course below the Vent has been installed.

Do not nail through the nose or upstand of

the Vent.

Decra Oberon Tile:

6 (A). Fix left hand side of Vent

Overlap a standard Oberon Tile over the

vent. Nail through the nose of the

overlapping tiles immediately adjacent to the

Vent after installation of the course below

the Vent.

Drive Decra fixing nails through the bottom

downturned nose of the tile and through the

intermediate step of the downturned nose of

the tile into the face of the battens. Do NOT

nail through the nose or upstand of the Vent.

6 (B). Fix right hand side of Vent

Overlap Vent over the top of the left hand

side of a standard Oberon Tile. Nail through

the two pre-formed nail holes in the Vent tile

and through the nose of the standard

Oberon Tile into the face of the battens. Do

not form new holes in the Vent - use only

the two nail holes provided.

If connecting to soil or mechanical extract:

7. Fit the DecraVent Pipe Adaptor. Then

connect the Flexible Extension Hose from

the Pipe Adaptor to the soil or mechanical

extraction stack using jubilee clips provided.

Ensure all pipework is insulated.

IMPORTANT NOTEDo not use vents as exit terminals for hot combustiongases.

Positioning tile vents

The exact positioning of tile vents to achieve

the ventilation requirements is determined by

the module size of the respective roof

covering. Additional staggering of roof vents

may occasionally be necessary to prevent

the underside of the vent fouling rafters or

fire walls.

Number of ventilators required

To achieve ventilation of Decra Classic and Elegance Decra Stratos/ Oberon tile Parctile

5,000mm2 per linear metre 1 vent per 1 full tile + 1 vent per full tile along 1 vent per full tile + 3 pan section

(high level ventilation) 2 pan section of tile the length of the roof of tile along the length of the roof

along the length of the roof

10,000mm2 per linear metre 1 vent alternating with a 1 vent per full tile, staggered in 1 vent alternating with a

4 pan section of tile along 2 courses along the length 4 pan section of tile along the

the length of the roof of the roof length of the roof

25,000mm2 per linear metre Use 25mm Decravent Use 25mm Decravent Use 25mm Decravent

(low level ventilation below Eaves Ventilation System Eaves Ventilation System Eaves Ventilation System

15° or with insulation at in lieu of tile vents* in lieu of tile vents* in lieu of tile vents*

rafter level)

* wherever possible, if not possible install the equivalent of two and a half tile vents per every linear metre at as evenly spaced centres as are possible


VentFull tile (7pans)

2 pansection


3 pansection

VentTile

Vent4 pan

sectionVent Vent4 pan sectionVentTile

VentTile


2 pansection


3 pansection

VentTile

Vent4 pan


VentTile


2 pansection


3 pansection

VentTile

Vent4 pan


VentTile


2 pansection


3 pansection

VentTile

Vent4 pan


VentTile


2 pansection


3 pansection

VentTile

Vent4 pan


VentTile


2 pansection


3 pansection

VentTile

Vent4 pan


VentTile

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Verges/Gables – Design

The drawings above illustrate typical construction details, and are selected from Decra’s extensive library of details showing many alternative constructions. If the construction you need is notshown here, please see www.decra.co.uk

Tile Batten

Soffit

Barge Board

Decra Underlay or Decra Breather Membrane as appropriate

Gable Ladder

Decra Top Course (optional) to encase timber barge board.

Tile bent to form 25mm upstand against batten and 50mm wide flange across top of batten

50 x 25mm continuous batten fixed to tiling battens, outside edge flush with barge board

End of tiling battens flush with outside edge of barge board

Underlay taken over top of barge board, dressed down outer face 25mm and tacked in place

DECRA PANTILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PANTILE

VERGE DETAIL USING

1:10 12/01/04

DTSE049

Roof Systems Limited


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX

email: [email protected]

web-Site: http://www.decra.co.uk

The copyright of this drawing anddetail information belongs to DecraRoof Systems Limited. Reproductionor amendment outwith the terms ofthe licensing agreement by otherparties is expressly forbidden.

telephone: (01293) 545058/9

fax: (01293) 562709

DECRA CLOAKED VERGE CAP

Decra Cloaked Verge Cap fixed with two Decra Nails, through the downturned edge of the cloaked verge and halfway down the top face through the top edge of the 25mm tile upstand.

Decra Cloaked Verge Cap fixed with two Decra Nails, through the downturned edge of the cloaked verge and halfway down the top face through the top edge of the 25mm tile upstand.

Decra Classic – Cloaked Verge detail DTSE049

Tile Batten

Roofing Felt

Decra Stratos Tiles

Rafte

r

Barge Detail

Scale 1:10

Tile turned up 38mm against 50 x 38mm batten

Stratos Barge cover withone Decra Nail fixed fourtimes on the side and threetimes on the downturn leg

Barge Board

50

First course of tilesfrom gable ends to be cut torandom lengths

85

135

Decra Stratos – Barge detail DSTE050

Tile Batten

Tile turned up 25mm against barge board

Barge BoardDecra Top Course(optional) to encase timberbarge board.

Roofing Felt Decra Classic

Rafte

r

Decra Barge Cover (handed) fixed three times on the side and three times on the top surface. Nail heads on top surface to be finished with Decra Finishing Kit.

Decra Classic – Barge detail DTSE050

Tile Batten


Barge BoardRoofing Felt

Decra Plain Tiles

Rafte

r

First course of tiles from gable ends to be cut to random lengths

50 x 25mm edge batten

50 x 19mm batten

Decra Plain Tile Ridge/Barge capfixed with one Decra Nail on eachside of the ridge cap near the end lap.Cap dressed down over tile upstand.

Decra Oberon – Barge detail DPTE051

Tile Batten

Barge Board fitted flushwith top of battens

Roofing Felt

Decra Plus Tile

Rafte

r


110

110

Decra D type Box Barge (handed)fixed four times on each side.Nail/Screwheads on top surfaceto be finishedwith Decra Finishing Kit.

Decra Plus – Barge detail DPSE052

Decra Stratos Barge Cover

Applies to: Decra Stratos tile

Length of cover: 1200mm

Cloaked Verge Cap

Applies to: Decra Classic &

Elegance


Offers a softer, more natural

transition from tile to gable

which more closely resembles

traditional roofscapes.

Scribed Barge Cover

Applies to: Decra Classic, Parc tile, Elegance


Ridge/Barge Cap

Applies to: Decra Oberon tile


D Box Barge Cap

Applies to: Decra Plus tile


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Verges/Gables – Installation

Decra Classic, Decra Elegance

Using Cloaked Verge Cap

1. Install bargeboard level with bottom edge of

tile battens. Underlay should over sail the edge

of bargeboard by 25mm and should be turned

down the outer face of the barge board and

tacked into place.

Ensure cut ends of the tile battens are in line

with the outer edge of the bargeboard.

Install 50mm x 25mm treated gable runner

batten secured on top of the tile battens (outer

edge of gable runner batten to be in line with

outer face of bargeboard).

2. Cover bottom edge of bargeboard with

cloaking piece of Decra (this can be cut from a

piece of Decra top course or ridge cap).

3. Decra tiles to be cut and bent to form a

75mm flange, first 25mm flange to upstand

against gable runner batten, remaining 50mm

of flange to be dressed down flat forming a

cover over the top face of gable runner batten.

4. Install Decra Cloaked Verge Cap on top of

tile flange (i.e. over the gable runner battens)

and secure with two Decra fixing nails:

The first nail driven through the downturned

edge of the Decra Cloaked Verge Cap into the

barge board.

The second nail skew fixed half way down the

top face of the Decra Cloaked Verge Cap

through the top edge of the 25mm upstand

flange into the underlying gable runner batten.

The heads of vertical nails should be sealed

using a Decra finishing kit.

Decra Classic, Parctile

Using Scribed Barge Cover

1. Install bargeboard so that it projects 25mm

above the top of the tile battens.

2. Secure Decra Scribed Barge Cover with

3-no. Decra fixing nails driven through the

downturned edge of the cover into the

bargeboard.

3. Drive 1-no. Decra nail vertically through the

Barge Cover into each of the battens.

4. Seal heads of vertical nails using Decra

Finishing Kit.

Decra Stratos

Using Decra Stratos Barge Cover

1. Install bargeboard so that it projects 50mm

above the top of the tile battens.

2. Install 50mm x 38mm treated gable runner

batten, secured on top of the tile battens,

against the internal face of the bargeboard.

3. Cut first course of tiles from gable end to

random lengths. Ensure the pattern of the

profile of the tile does not appear repeatedly in

the same vertical position up the rafter slope.

4. Cut and bend tiles (using Decra guillotine

and bender) to form a 38mm upstand against

the 50mm face of the gable runner batten.

5. Position Decra Stratos Barge Cover over

gable runner batten and bargeboard and

secure with;

i) 4-no. Decra fixing nails driven into vertical

face of the bargeboard.

ii) 4-no. Decra fixing nails driven into gable

runner batten.

6. Seal heads of vertical nails using Decra

Finishing Kit.

NOTE: Decra Stratos Barge Covers are handed and tapered toallow for laps. Overall length of Barge Cover 1280mm, lapeach Barge Cover 80mm to provide 1200mm overall length ofcover

Decra Oberon Tile

Using Ridge/Barge Cap (320mm length)


batten, secured on top of the tile battens,

against the internal face of the bargeboard.


batten to external face of bargeboard.

3. Cut first course of tiles from gable end to

random lengths. Ensure the pattern of the

profile of the tile does not appear repeatedly in

the same vertical position up the rafter slope.

4. Cut and bend tiles (using Decra guillotine

and bender) to form a 25mm upstand against

gable runner batten.

5. Position Ridge/Barge Cap over gable runner

battens and secure with 1-no. Decra fixing nail

on each side of the Ridge/Barge Cap near the

end lap.

Decra Plus Tile

Using ‘D’ type Box Barge Cap

1. Install bargeboard so that the top is level

with top of rafters.

2. Install 2-no. 50mm x 38mm treated gable

runner battens;

i) secured on top of the tile battens parallel

to the barge board.

ii) secured to external face of bargeboard

Position both gable runner battens to suit

the fitting of a Decra 0.9mm ‘D’ type Box

Barge Cap.

3. Cut and bend Decra Plus tiles (using Decra

cutting blade ) to form a 38mm upstand

against gable runner batten.

4. Place Decra 0.9mm ‘D’ type Box Barge Cap

over gable runner batten and secure with 4-no.

Decra Plus tile nails on each side. (Pre-punch

‘D’ type Box Barge Cap at nail positions using

Decra Tile Punch).

NOTE: Decra D Box Barge Caps are tapered to allow for laps.Overall length of ridge cap 1280mm, lap each ridge cap 80mmto provide 1200mm overall length of cover.”

NOTE: The fixing instructions above are indicative of typical installation procedures, and are provided to illustrate general principles and procedures only. For specific constructions, always refer to Decradetail drawings and current codes of practice.

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Abutments – Design

Side Abutments

Using lead flashing

The Decra tile is turned up to form an

upstand against the wall and

weatherproofed with a lead cover flashing

(See detail below).

Using scribed Side Flashing

A Scribed Side Flashing is available for use

with Decra Classic, Parctile and Elegance

systems. The Flashing may also be used

with Decra Plus Tile, but it is available in

standard gauge only so does not offer the

same standard of vandal resistance as

Decra Plus.

Top Edge and Chimney Abutments

Top Edge (Classic, Decra Stratos,

Parctile, Elegance, Oberon Tile)

Unventilated top edge abutments are

generally formed with a 75mm tile upstand,

covered with a lead flashing. Ventilated top

edge details are generally formed by

incorporating a Decra Top Course flashing

and appropriate ridge ventilator in to the

design (See detail opposite).

Decra Plus Tile

A different arrangement is required for Decra

Plus tile, using a 0.43mm gauge top course

flashing (See detail opposite).

Chimney Back Gutters

The back gutter arrangement shown

opposite is suitable for all Decra tile profiles

except Decra Oberon Tile.

For Decra Oberon Tile, install layboards

between rafters and tilting fillet against arris

rail to form an upstand for the lead gutter

(See detail opposite).

Decra Classic

Tile Batten

Roofing Felt

50mm minimumclear ventilated space

Cavity Tray (if existing or if required).

Decra Classic turned up 75mm minimum at edge to lap with Side Flashing.

Roofing felt turned up behind tile upstand

Lead flashing (by others) dressed in below Cavity tray if used and down over Decra Tile upstand.


Decra Classic – Abutment detail using lead flashing Detail from DTSE0071


Decra Oberon, Plus Tile, Stratos, Elegance and Parctile.

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Abutments – Design

Chimney

Lead Tray/Chimney DPC

Lead Flashing

Rafter


Lead Flashing

75Decra Classic

Roofing Felt

Tile Batten

Noggins between rafters to support timber layboards

Lead back gutter supported on timber board on timber fillets, and layboards fitted between rafters

Note: Flue diameter and thickness of brickwork to comply with building regulations requirements. Thicknesses shown are indicative


Decra Classic – Abutment detail Detail from DTSE0061

Decra Plus Tile – Top edge abutment chimney detail DPSE061

Chimney


Lead Flashing

Rafter


Lead Flashing

7575

Decra Plus Tiles

Roofing Felt

Tile Batten

Decra 0.43mm Gauge top course bent to form 75mm upstand

Decra D Ridge sealing strip attached to the underside of 50x25mm batten

Lead back gutter supported on timber board on timber fillets, and layboards fitted between rafters

Noggins between rafters to support timber layboards

Note: Flue diameter and thickness of brickwork to comply with building regulations requirements. Thicknesses shown are indicative

Decra Oberon – Back gutter to chimney detail DPTE061

Decra Plain Tiles fixed with Decra Nails

Tile battens, minimum thickness 25mm, at 160mm

spacings, fixed to rafters with galvanised wire nails length

and gauge determined by size of tile batten and rafter

spacings (see table in technical brochure).

Chimney


Lead Flashing

Lead back gutter supportedon timber board on timber fillets

Rafter


Lead Flashing

75

Decra Plain Tiles

Roofing Felt

75mm Upstand to tile

Tile batten min

25mm thick

Note:

Flue diameter and thickness of brickwork to

comply with building regulations requirements.

Thicknesses shown are indicative

Bottom Course nailed four timeswith Decra nails through to ArrisRail. Nail heads to be sealedusing a Decra finishing kit.

Continuous Arrisrail/Tilting fillet alongupper edge of gutter

Layboards between rafters andtilting fillet against arris rail to formupstand for lead gutter. Leaddressed up over arris rail

DECRA PLAIN TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLAIN TILE

CHIMNEY FLASHING DETAILS

1:10 5/10/98

DPTE061

The copyright of this drawing and detail information belongs to Decra Roof Systems (UK) Ltd.

Reproduction or amendment outwith the terms of the licensing agreement by other parties is expressly forbidden.

Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:

http://www.decra.co.uk

Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX



94

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Abutments – Installation

Side abutmentsUsing lead flashing

Suitable for use with all Decra Tiles

1. Turn underlay min. 75 mm up abutment.

2. Cut and bend tiles not less than 75 mm

up abutment.

3. Form weathertight junction with lead step

flashing.

Using Decra Scribed Side Flashing

Decra Classic, Plus Tile and Parctile

only

1. Turn underlay min. 75 mm up abutment.

2. Cut and bend tiles not less than 75mm

up abutment and fix tiles close to abutment.

3. Turn Decra Scribed Side Flashing not less

than 75 mm up abutment and secure to

vertical upstand with appropriate fasteners.

4. Drive 1-no. Decra nail vertically through

the scribed side flashing into each of the

battens.

5. Seal heads of nails/screws with Decra

finishing kit.

6. Form weathertight junction with lead step

flashing.

NOTE: Decra Oberon Tile and Decra Stratos.

Cut first course of tiles from abutment wall to randomlengths so that the profile of the tile does not appearrepeatedly in the same vertical position up the rafter slope.

Top edgeabutmentsDecra Classic, Parctile, Decra Stratos

and Elegance (Unventilated)

1. Ensure underlay/breather membrane is

turned not less than 75 mm up abutment.

2. Install intermediate batten to secure top

tile course close to junction with abutment.

3. Cut and bend tiles not less than 75 mm

up abutment.

4. Secure tiles to top batten with Decra

fixing nails.

5. Seal heads of nails with Decra

finishing kit.

6. Dress lead flashing over tile upstand and

front apron area to form weathertight

junction.

Decra Oberon Tile (Unventilated)


turned not less than 75 mm up abutment .

2. Install battens so that top batten adjacent

abutment supports supports bottom edge of

top course tile.

3. Cut and bend top course of tiles not less

than 75 mm up abutment.

4. Secure bottom edge of top course of tiles

to top batten with Decra fixing nails.


finishing kit.

6. Dress lead flashing over tile upstand and

front apron area to form weathertight

junction.

Decra Plus Tile (Unventilated)

0.43mm top course flashing


turned not less than 75 mm up abutment.

2. Install 2-no. 50 x 25mm battens to

support head of top course of 0.9mm gauge

tiles.

3. Install top course of 0.9mm gauge tiles

4. Position 50 x 25mm batten, with Decra

Sealing Strip attached to the underside,

onto the head of the top course 0.9mm

gauge tiles. Secure by nailing through tile

into batten below.

5. Cut and bend 0.43mm gauge top course

flashing not less than 75mm up abutment.

6. Secure bottom edge of top course of tiles

to top batten with Decra fixing nails.


finishing kit.

8. Dress lead flashing over top course

flashing upstand and front apron area to

form weathertight junction.

Ventilated Top Edge using D ridge vent

filler

Applies to: Decra Classic, Parctile and

Elegance

1. Cut the roofing felt back at the top edge

to allow a 5mm continuous air gap at

abutment. Fit two battens side by side on

both sides of the ridge using galvanised nails.

2. Cut, bend up and fix tiles close to the

abutment and maintain airgap. Place the

Ridge Vent Filler on the top course of tiles.

Position it so that, once installed, its lower

edge will fit tightly against the downturn of

the Decra top course flashing. Lay a batten,

not exceeding 50 x 25mm, into the tray of

the Ridge Vent Filler and secure by nailing

through the Filler and tile into the battens on

the underside.

3. Cut and bend Decra top course flashing

to form a turn up of at least 75mm up

abutment. Fix Decra top course flashing

over the top batten by nailing through its

downturn into the face of the batten. Use 4

Decra nails.


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Abutments – Installation

flashing upstand and over front apron area

to form weathertight junction.

Ventilated Top Edge using Universal

Ridge/Hip Ventilator

Applies to: Decra Classic, Stratos and

Parctile



abutment. Fix two tiling battens 50 x 25mm

side by side approximately 10mm back from

abutment, using galvanised nails. Fix an

additional 50 x 25mm batten on top of the

rearmost of the two tiling battens, in a

position to suit the fitting of the top course

flashing unit.

2. Turn back edge of the tile up to form 25 –

38mm upstand against the top tiling batten.

3. Cut and bend Decra D ridge to form a

top course flashing unit with a front edge

downturn of 40mm and forming a rear

upstand of at least 75mm up abutment.

Position top course flashing unit over the top

batten and upstand edge of tile. Install

universal ridge/hip ventilators between

upturned back edge of tile and front

downturned edge of top course flashing

unit.

4. Fix top course flashing unit over the top

batten by nailing through its downturn into

the face of the batten. Use 4 Decra nails.




Applies to Oberon

As for ventilated top edge using Universal

Ridge/Hip Ventilator, BUT

Use Oberon top course flashing in lieu of

adapting Decra D ridge.

Applies to: Decra Plus Tile



abutment. Fix two tiling battens 50 x 25mm

side by side on both sides of ridge, using

galvanised nails.

2. Cut tile and fix tiles close to the abutment

and maintain airgap. Secure top course of

tiles using 4 Decra Plus nails/screws driven

through the downturn nose of the top

course into the battens.

3. Nail additional 50 x 25mm batten, with

Decra ‘D’ Ridge sealing strip attached to

underside, onto the tile in a position to suit

the fitting of the top course flashing unit.

4. Cut and bend 0.43mm Decra D ridge to

form a top course flashing unit with a front

edge downturn of 40mm and a rear upstand

of at least 75mm up abutment. Position top

course flashing unit over the top batten and

upstand edge of tile. Install universal

ridge/hip ventilators between the additional

50 x 25mm batten and front downturned

edge of top course flashing unit. Fix top

course flashing unit over the top batten by

nailing through its downturn into the face of

the batten. Use 4 Decra nails vertically into

batten and seal with Decra finishing kit.




Back Gutter Detail

All tile systems EXCEPT Decra Oberon

Tile:

1. Install noggins between rafters to support

timber layboards.

2. Fit layboards between rafters.

3. Install timber board on timber fillets to

support lead back gutter.

4. Install Code 5 (min.) lead to form gutter.

Provide min. 75mm upstand to back edge

of chimney wall, with lead cover flashing

dressed over.

5. Dress lead over last batten supporting

bottom of last tile.

6. Nail bottom course of tiles vertically

through to batten

7. Seal heads of nails with Decra finishing kit

Decra Oberon Tile:

1. Fit layboards between rafters, and tilting

fillet against wall to form upstand to gutter.

2. Install timber board on timber fillets to

support lead back gutter.

3. Install arris rail size 200 mm x thickness of

tiling battens (maximum), fixed in lieu of first

tiling batten to provide support for

intermediate step in first course of tiles

above back gutter.

4. Install Code 5 (min.) lead to form gutter.

Provide min. 75mm Upstand to back edge

of chimney wall, with lead cover flashing

dressed over.

5. Dress lead up over arris rail.

6. Nail bottom course of tiles vertically four

times through to arris rail.


finishing kit.


96

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Ridges - unventilated – Design

Dimension variable110

40

Decra 'D' Ridge sealing strip attached to the underside of 50x25mm batten

Dimension Variable

110

40

2 x 50 x 25mm battens

Decra 'D' Ridge sealing stripattached to the undersideof 50 x 25mm batten

High ridge of tile profile shown dotted


DECRA PLUS

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLUS

UNVENTILATED 'D' RIDGE DETAILS

1:5/10 14/02/01

DPSE020



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX

'D' Type Ridge Cap (1200mm cover length) suitable for roof pitches from 10˚ to 35˚ fixed four times both sides with Decra Plus Nails/Screws.

Top course of tiles cut to appropriate length 5mm short of ridge centre line using special Decra cutting blade

'D' Type Ridge Cap (1200mm cover length) suitable for roof pitches from 10˚ to 35˚ fixed four times both sides with Decra Plus Nails/Screws

Decra Plus – Ridge using D Ridge DPSE020

Half Round Ridge, 403mm cover, suitable for roof pitches from 10˚ to 45˚. Fixed with one Decra Nail to each side of the ridge cap near the end lap.

50x25mm batten

Decra Elegance

Tiling battens, size determined by rafter spacing

370mm

Dimension Variable

Decra Pantile turned up 25 to 38mm against face of batten

Dimension Variable

Half Round Ridge Detail

Scale 1:5

50x25mm batten

Decra Elegance tile turned up 25 to 38mm against face of batten

2x50x25mm battens

Half Round Ridge, 403mm cover, suitable for roof pitches from 10˚ to 45˚. Fixed with one Decra Nail to each side of the

ridge cap near the end lap.

Membrane as appropriate

Decra Underlay/Decra Breather

DECRA ELEGANCE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA ELEGANCE

UNVENTILATED HALF ROUND RIDGE DETAILS

1:5/10 5/10/98

DESE024

Notes:

fax: (01293) 562709

telephone: (01293) 545058/9

parties is expressly forbidden.the licensing agreement by otheror amendment outwith the terms ofRoof Systems Limited. Reproductiondetail information belongs to DecraThe copyright of this drawing and



RH10 9PX

West Sussex

Crawley

Faraday Road

Faraday Centre

Unit 3



The scales indicated on this drawing refer to the scales the details will be at whenprinted out on an A4 sheet using portrait orientation. In Autocad/Intellicad the main detailis at a scale of 1:1 with any others proportionately larger or smaller.

Decra Elegance – Ridge using Half round Ridge DESE024

110

40

Dimension variable

Stratos D type Ridge Cap (1200mm cover length)suitable for roof pitches from 12˚ to 35˚. Fixed four times with Decra Nails

50 x 38mm battensTile turned up 38mm against tile batten

Stratos D type Ridge Cap (1200mm cover length) suitable for roof pitches from 12˚ to 35˚. Fixed four times with Decra Nails

50x38mm battens

Decra Stratos Tiles turned up 38mm against tile batten

Tiling battens, minimum thickness 38mm, size determined by rafter spacing

Roofing Felt

DECRA STRATOS TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA STRATOS TILE

'D' RIDGE DETAIL UNVENTILATED

1:10/1:5 5/10/98

DSTE021



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX

Decra Stratos – Ridge using D Ridge DSTE021

Plain Tile Ridge/Barge Cap 370mm cover suitable for roof pitches from 15˚ to 45˚. Fixed with one Decra Nail each side of the barge cap near the end lap

Dimension variable

25x50mm battens

Tile turned up 25mm against edge of batten

Roofing Felt

Decra Oberon Tiles

Tiling battens, minimumthickness 25mm, sizedetermined by rafter spacing

25 x 50mm battens

DECRA PLAIN TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLAIN TILE

UNVENTILATED RIDGE DETAIL USING

RIDGE/BARGE CAP 370mm COVER

1:5/1:10 5/10/98

DPTE020



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX

Oberon Tile Ridge/Barge Cap 370mm cover suitable for roof pitches from 15˚ to 45˚. Fixed with one Decra Nail each side of the barge cap near the end lap

Tile turned up 25mmagainst edge of batten

Decra Oberon – Ridge using Ridge/Barge Cap DPTE020

'D' Type Ridge Cap (1200mm cover length)suitable for roof pitches from 10˚ to 35˚ fixedfour times both sides with Decra Nails

50 x 25mm batten

Dimension Variable 110

40

Decra Classic Tile turned up25 to 38mm against face of batten

Dimension Variable

110

40

50x25mm batten

Decra Pantile turned up 25 to 38mm against face of batten

2x50x25mm battens

DECRA PANTILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PANTILE

UNVENTILATED 'D' RIDGE DETAILS

1:5/10 5/10/98

DTSE020



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX

'D' Type Ridge Cap (1200mm cover length) suitable for roof pitches from 10˚ to 35˚ fixed four times both sides with Decra Nails

Decra Classic – Ridge using D Ridge DTSE020

Applies to Classic – Similar general principles of construction also

apply to: Parctile.


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Ridges - unventilated – Installation

‘D’ Ridge CapApplies to: Decra Classic, Parctile

1. Fix two tiling battens 50 x 25mm side by

side on both sides of ridge, using galvanised

nails.

2. Fix an additional 50 x 25mm batten on

top of the rearmost of the two tiling battens,

in a position to suit the fitting of the ‘D’

Ridge Cap.


38mm upstand against the top tiling batten

4. Secure each tile using 4 Decra Nails

driven through the downturn nose of the tile

into the battens.

5. Fit Ridge Cap over the top batten and nail

through downturn into the tile upstand and

face of the batten using 4 Decra Nails on

each side.

6. For ridge end termination fit ‘D’ Ridge

End Closure Unit.

NOTE: Decra D Ridge Caps are tapered to allow for laps.Overall length of ridge cap 1280mm, lap each ridge cap80mm to provide 1200mm overall length of cover.

NOTE: Where roof pitches exceed 35° it may be necessaryto adjust the return angle of the downturned leg of the DRidge Cap.

Applies to: Decra Stratos

n As above, but battens to be 50 x 38mm,

and tile upstand to be 38mm.

Applies to: Decra Elegance

As for Decra Classic BUT

n Half round Ridge used in lieu of D Ridge.

‘D’ Ridge CapApplies to: Decra Plus Tile



nails.

2. Cut top course of tiles to a dimension

which is 5mm less than the distance

between the ridge tree and the bottom edge

of the first course of tile battens below the

ridge.

3. Secure top course of tiles using 4 Decra

Plus Nails driven through the downturned

nose of the top course into the battens.


Decra ‘D’ Ridge Sealing Strip attached to

underside, onto the tile on each side of the

ridge in a position to suit the fitting of the

Decra 0.9mm ‘D’ Ridge Cap.

5. Fit Ridge Cap over the top batten and nail

through downturn into the tile upstand and

face of the batten using 4 Decra nails on

each side.

6. For ridge end termination fit ‘D’ Ridge

End Closure Unit.


NOTE: Where roof pitches exceed 35° it may be necessaryto adjust the return angle of the downturned leg of theD Ridge Cap.

Ridge/Barge CapApplies to: Decra Oberon Tile



nails.



in a position to suit the fitting of the

Ridge/Barge Cap.

3. Turn back edge of the tile up to form

25mm upstand against the top tiling batten.

4. Fit Ridge/Barge Cap over the top batten

and tile upstand and nail through each side.

of the Ridge/Barge Cap near the end lap

5. For ridge end termination fit Oberon Tile

End Cap.

NOTE: Decra Oberon Ridge/Barge Caps are tapered toallow for laps.

NOTE: Where roof pitches exceed 35° it may be necessaryto adjust the return angle of the downturned leg of theRidge/Barge Cap.


Decra UniversalRidge/Hip Ventilator

Dimension variable 110

40 Decra 'D' Ridge sealing stripattached to the undersideof 50 x 25mm batten

Dimension Variable

110

40

2x50x25mm battens

Decra 'D' Ridge sealing strip attached to the underside of 50x25mm batten

Felt cut short to give clear ventilation

Decra Universal Ridge/Hip Ventilator



felt & battenscut short to ensure

clear ventilation path

Top course of tiles cut to appropriate length 5mm short of ridge centre line using special Decra cutting blade

'D' Type Ridge Cap (1200mm cover length)suitable for roof pitches from 10˚ to 35˚ fixedfour times both sides with Decra Plus Nails/Screws

'D' Type Ridge Cap (1200mm cover length) suitable for roof pitches from 10˚ to 35˚ fixed four times both sides with Decra Plus Nails/Screws.

DECRA PLUS

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLUS

VENTILATED 'D' RIDGE DETAIL

USING UNIVERSAL D RIDGE VENTILATOR

1:10 14/02/01

DPSE021



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX

'D' Type Ridge Cap(1200mm cover length)suitable for roof pitchesfrom 10˚ to 35˚ fixedfour times both sideswith Decra Nails

50 x 25mm batten,Classic turned up 25mm to 38mmagainst face of Batten

Dimension Variable

4040

Felt & battens cut shortto ensure clear ventilation path

Decra UniversalRidge/Hip Ventilator

110110

DECRA PANTILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PANTILE

VENTILATED 'D' RIDGE DETAIL

USING UNIVERSAL D RIDGE VENTILATOR

1:10 5/10/98

DTSE021



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX

Ridge Detail

Scale 1:10

Dimension variable

Ridge Detail

Scale 1:5

25 x 50mm battens

Tile turned up 25mmagainst edge of batten

Ridge/Barge Cap

Isometric

Scale 1:10Roofing Felt


25x50mm battens Tile turned up 25mm against edge of batten

Decra Universal Hip and Ridge Ventilator

Decra Universal Hip and Ridge Ventilator

Felt & battenscut short to ensure

clear ventilation path

Felt cut short to ensure clear ventilation

DECRA PLAIN TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLAIN TILE

VENTILATED RIDGE DETAIL

USING RIDGE/BARGE CAP 370mm COVER

and DECRA UNIVERSAL HIP AND RIDGE VENTILATOR

1:5/1:10 5/10/98

DPTE021



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX

Oberon Tile Ridge/Barge Cap370mm cover suitablefor roof pitches from 15˚ to 45˚. Fixed with one Decra Nail eachside of the barge cap near theend lap

Plain Tile Ridge/Barge Cap 370mm cover suitable for roof pitches from 15˚ to 45˚. Fixed with one Decra Nail each side of the barge cap near the end lap

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Ridges - ventilated – Design

Decra Oberon – Ridge using Ridge/Barge Cap andUniversal Ridge Ventilator DPTE021

Decra Plus Tile– Ridge using D Ridge andUniversal Ridge Ventilator DPSE021

Decra Classic – Ridge using D Ridge andUniversal Ridge Ventilator DTSE021

'D' Type Ridge Cap(1200mm cover length)suitable for roof pitchesfrom 10˚ to 35˚ fixedfour times both sideswith Decra Nails.

50 x 25mm batten,Classic Tile turned up 25mm behind filler

Dimension Variable

40


Decra D RidgeVent Filler Unit

50 x 25mmbatten

DTSE022

Decra Classic – Ridge using D Ridge andD Ridge Vent Filler DTSE022


apply to: Parctile.


apply to: Parctile.


Ventilated 'D' Ridge Detail Scale 1:10

50 x 38mm battens

110

40

Dimension variable

Tile turned up38mm againstface of batten

Ventilated 'D' Ridge Detail Scale 1:5

Decra UniversalD Ridge Ventilator

Felt cut back at ridge minimum 10mm to allow clear ventilation to roof space.

Stratos D type Ridge Cap (1200mm cover length) suitable for roof pitches from 12˚ to 35˚. Fixed four times with Decra Nails.

50x38mm battens

Decra Stratos Tiles


Roofing Felt

Decra Universal D Ridge Ventilator


DECRA STRATOS TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA STRATOS TILE

D RIDGE DETAIL USING UNIVERSAL

D RIDGE VENTILATOR

1:10/1:5 5/10/98

DSTE022

Notes:



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX


Stratos D type Ridge Cap(1200mm cover length) suitablefor roof pitches from 12˚ to 35˚.Fixed four times with prec Decra Nails

DECRA TILETIMBERBRICKWORKINSULATIONBLOCKWORK PLYWOODBATTEN

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Ridges - ventilated – Design

Decra Stratos – Ridge using D Ridge andUniversal Ridge Ventilator DSTE022

50 x 25mm batten,Elegance Tile turned up 25mm behind filler

40


Decra D Ridge Vent Filler Unit50 x 25mm batten

Dimension Variable

DECRA PANTILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PANTILE

VENTILATED HALF ROUND RIDGE DETAIL

USING DECRA D RIDGE VENT FILLER UNIT

1:10 5/10/98

DTSE026

Notes:



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX


Half Round Ridge, 403mm cover, suitable for roof pitches from 10˚ to 45˚. Fixed with one Decra Nail to each side of the ridge cap near


Decra Elegance – Ridge using D Ridge andD Ridge Vent Filler DESE026


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Ridges - ventilated – Installation

‘D’ Type with DecraUniversal Hip/RidgeVentApplies to: Decra Classic, Parctile,


to allow a 5 mm continuous air gap on either

side of the ridge tree.



nails.



in a position to suit the fitting of the ‘D’

Ridge Cap.


38mm upstand against the top tiling batten

5. Position 'D' Ridge Cap over the top

batten and upstand edge of tile (See

illustration).

6. Pulling the bottom edge of ridge cap

away from the upstand edge of the tiles, slip

Universal Vent Strips into position on each

side of the 'D' Ridge (See illustration).

7. Install Universal Vent Strips continuously

throughout the whole length of the ridge on

both sides. Ensure there are no gaps

between each Strip.

8. Nail 'D' Ridge Cap through the downturn

of the cap into the tile upstand and face of

the top batten. Use 4 Decra nails on each

side.

9. For ridge end termination use ‘D’ Ridge

End Closure Unit.


NOTE: Where roof pitches exceed 35° it may be necessaryto adjust the return angle of the downturned leg of theD Ridge cap and use an alternative size of ridge fixingbatten.


n As above, but battens to be 50 x 38mm,

and tile upstand at ridge to be 38mm.



n As for ‘D’ Type ridge, BUT Half round

Ridge used in lieu of D Ridge.

Decra Oberon Tiles


to allow a 5mm continuous air gap on either




nails.



in a position to suit the fitting of the

Ridge/Barge Cap.

4. Turn back edge of the tile up to form

25 – 38mm upstand against the top tiling

batten.

5. Position Ridge/Barge Cap over the top

batten and upstand edge of tile (See

illustration).

6. Pulling the bottom edge of ridge cap


Universal Vent Strips into position on each

side of the Ridge/Barge Cap (See

illustration).

7. Install Universal Vent Strips continuously

throughout the whole length of the ridge on


between each strip.

8. Fit Ridge/Barge Cap over the top batten

and tile upstand and nail through each side

of the Ridge/Barge Cap near the end lap.

9. For ridge end termination fit Oberon Tile

End Cap.


Applies to: Decra Plus Tile

1. Cut the roofing felt back to allow a 5 mm

continuous air gap on either side of the

ridge.

2. Fix two tiling battens 50 x 25mm side be


nails.

3. Cut top course of tiles (with Decra special

cutting tool) to a dimension which is 5mm

less than the distance between the ridge

tree and the bottom edge of the first course

of tile battens below the ridge.


Plus Nails driven through the downturn nose

of the top course into the battens.




ridge in a position to suit the fitting of the


6. Fit Ridge Cap over the top batten and tile

upstand.

7. Pulling the bottom edge of Ridge Cap


Universal Vent strips into position on each

side of the 'D' Ridge.

8. Install Universal Vent strips continuously

throughout the whole length of the hip on


between each strip.

9. Nail 'D' Ridge Cap and Universal Vents

through the downturn of the cap into the

Ridge upstand and face of the top batten.

Use 4 Decra nails on each side.

10. For ridge end termination use ‘D’ Ridge

End Closure Unit.

NOTE: Where roof pitches exceed 35° it may be necessaryto adjust the return angle of the down turned leg of theD Ridge cap and use an alternative size of ridge fixingbatten.


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Ridges - ventilated – Installation

‘D’ Ridge Vent Filler Applies to: Decra Classic, Parctile (roof

pitches 10° - 35°)


to allow a 5mm continuous air gap on either


2. Fit two battens side by side on both sides

of the ridge using galvanised nails.

3. Lay the ridge course of tiles.

4. Place the Ridge Vent Filler on the top

course of tiles. Position it so that, once

installed, its lower edge will fit tightly against

the downturn of the Ridge Cap.

5. Lay a batten, not exceeding 50 x 25mm,

into the tray of the Ridge Vent Filler and

secure by nailing through the Filler and tile

into the battens on the underside. Use

75mm galvanised nails.

6. Fix ‘D’ Type Ridge Cap over the top

batten by nailing through its downturn into

the face of the batten. Use 4 Decra nails on

each side.



As for Decra Classic BUT

n Half Round Ridge used in lieu of D

Ridge.

Ridge Ventilation using Universal D Ridge/Hip Ventilator

Ridge Ventilation using D Ridge Vent Filler

NOTE: The fixing instructions above are indicative of typical installation procedures, and are provided to illustrate general principles and procedures only. For specificconstructions, always refer to Decra detail drawings and current codes of practice.


'D' Type Ridge Cap (1200mm cover length), folded to shape shown and fixed four times both sides with Decra Nails.

Fascia

Decra Classicturned up 25 to 38mmagainst top batten

Tiling battens

Decra UniversalD Ridge/Hip ventilator

Minimum 5mm clearair gap between tiling, battens and fascia toensure clear ventilation to roofspace

Roofing feltcut back 10mm for ventilation

This detail suitable up to maximum 35˚ only

DECRA PANTILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PANTILE

MONO-RIDGE DETAILS

(D RIDGE WITH UNIVERSAL D RIDGE/HIP VENT)

1:10 5/10/98

DTSE041

Notes:



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX



Plain Tile Ridge/Barge Cap used as aMono-Pitch ridge capping piece, fixed withone Decra nail each side close to the end lap

50 x 25mm batten fixed to top of fascia, and38 x 19mm batten fixed to outer face of fascia

2No Decra Universal ventslaid back to back, tileturned up 25mm againstface of batten

50 x 25mm ridge batten

Dimension variable

Fascia

DECRA PLAIN TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLAIN TILE

VENTILATED MONO-RIDGE DETAIL

1:5/1:10 25/03/04

DPTEV039

fax: (01293) 562709

telephone: (01293) 545058/9




RH10 9PX

West Sussex

Crawley

Faraday Road

Faraday Centre

Unit 3



Decra Universal D Ridge/Hip ventilator

Roofing feltcut back 10mmfor ventilation


Dimension variable

Fascia

Tiling battens

High profile oftile shown dotted

Decra D Ridge sealing strip attached to the underside of 50 x 25mm batten

2 x 25 x 50mmbattens

DECRA PLUS

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLUS

MONO-RIDGE DETAILS

(D RIDGE WITH UNIVERSAL D RIDGE/HIP VENT)

1:10 15/02/01

Notes:

DPSE041



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX


'D' Type Ridge Cap0.43mm Gauge(1200mm cover length),folded to shape shownand fixed four timesboth sides withDecra Plus Nails/Screws

Decra Classic – using D RidgeDTSE041

Decra Oberon – using Ridge/Barge CapDPTE039

Decra Plus Tile – using D RidgeDPSE041

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Monopitch ridges – Design

without ventilation

with ventilation


50

'D' Type Ridge Cap(1200mm cover length), folded to shape shownand fixed four times both sides with Decra Nails.

Fascia

Decra Classic

Tiling battens


Dimension variable

Fascia

DECRA PLAIN TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLAIN TILE

MONO-RIDGE DETAIL

1:5/1:10 5/10/98

DPTE040

Notes:



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX


Oberon Tile Ridge/Barge Capused as a Mono-Pitchridge capping piece. Fixed with one Decra naileach side close to the end lap.


Dimension variable

Fascia

Decra Plus Tiles

Tiling battens


Decra D Ridge sealing stripattached to the undersideof 50 x 25mm batten

2 x 25 x 50mmbattens

50

DECRA PLUS

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLUS

MONO-RIDGE DETAILS

(D TYPE RIDGE)

1:10 15/02/01

Notes:

DPSE040



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX


'D' Type Ridge Cap0.43mm Gauge(1200mm cover length),folded to shape shownand fixed four timesboth sides withDecra Plus Nails/Screws

Decra Classic – using D RidgeDTSE040

Decra Oberon – using Ridge/Barge CapDPTE040

Decra Plus Tile – using D RidgeDPSE040

Applies to Classic – Similar general

principles of construction also apply to:

Decra Stratos and Parctile.

Applies to Classic – Similar general

principles of construction also apply to:

Decra Stratos and Parctile.The drawings above illustrate typical construction details, and are selected from Decra’s extensive library of details showingmany alternative constructions. If the construction you need is not shown here, please see www.decra.co.uk

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‘D’ Type withoutventilationApplies to: Decra Classic and Parctile

1. Turn underlay 25-50mm up face of

ridge/fascia.

2. Fix two tiling battens side by side at top

of monopitch ridge.

3. Fix additional 50 x 25mm monopitch

ridge fixing batten to top tiling batten.

4. Fold Decra ‘D’ type Ridge Cap to form

monopitch ridge profile capping.

5. Secure with four Decra Nails to each side.


NOTE: Where roof pitches exceed 35° it may be necessaryto adjust the return angle of the down turned leg of the DRidge cap and use an alternative size of ridge fixing batten.


As for ‘D’ Type without Ventilation, BUT

n Minimum batten size 50mm x 38mm.


As for ‘D’ Type without Ventilation, BUT


Ridge.

‘D’ Type withoutventilationApplies to: Decra Plus


side at top of ridge, using galvanised nails.


Plus nails driven through the downturned

nose of the top course into the battens.



underside, onto the top course of tiles in a

position to suit the fitting of the Decra

0.43mm ‘D’ Ridge Cap.

4. Fold Ridge Cap to shape and fit over

batten (above) and fascia.

5. Secure Ridge Cap with four Decra

nails/screws both sides.

NOTE: Where roof pitches exceed 35° it may be necessaryto adjust the return angle of the downturned leg of the DRidge cap and use an alternative size of ridge fixing batten.


Ridge/Barge Capwithout ventilationApplies to: Decra Oberon

1. Turn underlay 25-50mm up face of

ridge/fascia.

2. Create fixing position for Ridge/Barge

Cap:

n Fix batten to top of ridge fascia sized to

span from back edge of fascia to top edge

of top tiling batten.

n Fix 50 x 25mm batten to back of batten

above.

n Fold Ridge/Barge Cap to form

monopitch ridge profile capping.

3. Secure with one Decra Nail to each side,

close to the end lap.


NOTE: Where roof pitches exceed 35° it may be necessaryto adjust the return angle of the downturned leg of theRidge/Barge Cap and use an alternative size of ridge fixingbatten.

‘D’ Type withventilationApplies to: Decra Classic, Decra Stratos

and Parctile

As for unventilated mono ridge, BUT

n Cut roofing felt min. 10mm short to allow

clear ventilation through to ridge.

n Allow min. 5mm clear air gap between

tiling, battens and fascia to ensure clear

ventilation to roofspace.

n Install Universal Vent strips behind the

front edge of the Ridge Cap.


NOTE: Where roof pitches exceed 35° it may be necessaryto adjust the return angle of the downturned leg of the DRidge cap and use an alternative size of monopitch ridgefixing batten.

Applies to: Decra Plus Tiles

As for unventilated mono ridge, BUT

n Cut roofing felt min. 5mm short to allow

clear ventilation through to ridge.

n Allow min. 5mm clear air gap between

tiling, battens and fascia to ensure clear

ventilation to roofspace.

n Install Universal Vent strips behind the

front edge of the Ridge Cap.


Monopitch ridges – Installation


50 x 25mm battens fixed to tile battens along length of hip

Roofing Felt

Tile Battens

Rafter

Hip Rafter

40

Decra D type Ridge Cap(1200mm cover length) suitable for roof pitches from10˚ to 35˚. Fixed four timeswith precoated Decra Nails

110 Decra tiles turned up 38mm in front of batten and nailed 4 times each side (using Decra Nails) through the hip capping and into the face of the batten


Decra Classic - Cutaway isometric to Hip DTSE031


Roofing Felt

Tile Battens

Rafter

Hip Rafter

40

Decra D type Ridge Cap(1200mm cover length) suitable for roof pitches from10˚ to 35˚. Fixed four timeswith precoated Decra Nails

110 Decra tiles turned up 38mm in front of batten and nailed 4 times each side (using Decra Nails) through the hip capping and into the face of the batten


Decra Classic – Hip detail using D Ridge DTSE031

Hip Detail Using Decra 'D' RidgeScale 1:10


Roofing Felt

Tile Battens

Decra 'D' Ridge sealing strip attached to underside of 50 x 25mm batten

RafterHip Rafter

Cutaway Isometric to Hip Scale 1:20

40

110

End course cut to appropriate length 5mm short of hip line using special Decra cutting blade

Decra 'D' Ridge Hip End Closure Units are available

DECRA PLUS

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLUS

HIP DETAILS USING D TYPE RIDGE

1:10 15/02/01

Notes:

DPSE031



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX


Decra D type Ridge Cap (1200mm cover length) suitable for roof pitches from 10˚ to 35˚. Fixed four times with Decra Plus Nails/Screws

Decra Plus – Hip detail using D Ridge DPSE031

Hip Detail using Ridge/Barge Cap

Oberon tile turned minimum25mm against 25mm Batten

Hip rafter

Rafter

Decra Oberon Tiles


Roofing Felt

Continuous 50 x 25mmbatten fixed to Tiling battens


DECRA PLAIN TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLAIN TILE

HIP DETAIL USING RIDGE/BARGE CAP

1:10/1:20 5/10/98

DPTE032

Notes:



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX


Oberon Tile Ridge/Barge Cap 370mm cover suitable for roof pitches from 15˚ to 45˚. Fixed with one Decra Nail each side of the barge cap near the end lap


Decra Oberon – Hip detail using Ridge/Barge Cap DPTE032

Scale 1:10


Roofing Felt

Tile Battens

Rafter

Hip Rafter

Decra tiles turned up 25mm in front of batten and nailed 4 times each side (using Decra Nails) through the hip capping and into the face of the batten



Decra Elegance – Hip detail using Half Round Ridge DESE033

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Hips - unventilated – Design


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Hips - unventilated – Installation

‘D’ TypeunventilatedApplies to: Decra Classic, Stratos and

Parctile

1. Fit 50 x 25mm hip battens (50 x 38mm

for Decra Stratos), fixed to tile battens along

length of hip to suit D type Ridge Cap.

2. Cut tiles to a raking angle and turn Decra

tiles up 38mm in front of batten and fit D

type Ridge Cap over upstand.

3. Secure tiles and ridge cap using 4-no.

pre-coated Decra nails each side, driven

through the hip capping and tile upstand,

into the face of the batten.

4. For hip end termination use ‘D’ Ridge Hip

End Closure Unit.

NOTE: Decra D Ridge Caps are tapered to allow for laps.Overall length of ridge cap 1280mm, lap each ridge cap80mm to provide 1200mm overall length of cover.”


As for ‘D’ Type Unventilated, BUT

n Half Round Ridge used in lieu of

D Ridge.

‘D’ TypeunventilatedApplies to: Decra Plus Tile

1. Cut tiles to raking angle (using Decra

special cutting blade) 5mm short of hip line.




hip in a position to suit the fitting of the


3. Make an incision in the hip sealing strip at

each intersection of the sealing strip with the

nose of the tile to allow the sealing strip to

dress neatly into step between each course

of the tiles.

4. Position ‘D’ Ridge Cap over the top

batten and upstand edge of tile.

5. Fix four times both sides with Decra

nails/screws.


End Closure Unit.


Ridge/Barge CapunventilatedApplies to: Decra Oberon

1. Fit 50 x 25mm batten, fixed to tile

battens, along length of hip.

2. Cut tiles to a raking angle and turn Decra

Oberon tiles up 25mm against batten.

3. Fit Ridge/Barge Cap over upstand and

nail with one Decra fixing nail on each side

of the Ridge Cap near the end lap.



40


Roofing Felt

Tile Battens

Rafter

Hip Rafter

Decra D type Ridge Cap (1200mmcover length) suitable for roofpitches from 12˚ to 35˚. Fixedfour times with Decra Nails.

Universal Decra Ridge and Hip Vent

110Decra tiles turned up 38mm in front of batten and nailed 4 times each side (using Decra Nails) through the hip capping and into the face of the batten


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Hips - ventilated – Design


Hip Detail using 'D' Type Ridge Scale 1:10

Stratos tile turned minimum38mm against 38mm batten

Hip rafter

Rafter

Decra Stratos Tiles

Tiling battens, minimumthickness 38mm, sizedetermined by rafter spacing

Roofing Felt


Decra Universal Ridge and Hip Vent

Roofing felt cut short to leave 10mm minimum ventilation gap.

Continuous 50 x 38mm battenfixed to Tiling battens


DECRA STRATOS TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA STRATOS TILE

HIP DETAIL USING D RIDGE CAP

VENTILATED

1:10/20 5/10/98

DSTE031

Notes:



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX


Stratos D type Ridge Cap (1200mm cover length) suitable for roof pitches from 12˚ to 35˚. Fixed four times with Decra Nails.


Decra Stratos – Ventilated Hip using D Ridge DSTE031


Tile Battens

Rafter

Hip Rafter

Decra Ridge and Hip Vent

Decra Underlay/Decra Breather Membrane as appropriate

DECRA ELEGANCE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA ELEGANCE

HIP DETAILS USING HALF ROUND RIDGE

VENTILATED

1:10/20 5/10/98

DESE034

fax: (01293) 562709

telephone: (01293) 545058/9




RH10 9PX

West Sussex

Crawley

Faraday Road

Faraday Centre

Unit 3




Decra tiles turned up 25mm in front of batten and nailed times each side (using Decra 4 Nails) through the hip capping and into the face of the batten

Decra Elegance – Ventilated Hip using Half round Ridge DESE034

Scale 1:10



DECRA PLUS

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLUS

HIP DETAILS USING D TYPE RIDGE

VENTILATED

1:10/20 15/02/01

Notes:

DPSE032



Roofing Felt

Tile Battens

Decra 'D' Ridge sealing strip attached to underside of 50 x 25mm batten

Rafter

Hip Rafter

40

110

End course cut to appropriate length 5mm short of hip line using special Decra cutting blade

Felt cut short togive clear ventilation



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX


Decra D type Ridge Cap (1200mmcover length) suitable for roof pitches

Decra Plus Tile – Ventilated Hip using D Ridge DPSE032

Hip Detail using Ridge/Barge Cap Scale 1:10

Oberon tile turned minimum 25mm against 25mm Batten

Hip rafter

Rafter

Decra Oberon Tiles


Roofing Felt

Continuous 50 x 25mm battenfixed to Tiling battens


Felt cut short minimum10mm to allow clearventilation to roof space

Decra UniversalHip Ridge Ventilator

DECRA PLAIN TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLAIN TILE

HIP DETAIL USING RIDGE/BARGE CAP

VENTILATED USING UNVERSAL HIP/RIDGE VENTILATOR

1:10/1:20 5/10/98

DPTE033

Notes:



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX


Oberon Tile Ridge/Barge Cap 370mm cover suitable for roof pitches from 15˚ to 45˚. Fixed with one Decra Naileach side of the barge cap near the end lap


Decra Oberon – Ventilated Hip using Ridge/Barge Cap DPTE033

40


Roofing Felt

Tile Battens

Rafter

Hip Rafter

Decra D type Ridge Cap (1200mmcover length) suitable for roofpitches from 12˚ to 35˚. Fixedfour times with Decra Nails.


110Decra tiles turned up 38mm in front of batten and nailed 4 times each side (using Decra Nails) through the hip capping and into the face of the batten


Decra Classic – Ventilated Hip using D Ridge DTSE032

Decra Classic - Cutaway isometric to Hip DTSE032

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Hips – ventilated – Installation(Universal D Ridge/Hip ventilator)

‘D’ Type with Decra Universal

Ridge/Hip Vent

Applies to: Decra Classic, Parctile,

Decra Stratos

1. Cut the roofing felt back to allow a 5mm

continuous air gap on either side of the hip

tree.

2. Nail 50 x 25mm batten to the tiling

battens on each side of the hip using

galvanised nails.

3. Cut tiles to raking angle to suit. Turn edge

of tiles up to form a 38mm upstand against

the batten.

4. Position 'D' Ridge Cap over the top




Universal Ridge/Hip strips into position on

each side of the 'D' ridge.




between each strip.


through the downturn of the cap into the tile

upstand and face of the top batten. Use 4

Decra nails on each side.


End Closure Unit.



As for Decra Classic, BUT


Ridge.

‘D’ Type with Decra Universal Ridge/Hip

Vent

Applies to: Decra Plus Tile,



tree.

2. Cut tiles to raking angle (using Decra

special cutting blade) to form a mitred joint

with a 10mm air gap between the cut edges

of the tile on both sides of the hip.




hip in a position to suit the fitting of the


4. Make an incision in the hip Sealing Strip

at each intersection of the Sealing Strip with

the nose of the tile to allow the Sealing Strip

to dress neatly into step between each

course of the tiles.

5. Position ‘D’ Ridge Cap over the top




Universal Vent strips into position on each

side of the 'D' Ridge Cap.




between each strip.




Decra nails on each side.


End Closure Unit.


Ridge/Barge Cap with Decra Universal

Ridge/Hip Vent

Applies to: Decra Oberon



tree.

2. Nail 50 x 25mm batten to the tiling

battens on each side of the hip using

galvanised nails.

3. Cut tiles to raking angle to suit. Turn edge

of tiles up to form a 25mm upstand against

the batten.

4. Position Ridge/Barge Cap over the top


5. Pulling the bottom edge of Ridge/Barge

Cap away from the upstand edge of the

tiles, slip Universal Vent strips into position

on each side of the Ridge/Barge Cap (See

illustration).




between each strip.

7. Nail Ridge/Barge Cap and Universal Vents



Decra nail each side of the Ridge/Barge Cap

near the end lap.



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Valleys – Design


Lead Valley Detail Using Layboards

GRP Valley Detail

Decra Classic tiles cut to rake and bent down at valleyLead valley tray (by others)

taken over batten and welted as shown

Timber packing pieces, thickness to suit.

Tile batten

Roofing felt

Continuous batten to each side of valley gutter

125 approx

Rafter

Valley rafter

Decra Classic tiles cut to rake and bent down at valley Preformed GRP Valley tray,

thickness of counter battens to suit. Tile batten

Roofing felt


125 approx

Rafter

Valley rafter

200

250

250x25mm layboard flush with top surface of rafter. Note: Prefabricated Roof Trusses must not be notched.

Lead Valley Detail Using Layboards Over Rafters Decra Classic tiles cut to rake and bent down at valley Lead valley tray (by others)

taken over batten and welted as shown


Tile batten

Roofing felt


125 approx

Rafter

Valley rafter

275

6mm exterior grade ply layboards to valley

Noggins cut between rafters to support ply layboards


Noggins cut between rafters to support valley tray

50

50

Decra Classic – Valley Gutter Details DTSE055



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Valleys – Installation

Lead ValleyAll Decra Tile systems:


valley boards.

2. Lay 250mm girth valley boards flush with

top surface of rafter or 6mm exterior grade

plywood valley boards on top of rafters.

3. Ensure that valley boards provide

continuous support for lead valley.

4. Install continuous valley batten to each

side of valley gutter, approx 200mm from

centre line of valley, to support tiling battens.

5. Dress lead over layboards and valley

battens and provide welted end, min.

275mm from centre line of valley

6. If required install timber packing pieces to

suit to support underlay and tile battens at

intermediate position*.

7. Cut underlay/breather membrane to rake

and dress over valley to lap onto lead valley.

Ensure that underlay is not laid under lead.

8. Cut tile battens to rake, projecting over

valley typically 65mm short of centre line

(also allowing sufficient downturn of tile edge

into valley).

9. Cut tiles neatly, fold down to cover

batten, and fix to provide a gap typically

125mm wide centred on valley

GRP ValleyAll Decra Tile systems:


the valley boards & GRP valley tray.

2. Lay valley boards flush with top surface of

rafters or 6mm exterior grade plywood

valley boards on top of rafters.

3. Ensure that valley boards provide

continuous support for GRP valley tray.

4. Install continuous valley batten to each

side of valley gutter, approx 200mm from

centre line of valley, to support tiling battens.

5. Install GRP valley in accordance with

manufacturer’s instructions.

6. If required install timber packing pieces to

suit to support underlay and tile battens at

intermediate position*.

7. Cut underlay/breather membrane to rake

and dress over valley to lap onto lead valley.

Ensure that underlay is not laid under lead.

8. Cut tile battens to rake, projecting over

valley typically 65mm short of centre line

(also allowing sufficient downturn of tile edge

into valley).

9. Cut tiles neatly, fold down to cover

batten, and fix to provide a gap typically

125mm wide centred on valley.

*Timber packing pieces: These are used to

raise the tiling battens above the level of the

rafters to create an upstand for the valley

tray, and should be reduced from min.

19mm thickness across three or more

rafters to avoid a visible rise in the tiling.


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Velux window – Design

EDW Top Gutter Flashing

Velux Rooflight

Roofing Felt

Decra Classic tiles

Typical Section

Typical Cross-Sections

Roofing Felt

Velux Rooflight

125

60 -

150

Velux EDW Bottom Apron Flashing

20

Detail using 50 x 25mm Battens

125

Velux EDW Side Flashing

250

30 - 45mm

50 -

150m

m

50 x 25mm battens:220 x 6mm thick exterior grade ply layboard over rafter bridling, fitted with 20mm gap between ply and top edge of velux rooflight50 x 38mm battens:Ply thickness increases to 18mm,50 x 50mm battens:Ply thickness increases to 30mm - or use rows of 30mm thick battens for support beneath top edge gutter.

Battens fixed through to rafterswith galvanised wire nails,length and gauge is determinedby size of tile battens and rafterspacings (see table in technicalbrochure).

Decra Classic tiles fixed with precoated twist shank galvanised nails, vertically fixed nail heads to becovered with a finishing kit(supplied by Decra).

100mm x 6mm thick exterior gradeply layboard with 20mm clear to each side of rooflight to secure fixing brackets 20mm below top surface of tiling battens.

50x25mm batten end supported onfull rafter or supporting batten belowroofing felt.

Fixing bracket20mm below top surface of tiling batten

Fixing bracket20mm below topsurface of tiling batten

Detail using 50 x 50mm BattensThis detail same for 50 x 38mm battens,battens notched 20mm to secure fixingbrackets 20mm below line of tiling battens

Decra Classic tiles turndown 20mm at edge

Sealing Strip suppliedas part of EDW flashing

Notched tiling battenfully supported ondouble rafters

Tiling Battens, minimum thickness 25mm, size determined by rafter spacing, refer to technical information brochure.

Minimum and maximum dimensions from front face of velux rooflight and bottom face of tiling batten. Where dimensions exceeds 50mm, ply layboards or battens must be used below the bottom apron flashing for support.

VELUX - EDW FLASHING

Note:50x25mm battens:6mm ply layboards to be fitted to top edgeand sides to secure Velux brackets at 20mmbelow top surface of tiling battens.50x50 and 50x38mm Battens:Tiling battens to be notched 20mm to secureVelux fixing brackets 20mm below top surfaceof tiling battens.

Tiling batten against topedge of EDW flashing

Sealing Strip supplied aspart of EDW flashing

Decra Classic DTSE080


Decra Oberon, Plus Tile, Elegance and Parctile.


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Velux window – Design

Velux Rooflight profiles and details courtesy of, and copyright to, Velux.

This detail is to be read in conjunction with Velux installation and design instructions.Design and installation must ensure that ventilation of roofspace requirements are adhered to. Detail shown may not suit all types of roof construction where ventilation is concerned .

15 minimum roof pitch for Velux GGL Rooflights.Velux Type EDW flashings must be usedThe use of the following rooflights are to be strongly recommended for improved fitting in conjunctionwith Decra Stratos Tiles GGL102, GGL104, GGL304, GGL308, GGL608, GGL804, GGL808, Specialsizes complying with overall external frame heights of 780mm, 980mm, 1400mm.

Decra Stratos Tiles turndown 20mm at edge

EDW Top Gutter Flashing

Velux Rooflight

Roofing Felt

Decra Stratos Tiles

Typical Section

Typical Cross-Sections

Scale 1:10

Roofing Felt

Notched tiling batten fullysupported on double rafters

Velux Rooflight

125

60 -

150

Sealing Strip supplied aspart of EDW flashing

Velux EDW Bottom Apron Flashing

Tiling batten against topedge of EDW flashing

Sealing Strip suppliedas part of EDW flashing

20

Detail using 50 x 50mm BattensDetail using 50 x 38mm Battens

125

Fixing bracket20mm below topsurface of tilingbatten

Velux EDW Side Flashing

250

Fixing bracket20mm below topsurface of tilingbatten

30 - 45mm

This detail to be read in conjunction withAcrobat files for velux installation instructions

in the information section on the DecraTechnical Services CD

50 -

150m

m

DECRA STRATOS TILE

VELUX ROOFLIGHT EDH FLASHING

1:10 07/09/98

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISIONDSTE080

Notes:



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX

DECRA STRATOS TILE

50 x 38mm battens:220 x 19mm thick exterior grade ply layboard over rafter bridling, fitted with 20mm gap between ply and top edge of velux rooflight50 x 50mm battens:Ply thickness increases to 30mm- or use rows of 30mm thick battens for support beneath

Battens fixed through to rafters with galvanised wire nails, length and gauge is determined by sizeof tile battens and rafter spacings (see table in technical brochure).

Stratos Tiles fixed with precoated twist shank galvanised nails ,vertically fixed nail heads to becovered with a finishing kit (supplied by Decra).

Minimum and maximum dimensions from front face of velux rooflight and bottom face of tiling batten. Where dimensions exceeds 50mm, ply layboards or battens must be used below the bottom apron flashing for support.

Tiling Battens, minimum thickness38mm, size determined by rafterspacing, refer to technicalinformation brochure.

38mm tiling batten notched 20mm, or19mm ply layboard to secure fixing bracket 20mm below top surface of tiling batten

50x38mm batten end supported on full rafter or supporting batten below roofing felt.

VELUX - EDW FLASHINGNote:50 x 50 and 50 x 38mm Battens:Tiling battens to be notched 20mm to secure Velux fixing brackets 20mm below top surface of tiling battens.


Decra Stratos DSTE080


Applies to: All Decra Tiles

The following details should be read in

conjunction with Velux design and

installation instructions. Decra Classic tiles

are illustrated, but the same principles apply

for other Decra tile systems.

1. Prepare roof structure for installation of

roof light. Where necessary, add timber

noggins of suitable section (See figure A).

2. Applies where the tile batten size is 50 x

25mm:

i) Install 6mm exterior quality plywood

layboards (see figure B)

n layboard 1 (100mm width).

n layboard 2 (220mm depth).

Secure layboards to underlying

rafters/noggins , leaving a 20mm gap

between edge of layboards and roof light.

ii) Install roof tile underlay and 50 x 25mm

tile battens (see figures C and D).

iii) Ensure end of tile battens butt against

plywood layboards. Do NOT install tile

battens on top of plywood (See figure E).

iv) Secure tile battens to rafters and noggins

with appropriate fasteners.

v) If tile batten at base of rooflight fouls

plywood layboard, notch tile batten to suit

(see blue line, figure F).

3. Applies where the tile batten size exceeds

50 x 25mm:

i) Install roof tile underlay, tile battens and

timber bearer batten support for Velux

rooflight (See figure G). Make correct choice

of batten size from Table below.

ii) If the position of the bearer batten support

for Velux rooflight obstructs the tile batten,

use tile batten as a rooflight bearer batten.

Recess Velux rooflight fixing bracket into tile

batten by cutting a 20mm deep notch into

tile batten where rooflight fixing bracket

intersects tile batten.

iii) At sides of rooflight cut tile battens leaving

a 20mm gap between edge of tile batten

and rooflight. Cut notch in tile battens

100mm wide x 20mm deep.

4. To improve weathertightness of rooflight

an optional Velux BFX collar, as

recommended by Velux, can be installed

over the tile battens as per Velux instructions

(BFX collar omitted from illustrations for

reasons of clarity)

5. Install Velux EDW front apron flashing as

per Velux installation manual (See figure H),

taking care to dress malleable flashing neatly

into profile of Decra Tile (See figure L). To

improve fit of front apron flashing, flatten

raised crowns of tile profile where the raised

crowns overlap tile batten prior to installing

front apron.

6. If the position of the Velux rooflight

necessitates the use of a short course of

tiles under the Velux front apron, cut Decra

tiles around front edge of rooflight to

appropriate length using tin snips. Prior to

installation of cut tile, install suitable size

timber packing piece to act as a support to

head of cut tile. This packing piece should

be of a depth sufficient to ensure line of tile

does not stand proud of or dip below

existing sight line of adjoining Decra tiles.

7. Install Velux EDW side and back gutter

flashing as per Velux installation manual

(See figures J & K).

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Velux window – Installation

Recommended Batten Sizes (if greater than 50 x 25mm is required)

Rafter or Tile Profile Tile Batten Rooflight Bearer

Truss Spacing Size Batten Size

Up to 600mm

centres Decra Stratos 50mm x 38mm 50mm x 18mm

Greater than 600mm Decra Classic 50mm x 50mm 50mm x 30mm

but not exceeding Decra Oberon 50mm x 50mm 50mm x 30mm

1200mm centres Decra Plus 50mm x 50mm 50mm x 30mm

Decra Stratos 50mm x 50mm 50mm x 30mm

Parctile 50mm x 50mm 50mm x 30mm

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Velux window – Installation

8. Cut and bend tiles adjacent

Velux side flashing to form a

20mm downturn, using a Decra

guillotine and bender. Tiles

adjacent to Velux side flashings

should oversail tile battens. Gap

between the edge of the tile and

the roof light should not be less

than 30mm (See figures H, I &

L).

9. Flare edge of nose of Decra

tile outwards to form neat outlet

to Velux side flashing gutter

(See figure L).

10. Install eaves batten directly

behind Velux EDW back gutter

flashing. Secure bottom course

of Decra tiles with four Decra

fixing nails driven vertically, close

to the high point of the tile

profile, into the eaves batten.

Seal these nail heads using

Decra Finishing Kit.

11. Tiles adjacent to Velux back

gutter flashing should oversail

eaves battens. Gap between

the edge of the tile and the roof

light should be minimum 60mm

and maximum 150mm (See

figure H & N).

12. If the position of the rooflight

dictates a short course of tiles,

cut tiles adjacent Velux back

gutter flashing and bend to form

a 25mm downturn, using Decra

guillotine and bender.

NOTE: The fixing instructions above areindicative of typical installation procedures,and are provided to illustrate generalprinciples and procedures only. For specificconstructions, always refer to Decra detaildrawings and current codes of practice.

a f

b g

c h

d i

e j

k

l

m

n

2

1

A completedVelux windowinstalled

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Vertical tiling – Design

All Decra tile profiles can be hung vertically. However, the Decra Oberon Tile is the natural choice for vertical hanging because it provides a

finished appearance which closely resembles that of traditional vertically hung tiles.

Decra Oberon Tiles

Tile Battens

Felt Underlay/Breather Paper

Framing

50 x 38mmvertical batten at corner fixed totile battens

50 x 38mm vertical batten at corner fixed to tile battens

Oberon Tile Ridge/BargeCap 370mm cover,fixed with one Decra Naileach side of the bargecap near the end lap

Oberon Tiles

Tile Battens


Framing

225

225

Vertical lead gutterto corner, dressed over battens andwelted as shown

Tiles cut and bentto within 5mm of gutter

DECRA PLAIN TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLAIN TILE

VERTICAL TILING DETAILS

INTERNAL AND EXTERNAL CORNERS

1:10 5/10/98

DPTE064

Timber packing pieces,thickness to suit.

The timber packing pieces are used to raise the tiling battens above the level of the rafters to create

an upstand for the vertical valley tray, and should be reduced from minimum 19mm thick across three

or more rafters to avoid a visible rise in the tiling.

Notes:



Telephone:

(01293) 545058/9Fax:

(01293) 562709email:

[email protected]:


Unit 3

Faraday Centre

Faraday RoadCrawley

West Sussex

RH10 9PX



Decra Oberon – Internal Corner DPTE064

Decra Oberon Tiles

Tile Battens


Framing

50 x 38mmvertical batten at corner fixed totile battens

50 x 38mm vertical batten at corner fixed to tile battens

Oberon Tile Ridge/BargeCap 370mm cover,fixed with one Decra Naileach side of the bargecap near the end lap

Oberon Tiles

Tile Battens


Framing

225

225

Vertical lead gutterto corner, dressed over battens andwelted as shown

Tiles cut and bentto within 5mm of gutter

DECRA PLAIN TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLAIN TILE

VERTICAL TILING DETAILS

INTERNAL AND EXTERNAL CORNERS

1:10 5/10/98

DPTE064

Timber packing pieces,thickness to suit.

The timber packing pieces are used to raise the tiling battens above the level of the rafters to create

an upstand for the vertical valley tray, and should be reduced from minimum 19mm thick across three

or more rafters to avoid a visible rise in the tiling.

Notes:



Telephone:

(01293) 545058/9Fax:

(01293) 562709email:

[email protected]:


Unit 3

Faraday Centre

Faraday RoadCrawley

West Sussex

RH10 9PX



Decra Oberon – External Corner DPTE064

Typical Timber window section. No specific manufacturer type

Scale 1:5

600x900mm window elevation

Scale 1:50

Cross-Section

Scale 1:10

Part Elevation

Scale 1:10

Arrange tiling courses or windows so that the window head occurs at a joint in the tiles

25

Breather Membrane

Tiling Battens

Decra Oberon Tiles

Ex 50 x 75mm Arris rail with breather membrane dressed over

Edge bead shaped at top to fit beneath tile downstand

Mastic pointing

Breather Membrane

Tiling Battens

Decra Plain Tiles

Ex 50 x 75mm rail, size determined by next step in tile, shaped to dress lead flashing down over tile upstand

Lead flashing (by others) dressed down over step in tile and below window into weather check.

This detail requires the use of a cill extension piece, otherwise a timber sub-cill should be used

Planted timber bead, size dependant on batten sizes (12x40mm shown). Fixed in position after tiles fitted through to vertical edge batten

Vertical edge batten toside of window, size dependant on battensizes, min 32mm thick

Oberon Tiles cut andbent in to within 5mmof window jamb

Breather paper extended to edge of planted timber bead

Mastic Pointing

DECRA PLAIN TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLAIN TILE

VERTICAL TILING DETAIL

WINDOW ABUTMENT

1:5/10 5/10/98

DPTE075

Notes:



Telephone:

(01293) 545058/9

Fax:

(01293) 562709email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX



Decra Oberon – Window Head Detail DPTE075

Oberon Tile cut to rakeabove line of soffit board

Soffit fixed tounderside of batten

Batten fixed through cut tiles intodouble batten and counterbattenprior to fixing of soffit and fascia

Barge Board Soffit

Barge Board

Ridge/Barge

Component Isometric

Scale 1:20

Vertical Tiles Isometric Detail

Scale 1:10

Roofing Felt/Breather Paper

Tile Batten

Counter Battens

DECRA PLAIN TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLAIN TILE

VERTICAL TILING SOFFIT ABUTMENT

1:10/20 5/10/98

DPTE076

Notes:



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX


L Shaped cap formed on-site from Oberon top course

This alternative detail can be used where it is not possible to remove the soffit or replace the fascia board.


Gable Ladder

50 x 25mmedge batten

50 x 19mmbatten

Decra Plain Tile Ridge/Barge cap with one Decra Nail on each side of the ridge cap near the end lap. Cap dressed


Decra Oberon – Barge Detail DPTE076

Oberon Tile cut to rakeabove line of soffit board

Soffit fixed tounderside of batten

Batten fixed through cut tiles intodouble batten and counterbattenprior to fixing of soffit and fascia

Barge Board Soffit

Barge Board

Ridge/Barge

Component Isometric

Scale 1:20

Vertical Tiles Isometric Detail

Scale 1:10

Roofing Felt/Breather Paper

Tile Batten

Counter Battens

DECRA PLAIN TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLAIN TILE

VERTICAL TILING SOFFIT ABUTMENT

1:10/20 5/10/98

DPTE076

Notes:



Telephone:

(01293) 545058/9

Fax:

(01293) 562709

email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX


L Shaped cap formed on-site from Oberon top course

This alternative detail can be used where it is not possible to remove the soffit or replace the fascia board.


Gable Ladder

50 x 25mmedge batten

50 x 19mmbatten

Decra Plain Tile Ridge/Barge cap with one Decra Nail on each side of the ridge cap near the end lap. Cap dressed


Decra Oberon – Soffit Detail DPTE076


Scale 1:5


Scale 1:50

Cross-Section

Scale 1:10

Part Elevation

Scale 1:10


25

Breather Membrane

Tiling Battens

Decra Oberon Tiles



Mastic pointing

Breather Membrane

Tiling Battens

Decra Plain Tiles








Mastic Pointing

DECRA PLAIN TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLAIN TILE


WINDOW ABUTMENT

1:5/10 5/10/98

DPTE075

Notes:



Telephone:

(01293) 545058/9

Fax:

(01293) 562709email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX



Decra Oberon – Window Cill Detail DPTE075


Scale 1:5


Scale 1:50

Cross-Section

Scale 1:10

Part Elevation

Scale 1:10


25

Breather Membrane

Tiling Battens

Decra Oberon Tiles



Mastic pointing

Breather Membrane

Tiling Battens

Decra Plain Tiles








Mastic Pointing

DECRA PLAIN TILE

CONTENT

DRAWING SCALE

DRAWING NO

DATE

REVISION

DECRA PLAIN TILE


WINDOW ABUTMENT

1:5/10 5/10/98

DPTE075

Notes:



Telephone:

(01293) 545058/9

Fax:

(01293) 562709email:

[email protected]

Web-Site:


Unit 3

Faraday Centre

Faraday Road

Crawley

West Sussex

RH10 9PX



Decra Oberon – Window Jamb Detail DPTE075


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Vertical tiling – Installation

Installation guidance refers to Decra

Oberon Tiles

Fix tiles to battens in standard manner as

per roofing:

n Always install Decra Underlay or Breather

Membrane on exterior face of structure.

n When installing the tiles ensure that they

are laid in a random/broken bond pattern.

This can be achieved by cutting the first tiles

at verges and external/internal angles to

random lengths ensuring that the pattern of

the profile of the tile does not appear

repeatedly in the same vertical position up

the elevation to be tiled.

n Fix each tile in lowest course and first

course above doors/windows using four

nails/screws driven horizontally close to the

high point of the tile profile.

n Fix tiles in each subsequent courses

using four nails/screws driven through

downturned nose into face of battens and

one Decra fixing nail/screw driven through

the intermediate step of the down turned

nose of the tile into the face of the batten.

At internal corners:

n Install vertical lead gutter to corner,

extending min. 225mm from corner on both

sides, dressed over battens and welted.

n Install tiling battens leaving gap of

approx. 80mm to corner on both sides.

n Cut and bend tiles back to within 5mm of

lead gutter.

At external corners:

n Install 50 x 38mm vertical battens, fixed

to tile battens at both faces of the corner.

n Bend tiles to form 25–38mm upstand

against vertical battens.

n Position Ridge/Barge Cap over vertical

battens and tile upstand.

n Fix with one Decra nail each side of the

Ridge/Barge Cap near the end lap.

At soffits

Where soffit and fascia board can be

removed or are to be replaced:

n Remove soffit (and fascia).

n Install 50 x 25mm timber batten to face

of structure, positioned so that bottom of

batten aligns with bottom of soffit.

n Nail head of top course of tiles to batten

(above).

n Fix 50 x 25mm batten to bottom of gable

ladder, abutting Decra Tile, ready to take

soffit.

Retaining existing soffit and fascia in

position:

n Fix 50 x 25mm batten to structure,

abutting soffit.

n Nail head of top course of tiles to batten

(above).

n Install 50 x 25mm batten to soffit,

abutting tile.

n Provide L shaped cap to this batten, cut

on site from Decra Oberon Tile Top Course

flashing.

At window reveals:

n Bend tiles to form a return into recess of

window reveal, leaving a 5mm gap between

returned edge of tile and window jamb.

n Trim out window reveal with timber/upvc

facing pieces.


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Mansard and changes in roof pitch – Design

MansardApplies to: All Decra Tiles

Roofing Felt

Decra Tiles

370mm

370mm

370mm

370mm

370

150

Roofing Felt

Decra Tiles

Lead Flashing (by others)

Decra Continuous Rafter Roll - over insulation ventilator

Decra Top Course bent to suit spacing of tile batten at change of pitch

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If this dimension is over 150mm Decra tiles to be used.

Nosing of main roof tile to sit close to top course.

Decra nails fixed vertically through high point of tile to have finishing kit applied to head.

Tiling Battens, size determined by rafter spacing, refer to technical brochure.


Decra Classic – Using Lead Flashing DTSE060

as per tile gauge

as per tile gaugeas

per tile

gauge


Decra Classic – Detail at Change in pitch DTSE065

Roofing Felt

Decra Tiles

370mm

370mm

370mm

370mm

370

150

Roofing Felt

Decra Tiles

Lead Flashing (by others)

Decra Continuous Rafter Roll - over insulation ventilator

Decra Top Course bent to suit spacing of tile batten at change of pitch

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If this dimension is over 150mm Decra tiles to be used.

Nosing of main roof tile to sit close to top course.

Decra nails fixed vertically through high point of tile to have finishing kit applied to head.

Tiling Battens, size determined by rafter spacing, refer to technical brochure.


Decra Classic – Using Top Course DTSE060

Changes in roof pitchApplies to: All Decra Tiles


apply to: Decra Stratos and Parctile.


apply to: Decra Stratos and Parctile.


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Mansard and changes in roof pitch – Installation

Mansard roofs Using lead flashing

Applies to: All Decra Tiles

1. Batten out steep pitch roof slope.

2. Batten out shallow pitch roof slope,

ensuring an eaves batten is positioned at the

bottom edge of the slope (i.e at the point

where the change in pitch occurs).

3. Fix top course of tiles to steep pitch roof

slope, cut and bent to suit spacing of tile

batten at change in pitch. Nail head of tile to

eave batten at the change in pitch on

shallow pitch roof slope.

4. Install lead flashing, securing top edge of

lead flashing to eave batten and dressed

down over tile below.

5. Install bottom tile course to shallow pitch

roof slope over the lead flashing and nail

through to batten.

6. Seal nail heads using Decra finishing kit.

Using top course

Applies to: All Decra tiles

1. Batten out steep pitch roof slope.

2. Install top batten to steep pitch roof slope

at no more than 150mm away from the

point where change in pitch occurs.

3. Batten out shallow pitch roof slope,

ensuring an eaves batten is positioned at the

bottom edge of this slope (i.e at the point

where the change in pitch occurs).

4. Fix penultimate course of tiles to steep

pitch roof slope, nailing the head of the tiles

to the top batten above.

5. Fix Decra Top Course to top batten on

steep pitch roof slope, bent to suit spacing

of eave batten on the shallow pitch roof

slope. Nail head of top course flashing to

eave batten at the change in pitch on

shallow pitch roof slope.

6. Position bottom course of tiles to shallow

pitch roof slope so that the nosing of the tile

sits close to the face of the Decra top

course flashing of steep pitch roof slope.

7. Fix bottom course of tiles to shallow pitch

roof slope by nailing through high point of

tile.

8. Seal nail heads using Decra finishing kit.

Changes in roofpitchApplies to: All Decra tiles

1. Set out battens at appropriate gauge up

to point where change in roof pitch occurs.

2. Set out battens at pitch change using

front top edge of battens as the datum point

rather than the underlying rafter.

3. Install next tile batten at appropriate

standard gauge for tile from the datum point

at the front top edge of batten of the lower

batten to front top edge of battens of the

next batten (see diagram below).

4. Tile in standard manner.

Not from here to here

Batten gauge should be measureddiagonally from here to here


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Gas flue ridge

Applies to: All Decra Tile systems

except Decra Oberon and Elegance

The Decravent Gas Glue Ridge Terminal is

produced to BS 5440 and complies with all

Building Regulations and Standards for gas

burning appliances with input up to 60kW.

British Gas approved and compatible with

Decra ‘D’ Ridge.

Flue Component Isometric

50 x 25mm batten, Classic tiles turned up 25mm to 38mm against face of Batten

Decra Classic tile

Tiling battens, size determined by rafter spacing

370mm

Dimension Variable

40

D type Ridge Cap with Gas Flue Ridge Terminal.

R Type Ridge Terminal adapter supplied by others.

Battens to be cut back to leave minimum 25mm clearance between timber and R Type Flue adapter

Decra Underlay or Decra Breather Membrane as appropriate

400mm

Universal D Ridge/Hip ventilator blanking pieces 1200mm long each side in length along ridge, centred on flue tile centre, to each side of gas flue terminal tile. Ventilation blanking pieces only used if rest of ridge is being ventilated with universal ridge ventilator.

If in-situ rafters with a ridge are used, a 400mm wide section of ridge has to be removed. Where it proves necessary to cut rafters a timber noggin must be secured to rafters each side of the ridge.

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Decra Classic DTSE027


(Hr) 3.84m

(Br) 5.0m(Lr) 9.0m

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DesignconsiderationsRoof drainage design

To check that the Icopal Rainwater System

has sufficient capacity to drain the roof area

and to assess the number and position of

downpipes required, it is necessary to

calculate the roof flow load.

Three key factors must be taken into

account:

i. Area to be drained (the effective roof area).

ii. Intensity of rainfall.

iii The number and positioning of downpipes.

EFFECTIVE ROOF AREA

Calculate Effective Roof Area (ERA) in

accordance with:

n BS EN 12056-3: 2000 Gravity drainage

inside buildings.

n The Building Regulations 2002, Approved

Document H, Part H3.

Using the formula in BS EN 12056-3:

2000:

ERA (m2) = Lr x (Br + Hr/2)

Br = the plan width of the roof from gutter

eave to roof apex.

Hr = the height of the roof from gutter eave

to roof apex in metres.

Lr = the length of the roof to be drained in

metres (i.e. gutter length).

Example: using the formula in BS EN

12056-3: 2000:

A roof with a plan width from gutter eave to

apex of 5m x a height from gutter eave to

roof apex of 3.84m x a length of roof 9m

long. Roof pitch 37.5°.

ERA (m2) = Lr x (Br + Hr/2)

ERA (m2) = 9 x (5 + 3.84/2)

ERA (m2) = 62.28m2

Alternatively using the same roof dimensions

but using a multiplication method similar to

that shown in H3 of the Building

Regulations (see table opposite)

Roof pitch Multiplication factor

10° 1.088

12.5° 1.111

15° 1.134

17.5° 1.158

20° 1.182

22.5° 1.207

25° 1.233

27.5° 1.260

30° 1.289

32.5° 1.319

35° 1.350

37.5° 1.384

40° 1.420

42.5° 1.458

45° 1.500

47.5° 1.546

50° 1.596

52.5° 1.525

55° 1.714

57.5° 1.785

60° 1.866

62.5° 1.960

65 2.072

67.5 2.207

70°+ use formula ERA (m2)= Lr x (Br + Hr/2) as shown opposite

Flow capacity

The flow capacity of the Icopal 125mm rainwater system is set out in the Table below:

Outlet in the centre Outlet at one end

ERA m2 litres per second ERA m2 litres per second

Laid to fall 125m2 1.37 65m2 1.37

1:350*

*recommended

Example:

5m plan width x 9m long x 1.384

(multiplication factor for a roof 37.5°)

= 62.28m2

The table above shows the largest effective roof area which should be drained into the gutter. These sizes are for a gutterwhich is laid to a nominal fall of 1:350 and where the distance from a stop end to the outlet is not more than 50 times thewater depth. At greater distances the capacity of the gutter should be reduced in accordance with the recommendations ofBS EN 12056-3: 2000 Gravity drainage inside buildings.

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Abutments to vertical surfaces

Where pitch roofs abut vertical walls, wind

driven rain is likely to increase the catchment

area. Allow for this by adding half the vertical

surface area of the wall to the effective roof

area of the sloping roof.

RAINFALL INTENSITY

For the UK the Building Regulations 2002

Approved Document H Part H3

recommends adopting for calculation

purposes a rainfall intensity of

0.021litres/second per square metre of the

effective roof area (ERA).

To calculate flow in litres/second multiply

effective roof area by rainfall intensity.

Example:

Using same dimensions as before:

62.28 x 0.021 = 1.31 litres/second

Further Design Considerations

The following factors should also be taken

into account when checking the suitability of

any guttering system.

n Gutters fixed at a fall of 1:350 provide a

better flow performance than gutters fixed

level.

n Total length of slope of gutter to outlet

should ideally not exceed 10m.

n A gutter run with an outlet centrally

positioned has approximately twice the

flow capacity of an outlet positioned at

the end of a gutter run.

n Due to the concentrated discharge that is

likely at valleys, it is good practice to

position an outlet adjacent to the internal

angle.

n External and internal corners by nature

restrict the flow performance of the gutter

system. The amount of restriction

depends on many variables, which need

to be factored into your calculations. It is

also recommended that wherever

possible an outlet is positioned adjacent

to corners.

n The above information is intended as a

general guide only. Each configuration of

a guttering system is unique and many

other factors may need to be taken into

account. For further more detailed design

advice please refer to BS EN 12056-3:

2000 Gravity drainage inside buildings.

ApplicationguidancePOSITIONING OF GUTTER AT EAVES

Position gutter so as to prevent rainwater

discharge overshoot.

Falls

A fall of 1:350 is recommended. Too steep a

fall should be avoided, as this will lead to an

excessive gap between the lowest edge of

the roof and the top of the gutter).

The highest point of fall should be at a stop

end or the centre point of gutter between

two outlets. It is recommended that gutter

lengths longer than 10m should slope from

the centre to the outlets at either end of the

run.

In all cases, roof felting or eave guard should

be extended to just below the top edge of

the gutter to prevent wind blowing water

behind the gutter.

The roof covering should not extend so far

into the gutter as to prevent easy cleaning

and maintenance.

Care should be taken to ensure that there is

no sideways tilt of the gutter as this reduces

the gutter capacity.

GUTTER SUPPORT

Fascia brackets

Fasten Icopal gutter fascia brackets with 4-

no. galvanised or bright zinc plated screws

of an appropriate size, at max. 800mm -

1000mm centres.

Where roof eaves ventilation systems are top

mounted on fascia boards:

n Install an additional Icopal gutter spacer

between the gutter fascia bracket and the

fascia board to maintain the necessary

ventilation air passageway into the throat

of the eaves ventilation system.

n Icopal gutter spacer 10 & gutter spacer

25 are available to complement

10,000mm2 ventilation and 25,000mm2

systems respectively.

Rafter brackets

Fasten rafter brackets with 3-no. galvanised

or bright zinc plated screws min. 25 mm

long x 6 mm, at max. 600mm centres.

Angles and outlets

Fit additional Icopal fascia or rafter brackets

at or near angles and outlets to prevent

sagging.

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GUTTER JOINTS

Use Icopal Gutter Unions to form joints

between length of Icopal gutter and to

incorporate internal/external angles. Support

joints with Icopal fascia or rafter brackets,

fixed max. 150 mm from the union.

Install Gutter Unions by hooking the back

edge of the Gutter Union over the top back

edge of gutter and then placing the front

edge over the front rolled lip of the gutter.

Then press the integral Gutter Union clip and

lock securely in position with the locking tab.

STOP ENDS

Use Icopal Universal Stop Ends at

termination of gutter. Support each Stop

End with Icopal Fascia or Rafter Brackets

fixed max. 150 mm from the Stop End.

Apply a bead of silicon sealant at end of

gutter to provide a secure watertight joint

between the gutter and the Stop End unit.

All faces to be jointed should be clean and

dry.

Install Universal Stop Ends by inverting unit

by 180º and sliding rolled lip of unit approx.

12mm into the front rolled lip of the gutter.

Then turn Stop End unit through 180º and

push down into sole of gutter; when in this

position the internal overlap of the Stop End

will lock under the small lip at the back edge

of the gutter. Push unit fully into the body of

the gutter.

To finish, break off the rear superfluous rolled

lip of the Stop End unit along its scribed

fracture line; fold the remaining projecting

vertical locking tab over the back edge of

the gutter.

RUNNING OUTLETS

Downpipe running outlets may be placed at

any point along the gutter without the need

to create a break in the running length.

Prior to installation:

Measure gutter and mark the centre line

position of where the downpipe is to be

fitted. Using a hacksaw, cut two angled slots

at a 45º angle 50mm from the marked

centreline position, forming a 100mm “V”

shaped opening in the sole of the gutter.

Crimp cut edge down into outlet by

approximately 5mm.

Installing the outlet:

Install Icopal Running Outlet, hooking the

front edge of the running outlet over the top

front rolled edge of gutter and then placing

the back edge over the back edge of the

gutter. Fold tabs on back edge of Running

Outlet over small lip at back of gutter into

the gutter.

1 2

3 4

5 6

7 8

9 10

11 12

13

15

14

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DOWNPIPES

Icopal Rainwater Downpipes push-fit onto

the spigot of gutter running outlets. Lengths

of pipe are joined via a flush-fit internal

socket, allowing unimpeded drainage flow.

Ensure the internal socket is always at the

lower end of the pipe. Support joints in

downpipe by fixing Downpipe Brackets max.

150mm from joint.

Downpipe support

Downpipes are secured to the wall with

Icopal Downpipe Brackets. These open

fronted brackets hold the pipe securely by

means of a snap-lock clasp. This simplifies

installation by allowing unobstructed access

to fixing points during installation. It has the

additional benefit of allowing downpipes to

be released for maintenance work to the

wall without having to remove any fixing

screws.

Fix Downpipe Brackets to the wall with 2no.

galvanised or bright zinc plated screws.

Where pipes exceed 2m in length, fit an

Icopal Intermediate Downpipe Bracket. After

installation of the bracket, slot the Downpipe

into the open front of the bracket and lock in

place with snap-lock clasp.

Offsets

Form offset bends (swan necks) using 2no.

75º Icopal Offset Bends.

Icopal Offset Bends are tapered and are

designed for an interference fit to each other

or to outlets and downpipes. Ensure that the

narrowest end of the Offset Bend is always

at the lower end of the pipe.

By combining Icopal Offset Bends with an

Icopal Middle Section Pipe (0.5m short

length of pipe) a wide variety of angles and

soffit overhangs can be successfully formed.

See Table below.

Downpipe termination

The Icopal Rainwater Shoe diverts rainwater

away from the building for drainage via a

gully.

Downpipes may also be connected directly

to underground drainage systems by use of

Icopal Sliding Pipe (340mm), Icopal

Downpipe Drain Trap and Universal Drain

Trap Sleeve.

Linear Relationship Between Icopal Offset Bend 75º & Icopal Middle Section

Length of Projection (Distance from Length of Icopal Middle Section Vertical height from base of gutter to

wall to rear base of outlet) Pipe required to bridge gap bottom end of lower offset bend

200mm Not Required 380mm

300mm 160mm 420mm

400mm 270mm 460mm

500mm 370mm 510mm

600mm 470mm 560mm

700mm 580mm 610mm

800mm 690mm 660mm

This table shows the lengths of middle pieces for Icopal Offset Bend 75º and different roof soffit projections

16 17

18 19

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Estimating and ordering

The tables on the following pages are

designed to aid specifiers, quantity

surveyors and contractors calculate the

correct number of tiles required for a

project.

An example calculation is provided on

page 128.

Estimating serviceDecra Technical Services provide a full

estimating service and project specification.

Please contact Technical Services for details:

Telephone: 01293 545058

Fax: 01293 562709


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Estimating guide

Decra Classic & Elegance

Rafter length to Number of Roof length Numbersuit full courses tile courses using barge of tilesof tile including covers requiredfascia*0.330 1 1.365 10.695 2 2.625 21.065 3 3.885 31.435 4 5.145 41.805 5 6.405 52.175 6 7.665 62.545 7 8.925 72.915 8 10.185 83.285 9 11.445 93.655 10 12.705 104.025 11 13.965 114.395 12 15.225 124.765 13 16.485 135.135 14 17.745 145.505 15 19.005 155.875 16 20.265 166.245 17 21.525 176.615 18 22.785 186.985 19 24.045 197.355 20 25.305 207.725 21 26.565 218.095 22 27.825 228.465 23 29.085 238.835 24 30.345 249.205 25 31.605 259.575 26 32.865 269.945 27 34.125 2710.315 28 35.385 2810.685 29 36.645 2911.055 30 37.905 3011.425 31 39.165 3111.795 32 40.425 32

Decra Plus Tile

Rafter length to Number of Roof length numbersuit full courses tile courses using barge of tilesof tile including covers requiredfascia*0.330 1 1.344 10.695 2 2.604 21.063 3 3.884 31.431 4 5.124 41.799 5 6.384 52.167 6 7.644 6

Rafter length to Number of Roof length Numbersuit full courses tile courses using barge of tilesof tile including covers requiredfascia*2.535 7 8.904 72.903 8 10.164 83.271 9 11.424 93.639 10 12.684 104.007 11 13.944 114.375 12 15.204 124.743 13 16.464 135.111 14 17.724 145.479 15 18.984 155.847 16 20.244 166.215 17 21.504 176.583 18 22.764 186.951 19 24.024 197.319 20 25.284 207.687 21 26.544 218.055 22 27.804 228.423 23 29.064 238.791 24 30.324 249.159 25 31.584 259.527 26 32.844 269.895 27 34.104 2710.263 28 35.364 2810.631 29 36.624 2910.999 30 37.884 3011.367 31 39.144 3111.735 32 40.404 32

Decra Stratos

Rafter length to Number of Roof length numbersuit full courses tile courses using barge of tilesof tile including covers requiredfascia*0.280 1 1.360 10.595 2 2.590 20.915 3 3.820 31.235 4 5.050 41.555 5 6.280 51.875 6 7.510 62.195 7 8.740 72.515 8 9.970 82.835 9 11.200 93.155 10 12.430 103.475 11 13.660 113.795 12 14.890 124.115 13 16.120 134.435 14 17.350 14

*Exact rafter lengths will depend upon type of gutter and ridge cap selected

1. The Tables below are for estimatingpurposes only. The figures quoted are basedon nominal tile dimensions and are subject tonormal manufacturing tolerances.

2. Count all fractions of tiles as whole tiles.

3. The Tables assume a simple mono-pitchor duo-pitch roof construction. Morecomplicated roof structures will entail an

additional wastage. We suggest an additionalestimating figure of approx. 1.32 tiles x totallinear metres of hips and valleys.

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Rafter length to Number of Roof length Numbersuit full courses tile courses using barge of tilesof tile including covers requiredfascia*4.755 15 18.580 155.075 16 19.810 165.395 17 21.040 175.715 18 22.270 186.035 19 23.500 196.355 20 24.730 206.675 21 25.960 216.995 22 27.190 227.315 23 28.420 237.635 24 29.650 247.955 25 30.880 258.275 26 32.110 268.595 27 33.340 278.915 28 34.570 289.235 29 35.800 299.555 30 37.030 309.875 31 38.260 3110.195 32 39.490 32

Decra Oberon

Rafter length to Number of Roof length numbersuit full courses tile courses using barge of tilesof tile including covers requiredfascia*0.280 1 1.330 10.595 2 2.580 20.915 3 3.830 31.235 4 5.080 41.555 5 6.330 51.875 6 7.580 62.195 7 8.830 72.515 8 10.080 82.835 9 11.330 93.155 10 12.580 103.475 11 13.830 113.795 12 15.080 124.115 13 16.330 134.435 14 17.580 144.755 15 18.830 155.075 16 20.080 165.395 17 21.330 175.715 18 22.580 186.035 19 23.830 196.355 20 25.080 206.675 21 26.330 216.995 22 27.580 22

Rafter length to Number of Roof length Numbersuit full courses tile courses using barge of tilesof tile including covers requiredfascia*7.315 23 28.830 237.635 24 30.080 247.955 25 31.330 258.275 26 32.580 268.595 27 33.830 278.915 28 35.080 289.235 29 36.330 299.555 30 37.580 309.875 31 38.830 3110.195 32 40.080 32

Parctile

Rafter length to Number of Roof length numbersuit full courses tile courses using barge of tilesof tile including covers requiredfascia*0.330 1 1.365 10.695 2 2.615 21.065 3 3.865 31.435 4 5.115 41.805 5 6.365 52.175 6 7.615 62.545 7 8.865 72.915 8 10.115 83.285 9 11.365 93.655 10 12.615 104.025 11 13.865 114.395 12 15.115 124.765 13 16.365 135.135 14 17.615 145.505 15 18.865 155.875 16 20.115 166.245 17 21.365 176.615 18 22.615 186.985 19 23.865 197.355 20 25.115 207.725 21 26.365 218.095 22 27.615 228.465 23 28.865 238.835 24 30.115 249.205 25 31.365 259.575 26 32.615 269.945 27 33.865 2710.315 28 35.115 2810.685 29 36.365 2911.055 30 37.615 3011.425 31 38.865 3111.795 32 40.115 32

*Exact rafter lengths will depend upon type of gutter and ridge cap selected

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Decra roof systems

1. Estimating tiles for a straight gable

roof (see figure 1 for a working

example).

(a) Calculate number of tiles along overall

length of roof from the appropriate tile

coverage table.

(b) Calculate number of courses up rafter

from the appropriate coverage table.

(c) Multiply tiles (a) by tiles (b) x number of

slopes.

(d) If using Decra Stratos or Oberon tile

profiles additional wastage will be required at

the gables to break bond on tiles. Calculate

the total linear meterage of gable/verge and

abutment wall and then multiply the result by

the wastage factor of 0.4 tiles per each

metre.

NB. Ensure all fractional tiles are counted as whole tilesfrom tile coverage table.

2. Estimating tiles for hipped roofs (see

figure 2 for a working example).

Treat the roof initially as before, multiply

number of tiles along overall length of roof

by number of courses up rafter by 2 sides.

Then add to the result 1.32 tiles (tile

wastage for cutting to hips or valleys) for

every linear metre of hip.

3. Estimating tiles for hip and valley

roofs (see figure 3 for a working

example).

Treat the roof initially as before, multiply

number of tiles along length of roof by

number of courses up rafter by 2 sides. Re-

apply this procedure for all remaining roof

areas. Then add to result 1.32 tiles for every

linear metre of hip or valley.

4. Estimating tile batten and nails.

For Classic, Parctile & Elegance Tiles

allow 2.7m of batten per m2 plus wastage.

For Plus Tiles allow 2.72m of batten

per m2 plus wastage.

For Stratos Tiles allow 3.13m of batten per

m2 plus wastage.

For Oberon Tiles allow 6.25m of batten

per m2 plus wastage.

For Classic, Parctile, Plus Tile, Stratos &

Elegance Tiles allow 6kg pack of Decra

fixing nails per every 420 tiles.

For Oberon Tiles allow 6kg pack of Decra

fixing nails per every 300 tiles.

5. Estimating Underlays.


Membrane 50m x 1.5m roll

Cover per roll: 70m2 (approx. at 100mm lap)*

67.5m2 (approx. at 150mm lap)

63.75m2 (approx. at 225mm lap)

60m2 (approx. at 300mm lap)*

Decra 300 High Performance Underlay

50m x 1m roll


42.5m2 (approx. at 150mm lap)*



Decra TwoF Economy Underlay

30m x 1m roll





*no allowance made in the above coverage’s for side lapsand any wastage.

(a) 9.97m OVERALL LENGTH

RIDGERIDGEVALLEY

HIPRIDGE

HIPBARGE 5.5m

4m

5.5m(b) 4.37m RAFTER


LENGTH(c) 3.5m

(d) 2.8m RAFTER

1.5m

(b) 4.37m RAFTER(a) 9.97m OVERALL LENGTH

(b) 4.37m


RIDGERIDGEVALLEY

HIPRIDGE

HIPBARGE 5.5m

4m



LENGTH(c) 3.5m

(d) 2.8m RAFTER

1.5m


(b) 4.37m


RIDGERIDGEVALLEY

HIPRIDGE

HIPBARGE 5.5m

4m



LENGTH(c) 3.5m

(d) 2.8m RAFTER

1.5m


(b) 4.37m

(a) x (b) x 2 slopes = Total Tiles8 x 12 x 2 Slopes = 192 Tiles

(a) x (b) x 2 slopes+ Wastage (w) = Total Tiles8 x 14 x 2 slopes = 224(w) 4 Verges x 4.37mx 0.40 Waste = 7

= 231 Tiles

Decra ClassicDecra Plus TileParctileDecra Elegance

Decra OberonDecra Stratos

Fig 1 – Straight Gable Fig 2 – Hipped Roof Fig 3 – Hip & Valley

(a) x (b) x 2 slopes = Total Tiles8 x 12 x 2 Slopes = 192 4 Hips x 5.5mx 1.32 Wastage = 29

= 221 Tiles

(a) x (b) x 2 slopes+ Wastage (w) = Total Tiles8 x 14 x 2 slopes = 224(w) 4 Hips x 5.5mmx 1.32 Waste = 29

= 253 Tiles

(a) x (b) x 2 slopes +(c) x (d) x 2 Slopes+ Wastage (w) to Hips and Valleys = Total Tiles8 x 12 x 2 Slopes = 192 3 x 8 x 2 Slopes = 4830m Hip and Valley x 1.32 Wastage = 40

= 280 Tiles

(a) x (b) x 2 slopes +(c) x (d) x 2 Slopes+ Wastage (w) to Hips and Valleys = Total Tiles8 x 14 x 2 Slopes = 2243 x 9 x 2 Slopes = 5430m Hip and Valley x 1.32 Wastage = 40

= 318 Tiles

DECRA SALESPrompt assistance for all order requirements:

Telephone: 01293 545058

Fax: 01293 562709


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Ordering and delivering

All Decra roofing materials are available

directly from Decra. For products and

order codes refer to the product section

within this manual.

To order, simply contact our dedicated

sales office.

With our investment in high stock levels,

almost all orders can be supplied directly

from the warehouse. This enables us to

provide a maximum delivery time of 4

working days; 2 working days is typical.

Orders can be collected with 4 working

hours notice. Our call and collect service is

open from Monday to Friday

8.30am – 5.00pm.

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Sitework

Safety and CDM Risk Assessment 132

Transport, handling, storage 133

Using Decra tools 134

Forming a top course of tiles 134

Forming a side upstand 135

Forming a raking cut at Hips & Valleys 135

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Saf

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The relevant regulations detailed in the

Health and Safety at Work Act 1974

must be adhered to on site.

C.O.S.H.H.

Decra acrylic tiles and accessories may be

considered to be inert since the emulsified

resins used in the coating process are oven

cured in manufacture. Normal care should be

taken in handling, cutting and bending to

avoid cuts or abrasions to the hands.

Operatives may prefer to wear gloves.

A full COSHH analysis of all components is

available on request.

Activity Hazard Risk Risk Level Design Option/Control Residual Risk Comments/Action

Construction

Roof tiling Working Fall or High n Ensure adequate Medium Provide details ofat height exposure to protection and fall recommended

the elements protection measures access arrangements in place.n Minimise time spentat height.n Use purpose built unitsthat are quick and easyto fit.

Handling Manual High n Specify a lighter option Medium Select appropriateroof tiles handling n Use larger panel sizes Medium Decra tile

Injuries to reduce number to be handled. Recommend loadingn Pack for handling by Low bays/platforms onmechanical means. access scaffolds

Breakage n Falls and High Use a more durable Low Specify Decra tilesof tiles slipping product

n Damage to tiles and othermaterials

Fall of n Physical High Use a lighter, less Low Specify Decra tilesmaterials injury fragile panel size which

n Damage and is less likely to fall throughbreakages gaps or shed loose pieces

Cutting n Injury to eyes High Cut using a guillotine, Medium Ensure gloves worntiles and other not abrasive wheel to protect from sharp

parts of body edgesn Dust and High Dust and noise Lownoise problems minimaln Damage to High Less risk of Low use competenttiles accidental damage operatorsn Fire risk Medium Minimal fire risk Low

Special Damage n Costly High Cutting Decra tiles Low Take care withAdaptations to existing remedial work, is simple and has low sharp edges(Vents, tiles fall of material damage risk. Cut ridges, etc.) material is easily

controlledComplex Damage, Medium Use purpose built Low Use competentadaptations time consuming modules fixers

operationsDamage Cost, loss Medium Special units should Low See Decra rangeto special of production not need modifying of optionsunits

CDM Design Risk Assessment

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Transport, handlingand storageTransport

Decra tiles and accessories are delivered to

site shrink wrapped on pallets.

Handling

Decra tiles are light yet extremely robust.

Nevertheless Decra tiles should be handled

with care and not dropped in order to avoid

the possibility of surface damage.

Decra tiles should be handled with care to

avoid scratching the surface. Ensure Decra

tiles do not come into contact with any sharp

objects.

Storage

Decra tiles should be stored on a level

surface, preferably under cover. They should

be left on the pallets as delivered until they

are required.

Decra tiles should be stored flat on the pallets

as delivered.

Activity Hazard Risk Risk Level Design Option/Control Residual Risk Comments/Action

Maintenance

Term and Working Falls of High n Specify durable product Medium Maintenance byunplanned at height personnel with low maintenance experienced

requirements. personneln Ensure details available onlyon recommended safeaccess and repairarrangements.

Hidden Slips and High Use a durable product Low Decra tiles meetdefects falls of which is not likely this criterionand/or personnel and to fracture or become fractures materials brittle

Making Additional Medium Decra tile maintenance Low Contact Decra fordamage cost and of superficial damage is informationworse structural easy with Decra finishing kit. whilst damage Major damage unlikely withattempting Decra unless in exceptionalrepair circumstances

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s The basic toolsBender & bender attachment

Forming a topcourse of tiles Insert and locate the tile

1. Position tile into the bender attachment.

2. Tile should be offered into locating tabs of

bender attachment.

3. Ensure you locate other end of tile to

adjustable tab. Tile located in position within

the adjustable tab (see yellow arrow). Lift

lever arm up to lock jaws of bender

attachment (see red arrow).

Bending technique

4. Set the Bender by tilting the bender away

from operators body, whilst supporting with

left arm (for right handed people). With other

hand take hold of handle ready to control

bending process.

5. Lock lever arm to operators side and

allow bender to rotate gently towards

operator.

6. As the bender comes to ground level

extend sweep of arm controlling the lever.

Raise lever to extent of sweep action to

create full upturn bend. Operators arm is

extending to control unit and bend of tile.

Lever in full sweep position of bent tile.

Unlock the tile

7. Carefully grip tile and pull tile out of

locating tab. Slide tile to right and lift bent

tile out and away from bender.

Tools requiredThe following tools are required to fix Decra

tiles:

n Hammer or Nail Gun

n Decra nails or screws – NB Use ONLYfixing nails or screws supplied by Decra otherwise Decra's guarantee is invalidated

n Tape or ruler

n Safety helmet

n Snips

n Pencil

n Soft soled shoes

n Decra Guillotine

n Decra Bender

n Decra Bender Attachment

Decra Guillotine

Use a Decra Guillotine to cut Decra Classic,

Decra Stratos, Oberon tile, Parctile and

Elegance tiles. NEVER use an angle grinder.

Decra Plus Tiles

For Decra Plus Tile use a reciprocating saw

with Decra Plus Cutting Blades. The

150mm blades are suitable for use with

AEG, Atlas Copco, Bosch, Black & Decker,

De Walt, Elu, Flex, Hitachi, Makita &

Metabo, Skil reciprocating saws.

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Forming a sideupstand Bending preparation

1. First, flatten downturn of tile at front

corner. Some distortion will occur with

flattening process, this is normal. Repeat

process for rear corner of tile.

Bending

2. Offer tile into jaws of bender using fingers

as stop guide for size of upturn.

3. Keeping fingers clear of vice jaws apply

controlled pressure foot to peddle bar. Jaws

will then clamp tile.

4. With tile held by jaws of bender hold

pressure on peddle and prepare to bend tile.

5. Keeping foot pressed fully on peddle,

bend tile in upward direction a full 90°, thus

forming upturn.

Forming a rakingcut & an upturnededge (Hips)(Valleys carried out in similar procedure)

Marking out.

1. Once measurements taken for hip tile

transfer measurements and mark onto tile

with scriber.

2. Bend lines are shown by two short

scribed lines at nosing area and back of tile.

3. For cutting lines indicate with continuous

scribed line using batten as guide.

4. Allow for upturn distance to suit

requirements. Remember continuous line is

cutting line two short lines are bending

reference lines.

Cutting

5. Tilt tile to suit bed of guillotine as shown.

(Don’t put fingers close to cutting blade).

6. The portion of required tile is held by the

left hand. Waste tile falls to the right of blade

when viewed from operators position.

7. Apply controlled pressure to blade and

with left hand control guide of tile against

cutting blade. Repeat operations as for

cutting valleys.

Bending preparation

8. Offer tile to bender to flatten rear upturn

and front downturn.

9. First, flatten front downturn of tile at front

corner. By positioning front downturn into

jaws of bender and applying pressure to

peddle to flatten.

10. Repeat the same procedure for rear

upturn.

Bending upturn

11. Then offer tile to scribed bending lines.

12. Apply pressure to bending jaws by foot

peddle.

13. Start to bend tile in upward direction.

14. Bend tile upwards through full 90° to

form upturn.

Decra Roof System; remember safety

n Safety first.

n Never leave a guillotine unattended with

the blade up.

n Always wear a safety helmet.

n Always wear soft-soled safety shoes.

n Always work from a safe platform or use

a safety harness.

n Always ensure tools are set up correctly

and are regularly maintained.

n Use tools safely.

n It is advisable to wear gloves to protect

hands from any sharp edges.

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140

Enq

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form

To: Decra Roof Systems Ltd

Tel: 01293 545 058

I have recently received a copy of the Decra Roof Systems

technical manual.

o Please could you arrange for a Technical Advisor to call

Please could you arrange for me to receive the

following further information:

o Decra Roof Systems installation guides and

installation video.

o Information on Decra Registered Contractors.

Please could you arrange for me to receive the

following:

o Classic tile sample

o Oberon tile sample

o Stratos tile sample

o Plus tile sample

o Elegance tile sample

o Parctile sample

o A project specification

o A materials estimate

Please complete your details:

Name:

Company:

Position:

Tel:

Address:

Postcode:

Email:

Signed:

Date:

Data Protection: The information collected herein will be maintained in a secure

database and be used solely for the purpose of marketing by Decra Roof

Systems Ltd (The Company), being the purpose for which it was collected in

accordance with the Data Protection Act 1998. No information will be released

by the company to third parties without your prior consent. If you wish to have

a record of information held by the Company pertaining to yourself, please

apply in writing to the Data Controller on the fax number below, a charge of

£10.00 will be made for this service. If you do not wish to receive future

mailings from the Company please tick this box o

Please note it can take up to five working days to remove your details,

please disregard any communications that you may receive in this time.

Fax back – +44 (0)1293 562709

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Recommendations about the methods, use of materials and construction details are given as

a service to designers and contractors. These are based on the experience of Decra with the

use of Decra tiles, rainwater goods and accessories. Any drawings are meant only to illustrate

typical applications and should not be taken as a basis for final roof design without

appropriate adaptation being made. The Decra roof system should only be installed where

the new or existing roof structure is in a satisfactory condition and is built in accordance with

accepted building practice. It is the client's responsibility to satisfy her/himself that the roof is

structurally sound and that local conditions and current Health and Safety Regulations have

been taken into account before any contract is undertaken.

In particular, no responsibility is accepted by Decra Roof Systems Ltd for the systems in

which Decra tiles are used or the method of application by which it is installed. The legal

obligations of Decra in respect of any sale of Decra tiles shall be determined solely by the

terms of the respective sales contract.

Decra Roof Systems Ltd are committed to a policy of continual improvement in our services

and product range. We reserve the right to change product specifications. When specifying

Decra products it is important to follow the most recent advice and recommendations.

Contact Decra or visit our website at www.decra.co.uk

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Index

AAbutments 92

n Chimney abutments 92

n Side abutments 92

n Top edge abutments 92

Approvals 67

BBatten sizing 76

Bending tiles 134

Breather membranes 75

n Decra 700 61

CCAD Drawings 10, 72

CDM Risk Assessment 132

CPD 10

Changes in roof pitch 116

Classic Tile 34

n Introduction and Data 34

n Product Range 4, 33, 36

Composition and manufacture 67

Cutting tiles 69, 134

Cut edges 69

DDecraVent ventilation units 58

Delivery 11, 129

EEaves 86

n Eaves construction guide 84, 86

n Eaves protection systems 62, 86

n Ventilated eaves details 86

Elegance Tile 54

n Introduction and data 54

n Product range 4, 33, 56

Estimating 125

n Estimating tables 126

n Estimating service 125

Environment 16, 74

Exposure and wind loading 16, 74

FFlat to pitched roof

conversions 26, 74

GGables 90

Gas flue ridges 59, 118

Guarantee 9, 12, 15

Guillotine 66, 134

Gutter system 64, 120

HHandling 133

Hips 104

n Unventilated 104

n Ventilated 106

IIcopal rainwater system

n Design considerations 120


n Product range 64

LLow pitched roofs 74

MMansards 116

Membranes 75

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OOberon Tile 46



Ordering 11, 129

PParctile 50



Plus Tile 38




RRidges 96

n Gas flue 118

n Unventilated 96

n Ventilated 98

n Monopitch 102

SSafety 132

Sitework 131

Specification service 6, 10, 125

Stratos Tile 42



TTechnical support 6, 10, 125

Tools 66, 134

Training 10

UUnderlays 60

n Decra 300 underlay 60

n Decra TwoF underlay 60

n Design considerations 75, 79

n Underlay tapes 61

VValleys 108

n Lead 109

n GRP 109

Velux windows 110

Vertical tiling 114

Ventilation and control

of condensation 58

n Design considerations 78

n Eaves vent system 58

n Gas flue ridge units 58, 118

n In-line air vent tiles 58, 88

n Ridge and Hip ventilation units 58

n Soil/Mechanical extract vents 58

n Detailing 84

n Ventilated Eaves 84

n Ventilated Hips 58, 106

n Ventilated Ridges 58, 98

Verges 90

WWarm roof insulated tile

support system 63

brosura decra august 06 (en)

Documents

decra system

thenumber of decra tiles

manufacturing plants

decra roof systems ltdunit

introductiondecra roof

ventilation systems

entire roof

popularlightweight tile