gib bracing

GIB Bracing Systems

www.gib.co.nz

CBI 5113

March 2006

GIB Bracing Systems, March 2006Winstone Wallboards Ltd accepts no liability if GIB Bracing Systems are not used in accordance with instructions contained in this publication.

Use Only the Current SpecificationThis publication may be superseded by a new publication. Winstone Wallboards Ltd accepts no liability for reliance upon publications that have been superseded. Before using this publication check whether this is the current publication, simply call the GIB Helpline on 0800 100 442 or visit www.gib.co.nz

SubstitutionGIB Bracing Systems are not generic. Where specified, GIB branded components must be used when specifying and installing GIB Bracing Systems. Substitution is not in accordance with the instructions contained in this publication.

CopyrightCopyright Winstone Wallboards Ltd 2006. All of the material contained in this brochure, including all text, tables, charts, graphs, drawings, fastener patterns, diagrams and the EzyBrace Specification Numbering System (and the sub-components thereof), are protected by copyright. These materials may not be reproduced, adapted or transmitted in any form by any process, without the permission of Winstone Wallboards Ltd.Winstone Wallboards also reserves all other intellectual property rights in the materials contained in this brochure.

AcknowledgementsWIND and EARTHQUAKE design Tables and Figures were reproduced from NZS 3604:1999 with kind permission from Standards New Zealand (SNZ).The copyright remains the property of SNZ. Your attention is drawn to the copyright infringement notice contained in NZS 3604:1999.Assistance was provided by BRANZ with the design of the procedure for determination of the WIND ZONE.

BRANZ Appraisal CertificateNo. 294 (2006)

GIB Bracing Systems, 2006

PageGIB Bracing System Changes .................................................................................................................................................................................................................. 3Introduction ................................................................................................................................................................................................................................................................................ 4Scope of UseCompliance with the New Zealand Building Code (NZBC)AppraisalLimitationsGIB Bracing Systems in Water-Splash AreasRenovationHow to use this Document

DESIGNDesign Step 1 Wind 5-8The Wind ZoneWind RegionTerrainSite ExposureTopographic ClassificationWorking out the Bracing Units (BUs) Required for Wind

Design Step 2 Earthquake ........................................................................................................................................................................................................................... 9The Earthquake ZoneWorking out the Bracing Units (BUs) Required for EarthquakeRoof Space Areas

Design Step 3 Distribution of Wall Bracing Elements 10Design Steps 4 and 5 Bracing Units Achieved (Wind & Earthquake) ................................................................................ 1213Wall Heights other than 2.4mGIB Bracing Systems EzyBrace Specification Numbering SystemPanel Hold-downsBracing Units (BUs) achieved Wind and Earthquake

Wall Bracing Calculation Sheets ............................................................................................................................................................................................................ 1415BRACING DEMAND TABLES WIND ............................................................................................................................................................................................... 16Tables W1a, W1b

BRACING DEMAND TABLES EARTHQUAKE ............................................................................................................................................................... 1722Tables EQ1, EQ2, EQ3, EQ4, EQ5, EQ6

CEILING DIAPHRAGMS .......................................................................................................................................................................................................................................... 24-25Ceiling DiaphragmsCeiling Diaphragms Steel BattensCONSTRUCTION DETAILS .................................................................................................................................................................................................................................. 26-28GIB Bracing System Changes FramingFastening GIB Plasterboard LiningsPlywoodFire Resistance and Noise RatingsJointing and StoppingFastening the Bracing Element to Timber FloorsFastening the Bracing Element to Concrete SlabsPanel Hold-Down DetailsOpenings in Bracing ElementsGIB Bracing Systems in Water-Splash AreasRenovationAngle BracesTop Plate ConnectionsGuidelines for Intersecting WallsFixing the Perimeter of a Bracing ElementFixing in the Field of the Bracing ElementHorizontal FixingGIB Bracing Systems EzyBrace Specification Numbering System

Panel Hold-Down Details (illustrations) ............................................................................................................................................................................................... 29Fastener Layouts GIB Standard Bracing Elements (illustrations) ................................................................................................ 30Fastener Layouts GIB Braceline Bracing Elements (illustrations) ............................................................................................... 31GIB Bracing Systems Installation Checklist ................................................................................................................................................................... 32GI

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GIB BRACING SYSTEMS

Table of Contents MARCH 2006

GIB Bracing Systems ChangesGIB Bracing Systems have undergone a thorough review as part of Winstone Wallboards ongoing programme to make GIB systems simpler, easier and faster for customers to use. Users of the previous systems will notice some significant changes. Please review this technical literature in detail to make yourself aware of these changes.

The key differences are as follows: The new EzyBrace Specification Numbering System is designed to make specification, installation and identification of

GIB Bracing Systems easier. A rationalised number of bracing element types and a more consistent construction method. Fasteners must not be placed closer than 18mm to a sheet end or a cut edge or no closer than 12mm to the tapered (paper

bound) machine edge of the GIB plasterboard sheets. Some hold down details and corner fastening details have changed. A new 35mm GIB Braceline Nail replaces the 32mm GIB Braceline Nail in GIB Braceline bracing elements. GIB plasterboard sheets used in GIB Bracing Systems March 2006 must have a manufacturing date after 16 January 2006. No additional framing is required for narrow panels. Introduction of a shorter 0.4m bracing element. Ability to substitute GIB Aqualine for GIB Braceline with modified fastener patterns.

Note: The bracing systems in the GIB Bracing Systems 1999-2003 technical literature will remain valid, however, transfer to the systems contained in this publication is recommended for new designs for the benefits these systems offer.

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GIB BRACING SYSTEMS

Changes to GIB Bracing Systems MARCH 2006

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GIB BRACING SYSTEMS

Introduction MARCH 2006

Scope of UseThis document is a guide to wall bracing of buildings constructed in accordance with NZS 3604:1999, Standard for Timber Framed Buildings not requiring specific design.It is for owners, architects, engineers, draftsmen and builders, and designed to help the user to determine a buildings wall bracing needs. It explains how to use GIB Bracing Systems to resist wind and earthquake forces. The information contained in this document is believed to be correct and accurate. However, all due care should be exercised by those who use it. If necessary, appropriate advice should be sought. Winstone Wallboards Ltd accepts no liability if the system is not used in accordance with instructions contained in this literature.

Compliance with the New Zealand Building Code (NZBC)GIB Bracing Systems comply with the requirements of NZS 3604:1999, when designed and installed in accordance with this brochure. NZS 3604:1999 is an Acceptable Solution to NZBC Clause B1 Structure.Under normal conditions of dry internal use GIB Bracing Systems have a service life in excess of 50 years and satisfy the requirements of NZBC Clause B2 Durability.

AppraisalThe document entitled GIB Bracing Systems has been appraised by BRANZ Ltd. BRANZ Appraisal Certificate No. 294 (2006).

LimitationsGIB plasterboard must be stacked flat and protected from the weather.GIB plasterboard must be handled as a finishing material.GIB plasterboard in use must not be exposed to liquid water or be installed in situations where extended exposures to humidities above 90% RH can reasonably be expected.GIB Bracing Systems must not be used in showers or shower over bath situations.It is highly recommended not to install GIB plasterboard in any situation where external claddings are not in place or the property is not adequately protected from the elements. If GIB plasterboard is installed under these conditions, the risk of surface defects such as peaking or cracking is greatly increased.

GIB Bracing Systems in Water-Splash AreasWhen GIB plasterboard is installed in locations likely to be frequently exposed to liquid water it must have an impervious finish. Examples are adhesive fixed acrylic shower linings over GIB Aqualine with an approved waterproof membrane as a substrate for ceramic tiles. The NZBC requires 15 years durability in these situations. Bracing elements are required to have a durability of 50 years. Winstone Wallboards recommends that bracing elements are not located in shower cubicles or behind baths because of durability requirements, the likelihood of renovation, and practical issues associated with fixing bracing elements to perimeter framing members.Otherwise GIB Bracing Systems can be used in water-splash areas as defined by NZBC Clause E3, provided these are maintained impervious for the life of the building.

RenovationWhen relining walls during the process of renovation, ensure that bracing elements are reinstated (check the building plans).

How to use this DocumentThis document will guide you through the process of designing a bracing system and filling out a bracing schedule in accordance with NZS 3604:1999 step by step. Where reference is made to the GIB Site Guide, use the latest version.

External forces (Bracing Units (BUs) required or demand)Step 1: Work out the required number of BUs for wind

Step 2: Work out the required number of BUs for earthquake

Step 3: Ensure adequate distribution of wall bracing elements

Step 4: Work out the achieved number of BUs for wind

Step 5: Work out the achieved number of BUs for earthquake

The structures resistance (Bracing Units (BUs) achieved or capacity)

No bracing in the shaded areas

Warkworth Snells Beach

R2

R1

Auckland Thames

R2

MorrinsvilleR1

New Plymouth

OhakuneWaiouru

Turangi

R1

R2

WellingtonBlenheim

R1

R1R1

R2

Lee zone

Hanmer Springs Kaikoura

Culverden

Christchurch

Methven

Twizel

Haast

R2

Cromwell

Alexandra

Dunedin

R2

Waikanae

Pinehaven

Lake Ferry

Manor Park

Paraparaumu

The Wind ZoneDetermining the wind zone for a particular building site can be a complicated step in preparing a bracing schedule. Some territorial authorities already have wind zoning maps prepared to assist designers. Ring your local building office to find out. If the information is not available, the wind zone can be worked out by following the simple procedure below.The wind forces that act on a building depend on the wind region, the terrain roughness, the site exposure, and the topography.By considering these four variables individually and assigning points, based on severity of wind loading, the total number of points scored will determine the site wind zone;

POINTS WIND ZONE

0 Low (L)1 Medium (M)2 High (H)3 Very High (VH)4 or more Specific Design (SD)

Wind Zone Variable 1:Wind Region (R1/R2)New Zealand is divided into wind regions as illustrated in Figure W1.

i The majority of the country is classified R1.ii Strong winds commonly occur in the extreme regions of

both islands and these regions are classified R2.

Determine the wind region from Figure W1 and assign points as follows:R1 = 0, R2 = 1

Wind Regions Fig W1

Note: Shaded areas in Fig W1 must have a topographic classification of at least moderate.

Wind Region

Terrain Roughness

Site Exposure

Topographic Classification

Wind Zone

+

+

+

=

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GIB BRACING SYSTEMS DESIGN

Design Step 1 Wind MARCH 2006

Exposed

Sheltered

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Design Step 1 Wind cont. MARCH 2006

Wind Zone Variable 2: Terrain (Inland/Coastal)The roughness of the terrain over which the wind must pass before it reaches the building site slows down the wind speed.

i The site is classified as coastal terrain if within 500m of the sea coast, open water, or the edge of coastal mudflats, flat beaches, airfields, etc.

Note: Open water includes lakes, rivers and inland waterways wider than 300m.

ii Sites not within the coastal terrain are classified as inland.

Determine the terrain category and assign points as follows: Inland = 0, Coastal = 1

Wind Zone Variable 3: Site Exposure (Sheltered/Exposed)Nearby obstructions will provide shelter to a proposed building from wind coming over open parks, motorways, rivers, or other open spaces greater than 100m wide.

i At least two rows of similarly sized, permanent obstructions in each upwind direction are required for the site to be considered sheltered.

ii If the proposed building does not receive such shelter from nearby obstructions then it should be classified as exposed (e.g., a clear unobstructed view from the ground floor level over neighbouring buildings).

Note: In situations such as growing sub-divisions, the site exposure may be based on the expected conditions five years hence.

Determine the site exposure and assign points as follows: Sheltered = 0, Exposed = 1

Wind Zone Variable 4: Topographic Classification (Gentle/Moderate/Extreme)The topography of the land will affect the wind flow, e.g., hill top sites will receive higher wind loadings than sites on the flat.

i Sites with a gentle classification are; Sites on flat land or undulating hills less than 20 metres

high, Sites on the lower slopes of hills which have a slope

flatter than 1:5. The gentle classification covers the majority of building

sites in New Zealand.

ii Sites with a moderate classification are; Sites more than 20 metres above a valley floor, Sites within 150 metres of the crest of a hill, ridge or

spur which has a slope flatter than 1:5, Sites on the crest of an escarpment.

iii Sites with an extreme classification are; Sites within 250 metres of the crest of a hill, ridge or spur

which has a slope steeper than 1:5, Sites at the head of a valley.Note: Some small pockets where there is known evidence of strong winds as a result of specific local land formations are identified on Figure W1. These must be classified at least moderate.

Determine the site topography and assign points as follows: Gentle = 0, Moderate =1, Extreme = 3

Notes to assist with the determination of the topographic classification:Establishing heights is easiest from contour maps of your local area. Your councils building office may be able to assist.To determine the topography, select the landform that best fits your building site. Cross sections should be taken so that they represent the worst case (i.e., steepest slope). Remember that it is impossible to capture NZs topography in a few simple sketches. Your judgement is sometimes required. If in doubt, talk to your local councils building office.On hill slopes steeper than 1:5, roads and driveways will tend to follow the contour. On flatter slopes they tend to take the shortest route up the hill.20 metres is approximately 3 times the height of a two storey house.

Coastal500m

Inland

150mor less

Hillside, steeper than 1 in 5 Ridge or spur, flatter than 1 in 5

Escarpment Valley floor

Undulating hills Hillside, flatter than 1 in 5

Ridge or hilltop, steeper than 1 in 5 Head of Valley

Gentle

20m

Gentle

20m

20m 20m

Moderate ExtremeGentle Moderate

Hig

hest

poi

nt

150mor less

Gentle ModerateH

ighe

st p

oint

150mor less

Gentle

Gentle Moderate Gentle Moderate

150mor less

250mor less

Gentle

Moderate Extreme

250mor less

250mor less

Moderate

Hig

hest

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Moderate

Spur beyond

Extreme

250m

Valley

Hig

hest

poi

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Topographic classification

Across

BW roo

f over 2

5O

BW

Along

BL roof over 25 OBL

Roof

ApexStud height

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Working Out the Bracing Units (BUs) Required for WindWhen the wind zone has been established you can work out the total number of BUs required to brace the structure against wind loads. You need to consider bracing in two directions, along and across the building.Table W1a (page 16) lists the BUs needed for wind and applies to a single storey building, or the top storey of a two storey building.Table W1b (page 16) lists the BUs required for a lower storey of a two storey building.Both tables list the number of BUs required per metre of building length or width. Normally the buildings length and width can be taken off the building plans at floor level. However, when the roof pitch is greater than 25 degrees the buildings length and width are taken at eaves level, i.e., the floor plan dimensions plus any eaves overhang. This is because such steep roofs become the dominant target for wind.

From the tables,

i Select the overall height of the building (height to apex)ii determine the roof height above the eavesiii determine the stud height (2.4 or 3.0m)iv select the appropriate wind zone columni, ii and iii will give you a horizontal row on the table. iv will narrow the answer down to two readings:

for calculating BUs across

for calculating BUs along

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Design Step 2 Earthquake MARCH 2006

The Earthquake ZoneThe potential earthquake loading on structures is more severe in some areas of New Zealand than it is in others. Figure EQ1 divides the country in three earthquake zones, A, B and C.Look at the map to determine your earthquake zone.Select earthquake zone A/B/C.

Working Out the Bracing Units (BUs) Required for EarthquakeWhen you have found your earthquake zone use Tables EQ1-6 (pages 17-22) to determine the number of BUs required to brace the building against earthquake loads.The weight of building materials is important. This is reflected in tables EQ1-6. Heavy claddings and roofs mean more BUs required.

i The first three columns have combinations of subfloor, wall and roof cladding weights. Select the category that best fits the building.

ii Select the roof slope from the 4th column.iii Select the earthquake zone.You will now be able to read the number of BUs required.This number represents the BU requirement per square metre. Work out the number of BUs needed by multiplying this number per square metre by the building plan area measured at floor level.In an earthquake the ground motion can be in any direction so it is the same buildings weight which gets rocked around. The BU requirements for earthquake are therefore the same in both the along and across directions.

Roof Space Areas Up to 50% of the roof space area may be developed into

attic rooms. If this is the case, then the BU requirements per m2 of floor area measured at ground level (as derived from table EQ1 EQ6) must be increased by 3 BUs per m2.

If more than 50% is developed, then the roof space must be considered as an additional storey and the storey below becomes a lower of two.

Hokitika

Auckland

Tauranga

C

New Plymouth

A

Wellington

Christchurch

BB

A

A

C

B

C

CB

A

Thames

Mercer

Miranda

Pokeno

Te PuruWhenuakite

Te KuitiTokoroa

Greymouth

Lake Coleridge

Timaru

WaimateOamaru

MosgielBalclutha

Dunedin

LeithfieldSefton

Governors BayLincolnBurnham

TaitapuDunsandel

Earthquake Regions Fig EQ1

A B C

M

N

O

P

NM

NM

B B

2m m

ax2m

max

5m max

6m max

0.87 x L45O30O

60O

LL

0.7 x L

0.5

x L

0.7

x L

single 100 x 50top plate

150 x 40 plus100 x 50top plate

Across

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Design Step 3 Distribution of Wall Bracing Elements MARCH 2006

When the number of BUs required for wind and earthquake in both the along and across directions have been worked out, the next task is to allocate wall bracing elements on the building plan by using external and internal walls lined with GIB plasterboard. Distribution of bracing is done by drawing an imaginary grid pattern of bracing lines along and across the building. These should be numbered A,B,C, etc. in the along direction and M,N,O etc. in the direction across the building. These bracing lines must coincide as much as possible with the wall bracing elements.

External walls are supported horizontally by bracing lines at right angles. If those supports are spaced too far apart, then the external wall could suffer unacceptable deformation. For this reason the following maximum spacing of bracing lines must be adhered to,

i 5 metres for standard construction or ii 6 metres if a double top plate, as illustrated opposite,

stiffens the external wall

iii 7.5 metres with a GIB Standard plasterboard ceiling diaphragm, or 7.5 metres when dragon ties in accordance with NZS3604:1999 are used

iv 10 metres with a GIB Ultraline ceiling diaphragm v 15 metres with a GIB Braceline ceiling diaphragm

(For ceiling diaphragms see pages 24, 25) Each bracing line must contain a minimum number of

bracing units as follows,

i external walls 10 BUs per metre and at least 100 BUs total when dragon ties or a ceiling diaphragm are attached

ii internal walls 70 BUs total, or 100 BUs when supporting a ceiling diaphragm

Pairs of wall bracing elements can be a maximum of 2 metres either side of a bracing line, and count for the total number of BUs on that line.

Try and achieve an even distribution of bracing throughout. A building which is heavily loaded with bracing at one end and lightly braced at the other, is likely to suffer damage through rotation under severe wind or earthquake loads.

Locate bracing in or near external building corners. If it is not practical to locate bracing in corners due to windows, etc., then it is desirable to make the first lined wall section adjacent to the window a wall bracing element.

Wall bracing elements can be at an angle to a bracing line and contribute in both directions. For 30, 45 and 60 degree angles the rating of the wall length L must be multiplied by reduction factors as follows,

i 30 degrees x 0.87 ii 45 degrees x 0.70 iii 60 degrees x 0.50

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Notes MARCH 2006

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Design Steps 4 and 5 Bracing Units Achieved(Wind and Earthquake) MARCH 2006

The next step is to place selected wall bracing systems on the bracing lines. A range of GIB Bracing Systems have been tested and the specifications and Bracing Unit ratings are listed on the next page. GIB Standard Plasterboard systems often represent the majority of the wall bracing elements. GIB Braceline systems are used for narrow walls or when high Bracing Unit ratings are required.

Wall Heights other than 2.4mThe published Bracing Unit ratings are based on a 2.4 metre height. For other heights, the ratings must be multiplied by a factor f = 2.4 divided by actual wall height. The Bracing Unit ratings for walls higher than 2.4 metres will reduce, and the Bracing Unit rating for lower walls will increase. Factor f must not be greater than 1.3.

For example:The Bracing Unit rating of a 2.7 metre high wall is obtained by multiplying the values in Tables 1 and 2 by f = 2.4/2.7 = 0.89The Bracing Unit rating of a 3.6 metre high wall is obtained by multiplying the values in Tables 1 and 2 by f = 2.4/3.6 = 0.67The Bracing Unit rating of a 2.0 metre high wall is obtained by multiplying the values in Tables 1 and 2 by f = 2.4/2.0 = 1.2The Bracing Unit rating of a 1.5 metre high wall is obtained by multiplying the values in Tables 1 and 2 by f = 2.4/1.5 = 1.6. However, note that f is not permitted to be greater than 1.3, so adopt f = 1.3.

The height of walls with a sloping top plate can be taken as the average height.

GIB Bracing Systems EzyBrace Specification Numbering SystemThe EzyBrace Specification Numbering System is designed to make specification of GIB Bracing Systems by designers and identification on site by builders and building officials more transparent. Note: The EzyBrace Specification Numbering System (and sub-components thereof) are protected by copyright.

GS = GIB Standard PlasterboardBL = GIB Braceline

BLP = GIB Braceline / PlywoodBLG = GIB Braceline / GIB Standard Plasterboard

1 = lined one side2 = lined both sides a = angle brace

Therefore,

GS1a = GIB Standard Plasterboard one side with an angle braceGS2 = GIB Standard Plasterboard both sidesBL1 = GIB Braceline one sideBL1a = GIB Braceline one side with an angle braceBLP = GIB Braceline one side, Plywood on the otherBLG = GIB Braceline one side, GIB Standard Plasterboard on the other

Panel Hold-downsPanel hold-down details are illustrated on page 29. GIB Standard Bracing Systems (GS1a and GS2) do not require hold-downs. All bracing systems incorporating GIB Braceline require a panel hold-down at both ends of the bracing element.

Copyright Winstone Wallboards Ltd 2006. All of the material on this document, including all text, tables, charts, graphs, drawings, fastener patterns, diagrams and the EzyBrace Specification Numbering System (and the sub-components thereof), are protected by copyright.

TABLE 1: Bracing Unit Ratings for 10mm GIB Standard Plasterboard and any other 10mm and 13mm GIB plasterboard.

Notes: 1) Where linings are specified on both faces, each face must be fastened as a bracing element. 2) GIB Aqualine can be used in place of GIB Braceline in bracing elements 900mm or longer, provided the perimeter

of the element is fixed with GIB Braceline nails or screws spaced at 100mm centres generally, using the GIB Braceline corner fixing pattern.

3) A maximum of 150 BU/m is recommended for any bracing system used with NZS 3604:1999 construction. Higher ratings generate loads beyond the capacity of NZS 3604:1999 timber foundation and slab details. If ratings exceed 150 BU/m, hold downs and foundations must be the subject of specific structural engineering design.

TYPE LENGTH (m) LINING REQUIREMENT OTHER REQUIREMENTS BU PER METRE

MINIMUMDIAGONAL

BRACEHOLD-DOWNS WIND EARTHQUAKE

BL1

0.4GIB Braceline one face fixed

horizontal or vertical2

no yes 120 115

0.6 no yes 125 115

BL1a 1.8 GIB Braceline one face fixed

horizontal or vertical2 yes yes 130 115

BLP

0.6GIB Braceline one face fixedhorizontal or vertical, 7mm D-D

plywood on the other1,2no yes

145 135

0.9 145 145

BLG

0.6GIB Braceline one face, 10mmGIB Standard on the other face,

linings fixed horizontal or vertical1,2no yes

145 130

1.2 1503 130

TYPE LENGTH (m) LINING REQUIREMENT OTHER REQUIREMENTS BU PER METRE

MINIMUMDIAGONAL

BRACEWIND EARTHQUAKE

GS1a

1.810mm GIB Standard Plasterboard one face fixed horizontal or vertical yes

65 55

2.4 75 65

GS2

1.2

10mm GIB Standard Plasterboard both sides fixed horizontal or vertical1 no

70 60

1.8 80 70

2.4 90 80

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Design Steps 4 and 5 Bracing Units Achieved(Wind and Earthquake) MARCH 2006

TABLE 2: Bracing Unit Ratings for 10mm GIB Braceline, 10mm GIB Noiseline and 10mm GIB Toughline (fixed with GIB Braceline screws or GIB Braceline nails)

In order for GIB systems to perform as tested, all components must be installed exactly as prescribed. Substituting components produces an entirely different system and may seriously compromise performance. Follow system specifications.


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Job Details box 1

Name

Street and Number

Lot and DP Number

City/Town/DistrictLocation of Storey: single/upper of two/lower of two Floor load: 2kPa/3kPa

Building height to apex m Roof weight light/heavy Cladding weights:Roof height above eaves m Subfloor light/medium/heavy Lower Storey light/medium/heavyStud height m Upper Storey light/medium/heavyAverage roof pitch Room in Roof Space Yes / No Building length BL = m Gross Building

Building width BW = m Plan Area, GPA = m2

Note: When the average roof pitch is over 25 degrees, use the eaves length and width to determine BL and BW.

Wind Zone box 2Region: Terrain: Exposure: Topography:R1 0 Inland 0 Sheltered 0 Gentle 0

R2 1 Coastal 1 Exposed 1 Moderate 1

Extreme 3

Total points

Wind Zone: Low (0) Very high (3)

Medium (1) Specific Design (4)

High (2)

Earthquake Zone box 3From figure EQ1 select Earthquake Zone: A B C

BUs required Wind box 4 From Table W1A/W1BW along = BUs/m

W across = BUs/m

Total wind load,

W ALONG:W along x BW = BUsW ACROSSW across x BL = BUs

BUs required Earthquake box 5From Table EQ1/EQ2/EQ3/EQ4/EQ5/EQ6E = BUs/m2

Note: For a room in the roof space use E + 3

Total earthquake load,

EQ ALONG and EQ ACROSS

E x GPA BUs = BUs

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Wall Bracing Calculation Sheet A MARCH 2006

For a GIB EzyBrace software version visit www.gib.co.nz

Along

Across

* If Wreq/Ereq is 1 or less complete E column onlyIf Wreq/Ereq is 1.2 or more complete W column onlyOtherwise complete both W and E

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Wall Bracing Calculation Sheet B MARCH 2006

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1 2 3 4 5

Line Label MinimumBUs

Required

BracingElement

No.

BracingType

LengthElement

(m)L

A

B

C

D

E

Totals Achieved

From Sheet A Totals RequiredWreq/Ereq = *

WIND

6 W 7 W

RatingBU/m

W

BUsAchieved

(BU/m x L)W

W

W

EARTHQUAKE

6 E 7 E

RatingBU/m

E

BUsAchieved

(BU/m x L)E

E

E

WALL OR BRACING LINE BRACING ELEMENTS PROVIDED

1 2 3 4 5

Line Label MinimumBUs

Required

BracingElement

No.

BracingType

LengthElement

(m)L

M

N

O

P

Q

Totals Achieved

From Sheet A Totals RequiredWreq/Ereq = *

WIND

6 W 7 W

RatingBU/m

W

BUsAchieved

(BU/m x L)W

W

W

EARTHQUAKE

6 E 7 E

RatingBU/m

E

BUsAchieved

(BU/m x L)E

E

E

For a GIB EzyBrace software version visit www.gib.co.nz

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GIB BRACING SYSTEMS BRACING DEMAND TABLES WIND

Single or Upper Storey/Lower Storey of Two MARCH 2006

HEIGHTTO APEX

(m)

ROOF HEIGHT (m) (ABOVE

EAVES)

STUDHEIGHT

(m)

STOREYLOCATION

LOW WIND MEDIUM WIND HIGH WIND VERY HIGH WIND

All 1 2.4

Single storeyor upperof two

18 26 24 34 35 49 44 632 28 33 37 44 54 64 69 813 41 41 54 54 78 78 100 1004 60 48 81 64 117 93 149 1185 93 56 124 74 180 107 229 1376 108 63 144 84 209 122 266 1557 123 71 164 94 238 136 303 1748 138 78 184 104 267 151 340 192

All 1 3.0

Singlestoreyor upperof two

23 30 30 40 44 58 56 742 33 38 43 50 63 73 80 933 45 45 60 60 87 87 111 1114 65 53 87 70 121 102 160 1305 98 60 130 80 189 116 241 1486 113 68 150 90 218 131 278 1677 128 75 170 100 248 145 315 1858 143 83 190 110 276 160 352 204

W1a Single or Upper Storey Minimum number of bracing units per metre of building length for wind on wall and roof elevations

Legend For calculating BUs Across For calculating BUs Along

HEIGHTTO APEX

(m)

ROOF HEIGHT (m) (ABOVE

EAVES)

STUDHEIGHT

(m)

STOREYLOCATION

LOW WIND MEDIUM WIND HIGH WIND VERY HIGH WIND

6 1 2.4 to3.0 Lower

of two

57 65 76 86 110 125 141 1592 52 57 69 76 101 110 128 1413 50 50 66 66 96 96 122 1224 55 42 73 56 105 81 134 104

7 1 2.4 to3.0

Lowerof two

72 80 96 106 139 154 178 1962 67 72 89 96 130 139 165 1783 65 65 86 86 125 125 159 1594 69 57 93 76 134 110 171 1415 87 50 116 66 168 96 215 122

8 1 2.4 to3.0

Lowerof two

87 95 116 126 168 183 215 2332 82 87 109 116 159 168 202 2153 80 80 106 106 154 154 196 1964 84 72 113 96 163 139 208 1785 102 65 136 86 197 125 252 1596 102 57 136 76 197 110 252 141

9 1 2.4 to3.0

Lowerof two

102 110 136 146 197 212 252 2702 97 102 129 136 188 197 239 2523 95 95 126 126 183 183 233 2334 99 87 133 116 192 168 245 2155 117 80 156 106 226 154 289 1966 117 72 156 96 226 139 289 1787 117 65 156 86 226 125 289 159

10 1 2.4 to3.0

Lowerof two

117 125 156 166 226 241 289 3072 112 117 149 156 217 226 276 2893 110 110 146 146 212 212 270 2704 115 102 153 136 221 197 282 2525 132 95 176 126 255 183 326 2336 132 87 176 116 255 168 326 2157 132 80 176 106 255 154 326 1968 132 72 176 96 255 139 326 178

W1b Lower Storey of Two Minimum number of bracing units per metre of building length for wind on wall and roof elevations

GIB

B

RA

CIN

G S

YSTE

MS


GIB BRACING SYSTEMS BRACING DEMAND TABLES EARTHQUAKE

Single Storey/Subfloor (2kPa Floor Loads) MARCH 2006

Table EQ1 Bracing demand for earthquake for various combinations of claddings for single storey buildings on subfloor framing and/or foundation walls

SUBFLOORCLADDING

SINGLESTOREY

CLADDING

ROOFCLADDING

ROOF PITCHDEGREES

SUBFLOOR STRUCTURE SINGLE STOREY WALLS

EARTHQUAKE ZONE

A B C A B C

BRACING DEMAND IN BUs/m2 OF FLOOR AREA

Light Light Light0 - 25

26 - 4546 - 60

9.49.8

10.5

7.17.47.9

4.74.95.3

6.77.18.0

5.05.36.0

3.33.64.0

Medium Light Light0 - 25

26 - 4546 - 60

9.910.311.0

7.47.78.3

5.05.15.5

6.87.38.2

5.15.56.1

3.43.74.1

Heavy Light Light0 - 25

26 - 4546 - 60

11.211.612.3

8.48.79.2

5.65.86.2

7.37.88.7

5.55.96.5

3.73.94.3

Light Light Heavy0 - 25

26 - 4546 - 60

12.113.315.4

9.110.011.6

6.16.67.7

9.811.013.3

7.38.3

10.0

4.95.56.6

Medium Light Heavy0 - 25

26 - 4546 - 60

12.613.815.9

9.510.311.9

6.36.98.0

10.011.313.6

7.58.4

10.2

5.05.66.8

Heavy Light Heavy0 - 25

26 - 4546 - 60

13.915.117.2

10.511.312.9

7.07.58.6

10.611.914.2

7.98.9

10.7

5.35.97.1

Mediumand

HeavyMedium Heavy

0 - 2526 - 4546 - 60

14.315.517.6

10.711.613.2

7.27.78.8

11.212.414.8

8.49.3

11.1

5.66.27.4

Medium Medium Light0 - 25

26 - 4546 - 60

11.612.012.7

8.79.09.5

5.86.06.4

8.08.49.3

6.06.37.0

4.04.24.7

Heavy Medium Light0 - 25

26 - 4546 - 60

12.913.314.0

9.710.010.5

6.56.77.0

8.48.99.8

6.36.77.4

4.24.54.9

Heavy Heavy Light0 - 25

26 - 4546 - 60

17.718.118.8

13.313.614.1

8.99.09.4

11.612.113.0

8.79.09.7

5.86.06.5

Heavy Heavy Heavy0 - 25

26 - 4546 - 60

20.421.523.7

15.316.217.8

10.210.811.8

14.916.318.7

11.212.214.0

7.58.19.4

Wall and Sub-floor Cladding WeightsHeavy A cladding having a mass exceeding 80 kg/m2 but not exceeding 220 kg/m2 (typical examples are clay or concrete

masonry veneers)Medium A cladding having a mass exceeding 30 kg/m2 but not exceeding 80 kg/m2 (a typical example is stucco cladding)Light A cladding having a mass not exceeding 30 kg/m2 (typical examples are timber or fibre-cement weatherboards)

Roof Cladding WeightsHeavy Roofing material (cladding and sarking) having a mass exceeding 20 kg/m2 but not exceeding 60 kg/m2 (typical

examples are concrete tiles and slates)Light Roofing material (cladding and sarking) having a mass not exceeding 20 kg/m2 (typical examples are metal roofing

of normal thickness, and 6mm fibre-cement tiles without sarking)






GIB

B

RA

CIN

G S

YSTE

MS



Two Storey/Subfloor (2kPa Floor Loads) MARCH 2006

Table EQ2 Bracing demand for earthquake for various combinations of claddings for 2 storey buildings on subfloor framing and/or foundation walls

LOWERSTOREY

CLADDING

TOPSTOREY

CLADDING

ROOFCLADDING

ROOF PITCHDEGREES

SUBFLOOR STRUCTURE LOWER STOREY WALLS TOP STOREY WALLS

EARTHQUAKE ZONES

A B C A B C A B C



26 - 4546 - 60

15.015.416.1

11.311.612.1

7.57.78.1

13.413.814.6

10.010.310.9

6.76.97.3

7.17.68.5

5.35.76.4

3.53.84.3


26 - 4546 - 60

17.017.418.1

12.713.013.6

8.58.79.0

15.115.516.2

11.311.612.2

7.57.78.1

7.37.98.9

5.55.96.6

3.73.94.4


26 - 4546 - 60

22.422.823.5

16.817.117.6

11.211.411.8

19.820.021.0

14.815.215.7

9.910.110.5

8.38.69.6

6.06.47.2

4.04.34.8


26 - 4546 - 60

17.718.921.0

13.314.215.8

8.99.4

10.5

16.217.419.7

12.213.114.7

8.18.79.8

10.612.014.5

7.99.0

10.8

5.36.07.2


26 - 4546 - 60

19.720.823.0

14.815.617.2

9.810.411.5

17.919.121.4

13.514.416.0

9.09.6

10.7

11.012.415.0

8.29.3

11.2

5.56.27.5


26 - 4546 - 60

25.126.328.4

18.819.721.3

12.613.114.2

22.723.926.2

17.017.919.6

11.412.013.1

11.913.416.2

8.910.112.1

5.96.78.1

Mediumand

HeavyMedium Heavy

0 - 2526 - 4546 - 60

22.023.225.3

16.517.419.0

11.011.612.7

20.121.323.5

15.116.017.6

10.010.611.8

12.013.516.1

9.010.112.0

6.06.78.0


26 - 4546 - 60

19.319.720.4

14.514.815.3

9.79.9

10.2

17.217.618.4

12.913.213.8

8.68.89.2

8.48.99.9

6.36.77.4

4.24.55.0


26 - 4546 - 60

24.825.125.9

18.618.919.4

12.412.612.9

21.922.323.1

16.516.817.3

11.011.211.6

9.19.6

10.7

6.87.28.0

4.54.85.3


26 - 4546 - 60

31.331.732.4

23.523.824.3

15.715.816.2

27.928.429.1

21.021.321.8

14.014.214.6

12.112.613.7

9.09.5

10.2

6.06.36.8


26 - 4546 - 60

34.035.237.3

25.526.428.0

17.017.618.7

30.832.134.3

23.124.025.7

15.416.017.2

15.917.420.2

11.913.115.2

7.98.7

10.1






GIB

B

RA

CIN

G S

YSTE

MS



One and Two Storey/Concrete Slab (2kPa Floor Loads) MARCH 2006

Table EQ3 Bracing demand for earthquake for various combinations of claddings for 1 and 2 storey buildings on concrete slab-on-ground.

LOWERSTOREY

CLADDING

SINGLE ORTOP

STOREYCLADDING

ROOFCLADDING

ROOF PITCHDEGREES

TWO STOREY BUILDINGS SINGLE STOREY

LOWER STOREY TOP STOREY WALLS SINGLE STOREY WALLS

EARTHQUAKE ZONES

A B C A B C A B C



26 - 4546 - 60

9.910.311.0

7.47.78.3

5.05.15.5

5.66.06.8

4.24.55.1

2.83.03.4

3.64.04.7

2.73.03.6

1.82.02.4


26 - 4546 - 60

11.211.612.3

8.48.79.2

5.65.86.1

5.86.37.1

4.44.75.3

2.93.13.6

---

---

---


26 - 4546 - 60

13.513.914.6

10.110.410.9

6.76.97.3

6.26.77.6

4.65.05.7

3.13.33.8

---

---

---


26 - 4546 - 60

12.613.815.9

9.510.311.9

6.36.98.0

8.69.9

12.2

6.57.49.1

4.34.96.1

6.37.59.6

4.85.67.2

3.23.74.8


26 - 4546 - 60

13.915.017.2

10.411.312.9

6.97.58.6

9.010.212.6

6.77.79.4

4.55.16.3

---

---

---


26 - 4546 - 60

16.217.319.5

12.113.014.6

8.18.79.7

9.510.813.2

7.18.19.9

4.75.46.6

---

---

---

Mediumand

HeavyMedium Heavy

0 - 2526 - 4546 - 60

15.616.718.9

11.712.614.2

7.88.49.4

9.911.113.5

7.48.4

10.1

4.95.66.7

6.98.1

10.2

5.26.07.7

3.54.05.1


26 - 4546 - 60

12.913.314.0

9.710.010.5

6.46.67.0

6.77.28.0

5.05.46.0

3.43.64.0

4.24.65.3

3.23.44.0

2.12.32.7


26 - 4546 - 60

15.215.616.3

11.411.712.2

7.67.88.1

7.17.68.5

5.35.76.3

3.53.84.2

---

---

---


26 - 4546 - 60

18.318.619.4

13.714.014.5

9.19.39.7

8.79.2

10.1

6.56.97.6

4.44.65.0

5.25.66.3

3.94.24.7

2.62.83.2


26 - 4546 - 60

21.022.124.3

15.716.618.2

10.511.112.1

12.013.315.8

9.010.011.8

6.06.77.9

7.99.1

11.2

5.96.88.4

4.04.55.6

Wall and Subfloor Cladding WeightsHeavy A cladding having a mass exceeding 80 kg/m2 but not exceeding 220 kg/m2 (typical examples are clay or concrete





GIB

B

RA

CIN

G S

YSTE

MS



Single Storey/Subfloor (3kPa Floor Loads) MARCH 2006

Table EQ4 Bracing demand for various combinations of claddings for single storey buildings on subfloor framing

SUBFLOORCLADDING

SINGLESTOREY

CLADDING

ROOFCLADDING

ROOF PITCHDEGREES

FOUNDATION STRUCTURES SINGLE STOREY WALLS

EARTHQUAKE ZONES

A B C A B C



26 - 4546 - 60

10.410.811.5

7.88.18.6

5.25.48.4

7.07.58.4

5.35.66.3

3.53.84.2


26 - 4546 - 60

10.911.312.0

8.28.49.0

5.45.66.0

7.27.78.6

5.45.86.4

3.63.84.3


26 - 4546 - 60

12.212.613.3

9.29.4

10.0

6.16.36.7

7.68.19.1

5.76.16.8

3.84.14.5


26 - 4546 - 60

13.114.216.4

9.810.712.3

6.67.18.2

10.211.513.8

7.78.6

10.4

5.15.76.9


26 - 4546 - 60

13.614.716.9

10.211.012.7

6.87.48.4

10.411.714.1

7.88.8

10.5

5.25.97.0


26 - 4546 - 60

14.916.018.2

11.212.013.6

7.58.09.1

11.012.314.7

8.39.2

11.0

5.56.27.4

Mediumand

HeavyMedium Heavy

0 - 2526 - 4546 - 60

15.316.418.6

11.512.313.9

7.68.29.3

11.612.915.3

8.79.7

11.4

5.86.47.6


26 - 4546 - 60

12.313.013.7

9.49.7

10.3

6.36.56.8

8.38.89.7

6.26.67.3

4.24.44.8


26 - 4546 - 60

13.914.315.0

10.410.711.3

7.07.17.5

8.79.2

10.2

6.66.97.6

4.44.65.1


26 - 4546 - 60

21.422.524.7

16.016.918.5

10.711.312.3

15.316.719.2

11.512.514.4

7.78.39.6


26 - 4546 - 60

18.719.119.8

14.014.314.8

9.39.59.9

11.912.413.3

8.99.3

10.0

5.96.26.7






GIB

B

RA

CIN

G S

YSTE

MS



Two Storey/Subfloor (3kPa Floor Loads) MARCH 2006

Table EQ5 Bracing demand for various combinations of claddings for 2 storey buildings on subfloor framing

BOTTOMSTOREY

CLADDING

TOPSTOREY

CLADDING

ROOFCLADDING

ROOF PITCHDEGREES

FOUNDATION STRUCTURES BOTTOM STOREY TOP STOREY

EARTHQUAKE ZONES

A B C A B C A B C



26 - 4546 - 60

17.017.418.1

12.713.013.6

8.58.79.0

14.915.316.1

11.211.512.1

7.57.78.1

7.48.09.0

5.66.06.7

3.74.04.5


26 - 4546 - 60

18.919.320.0

14.214.515.0

9.59.7

10.0

16.617.017.8

12.512.813.4

8.38.58.9

7.68.29.2

5.76.26.9

3.84.14.6


26 - 4546 - 60

24.424.725.5

18.318.619.1

12.212.412.7

21.321.822.5

16.016.316.9

10.710.911.3

8.38.89.9

6.26.67.5

4.14.45.0


26 - 4546 - 60

19.720.822.4

14.815.617.2

9.810.411.5

17.819.021.3

13.414.316.0

8.99.5

10.6

11.112.515.1

8.39.4

11.3

5.56.27.5


26 - 4546 - 60

21.622.824.9

16.217.118.7

10.811.412.5

19.520.723.0

14.715.617.2

9.810.411.5

11.412.915.5

8.69.7

11.6

5.76.47.8


26 - 4546 - 60

27.128.230.4

20.321.222.8

13.514.115.2

24.325.527.8

18.219.120.8

12.112.813.9

12.313.816.6

9.210.412.5

6.16.98.3

Mediumand

HeavyMedium Heavy

0 - 2526 - 4546 - 60

24.025.127.3

18.018.820.4

12.012.613.6

21.722.925.1

16.317.218.9

10.811.412.6

12.513.916.6

9.310.512.5

6.27.08.3


26 - 4546 - 60

21.321.622.4

16.016.216.8

10.610.811.2

18.819.220.0

14.114.415.0

9.49.6

10.0

8.79.3

10.3

6.57.07.7

4.44.65.1


26 - 4546 - 60

26.727.127.8

20.020.320.9

13.413.513.9

23.523.924.7

17.617.918.5

11.712.012.3

9.39.9

11.0

7.07.48.3

4.75.05.5


26 - 4546 - 60

36.037.139.3

27.027.829.4

18.018.619.6

32.433.635.9

24.325.226.9

16.216.818.0

16.317.820.7

12.213.415.5

8.78.9

10.3


26 - 4546 - 60

33.333.634.4

24.925.225.8

16.616.817.2

29.529.930.7

22.122.423.0

14.815.015.3

12.412.914.0

9.39.7

10.5

6.26.57.0






GIB

B

RA

CIN

G S

YSTE

MS



One and Two Storey/Concrete Slab (3kPa Floor Loads) MARCH 2006

Table EQ6 Bracing demand for various combinations of claddings for single storey and 2 storey buildings on concrete slab-on-ground

BOTTOMSTOREY

CLADDING

TOPSTOREY

CLADDING

ROOFCLADDING

ROOF PITCHDEGREES

TWO STOREY BUILDINGS SINGLE STOREY

LOWER STOREY TOP STOREY SINGLE STOREY WALLS

EARTHQUAKE ZONES

A B C A B C A B C



26 - 4546 - 60

10.911.312.0

8.28.59.0

5.45.66.0

5.86.27.1

4.34.75.3

2.93.13.5

3.64.04.7

2.73.03.6

1.82.02.4


26 - 4546 - 60

12.212.513.3

9.19.49.9

6.16.36.6

6.06.47.3

4.54.85.5

3.03.23.7

3.64.04.7

2.73.03.6

1.82.02.4


26 - 4546 - 60

14.514.815.6

10.811.111.7

7.27.47.8

6.36.87.7

4.75.15.8

3.23.43.9

3.64.04.7

2.73.03.6

1.82.02.4


26 - 4546 - 60

13.614.716.9

10.211.012.7

6.87.48.4

8.910.112.5

6.77.69.3

4.45.16.2

6.37.59.6

4.85.67.2

3.23.74.8


26 - 4546 - 60

14.916.018.2

11.112.013.6

7.48.09.1

9.210.512.8

6.97.99.3

4.65.26.4

6.37.59.6

4.85.67.2

3.23.74.8


26 - 4546 - 60

17.218.320.5

12.913.715.3

8.69.2

10.2

9.711.013.4

7.38.6

10.1

4.85.56.7

6.37.59.6

4.85.67.2

3.23.74.8

Mediumand

HeavyMedium Heavy

0 - 2526 - 4546 - 60

16.617.719.9

12.413.314.9

8.38.99.9

10.111.413.8

7.68.5

10.3

5.05.76.9

6.98.1

10.2

5.26.07.7

3.54.05.1


26 - 4546 - 60

13.914.215.0

10.410.711.2

6.97.17.2

6.97.38.2

5.25.56.2

3.43.74.1

4.24.65.3

3.23.44.0

2.12.32.7


26 - 4546 - 60

16.216.517.3

12.112.412.9

8.18.38.6

7.27.78.6

5.45.86.5

3.63.94.3

4.24.65.3

3.23.44.0

2.12.32.7


26 - 4546 - 60

21.923.125.2

16.417.318.9

11.011.512.6

12.213.516.0

9.110.112.0

6.16.88.0

7.99.1

11.2

5.96.88.4

4.04.55.6


26 - 4546 - 60

19.219.620.3

14.414.715.2

9.69.8

10.2

8.99.3

10.2

6.67.07.7

4.44.75.1

5.25.66.3

3.94.24.7

2.62.83.2

GIB

B

RA

CIN

G S

YSTE

MS


GIB BRACING SYSTEMS

Notes MARCH 2006

GIB

B

RA

CIN

G S

YSTE

MS


GIB BRACING SYSTEMS CEILING DIAPHRAGM

Ceiling Diaphragms MARCH 2006

GIB ceiling diaphragms are strong and stiff horizontal bracing elements which effectively transfer loads over large distances. They are used to space bracing lines further apart than 5 metres (single top plate), or 6 metres (double top plate).A ceiling diaphragm shall be square or rectangular. Its length shall not exceed twice its width. The width being measured horizontally between supporting walls.Ceiling diaphragms under light and heavy roofs are required to comply with NZS3604:1999.

Limitations for 10mm or 13mm GIB Standard Plasterboard Ceiling Diaphragms Diaphragms not steeper than 25 degrees to the horizontal shall not exceed

7.5 metres in length.

10mm or 13mm GIB Standard Plasterboard is fastened at 150mm centres to the boundary members around the entire perimeter of the diaphragm.

Fasteners 32mm x 6g GIB Grabber Drywall Screws or 30mm x 2.8mm GIB Nails.

Limitations for GIB Ultraline Ceiling Diaphragms Diaphragms not steeper than 25 degrees to the horizontal shall not exceed 10

metres in length.

GIB Ultraline is fastened at 150mm centres to the boundary members around the entire perimeter of the diaphragm.

Fasteners 32mm x 6g GIB Grabber Drywall Screws or 30mm x 2.8mm GIB Nails.

GIB Braceline Ceiling Diaphragms Diaphragms not steeper than 25 degrees to the horizontal shall not exceed 15

metres in length.

Diaphragms not steeper than 45 degrees to the horizontal shall not exceed 7.5 metres in length.

GIB Braceline is fastened at 150mm centres to the boundary members around the entire perimeter of the diaphragm.

Fasteners 32mm x 7g GIB Braceline Drywall Screws or 35mm GIB Braceline Nails.

General Fixing Requirements for GIB Ceiling Diaphragms Linings shall be installed over the entire area of the diaphragm. Fastening shall be no less than 12mm from sheet edges. Sheets shall be supported by framing members (e.g., ceiling battens) spaced

at no more than 450mm centres for 10mm GIB plasterboard and at no more than 600mm centres for 13mm GIB plasterboard.

Sheets within the diaphragm area may be fastened and finished conventionally in accordance with the publication entitled, GIB Site Guide. All joints shall be paper tape reinforced and stopped. It is recommended that sheet butt joints are formed off framing and back-blocked (see GIB Site Guide).

Use full width sheets where possible. At least 900mm wide sheets with a length not less than 1800mm shall be used. Sheets less than 900mm wide but no less than 600mm may be used provided all joints with adjacent sheets are back-blocked (see GIB Site Guide).

Openings are allowed within the middle third of the diaphragms length and width. Fixing of sheet material to opening trimmers shall be at 150mm centres. Neither opening dimension shall exceed a third of the diaphragm width. Larger openings, or openings in other locations, require specific engineering design. Refer Openings in Bracing Elements page 27.

Fasteners are placed at 150mm centres around the ceiling diaphragm starting at 50mm and 150mm from the sheet corners.

2Wmax

W

GIB Standard Plasterboard Diaphragms

7.5m max

25 max

GIB Ultraline Diaphragms

25 max

10m max

GIB Braceline Ceiling Diaphragms

25 max

15m max

7.5m max

45 max


Sheet Widths and Lengths in Ceiling Diaphragms

Y

Y

X X

X = 900mm min or 600-900mm min provided all adjacent joints are back-blocked.

Y = 1800mm min sheet lengths at ends of ceiling diaphragms

50

100

150

150

50 100 150 150

12mm from tapered (paper bound) edge

12mm from cut edge

Fastening pattern for ceiling diaphragms

Y

Steel BattensThe GIB Rondo and USG DONN Screwfix (FC37 and FC50) battens may be used to construct GIB plasterboard ceiling diaphragms.

The battens shall be spaced at 450mm centres maximum for 10mm GIB plasterboard and at no more than 600mm centres for 13mm GIB plasterboard. The battens are fastened through both flanges directly to the ceiling framing with 32mm x 8g GIB Grabber Wafer Head Self Tapping Drywall Screws.

A steel perimeter channel is required at the perimeter of the diaphragm. The channel shall be fastened to the top plate with 32mm x 8g GIB Grabber Wafer Head Self Tapping Drywall Screws spaced at 300mm centres maximum.

The linings are fastened to the perimeter channel at 150mm centres maximum with 25mm x 6g Self Tapping Screws.

Within the diaphragm area sheets may be fastened as described in General Fixing Requirements for GIB Ceiling Diaphragms.

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GIB BRACING SYSTEMS CEILING DIAPHRAGMS

Ceiling Diaphragms Steel Battens MARCH 2006


Ceiling Diaphragm on Steel Battens Typical Fixing Detail

Ceiling joist

Rafter

Perimeter channelfastened to top plate with32mm x 8g GIB GrabberWafer Head Drywall Screwsspaced at 300mm centres

Batten ends secured toperimeter channel with14mm x 8g wafer headself tapping screws

Perimeter FasteningsFor 10mm or 13mm GIB Standard and10mm GIB Ultraline Diaphragms use32mm x 6g GIB Grabber High Thread Drywall Screws at 150mm centres or 30mm GIB Nails

GIB Braceline Diaphragms32mm GIB Braceline Screws or 35mmGIB Braceline Nails at 150mm centres

Additionalex 150 x 40mmplate

GIB Rondo or USGScrewFix ceilingbattens at 450-600mmcentres

100 x 50 mmtop plate

Timber batten

GIB plasterboard

OR

The perimeter of a ceiling diaphragm must be connected to a single continuous member along all edges. Connection to dwangs between trusses is not acceptable.

Timber battens example Steel battens with perimeter channel example

GIB plasterboard

Metal batten

GIB plasterboard

Metal batten

GIB Bracing Systems ChangesGIB Bracing Systems have undergone a thorough review as part of Winstone Wallboards ongoing programme to make GIB systems simpler, easier and faster for customers to use. Users of the previous systems will notice some significant changes. Please review this technical literature in detail to make yourself aware of these changes. The key differences are as follows: The new EzyBrace Specification Numbering System is designed to make specification, installation and identification of

GIB Bracing Systems easier. A rationalised number of bracing element types and a more consistent construction method. Fasteners must not be placed closer than 18mm to a sheet end or a cut edge or no closer than 12mm to the tapered (paper

bound) machine edge of the GIB plasterboard sheets. Some hold down details and corner fastening details have changed. A new 35mm GIB Braceline Nail replaces the 32mm GIB Braceline Nail in GIB Braceline bracing elements. GIB plasterboard sheets used in GIB Bracing Systems March 2006 must have a manufacturing date after 16 January 2006. No additional framing is required for narrow panels. Introduction of a shorter 0.4m bracing element. Ability to substitute GIB Aqualine for GIB Braceline with modified fastener patterns.Note: The bracing systems in the GIB Bracing Systems 1999-2003 technical literature will remain valid, however, transfer to the systems contained in this publication is recommended for new designs for the benefits these systems offer.

FramingGeneral framing requirements such as grade, spacings and installation shall comply with the provisions of NZS 3604:1999. Winstone Wallboards Ltd recommends the use of kiln-dried machine stress graded framing (KD MSG). To achieve the published bracing performance the minimum actual framing dimensions are 90 x 35mm for external walls and 70 x 35mm for internal walls.Wall bracing tests on GIB Bracing Systems were undertaken without nogs. Nogs are not considered to add to the bracing performance of the wall.

Fastening GIB plasterboard LiningsGIB Standard Plasterboard bracing systems must be fastened using minimum length 32mm x 6g GIB Grabber Drywall Screws or 30 x 2.8mm GIB Nails. GIB Braceline bracing systems must be fastened with 32mm x 7g GIB Braceline screws, or 35mm GIB Braceline nails.GIB plasterboard linings for designated bracing elements are fastened at 150mm centres around the perimeter of the bracing element. For GIB Standard bracing elements fasteners are placed at 50 and 150mm from the sheet corner (see page 30). For GIB Braceline bracing elements fasteners start at 50, 100 and 150mm from the sheet corner (see page 31). Fasteners must be placed 12mm from the tapered edge (paper bound) and 18mm from the cut edge.Fastening in the field of the bracing element is conventional and the screw and glue method is recommended as outlined in the GIB Site Guide.When fixing part sheets of GIB plasterboard, a minimum width of 300mm applies for bracing elements.Horizontal fixing is recommended. If fixing vertically, full height sheets shall be used where possible. Where sheet end butt joints are unavoidable they must be formed over nogs or over the studs and fastened at 200mm centres. Alternatively, the sheet end butt joints may be back-blocked.

PlywoodPlywood specified in BLP is grade D-D 7mm construction plywood manufactured to AS/NZS 2269:2004, fixed with 30 x 2.8mm flat head nails at 150mm centres around the perimeter of the bracing element and at 300mm centres to intermediate framing.

Fire Resistance and Noise Ratings10mm GIB Braceline, 10mm GIB Aqualine, 10mm GIB Noiseline, 10mm and 13mm GIB Ultraline and 10mm GIB Toughline may be substituted for 10mm GIB Fyreline in fire rated constructions. 10mm GIB Braceline and 10mm GIB Toughline may be substituted for 10mm GIB Noiseline in GIB Noise Control Systems.The fastener length for the fire rated system applies. The field of the braced element must also be fastened in accordance with the fire rated specification (adhesive not permitted).

Jointing and StoppingAll sheet joints must be paper tape reinforced and stopped in accordance with the publication entitled GIB Site Guide.

Fastening the Bracing Element to Timber FloorsFastening the bottom plate of a GIB wall bracing element to a timber framed floor must be in accordance with NZS3604:1999 with pairs of 100 x 3.75mm hand driven nails or three 90 x 3.15mm power driven nails at 600mm centres. In addition panel hold-downs, as detailed on page 29, must be installed when specified for the particular bracing element type (BL1, BL1a, BLG and BLP).

Fastening the Bracing Element to Concrete SlabsFastening the bottom plate of an external wall for bracing element GS1a is in accordance with NZS 3604:1999. On internal bracing lines, the bottom plate of wall bracing elements GS1a and GS2 may be fixed using minimum 65mm x 3.8mm shot fired fasteners fitted with 16mm discs, spaced at 150mm and 300mm from the end studs and thereafter at 600mm centres. Wall bracing elements BL1, BL1a, BLG and BLP installed on both external and internal walls require a panel hold-down connection at each end of the bracing element (see page 29). Within the length of the bracing element bottom plates are fixed in accordance with NZS 3604:1999.

In order for GIB systems to perform as tested, all components must be installed exactly as prescribed. Substituting components produces an entirely different system and may seriously compromise performance. Follow system specifications.G

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GIB BRACING SYSTEMS CONSTRUCTION

Construction Details MARCH 2006

Panel Hold-Down DetailsGIB Standard Bracing Systems GS1a and GS2 do not require specific connections at the bracing element ends.GIB Braceline Bracing Systems BL1, BL1a, BLP and BLG all have panel hold-down connections at each end of the bracing element. Refer to page 29 for construction details.

Openings in Bracing ElementsOpenings are allowed within the middle third of a wall bracing elements length and height. Neither opening dimension shall be more than one third of the element height. Wall linings are fixed to opening trimmers at 150mm centres. Small openings (e.g. power outlets) of 90 x 90mm or less may be placed no closer than 90mm to the edge of the braced element.

GIB Bracing in Water-Splash AreasBracing elements are required to have a durability of 50 years. Winstone Wallboards recommends that bracing elements are not located in shower cubicles or behind baths because of durability requirements, the likelihood of renovation, and practical issues associated with fixing bracing elements to perimeter framing members.Otherwise GIB Bracing Systems can be used in water-splash areas as defined by NZBC Clause E3, provided these are maintained impervious for the life of the building.GIB Aqualine can be used in place of GIB Standard in bracing elements. GIB Aqualine can be used in place of GIB Braceline in bracing elements 900mm or longer, provided the perimeter of the element is fixed with GIB Braceline nails or screws at 100mm centres generally, using the GIB Braceline corner fixing pattern.

RenovationWhen relining walls during the process of renovation, ensure that bracing elements are reinstated (check the building plans).

Angle BracesAngle braces serve to keep frames square during transport and construction. They also act as part of the temporary bracing of a building under construction. Where specified, metal angle braces must be placed at an angle no steeper than 55 degrees, and within the designated length of the bracing element. For elements longer than 3.6 metres, pairs of angle braces (in opposite directions) are required. Fixing of angle braces is with three 30 x 2.8mm galvanised flat head nails to top and bottom plates, and two 30 x 2.8mm nails to intermediate framing.

Top Plate ConnectionsThe top plate of a wall that contains one or more wall bracing elements shall be jointed according to the rating of the highest-rated individual wall bracing element as follows:(a) Rating not exceeding 100 bracing units: A 3kN connection as shown or by an alternative fixing of 3kN capacity in tension or

compression along the plate;(b) Rating exceeding 100 bracing units: A 6kN connection as shown or by an alternative fixing of 6kN capacity tension or

compression along the plate.

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Construction Details MARCH 2006

3kN connection to top plate with 25 x 0.9mm galvanised m.s. strap and three 30 x 2.5mm galvanised nails on each side of joint

6kN connection to top plate with 25 x 0.9mm galvanised m.s. strap and six 30 x 2.5mm galvanised nails on each side of joint

1/3 L

1/3 H 1/3 H

1/3 H

1/3 H

L

H

1/3 L 1/3L Bracing Element

90mm

No small openings (eg. power outlets) of 90 x 90mm or less in outer 90mm.

No bracing in the shaded areas.

Guidelines for Intersecting WallsGIB Bracing Elements may have intersecting walls with a minimum length of 200mm. Bracing element sheets shall be fixed and jointed as given on pages 30 and 31. Fasteners are required around the perimeter of the bracing element. Vertical joints at T-junctions (illustrated below) shall be fixed and jointed as specified for intermediate sheet joints. The bracing element length must be no less than 900mm.

Where a Wall Bracing Element is interrupted by a T or L junction the element is deemed to be continuous for the whole length (900mm in the example illustrated above).

Fixing the Perimeter of a Bracing ElementA bracing element can consist of a part sheet (such as in a 600 mm long BL1 element), or multiple sheets (such as in a 2.4 metre or longer GS1a element). The critical fasteners are located around the perimeter of a bracing element as outlined on the fastener layout pages. The perimeter of a bracing element must be connected to a continuous member such as studs or plates. Connection to a row of nogs is not acceptable.

Fixing in the Field of the Bracing ElementFixing in the field of a bracing element is conventional and for GIB wall bracing elements this means that adhesive fixing is recommended, eliminating the need for mechanical fasteners in the body of the sheets.For GIB ceiling diaphragms the screw and glue method is recommended resulting in a minimum number of mechanical fasteners along the centre line in the body of the sheets.When applied correctly, paper-tape and stopped joints within the bracing element are strong enough to transfer loads within the element and conventional fixing of intermediate sheet joints to framing is sufficient.Any sheet end butt joints within the field of the bracing element must be back-blocked in accordance with the GIB Site Guide.

Consult the GIB Site Guide for further details on recommended fixing details.

Horizontal FixingGIB Braceline linings may be fixed horizontally when linings extend under/over door or window openings. GIB Braceline fasteners are provided around the perimeter of the bracing element.

GIB Bracing Systems EzyBrace Specification Numbering SystemThe EzyBrace Specification Numbering System is designed to make specification of GIB Bracing Systems by designers and identification on site by builders and building officials more transparent. Note: the EzyBrace Specification Numbering System (and sub-components thereof) are protected by copyright.

GS = GIB Standard PlasterboardBL = GIB Braceline

BLP = GIB Braceline / PlywoodBLG = GIB Braceline / GIB Standard Plasterboard

1 = lined one side2 = lined both sides a = angle brace



Therefore,GS1a = GIB Standard Plasterboard one side with an angle braceGS2 = GIB Standard Plasterboard both sidesBL1 = GIB Braceline one sideBL1a = GIB Braceline one side with an angle braceBLP = GIB Braceline one side, Plywood on the otherBLG = GIB Braceline one side, GIB Standard Plasterboard on the other

900mm min

GIB Braceline

200m

mm

in 10mmGIB StandardPlasterboard

900mm min

GIB Braceline

10mmGIB Standard Plasterboard

Panel hold-downs

Panel hold-downs

Bracing element

GIB

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MARCH 2006Construction Details

200m

mm

in

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Panel Hold-down Details MARCH 2006

Timber Floor Internal WallBottom plate is fixed using a 12mm diameter minimum 150mm long galvanised coach screws.

Timber Floor External Wall AlternativesBottom plate is fixed using a 12mm diameter minimum 150mm long galvanised coach screw with 50 x 50 x 3mm square galvanised washer. Alternatively use the double strap detail shown on the right.

Concrete Floor Internal / External WallBottom plate is fixed using an M12 galvanised bolt set not less than 75mm into concrete and projecting sufficiently to allow for a 3mm washer and fully-threaded nut above the timber. Alternatively a proprietary fixing with equivalent capacity may be used.


Three 30 x 2.5mm galvanised flat head nails (30 x 2.5mm) to each side of bottom plate

M12 galvanised boltand 50 x 50 x 3mm square galvanised washer

Six 30 x 2.5mm galvanised flat head nails to each side of stud

400 x 25 x 0.9mm galvanised strap (strap passes underneath bottom plate)

100mmmaximum

Block to first nog fixed withthree 100 x 3.75mm nails to stud to accommodate double strap

Six 30 x 2.5mm galvanised flat head nails

to each stud and joist

Two 300 x 25 x 0.9mm galvanised straps

Notes: Additional thickness and/or corrosion protection is required in exposed and sheltered applications. (Consult NZS 3604:1999).To maintain a flush surface for the wall linings, it is recommended that hold down straps are checked into the framing.




12mm x 150mm galvanised coach screw and50 x 50 x 3mm

square galvanised washer

100mm maximum




Option 1 Option 2

100mm maximum

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Fastener Layouts GIB Standard Bracing Elements MARCH 2006

GS2 (lined both sides)(Vertical Fixing)

Daub of GIBFix adhesive at 300mm centres to intermediate studs and nogs

For 10mm GIB Standard Plasterboard and any other 10mm and 13mm GIB plasterboard32mm x 6g GIB Grabber Drywall Screws or 30mm GIB Nails at 150mm centres to perimeter of bracing element

Single 32mm x 6g GIB Grabber Drywall Screws or 30mm GIB Nails where sheets cross studs

32mm x 6g GIB Grabber Drywall Screws or 30mm GIB Nails at 150mm centres to perimeter of bracing element

GS1a (lined one side)(Horizontal Fixing)

Daub of GIBFix adhesive at 300mm centres to intermediate studs

GS1a (lined one side)(Vertical Fixing)



Single 32mm x 6g GIB Grabber Drywall Screws or 30mm GIB Nails where sheets cross studs


GS2 (lined both sides)(Horizontal Fixing)


Fixing the perimeter of a GIB Standard Plasterboard bracing elementFasteners are placed no closer than 12mm to the tapered (paper bound) machine edge of the GIB plasterboard sheets. Fasteners are placed no closer than 18mm to a sheet end or a cut sheet edge.For GIB Standard bracing elements fasteners are placed at 150mm centres around the bracing element perimeter, starting at 50 and 150mm from the sheet corners.



50

100

150

150

50 100 150 150


18mm from cut edge

GIB Standard PlasterboardFastening pattern for GIB Standard bracing elements

Angle brace Angle brace

Single 32mm x 6g GIB Grabber Drywall Screws or 30mm GIB Nails at 300mm centres

Single 32mm x 6g GIB Grabber Drywall Screws or 30mm GIB Nails at 300mm centres

BL1a (lined one side)(Vertical Fixing)

32mm GIB Braceline Screws or 35mm GIB Braceline Nails at 150mm centres to perimeter of braced element

32mm x 6g GIB Grabber Drywall Screws or 30mmGIB Nails at 300mm centres


BL1a (lined one side)(Horizontal Fixing)

32mm x 6g GIB Grabber Drywall Screws or 30mm GIB Nails where sheets cross studs


32mm GIB Braceline screws or 35mm GIB Braceline nails at 150mm centres to perimeter of braced element

BL1 (lined one side)


Daubs of GIBFix adhesive at 300mm centres to intermediate studs

Refer page 27 re fastener details for Plywood


BLP (lined both sides)

Hold-downs

Daubs of GIBFix adhesive at 300mm centres to intermediate studs

The 10mm GIB Standard Plasterboard on the reverse face is fastened as per system GS1a


BLG (lined both sides)

Hold-downs

Hold-downs

Hold-downs

For 10mm GIB Braceline, 10mm GIB Noiseline and 10mm GIB Toughline

Fixing the perimeter of a GIB Braceline bracing elementFasteners are placed no closer than 12mm to the tapered (paper bound) machine edge of the GIB plasterboard sheets. Fasteners are placed no closer than 18mm to a sheet end or a cut sheet edge.For GIB Braceline systems, fasteners are placed at 150mm centres around the bracing element perimeter, starting at 50, 100 and 150mm from the sheet corners.

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Fastener Layouts GIB Braceline Bracing Elements MARCH 2006



50 5

0 50

15

0 15

0

50 50 50 150 150


18mm from cut edge

GIB BracelineFastening pattern for GIB Braceline bracing elements

Angle brace Angle brace

Hold-downs

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GIB BRACING SYSTEMS

GIB Bracing System Installation Checklist MARCH 2006

Contract ID

Site Address

Specifier

Building Contractor

Plasterboard Installer

Check carried out by

Date

Reference Material: GIB Bracing Systems, GIB Site Guide (Edition current at time of installation)

PRE LINING Y N CHECKED BY DATE

Bracing element position corresponds with the bracing plan

Hold-down straps correctly positioned and installed (systems incorporating BL)

Hold-down straps checked in flush with framing

Hold-down bolts correctly positioned and installed

No power points or light switch outlets situated within 90mm of the edge of the element. Easier to move now than later.

Any opening larger than 90 x 90mm is positioned in the middle third of the element both vertically and horizontally

Braces extend from top to bottom plates. Angle braces installed correctly

No bracing elements situated within a shower cubicle or above a bath

POST LINING Y N CHECKED BY DATE

Correct corner fastening pattern has been used for the specified system

Perimeter fastenings are correctly spaced for the system being used

Correct fasteners have been used. 32mm GIB Grabber or GIB Nails for all GS systems and 32mm GIB Braceline screws or 35mm GIB Braceline nails for BL systems.

Sheet end butt joints within the bracing element are back-blocked

CEILING DIAPHRAGMS Y N CHECKED BY DATE

Steel battens are directly fixed to framing. Clip system cannot be used in ceiling diaphragm applications.

Perimeter of the diaphragm is fixed to a single continuous member along each edge

No sheets shorter than 1800mm used in diaphragm

End sheets are a minimum of 600mm wide x 1800mm long

Longitudinal joint adjacent to end sheet is back-blocked if end sheet is between 600mm and 900mm wide

Corner fastenings correct

Sheet end butt joints back-blocked

GIB ProductsManufactured by Winstone Wallboards Lt

gib bracing

Documents

bracing units bus

new publication

pagegib bracing system

wind earthquake

current publication

gib helpline

gib branded components

earthquake design tables