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Timspec CERTCLAD Weatherboards

Vertical Shiplap Cavity System

with Rigid Air Barrier

Installation Manual

TABLE OF CONTENTS

Scope.................................................................... 1

Health and Safety .................................................. 6

Site Preparation ..................................................... 7

Pre-Installation ..................................................... 8

Materials - Critical System Components ................. 9

Materials - Accompanying Elements ..................... 42

Installing Rigid Air Barrier .................................... 46

Installing Cavity Battens ....................................... 47

Fixing Details for Weatherboard ........................... 50

Inter-Storey Cavity Junctions ................................ 53

Within-Board Joins............................................... 55

External 90° Corner Details .................................. 57

External 135° Corner Details ................................ 65

Internal 90° Corner Details ................................... 67

Internal 135° Corner Details ................................. 73

Bottom Plate (Base of Wall) Details ........................ 75

Deck Details ........................................................ 78

Top Plate (Top of Wall) Details .............................. 80

Parapet/Enclosed Balustrade Details ..................... 85

Pipe Penetration Details ....................................... 92

Meter Box ........................................................... 94

Aluminium Joinery ............................................... 98

Site Clean-up .................................................... 106

On-going Maintenance ...................................... 107

Important Points ................................................ 109

SCOPE

INTENDED USE

This Vertical Shiplap Weatherboard Cavity System has been designed for use as cladding for

residential and small commercial buildings. It is only suitable for buildings with a ‘Risk Score’

of 20 or below as per the ‘Risk Matrix’ outlined in E2/AS1. Refer to the Department of Building

and Housing’s booklet titled ‘External moisture - a guide to using the risk matrix’ for more

information.

This is an Alternative Solution in terms of NZBC compliance.

VALIDITY

CodeMark certification is only valid when all products in the weatherboard system are

CERTCLAD branded or Timspec approved and all methods and procedures outlines in this

manual are followed. This is to ensure that all products are up to the standards required by

CodeMark and are installed in the correct manner.

SCOPE (CONTINUED)

PERFORMANCE

When installed and maintained as specified in this manual and the work is done by a qualified

tradesman using accepted trade practices, it will meet the applicable sections of the following

requirements of the NZBC (New Zealand Building Code as contained in the Building Regulations

Act 1992):

B1 Structure

B2 Durability

E2 External Moisture

F2 Hazardous Building Materials

This is evidenced by conformance with the objectives of the following Department of Building

and Housing Compliance documents:

B1/AS2 (amendment 10, effective from 19 May 2011)

B2/AS1 (amendment 7, effective from 4 April 2011)

F2/AS1 (amendment 2, effective from 1 December 2000)

Compliance with E2 (External Moisture) has been shown by successfully passing E2/VM1

testing. This assessment was performed by a product testing engineer at an approved

laboratory. A copy of the testing summary is available on request.

SCOPE (CONTINUED)

WIND ZONES

This solution is only acceptable for wind zones up to and including ‘Extra High’ as defined in

NZS 3604 (New Zealand Standard 3604:2011 Timber Framed Buildings).

Note: Wind zones up to ‘Very High’ do not require a Rigid Air Barrier; you may use our Vertical

Shiplap Cavity System (without Rigid Air Barrier) which has a sperate installation manual.

MASS

The mass of Timspec Vertical Shiplap Weatherboard is approximately 16.2 kg/m2 and

therefore is considered a Light Wall Cladding by NZS 3604.

Weatherboard

Material

Timber Density

(Air Dried)

Approx Cladding Mass

(Weatherboard, Cavity Battens

and Rigid Air Barrier)

Accoya® wood 512 kg/m3 13.8 - 20.2 kg

Radiata Pine 500 kg/m3 13.7 - 20.2 kg

Western Red Cedar 385 kg/m3 11.4 - 17.7 kg

LIFESPAN

M INIMUM L IFE

This Vertical Shiplap Weatherboard Cavity System will have a minimum life of 15 years as

required by NZS 3602 (New Zealand Standard 3602:2003 Timber and wood-based products for

use in building) given normal maintenance.

SCOPE (CONTINUED)

LIFESPAN (CONTINUED)

SERVICEABLE L IFE

In addition to the above minimum life, this Vertical Shiplap Weatherboard Cavity System is

expected to have a serviceable life of at least:

50 years for Accoya® wood; or

15 years for H3.1 treated Radiata Pine when painted; or

25 years for H3.2 treated Radiata Pine when stained/oiled; or

40 years for H3.2 treated Radiata Pine when painted; or

40 years for Western Red Cedar when coated.

This serviceable life is subject to the coating and maintenance requirements below. More

importantly some timber boards may require replacement over the lifetime of the cladding as

part of normal maintenance.

COATING REQUIREMENTS

To achieve the above serviceable life for Western Red Cedar all faces (hidden and exposed)

must be coated with a minimum of one coat of a suitable penetrating oil or stain and all

exposed faces must be coated with a further two coats, refer to page 25 for more information.

For Radiata Pine with a dressed surface all faces (hidden and exposed) must be coated with

one coat of primer and all exposed faces coated with a further two coats of a suitable topcoat,

refer to page 19 for more detail.

For a band sawn surface all faces (hidden and exposed) must be coated with a minimum of one

coat of a suitable penetrating oil or stain and all exposed faces must be coated with a further

two coats, refer to page 20 for more detail.

SCOPE (CONTINUED)

LIFESPAN (CONTINUED)

MAINTENANCE REQUIREMENTS

The above serviceable life assumes regular maintenance. Appearance will degrade over time

unless timber is coated and both the coatings and all aspects of the cladding system are

maintained.

Please refer to the On-Going Maintenance section on page 107 for more information about the

required maintenance.

HEALTH AND SAFETY

CUTTING OF TIMBER

Cutting of timber is to be done in a well ventilated area and a suitable dust mask, eye

protection, and ear protection must be worn.

COATING AND PRIMING

Coating and priming is to be done in a well ventilated area, refer to the coating/primer

supplier for all matters relating to health and safety. All relevant sections of

AS/NZS 2311:2009 (Guide to the painting of buildings) and all of the coating manufacturer’s

requirements are be adhered to.

SITE PREPARATION

STRUCTURE AND FRAMING

NEW ZEALAND STANDARD 3604

Generally, the timber framing must comply with NZS 3604 (Timber-framed buildings), however

where specific engineering design is required the framing shall be at least of equivalent

stiffness as the framing provisions of NZS 3604.

Timber framing members must be minimum 90 x 45mm in size. The 45mm minimum face

width is essential for rigid air barriers to fix to.

LAYOUT

Studs must be at a spaced at a maximum of 600mm between centres. Dwangs (nogging) must

be spaced at a maximum of 480mm between centres. Studs and dwangs must form a flush

plane for cavity battens and weatherboards to be fixed to.

Additional framing may be required at soffits, corners, and penetrations such as window and

door openings.

MOISTURE CONTENT

The moisture content of the framing must not exceed 20% at the time of fixing the

weatherboard as problems may occur later due to excessive timber movement if framing is too

wet.

PRE-INSTALLATION

ON-SITE STORAGE AND HANDLING

Care must be taken to ensure that timber and accessories are kept clean and dry, and are not

damaged whilst in storage awaiting application.

Extra care is to be taken while handling timber to ensure that they are not damaged.

Timber is to be stacked on flat level bearers/dunage that are a maximum of 900mm apart and

at least 100mm off the ground. Timber should either be stored inside an enclosed building or

covered and protected from the elements when stored outside.

Important: Timber weatherboards should not be installed if their moisture content is

outside the range of 14 - 18%.

DOCKING OUT DEFECTS

Before coating or installing boards, check for any defects that may require docking out.

Important: All docked ends of stained or painted weatherboards will require priming

with a minimum of one coat of primer or stain.

PRIMING AND SEALING (APPLIES TO STAINED OR PAINTED WEATHERBOARDS ONLY)

Apply the first coat of stain or primer to all sides and edges of the weatherboard prior to

installation. Remember that all docked ends will require priming as noted above. Follow the

coating manufacturer’s directions and ensure further coats are applied as required. All

relevant sections of standard AS/NZS 2311:2009 (Guide to the painting of buildings) should be

adhered to.

Note: It is usually easier to order your weatherboards to arrive on-site

preprimed/precoated.

MATERIALS - CRITICAL SYSTEM COMPONENTS

CRITICAL SYSTEM COMPONENTS

IMPORTANT: All critical system components must be supplied by or approved by Timspec.

This is to ensure that all items are up to a suitable standard and to ensure the compatibility

and suitability of all items. Any alternative or competitor supplied product will invalidate the

CodeMark certification.

The Critical System Components are:

Timbers

o Accoya wood

o Radiata Pine

o Western Red Cedar

Accoya wood Weatherboards

Radiata Pine Weatherboards

Western Red Cedar Weatherboards

Rigid Air Barrier

o CHH EcoPly Barrier

o Innova Durabarrier

o James Hardie RAB Board

o or other similar product

Mouldings and Profiles

Cavity Battens

o Castellated Cavity Battens

o Cavibat Cavity Battens

Flashings

Nails

MATERIALS - CRITICAL SYSTEM COMPONENTS (CONTINUED)

TIMBER SPECIES: ACCOYA ® WOOD

MATERIAL

New Zealand grown Radiata Pine modified to the core by a non-toxic, proprietary acetylation

process, sold by Timspec under the trade name ‘Accoya wood’.

About Acetylation

Accoya woods exceptional durability is a result of the acetylation process. Acetylation is a

chemical process which effectively changes the free hydroxyls (chemical groups that readily

absorb and release water, causing shrinkage and swelling) within the wood into acetyl groups.

This is done by reacting the wood with acetic anhydride, which comes from acetic acid (known

as vinegar when in its dilute form). When the free hydroxyl group is transformed to an acetyl

group, the ability of the wood to absorb water is greatly reduced, rendering the wood more

dimensionally stable and extremely durable.

DURABILITY

Accoya is class one durable, furthermore it is guaranteed not to rot for 50 years in above-

ground applications.

For the purpose of this guarantee, rot is defined as fungal decay that materially damages the timber caused by the soft-rot fungal

species: Poria placenta, Coniophora puteana, Gloeophyllum trabeum, Corriolus versicolor or Serpula lacrymans but does not

include common surface mould, mildew or any other organism either bacteria or fungi.

Scion (New Zealand Forest Research Institute) compared Accoya to commonly used hardwoods,

H3.2 and H4 CCA treated Radiata Pine as both ground contact stakes and fungus cellar

stakelets (an accelerated decay environment). In both tests Accoya dramatically outperformed

the durability of all the other timbers (including H4 treated Pine). The report “The Durability of

Accoya Radiata Pine Sapwood Results from Ground Contact Tests after Five Years Exposure” is

available from www.accoya-timspec.co.nz.


TIMBER SPECIES: ACCOYA ® WOOD (CONTINUED)

MATERIAL RESOURCE

FSC Certified - All Accoya® wood supplied from Timspec is from New Zealand grown FSC

Certified resources and is sold under the Mixed Credit classification.

About FSC

The Forest Stewardship Council (FSC) is an independent, non-governmental, not-for-profit

organisation established to promote the responsible management of the world’s forests. FSC

has 10 principles and 56 associated criteria which describe how forests have to be managed in

order to meet the social, economic, ecological, cultural and spiritual needs of present and

future generations.

They include managerial aspects, chain-of-custody requirements, as well as environmental

and social requirements. FSC rules are the strictest and FSC’s social and environmental

requirements are the highest of any certification scheme. This is probably why FSC is the only

forest certification system that is supported by all major environmental groups.

COATING

We recommend a fungicidal coating be applied to prevent unsightly (but non-detrimental)

surface mould.

IMPORTANT NOTES

Accoya wood has higher acidity levels than most timber and will cause oxidization or corrosion

when in direct contact with certain metals and moisture. Do not use Accoya in direct contact

with copper, galvanized steel, powder-coated aluminium, zincalume, or zinc plated steel.

Stainless Steel (304 or 316) or brass fastenings and fixings must be used as these will not

degrade like other metals.


TIMBER SPECIES: RADIATA PINE

MATERIAL

New Zealand grown Radiata Pine (Pinus radiata) which has been preservative treated to either

an H3.1 (LOSP) or an H3.2 (ACQ, CCA, etc) level.

DURABILITY

H3.1 treated Radiata Pine has an above-ground durability of 15 years when adequately

painted.

H3.2 treated Radiata Pine has above-ground durability of 25 years when adequately stained.

H3.2 treated Radiata Pine has above-ground durability of 40 years when adequately painted.

MATERIAL RESOURCE

FSC Certified where available - Radiata Pine supplied from Timspec is New Zealand grown and

from a mixture of FSC Certified resources and non-contentious resources, please refer to

invoice for details.

COATING

Dark colours attract more heat which will exacerbate any timber movement and/or resin bleed.

For this reason we recommend the use of coatings with a colour which has a LRV (light

reflective value) of 45% or more. Refer to coatings section on pages 19 and 20 for more

information.

IMPORTANT NOTES

Timber treated with a copper-based treatment (ACQ, CCA, etc) should not be in contact with

metal wall claddings as this may lead to corrosion.


TIMBER SPECIES: WESTERN RED CEDAR

MATERIAL

North American grown Western Red Cedar (Thuja plicata).

DURABILITY

Western Red Cedar is naturally durable for 25 years; however some boards will require

replacement during this time.

MATERIAL RESOURCE

FSC or PEFC Certified where available - Western Red Cedar supplied from Timspec is North

American grown and from a mixture of FSC Certified, PEFC Certified resources and non-

contentious resources, please refer to invoice for details.

COATING

No coating is required, however a coating and will dramatically improve the appearance,

performance and durability of the cladding. Timspec recommend a coating system comprising

a base coat of a suitable penetrating oil or stain to all faces (hidden and exposed) of the

weatherboard followed by two top coats to all exposed faces.

Dark colours attract more heat which will exacerbate any timber movement, for this reason we

only recommend light colours. Refer to coatings section on page 25 for more information.

IMPORTANT NOTES

Careful board selection will help improve the lifespan of your cladding. Quarter sawn boards

should be selected for use in higher exposure areas, such as north facing walls and lower parts

of the wall (where boards are less protected by eaves).


ACCOYA® WOOD VERTICAL SHIPLAP WEATHERBOARDS

Note: Refer to page 10 for information about Accoya wood as a timber.

COATING REQUIREMENTS

We recommend a fungicidal coating be applied to prevent unsightly (but non-detrimental)

surface mould.

PROFILE DRAWINGS


ACCOYA® WOOD VERTICAL SHIPLAP WEATHERBOARDS (CONTINUED)

PROFILE DRAWINGS


ACCOYA® WOOD VERTICAL SHIPLAP WEATHERBOARDS (CONTINUED)

CUSTOM PROFILES

Our vertical Shiplap Weatherboard system also includes any custom vertical shiplap profile that

meets all of the following requirements:

Thickness of 19mm; and

Overall width between 90 and 190mm (inclusive); and

Minimum 25mm overlap with 6 x 3mm anti-capillary grooves 10mm in from the edge of

the lap; and

Minimum 2mm expansion gap between boards.


RADIATA PINE VERTICAL SHIPLAP WEATHERBOARD

Note: Refer to page 12 for information about Radiata Pine as a timber.

COATING DRESSED AND/OR H3.1 TREATED WEATHERBOARDS

H3.1 treated Radiata Pine must have a dressed surface and must be coated with a minimum

one coat of primer and two further coats of a suitable alkyd or 100 percent acrylic paint. All

relevant sections of standard AS/NZS 2311:2009 (Guide to the painting of buildings) should be

adhered to.

We recommend that weatherboards arrive onsite with one coat of Dulux Ultraprime already

applied.

All cut ends must be coated with a minimum of one coat of primer before installation.

Immediately after fixing the weatherboards, all nail holes should be filled and spot-primed.

As soon as possible after fixing the weatherboards they should be over-coated with a

minimum of two coats of a suitable premium paint. Follow the paint manufactures directions.

If the weatherboard has been exposed to the elements for an extended period of time

(generally 4 weeks) or if there is evidence of the primer chalking, then repriming will be

necessary. This involves sanding the primer back to a sound surface and re-priming using a

premium oil based primer.


RADIATA PINE VERTICAL SHIPLAP WEATHERBOARD

COATING BAND SAWN, H3.2 TREATED WEATHERBOARDS

Note: Where H3.2 treated Radiata Pine has a dressed surface, it must be painted according to

the directions previously mentioned for dressed and/or H3.1 treated weatherboards.

Where H3.2 treated Radiata Pine has a band-sawn surface all faces (hidden and exposed) must

be coated with a minimum of one coat of a suitable penetrating oil or stain and all exposed

faces must be coated with a further two coats. Care must be taken to ensure that all cut-outs,

holes and docked ends are sufficiently coated.

Please be aware that a stain or penetrating oil will not last as long as a painted product.

PROFILE DRAWINGS


RADIATA PINE VERTICAL SHIPLAP WEATHERBOARD (CONTINUED)

PROFILE DRAWINGS


RADIATA PINE VERTICAL SHIPLAP WEATHERBOARD (CONTINUED)

CUSTOM PROFILES

Our vertical Shiplap Weatherboard system also includes any custom vertical shiplap profile that


Thickness of 19mm; and



the lap; and



WESTERN RED CEDAR VERTICAL SHIPLAP WEATHERBOARD

Note: Refer to page 13 for species information about Western Red Cedar.

COATING

No coating is required, however a coating and will dramatically improve the appearance,

performance and durability of the cladding. Timspec recommend a coating system comprising

a base coat of a suitable penetrating oil or stain to all faces (hidden and exposed) of the

weatherboard followed by two top coats to all exposed faces.

Dark colours attract more heat which will exacerbate any timber movement, for this reason we

only recommend light colours.

PROFILE DRAWINGS


WESTERN RED CEDAR VERTICAL SHIPLAP WEATHERBOARD (CONTINUED)

PROFILE DRAWINGS



PROFILE DRAWINGS



CUSTOM PROFILES

Our vertical Shiplap Weatherboard system also includes custom vertical shiplap profile that


Thickness of 18.5mm; and



the lap; and



RIGID AIR BARRIERS

A rigid air barrier is a sheet product that is used in conjunction with, or replaces, the building

wrap to provide a better barrier against wind. They are generally a 6mm fibre cement sheet or

7mm plywood.

Timspec only recommend the use of a rigid air barrier board that has been assessed and

verified by a suitably competent testing organisation such as one accredited by IANZ

(International Accreditation New Zealand) or similar. On the next page are some products that

we believe are fit for purpose when installed according to the manufacturer’s directions:


RIGID AIR BARRIERS (CONTINUED)

ECOPLY BARRIER BY CARTERHOLTHARVEY

A 2440x1200x7mm or 2745x1200x7mm Radiata DD construction grade plywood that has

been H3.2 CCA treated. It has been independently tested to 4.5 kPa ultimate limit and 3.3 kPa

serviceability limit as per AS/NZS:4284 (Testing of Building Facades).

Product information is available at www.chhwoodproducts.co.nz/ecoply-barrier and their

Specification Manual can be downloaded from

www.chhwoodproducts.co.nz/download_library_file.cfm?l=5F54&f=2D0D19171A12040D.

RAB BOARD BY JAMES HARDIE

A 2450x1200x6mm or 3000x1200x6mm fibre cement board that has been sealed on the face

and edges. James Hardie rigid air barriers have been BRANZ appraised (refer appraisal No.

611).

Product information is available at www.jameshardie.co.nz/product/RAB-Board?i=8 and their

Specification Manual can be downloaded from

www.jameshardie.co.nz/index.php/page/8/pi_brochureid/120.

DURABARRIER BY INNOVA

A 2400x1200x6mm or 3000x1200x6mm autoclaved, cellulose fibre reinforced silica/cement

panel that has been sealed on the face and edges. James Hardie rigid air barriers have been

BRANZ appraised (refer appraisal No. 721).

Product information is available at

www.bgc.com.au/fibrecement/html/products.and.services/nz.products/durabarrier/durabarrie

r.php and their Specification Manual can be downloaded from

www.bgc.com.au/fibrecement/media/pdf/nz.products/durabarrier_nz.pdf.


FLASHINGS

MATERIAL

http://www.chhwoodproducts.co.nz/ecoply-barrier/

http://www.chhwoodproducts.co.nz/download_library_file.cfm?l=5F54&f=2D0D19171A12040D

http://www.jameshardie.co.nz/product/RAB-Board?i=8

http://www.jameshardie.co.nz/index.php/page/8/pi_brochureid/120

http://www.bgc.com.au/fibrecement/html/products.and.services/nz.products/durabarrier/durabarrier.php

http://www.bgc.com.au/fibrecement/html/products.and.services/nz.products/durabarrier/durabarrier.php

http://www.bgc.com.au/fibrecement/media/pdf/nz.products/durabarrier_nz.pdf

Flashings can be either: Galvanised Steel, Aluminium, Stainless Steel (304), or uPVC.

COMPATIBILITY

Refer to the table below to check the compatibility of Flashings and Weatherboard materials:

Weatherboard Material

Accoya

wood

H3.1 treated

Radiata Pine

H3.2 treated

Radiata Pine

Western Red

Cedar

Fla

shin

g

Mate

rial

Aluminium No Yes No Yes

Galvanised Steel No Yes Yes No

Stainless Steel (304) Yes Yes Yes Yes

uPVC Yes Yes Yes Yes

IMPORTANT

Weatherboard fixings are to not to penetrate flashings as this may provide a path for water to

track through.


FLASHINGS (CONTINUED)

DIAGRAMS



DIAGRAMS (CONTINUED )



DIAGRAMS


NAILS

MATERIAL

Nails can be either: Galvanised Steel, Silicone Bronze or Stainless Steel (316).

COMPATIBILITY

Refer to the table below to check the compatibility of Nails and Weatherboard materials:

Weatherboard Material

Accoya

wood

H3.1 treated

Radiata Pine

H3.2 treated

Radiata Pine

Western Red

Cedar

Nail M

ate

rial

Silicone Bronze Note: must be annular grooved

No Yes Yes Yes

Galvanised Steel No Conditional See Below

Conditional See Below

No

Stainless Steel (316) Note: must be annular grooved

Yes Yes Yes Yes

All of the following conditions must be met in order to use Galvanised Steel nails in Radiata

Pine weatherboards:

1. Timber treatment must be LOSP or CCA treated (this excludes ACQ or CuAz); and

2. Nails must be punched below timber surface and filled with a suitable filler to prevent

water from accessing the nail; and

3. Weatherboards must be painted as detailed in Coating H3.1 Treated Weatherboards on

page 19.


NAILS

SPECIAL CIRCUMSTANCES

Sea-spray Zones: In sea-spray zones, all nails are to be Stainless Steel as per NZS

3604 paragraph 4.2.3.

ACQ or CuAz

treated timber:

If the timber treatment is ACQ or CuAz then you must use

stainless steel nails as these treatments are more corrosive.

Rose-head, Flat-head or

Pentagon-head nails in

Radiata Pine weatherboards:

Radiata Pine weatherboards that do not have Jolt-head nails

that are punched and filled must use stainless steel nails.

Unpainted Radiata

Pine weatherboards:

All unpainted Radiata Pine must use stainless steel nails.


CASTELLATED CAVITY BATTENS

MATERIAL

H3.1 treated Radiata Pine (do not use H3.2 treated Radiata Pine for Cavity Battens).

DIMENSIONS

Machined to a finished size of 45mm wide by 20mm thick with cut-outs on alternating sides

for ventilation.

The top edge has a 20° bevel to allow water to run off, this must installed so that it slopes

towards the exterior of the building.

DIAGRAM


CAVIBAT CAVITY BATTENS

MATERIAL

Polypropylene

DIMENSIONS

Fluted polypropylene battens made by Cavibat.

Battens are 45 x 18 x 1200mm.

DIAGRAM

Refer to BRANZ Appraisal No. 524 [2007] for information about Cavibat including its

limitations and specifications.

MATERIALS - ACCOMPANYING ELEMENTS

ACCOMPANYING ELEMENTS

All items that precede the installation of the weatherboard system (building wrap, roofing

underlay, flashing tape, etc) and all consumables and items successive to the weatherboard

system (PEF backing rods, flexible sealants, etc) will not be supplied by Timspec as these are

outside their role. These items still require careful evaluation to determine their suitability and

still play a critical role as part of the cladding system.

IMPORTANT: It is the builder’s responsibility to ensure that all these accompanying items meet

the requirements and properties stated and more importantly are combatable with adjacent

materials and are fit for the intended purpose.

Accompanying Elements include such items as:

Timber Framing

Rigid Air Barrier

Building Wrap (if required)

Flashing Tape

Sealants and Adhesives

o Modified Silicone Sealant

o Epoxy (2-pot) Adhesive

o Self-expanding polyurethane foam or sealant

PEF Rod

Meter box

Internal Lining

TIMBER FRAMING

Timber framing must meet the requirements of NZS 3604 (Timber-framed buildings), or where

an alternative framing product is used it must meet the performance requirements of NZS

3604.

MATERIALS - ACCOMPANYING ELEMENTS (CONTINUED)

BUILDING WRAP

In most cases the rigid air barrier will replace a building wrap but you must check this with the

rigid air barrier manufacturer.

Where a building wrap is still required, the building wrap used must meet all the requirements

state in Table 23 (Properties of roof underlays and building wraps) of E2/AS1 (Department of

Building and Housing’s Acceptable Solution E2/AS1).

FLASHING TAPE

Timspec used FrameFlash (a BRANZ appraised flashing tape) as part of the cladding system to

prove adequacy under the E2VM1 test regime.

The designer, builder or owner may opt to use FrameFlash or a similar flashing tape provided

that any alternative product will perform as well as or better than FrameFlash. Any alternative

flashing tape should be independently assessed and verified to ensure that it will match or

exceed the performance requirements of Fast Wrap. This assessment should be completed by

a suitably competent organisation such as one accredited by IANZ (International Accreditation

New Zealand) or similar.

The flashing tape used must be compatible with all materials that it is in contact with,

specifically the building wrap.


SEALANTS AND ADHESIVES

MODIFIED SILICONE OR CO-POLYMER CONSTRUCTION SEALANT

All construction Sealants are to be a modified silicone which meets either one of the following

two standards:

Sealant must be Type F (Construction Sealants), Class 20LM or Class 25LM (20% or 25%

movement capability, low modulus) according to ISO 11600; or

Sealant must be low modulus and be Type II, Class A according to Federal Specification

TT-S-00230C.

EPOXY (2-POT) ADHESIVE

All epoxy adhesives must be a two-part epoxy adhesive, suitable for exterior use on timber,

metals and plastics

SELF-EXPANDING POLYURETHANE FOAM

All Self-expanding foams must be a rapidly expanding polyurethane foam that bonds with all

materials that it will come into contact with. The foam must not shrink and must cures to an

airtight, moisture resistant seal.

PEF ROD

PEF backing rod must be closed cell polyethylene foam specifically designed for use as a

backing rod. It should have a diameter 25% larger than the gap width and should be pushed

into the gap with a blunt tool.


METER BOX

Meter box penetrations have a higher risk of water ingress, and as such all possible steps

should be taken to minimise this risk. A good quality meter box manufactured by a leading NZ

supplier will certainty help this.

Meter boxes are to be manufactured from aluminium, hot dipped galvanised steel, glass-

reinforced plastic or other suitable rigid, UV resistant, non-combustible material. They also

must be coated on the inside and outside surfaces with a material giving a hard, durable finish

providing a service life of not less than 20 years.

The door must have a troughed lip around the front perimeter and if a drain is present is

should be made in a way to minimise water entry.

INTERNAL LINING

Internal Linings must be of a suitable size and material to provide bracing where needed and

to act as an adequate barrier to air flow.

INSTALLING RIGID AIR BARRIER

Please refer to the rigid air barrier manufacturer for installation details specific to their

product.

A flashing tape will be required to be run around the perimeter of all openings (windows,

doors, etc) and must be lapped over the rigid air barrier by 50mm. Flashing tape must also be

applied over all sheet joins - both flat and at every corner.

An expansion gap is also usually required at all sheet joins, this is generally 1-2mm for fibre

cement sheets and 2-3mm for plywood but this can vary by product so you must check with

the manufacturer for their exact specification.

Rigid Air Barrier should not be left exposed for more than 90 days.

INSTALLING CAVITY BATTENS

Cavities must comply with E2/AS1 paragraphs 9.1.8 to 9.1.9.4

Refer to Department of Building and Housing’s booklet titled ‘Constructing Cavities for Wall

Claddings’ for further information about installing cavity battens.

CAVITY BATTENS METHODOLOGY

Battens for Vertical Shiplap must be Packer cavity battens as structural battens are not

applicable:

Packer Cavity Battens: are only temporarily fixed to the framing until the weatherboard

is installed at which point the weatherboard fixing permanently fixes the cavity batten

to the framing.

SLOPE DIRECTION/ORIENTATION

VERY IMPORTANT: When using Castellated Cavity Battens ensure that the

bevelled edge is at the top and slopes away from the rigid air barrier to

direct water away from the building interior.

PRECAUTIONS

As solvents in LOSP treatments can affect bitumen used in some building papers, it is

necessary to fillet stack timber for 7 days after treatment to ensure that solvent has evaporated

before contact with any bitumen-based building paper.

INSTALLING CAVITY BATTENS (CONTINUED)

MATERIAL

As per the requirements on the materials page 40: Cavity battens are to be Cavibat 45 x 18mm

fluted battens or be H3.1 treated Radiata Pine 45 x 20mm castellated battens.

LOCATION

The cavity battens must be fixed over the rigid air barrier.

F IXING PACKER (NON-STRUCTURAL) CAVITY BATTENS

Packer cavity battens are to be fixed to the framing with either:

40 x 2.5mm flat head, hot dipped galvanised nails; or

Paslode Impulse 50 x 2.8mm ‘D’ flat head, power-driven, galvanised nails.

Packer cavity battens are to be fixed to the framing at 480mm centres.

Note: Fixing is only temporary for packer cavity battens as the weatherboard fasteners are used to permanently fix the batten.

INSTALLING CAVITY BATTENS (CONTINUED)

TOP OF WALL DETAIL

No ventilation is required at the top of the cavity. Use a horizontal D4S profile (not a

castellated or Cavibat batten) at the top of the wall to close off the top of the cavity. This

prevents damp air circulating from the cavity space into interior spaces such as roof framing or

eaves and is extremely important where the cavity finishes beneath an area that is open to a

roof space (such as a wall finishing under a soffit).

BOTTOM OF WALL DETAIL

Use a ‘Cavity Base Closure Flashing’ at the bottom of the wall to allow drainage and ventilation

but prevent the entry of vermin. This also applies where cavities end over a window, door or

other opening. Apply flashing tape to the rigid air barrier and lap into the cavity base closure.

FIXING DETAILS FOR WEATHERBOARD

F IXING METHOD

Nail placement is to be 10mm in from the side of the lap (35mm from edge of weatherboard).

The nail must not penetrate the underlapping (lower) board. Where the weatherboard profile

has a centre groove close to the lap, the nail may be only 5mm in from the side lap (30mm in

from edge of weatherboard).

Pre-drill all nail holes using a bit that is slightly smaller than the nail to prevent splitting.

Nail on an upward angle to prevent water running down the nail through the cavity.

Hand-drive all nails. Gun-driven nails are not recommended as they may damage the surface

of the timber or cause splitting or crushing damage in the battens.

Use a spacing tool on the face to ensure that all boards have a 2mm expansion gap at the back

of the boards.

NAIL SELECTION CHART

Painted Weatherboard Stained/bare Weatherboard

90 x 3.55mm jolt head nail

(to achieve minimum

35mm framing penetration)

85 x 3.25mm rose head

or pentagon head

annular grooved nail

(to achieve minimum

30mm framing penetration)

FIXING DETAILS FOR WEATHERBOARD (CONTINUED)

DIAGRAM FOR PAINTED WEATHERBOARDS WITH PACKER CAVITY BATTENS

FIXING DETAILS FOR WEATHERBOARD (CONTINUED)

DIAGRAM FOR STAINED OR BARE WEATHERBOARDS WITH PACKER CAVITY BATTENS

NOTES

Care must be taken when nailing rose head or pentagon head nails, they must be hand driven.

Too much force will damage the face of the timber.

When nailing rose head or pentagon head nails on an upward angle, care should be taken to

get the nails finishing on the face of the weatherboard.

INTER-STOREY CAVITY JUNCTIONS

USE

Cavities may be continuous up to two storeys but, due to limitations on drainage and drying,

walls over two storeys in height require a horizontal divider.

Use a ‘Z’ Flashing to break up the cavity:

For low to very-high wind zones the ‘Z’ flashing must have a 35mm upstand and

overlap the weatherboard face below by 35mm.

For extra-high wind zones the ‘Z’ flashing must have a 60mm upstand and overlap the

weatherboard face below by 60mm.

The rigid air barrier will also require a junction for the details of this please refer to the rigid

air barrier’s manufacturer.

INTER-STOREY CAVITY JUNCTIONS

DIAGRAM

WITHIN-BOARD JOINS

USE

Use a within-board join to join two shorter weatherboards together.

L IMITATIONS

A maximum of one within-board join is permitted in any length of weatherboard.

A within-board join should not be placed where it is in a board that is directly adjacent to a

junction, corner or penetration.

The two weatherboards either side (in both directions) of the joined board should be

continuous (i.e. have no joins in them) for the entire height of the section/panel.

WITHIN-BOARD JOINS (CONTINUED)

METHOD

Weatherboards may be joined by scarfing two boards together over a dwang. Use an

appropriate adhesive to bond the boards together and nail through the top board only. The

nail should be 30mm from the edge of the join to avoid hitting the underlapping board. Care

should be taken to select and use two boards that have equal moisture contents; otherwise

one board may shrink or expand at a differing rate putting stress on the joint.

DIAGRAM

EXTERNAL 90° CORNER DETAILS

BOXED CORNER

METHOD

Use two cover boards to box the corner. These cover boards must cover a minimum of 50mm

of the weatherboards.

It is recommended to seal the cover boards to the weatherboards by running a bead of

modified silicone or co-polymer construction sealant down the entire length of the boxed

corner.

NOTES

1. All vertical joints between Rigid Air Barrier boards should have an expansion gap. The

size of this gap varies by product; Fibre Cement Boards generally require 1-2mm and

Plywood sheets generally require 2-3mm. Please check with the RAB board

manufacturer for their exact specifications.

An appropriate sealing tape, minimum 75mm wide, must also be applied over the joint

to seal it. Please check with the RAB board manufacturer for the correct type of sealing

tape to use and for correct application method.

2. Corner flashings are to be: minimum 50 x 50mm for Low to Very-high Wind zones;

or minimum 75 x 75mm for Extra-high wind zones.

EXTERNAL 90° CORNER DETAILS (CONTINUED)

BOXED CORNER

DIAGRAM


EXTERNAL CORNER MOULD FLASHING

METHOD

Trim the weatherboards and butt up to an ‘External Corner Mould Flashing’.

Seal the edge of the weatherboards to the flashing with a bead of modified silicone or co-

polymer construction sealant down the entire height of the corner.

NOTES








2. Corner flashings are to be: minimum 72 x 72mm for Low to Very-high Wind zones;

or minimum 97 x 97mm for Extra-high wind zones.


EXTERNAL CORNER MOULD FLASHING

DIAGRAM


NOTCHED AND LAPPED

METHOD

Trim the weatherboards and notch them to join as drawn. Fit a 50 x 50mm External Corner

Flashing behind the corner (over the cavity battens).

Seal the weatherboards to each other with a bead of modified silicone or co-polymer

construction sealant down the entire height of the corner.

IMPORTANT

This corner is not suitable for extra-high wind zones.

Also, as there is an increased risk of failure due to this type of corner, regular inspections and

prompt maintenance are essential.

NOTES









NOTCHED AND LAPPED

DIAGRAM


P40 CORNER MOULD

METHOD

Trim the weatherboards and butt them up to a P40 Corner Mould as shown. Fit a 50 x 50mm

External Corner Flashing behind the corner (over the cavity battens).

Seal the weatherboards to the corner mould with a bead of modified silicone or co-polymer

construction sealant down the entire height of the corner. Nail the corner mould into the edge

of the weatherboards, predrill all holes to minimize splitting.

IMPORTANT




NOTES









P40 CORNER MOULD

DIAGRAM

EXTERNAL 135° CORNER DETAILS

MITRED CORNER

METHOD

Trim and mitre the weatherboards to create a tight mitred joint. Set the joint with a suitable 2-

pot epoxy sealant. Fit a 50 x 50mm External 135° Corner Flashing behind the corner (over the

cavity battens).

IMPORTANT




NOTES









MITRED CORNER

DIAGRAM

INTERNAL 90° CORNER DETAILS

INTERNAL MOULDING

METHOD

Trim the shiplap details off the Weatherboards butt them up to a 40 x 40mm D4S Moulding.

Fit a 90 x 90mm Internal Corner Flashing behind the corner (over the cavity battens).

Seal the weatherboards to the moulding with a bead of modified silicone or co-polymer

construction sealant down the entire height of the corner.

NOTES








INTERNAL 90° CORNER DETAILS (CONTINUED)

INTERNAL MOULDING (CONTINUED)

DIAGRAM


BUTTED

METHOD

Trim the weatherboards and butt up to each other as shown. Fit an Internal Corner Flashing

behind the corner (over the cavity battens).

Seal the edge of the weatherboards to each other with a bead of modified silicone or co-


NOTES








2. For Low to Very-high wind zones use a 50 x 50mm corner flashing and ensure nails are

40mm from the corner to avoid penetrating the flashing.

For Extra-high wind zones use a 75 x 75mm corner flashing and ensure nails are 65mm

from the corner.


BUTTED (CONTINUED)

DIAGRAM


‘W’ FLASHING

METHOD

Trim the weatherboards and butt them up to a ‘W’ Flashing as shown.

Seal the edge of the weatherboards to the flashing with a bead of modified silicone or co-


NOTES








For Low to Very-high wind zones use a 71 x 71mm corner flashing and ensure nails are 60mm

from the corner to avoid penetrating the flashing.

For Extra-high wind zones use a 96 x 96mm corner flashing and ensure nails are 85mm from

the corner.


‘W’ FLASHING (CONTINUED)

DIAGRAM

INTERNAL 135° CORNER DETAILS

MITRED CORNER

METHOD

Trim and mitre the weatherboards to create a tight mitred joint. Set the joint with a suitable 2-

pot epoxy sealant. Fit a 50 x 50mm Internal 135° Corner Flashing behind the corner (over the

cavity battens).

IMPORTANT




NOTES









MITRED CORNER (CONTINUED)

DIAGRAM

BOTTOM PLATE (BASE OF WALL) DETAILS

METHOD

Position a cavity closure to end close the cavity 10mm below the bottom plate, apply flashing

tape to the rigid air barrier to overlap into the cavity closure.

Please consult the rigid air barrier manufacture for specification for how much the rigid air

barrier should overhang the bottom plate. Generally a fibre cement board will require a 15mm

overhang and plywood will require a 25mm overhang, but this will vary by product and

manufacturer.

Extend the weatherboards down past the bottom plate by 50mm, ensuring that there is a

minimum 100 from weatherboards to finished ground height (for paved ground) or 175mm

(for unpaved ground).

Ground to be sloped (minimum 1:30) to carry water away from building.

BOTTOM PLATE (BASE OF WALL) DETAILS (CONTINUED)

CONCRETE SLAB-ON-GROUND

DIAGRAM

BOTTOM PLATE (BASE OF WALL) DETAILS (CONTINUED)

TIMBER FLOOR

DIAGRAM

DECK DETAILS

JUNCTION WITH BOTTOM OF CLADDING

REQUIREMENTS

Careful forward planning is required to ensure that a deck will meet all Building Code

requirements.

Where Cladding finishes above a deck it must be a minimum 35mm from the finished decking

surface and have a 10mm drip edge. Note: If using duck boards then the finished deck surface

is defined as the top of the duck boards, not the decking surface/membrane they sit upon.

Where a slatted deck finishes next to cladding (for both cantilevered and non-cantilevered),

there must be a minimum 12mm gap between the wall surface and the deck slats.

Please refer to E2/AS1 for requirements specific to the type of deck used (such as surface

slope/fall, maximum area, membrane requirements, vertical distance from internal flooring

height to finished deck surface, etc).

DECK DETAILS (CONTINUED)

JUNCTION WITH BOTTOM OF CLADDING (CONTINUED)

DIAGRAM (DECK FINISHING ADJACENT TO CLADDING)

TOP PLATE (TOP OF WALL) DETAILS

FLAT SOFFIT

METHOD

Run a cavity batten horizontally along the top of the wall to seal the top of the cavity and to

prevent moisture/vapour transfer from the wall cavity into the roof/soffit cavity.

Fit an Eaves Mould tight up against the soffit lining and seal with a bead of modified silicone or

co-polymer construction sealant.

DIAGRAM

TOP PLATE (TOP OF WALL) DETAILS (CONTINUED)

ANGLED SOFFIT

METHOD


prevent moisture/vapour transfer from the wall cavity into the roof cavity.

The rigid air barrier should continue up the wall as high as possible.

Fit an Eaves Mould tight up against the soffit lining and seal with a bead of modified silicone or

co-polymer construction sealant.


ANGLED SOFFIT (CONTINUED)

DIAGRAM

TOP PLATE (TOP OF WALL) DETAILS

NO SOFFIT

METHOD


prevent moisture/vapour transfer from the wall cavity into the roof cavity.

The rigid air barrier should continue up the wall as high as possible.

A fascia board is highly recommended to portect against wind-driven rain. In all situations the

builder must determine if plugs are needed to seal the negative detail between Weatherboards.

When protruding corners (such as Boxed or P40) are used: Use a packer to provide a flush

surface to mount the fascia onto so that fascia is flush with protruded corners.

When flush corners (such as External Corner Mould Flashing, Notched and Lapped) are

used: Fascia may be mounted directly on the weatherboards.

Important: Make sure sufficient support is provided to mount the spouting bracket to.

Roofing must over hang the fascia by minimum of 50mm.

An eaves flashing may be required in certain situations (for example in high, very-high and

extra-high wind zones as well as other high-risk situations), the roofer is to determine if

necessary and install.


NO SOFFIT (CONTINUED)

DIAGRAM

PARAPET/ENCLOSED BALUSTRADE DETAILS

CAPPING

METHOD

Parapets are to be capped with a metal flashing that meets all of the following criteria:

Capping is to have 50 year durability; and

No penetrations through the top of capping (fix through the side); and

Slope of top is to be minimum 5° (1:12); and

Capping is to be separated from timber by the use of roofing underlay or another

suitable material; and

Capping must overlap the weatherboards by:

o 50mm for Low to High wind zones;

o 70mm for Very-high wind zones; or

o 90mm for Extra-high wind zone.

Capping is to have a ‘birds beak’ style drip edge.

Note: Enclosed balustrades must also comply with all the above criteria, except that cappings for enclosed balustrades only

require 15 year durability (this is because they are easier to inspect).

Use a sloped packer continuously along the top of the parapet/enclosed balustrade to support

the capping flashing.

FLASHING SIZES

Flashings should be custom made and sized to measurements taken on-site to ensure a

perfect fit.

EXPANSION JOINTS

Metal cappings longer than 8 metres may require an expansion gap. Refer to E2/AS1 for

details.

PARAPET/ENCLOSED BALUSTRADE DETAILS (CONTINUED)

CAPPING (CONTINUED)

DIAGRAM


INTERSECTION WITH WALL

DIAGRAM


INSTALLATION

STEP-BY-STEP

1: Ensure that adequate framing is in

place on the main wall.

2: Fix rigid air barrier to main wall.

3: Frame the balustrade/parapet.

4: Fix rigid air barrier to

balustrade/parapet, remember to leave

expansion gap at ends of sheet (do not

butt RAB sheet hard into main wall).

5: Run flashing tape over the top of

balustrade/parapet and continue down

each side of the rigid air barrier by

50mm.


INSTALLATION (CONTINUED)

STEP-BY-STEP

6: Run flashing tape down the corners

ensuring at least 50mm overlap to each

RAB board.

7: Apply cavity battens to

balustrade/parapet. Remember that

cavity battens are to stop short 40mm to

form drain.

8: Fit a sloped packer to making sure it

extends all the way into the cavity of the

wall.

9: Apply flexible flashing tape to seal

sloped packer to rigid air barrier against

main wall. This tape is to drain any

moisture in the cavity above into adjacent

cavities.

10: Apply cavity battens to wall.

Remember that cavity battens are to stop

short 40mm to form drain.



STEP-BY-STEP

11: Fit corner flashings to internal

corners.

12: Trim and fit weatherboards into the

corner on the balustrade/parapet.

13: Fix weatherboards to

balustrade/parapet.

14: Install an isolating layer of roofing

wrap between timber and metal capping.

15: Install saddle flashing.



STEP-BY-STEP

16: Apply two lines of sealant to saddle

flashing in preparation for installing

capping flashing.

17: Install capping, seal to saddle

flashing by riveting and using two lines

of sealant.

18: Starting fixing weatherboards to main

wall.

19: Scribe weatherboards to fit over and

around saddle flashing.

20: Install rest of weatherboards.

PIPE PENETRATION DETAILS

METHOD

Cut a hole 6-10mm larger in diameter through internal lining, rigid air barrier, and

weatherboard (so that there is 3-5mm between pipe and internal lining/weatherboard) and

apply a suitable sealant over PEF rod to make weathertight.

Pipe to be on 5° slope downward, so that any water in the cavity will run away from the rigid

air barrier (towards the weatherboard).

Rest a bevelled packer on a nogging under the pipe to support it, and secure the pipe to the

packer with a strap/webbing fastened with screws.

Use an appropriate pipe flashing that has been approved by Timspec (such as Marshall

Waterproofing’s Trade Seal) to seal the pipe to the rigid air barrier. Install the pipe flashing as

instructed by the manufacturer. Alternatively use flashing tape as described in E2/AS1 to seal

the pipe to the rigid air barrier.

PIPE PENETRATION DETAILS (CONTINUED)

DIAGRAM

METER BOX

CAUTION

Meter box penetrations have a higher risk of water ingress, and as such all possible steps

should be taken to minimise this risk.

Flush mounted meter boxes (that do penetrate the building envelope) should be located in

sheltered areas such as porches or carports. It is preferable that they come with a specifically

designed flange kit or flashing kit.

Surface mounted meter boxes (that do not penetrate the building envelope) are preferable

from a weathertightness perspective but an electrician should also be consulted before

determining their suitability.

METHOD

Run flashing tape around the entire opening and ensure that it overlaps the Rigid Air Barrier by

50mm. An additional application of flashing tape is required over the ‘Z’ flashing above the

meter box head. The ‘Z’ flashing is to be riveted and sealed to the meter box head flashing

with minimum 10mm cover. The head flashing must also be riveted and sealed to the meter

box.

It is important to install a flexible air seal to all sides of the meter box. This must be a self-

expanding polyurethane foam or sealant installed over a closed cell polyethylene foam (PEF) or

a similar backing rod.

METER BOX (CONTINUED)

HEAD

DIAGRAM


JAMB

DIAGRAM


SILL

DIAGRAM

ALUMINIUM JOINERY

GENERAL DETAILS

IMPORTANT: CONSULT WITH YOUR JOINERY MANUFACTURER F IRST!

The method outlined below is just one way of meeting Building Code Requirements. You

should consult with your Joinery manufacturer before starting installation as you may need to

follow their recommendations where their Joinery is a different profile; has different details; or

has any special requirements.

It is advisable to use sill trays (in addition to sill support bars) but this may not be practical

with some joinery systems.

METHOD

Run flashing tape around the entire opening and ensure that it overlaps the rigid air barrier by

50mm. An additional application of flashing tape is required over the cavity close above the

joinery head.

Joinery is to be installed as per the diagrams on the following pages taking care to ensure that

all flashings provide sufficient protection.

It is important to install a flexible air seal to all sides of the Joinery penetration. This must be

a self-expanding polyurethane foam or sealant installed over a closed cell polyethylene foam

(PEF) or similar backing rod.

ALUMINIUM JOINERY (CONTINUED)

HEAD

DIAGRAM


JAMB

DIAGRAM


SILL

DIAGRAM

WOODEN JOINERY (CONTINUED)

GENERAL DETAILS

IMPORTANT: CONSULT WITH YOUR JOINERY MANUFACTURER F IRST!

The method outlined below is just one way of meeting Building Code Requirements. You

should consult with your Joinery manufacturer before starting installation as you may need to

follow their recommendations where their Joinery is a different profile; has different details; or

has any special requirements.

One example of special requirements that may require extra detail from the Joiner is openings

that require fixing through the sill. Modifications would need to be made to either: allow for a

sill flashing that stops part way up the sloped packer so that fixings that do not penetrate the

sill flashing; or another method as outlined by the joiner.

METHOD

Run flashing tape around the entire opening and ensure that it overlaps the Rigid Air Barrier by

50mm. An additional application of flashing tape is required over the cavity close above the

joinery head as well as over the sloped sill packer below the joinery sill.

Joinery is to be installed as per the diagrams on the following pages taking care to ensure that

all flashings provide sufficient protection.

It is important to install an air seal to all sides of the Joinery penetration.

For the jambs and head this must be a self-expanding polyurethane foam or sealant installed

over a closed cell polyethylene foam (PEF) or similar backing rod. For the sill a continuous

packer can act as an air seal.


HEAD

DIAGRAM


JAMB

DIAGRAM


SILL

DIAGRAM

SITE CLEAN-UP

After completion the installer is to leave the site in a clean and tidy manner, including:

1. Replacing or repairing any damaged or marked items; and

2. Removing all rubbish, debris and unused items from the building site.

Any treated and/or coated timber off-cuts or rubbish are to be disposed with according to

local council requirements.

Note: Accoya ® wood is not treated with dangerous chemicals and can be disposed by burning, or as untreated timber at refuse

sites.

ON-GOING MAINTENANCE

It is the building owner’s responsibility to ensure that the cladding system receives regular

maintenance so that it continues to perform at its required level.

MAINTENANCE INTERVAL

For most areas (especially coastal, industrial, and inner-city area) maintenance should be

performed at least once every 12 months. Maintenance may be required as often as once

every six months, depending on the level of pollution, dirt and dust in the environment.

For sheltered, inland locations, maintenance should be performed once every 12 to 18 months.

MAINTENANCE REQUIREMENTS

Regular maintenance is to include the following 5 steps:

1. Wash all exterior surfaces with low pressure water to remove dust, dirt and other

contaminants;

a. Extra attention should be given to areas that are not exposed to rain such as

sheltered areas below eaves;

b. Do not direct high pressure water at any part of the cladding system, especially

sensitive junctions such as joinery surrounds and other flashings were you must

avoid forcing water past anti-capillary gaps and flashings into the wall cavity.

2. Use a soft bristle brush or broom with water and an appropriate cleaning agent (refer to

paint manufacturer for correct cleaning agent specific to their paint system) to remove

stubborn or persistent dirt and contaminants.

ON-GOING MAINTENANCE (CONTINUED)

MAINTENANCE REQUIREMENTS (CONTINUED)

3. Inspect all surfaces and junctions for signs of damage, wear-and-tear, or coating

breakdown. Where coating surface has broken or remedial action is required:

a. Remove all damaged or loose coating (may involve sanding back to solid timber);

b. Spot prime any bare timber (if repairing paint);

c. Recoat with minimum two coats of the product originally used to initially overcoat

the timber.

4. Repairing or replacing any damaged or deteriorated items in order to preserve the

weathertightness of the building:

a. Small isolated areas of dry rot in timber can be cut out and filled then primed and

coated;

b. For larger areas of deterioration: remove and replace either the damaged section

or the entire board for any deteriorated timber boards either (includes scribers,

cover boards and weatherboards). Prime and coat the replacements as required;

c. Other items (soakers, flashings and cappings) may need to be replaced in their

entirety.

5. Where a coating is applied, periodic recoating is required to ensure the integrity of the

coating is sustained. This will generally mean applying another exterior coat every 4 to

10 years (dependant on the coating used and building location) after washing and

maintenance.

IMPORTANT POINTS

While every effort should be made to familiarise ones self with the entire contents of this

specification means to reiterate a few important points.

Nail on an upwards angle: All Weatherboard nails should be on a 5° upward slope so that water

cannot run down the nail through the cavity.

Weatherboard nails must never penetrate a flashing! Flashings provide a secondary line of

defence at critical points, by nailing through the flashing you provide a clear path for water to

track along.

Predrill Accoya: Accoya wood will require predrilling for pilot holes before nailing as it is drier

and therefore more prone to splitting.

Check what treatment your H3.2 Pine is: ACQ and CuAz treatments are more corrosive than

CCA and should not be used in contact with galvanised metals. This means that ACQ or CuAz

need stainless steel nails. Also, regardless of the treatment H3.2 timber should not be used

where it contacts galvanised flashings (use aluminium, stainless steel or uPVC).

Plan ahead: Work out your Weatherboard spacings before you start nailing boards up. Corners

will require extra planning to ensure that you don’t end up with a board too narrow to fix. You

may need to trim down a board to make it narrower and place in the 2 or 3 boards out from

the corner to ensure that you have a full board finishing at the corner.

Cavity Battens must direct water outwards: Ensure the sloped top edge of cavity battens directs

water outwards (away from the framing).

Trim one side of battens only: When trimming cavity battens (often required at joinery heads to

allow for flashing tape and cavity base closure) make sure you only trim off the side that will

be going against the framing. The 20 x 7mm cut-outs need to be full-sized on the side facing

outwards (against weatherboards) to allow for drainage.

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