ht 98/33 final1€¦ · technical staff of james hardie building products ltd.phone the james...

July 1998

Harditex™ is the ideal lightweight cladding for

a monolithic finish, yet it provides you with the

comfort and peace of mind that comes with the

stability and strength of James Hardie fibre cement.

The only limiting factor is your imagination.

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Checklist of requirements for Harditex applications. . . . . 2

Accessories for James Hardie Harditex . . . . . . . . . . . . . . 3

SECTION 1: PRODUCT INFORMATION • HANDLING ANDCUTTING • SAFETY

Product description . . . . . . . . . . . . . . . . . . . . . . . . . . 4

New Zealand Standard . . . . . . . . . . . . . . . . . . . . . . . 4

Installation – technical details . . . . . . . . . . . . . . . . . . . 4

Sheet bracing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Sheet properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Sheet sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Sheet edge finish. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Sheet mass and moisture content . . . . . . . . . . . . . . . . 5

Fire properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Handling and storage. . . . . . . . . . . . . . . . . . . . . . . . . 5

Cutting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Score-and-snap. . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Hand guillotine . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Hand sawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Power sawing, site recessing and hole forming . . . . . . . 6

Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . 6

Power sawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Hardishear power cutter . . . . . . . . . . . . . . . . . . . 6

Site recessing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Hole forming. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Recommended safe working practices. . . . . . . . . . . . . 7

SECTION 2: FRAMINGGeneral requirements . . . . . . . . . . . . . . . . . . . . . . . . 8

Timber frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Steel frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Frame set-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Batten requirements . . . . . . . . . . . . . . . . . . . . . . . . . 9

Batten specification . . . . . . . . . . . . . . . . . . . . . . . . 9

Building paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Curved applications. . . . . . . . . . . . . . . . . . . . . . . . . . 9

Exterior frame straightness . . . . . . . . . . . . . . . . . . . . . 9

Bracing sheets stopped below top plate . . . . . . . . . . . . 9

SECTION 3: SHEET LAYOUT • FIXINGStructural details . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Door and window openings . . . . . . . . . . . . . . . . . . . 10

Flashings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Ground clearance . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Slab on ground. . . . . . . . . . . . . . . . . . . . . . . . . . 12

Timber piles. . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Fixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

SECTION 4: CONTROL, EXPANSION AND CORNER JOINTSControl joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Expansion joints . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Base sheet jointing details . . . . . . . . . . . . . . . . . . . . . 18

Corner joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

SECTION 5: BRACING SYSTEMSBracing ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Framing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Fixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Bracing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Sheets stopped below top plate . . . . . . . . . . . . . . . 21

Bracing panel height . . . . . . . . . . . . . . . . . . . . . . 21

General notes for all bracing figures . . . . . . . . . . . 21

SECTION 6: NEW ZEALAND BUILDING CODE COMPLIANCENew Zealand Building Code (NZBC) . . . . . . . . . . . 34

Durability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Serviceable life . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

BRANZ appraisal . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Bracing systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Maintenance definition . . . . . . . . . . . . . . . . . . . . 34

Energy efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Fire-resistance ratings (load bearing) . . . . . . . . . . . . . 35

Acoustic ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

SECTION 7: FINISHING THE SYSTEMHarditex sheets . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Architectural shapes . . . . . . . . . . . . . . . . . . . . . . . . . 37

Jointing and coating systems . . . . . . . . . . . . . . . . . . . 37

System essentials . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Decking bearers . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Fencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Architectural details . . . . . . . . . . . . . . . . . . . . . . . . . 37

Windows and doors . . . . . . . . . . . . . . . . . . . . . . 37

Transitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Harditex jointing and coating systems manufacturers 40

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H A R D I T E X T E C H N I C A L I N F O R M A T I O N

Cover:A Master Builders Award winning Neighbourhood Home byFletcher Homes Ltd at Clemow’s Orchard,Albany. The cladding

substrate is Harditex™ Premium, by James Hardie.

Introduction

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This document is divided into sevensections:

Sections 1 to 5:The selection,working, framing and installation ofJames Hardie Harditex sheets,including bracing applications.

Section 6: Requirements forcomplying with the New ZealandBuilding Code including fireresistance, acoustic and bracingratings.

• Providing the sheets are installedand maintained in strictaccordance with this specificationthe Harditex sheet performancewill be warranted by JamesHardie in terms of therequirements of the NewZealand Building Code for 15years.

Section 7:The joint and coatingsystems applied by specialistindependent contractors.

• The proprietary jointing andcoating procedures areoutside the control of JamesHardie, therefore allwarranties for performanceof the coating systems mustbe given by the independentjointing and coatingmanufacturers and theirlicensed applicators.

NOTE: It is important that you refer to‘Working Safer with Silica-basedProducts’ prior to working with thisproduct. From more information or acopy of this leaflet, contact James HardieHelpline on 0800 808 868.

Refer also to pages 6 and 7 of thisbrochure.

Current design trends favour the texture-plastered look with monolithic wallsfrequently highlighted with a variety of architectural design features.

Harditex is the ideal cladding for a monolithic finish, because it providesyou with the comfort and peace of mind that comes with the stability andstrength of James Hardie fibre cement. In other words, the best of bothworlds.

When using Harditex the only limiting factor is your imagination. It can beused to create anything from subtle beauty to strong bold statements thatmake the most of colour, texture and style. So the latest design trends areyours for the asking.

Design flexibility with Harditex is further enhanced with the use ofpolystyrene shapes which provide a wide range of options for architecturaldetail. Please phone the James Hardie Building Systems Helpline on 0800PANEL4U (726 3548) for more information on polystyrene shapes.Polystyrene shapes are applied by the coating contractor of your choice.

The Harditex base sheet, readily identified by its pink colour in its ‘raw’ state,has been developed to provide a durable substrate for a range of texturedcoatings.The coating of your choice is applied by a coating contractorlicensed by the coating manufacturer. Section 7 gives further details.

Harditex is available in a regular 7.5mm sheet which is ideal for mostresidential applications.Where there is a need for superior strength, finish andimpact resistance, such as in light commercial construction, or some residentialhomes, 9mm Harditex Premium is the answer. Installation is the same as for7.5mm Harditex , so the choice is yours.

Harditex 7.5mm and Premium 9mm Checklist

James Hardie Harditex 7.5mm and 9mm is integrally coloured pink to identify the product.

• Framing – studs, plates and nogs must be dry, true and straight prior to fixing sheets (page 8)

• All sheet edges must be fully supported by framing (page 8) (generally sheets are fixed vertically).

• Studs 600mm centres maximum, nogs 1200mm centres maximum (page 8)

• Sheets are to be fixed, stopped and coated only when dry (page 5)

• Stack sheets flat in a dry area and protect from damage (page 5)

• When cutting, drilling, or grinding, safety glasses and an approved dust mask must be worn (pages 6 and 7)

• A breather-type building paper complying with NZS 2295 must be used behind Harditex sheets (page 9)

• In two-storey construction a horizontal control joint must be used at floor joist level (page 8)

• Sheet edges should not coincide with sides of doors and windows unless they are control or expansion joints. (Controljoints 5.4m centres, expansion joints 14.4m centres) (page 10)

• Vertical joints are to be offset when walls are more than one sheet high (page 10)

• The tops of windows and doors must have head flashings (page 10)

• Gap between sheets is 1-2mm (page 11)

• Nail sheets from the centre of the sheets outward to avoid drumminess (page 13)

• Nailing – 150mm centres to perimeter and centre of sheet, 12mm from edges and 50mm from corner (nails 40 x 2.8mm galvanised flat-head or stainless steel driven flush with sheet surface) (page 12)

• Internal corners – use Inseal 3259 (80mm wide and 1.5mm thick behind sheets) (page 18)

• Bracing ratings have been determined by BRANZ tests and ratings are shown on page 19

• Stainless steel nails (40mm x 2.8mm) must be used for all bracing panels and in severe coastal environments (pages 21and 34)

• All stopped joints must have both edges recessed. Control joints should have square edges (page 15)

• Sheets must be coated within 3 months of fixing (page 34)

• External corners – use PVC external corner mould – perforated (page 18)

• Colours must have a light-reflective value (LRV) of 40% minimum regardless of gloss level (page 37)

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Accessory Size (mm) Material/Appearance

Butynol Inseal strip12-metre roll

Width 5080 (corner joints)

Black

Inseal 3109 sealing strip12-metre roll

6 x 10 Black compressible foam(self-adhesive one side)

Inseal 3259 sealing strip50-metre roll

1.5 x 501.5 x 80 (cornerjoints)

Black compressible foam(self-adhesive one side)

Hardiflex® nails:galvanised flat-headstainless steelNote: These nails are notstocked by James Hardie.Refer to your distributor.

40 x 2.840 x 2.8

Hot-dipped galvanised steel316 stainless steel

Weatherboard nails:galvanised flat-headstainless steelNote: These nails are notstocked by James Hardie.Refer to your distributor.

50 x 2.850 x 2.8

Hot-dipped galvanised steel316 stainless steel

7.5mm horizontal flashing Length 3000 PVC/Bone

9mm horizontal flashing Length 3000 PVC/Bone

External corner mould Length 3000Length 2700Length 2400

PVC/White

Stainless steel wood screw 30 x 4.2 316 stainless steel100 screw bag5 kg screw boxes

Accessories for 7.5mm and 9mm Harditex

Table 1: Accessories for James Hardie Harditex

40mm

6.8mmmin.

2.8mm

10mm6mm

50mm or 80mm

10mm

1mm Butynol

Inseal 3109

65m

m

30mm

40mm

50mm

7mmmin.2.8mm

16mm

30mm

55m

m

16mm

4.2m

m

30mm

Fixing holes at85mm centres

Phillips drive head

Product descriptionHarditex is a sheet materialmanufactured in New Zealand byJames Hardie from fibre cement whichis a composition of treated cellulosefibre, Portland cement, finely groundsand and water. Following forminginto sheets the product is cured byhigh-pressure steam autoclaving.

Harditex 7.5mm and 9mm thick isused as the exterior cladding to timberand steel framing whilst also being theexterior bracing system (for timberframe only) when jointed and coated.

The product is identified by the fixingpattern printed on the face of thesheets, by a pink colour tintthroughout the thickness and by thename Harditex printed on thereverse face of the 7.5mm sheet.

Harditex Premium 9mm sheets havethe name Harditex Premium printedon the face side of the sheet.

Harditex Premium has a sanded faceand is used where superior finish,strength and impact resistance aredemanded.

New Zealand StandardHarditex is manufactured to conformto NZS/AS 2908.2-1992: CelluloseCement Products - Flat Sheets.

Installation – technicaldetailsHarditex must be installed inaccordance with the details of thespecification. James Hardie hasevaluated a number of proprietaryjoint and coating systems.Thesesystems must be applied by licensedapplicators nominated by the coatingmanufacturer.A list of proprietary

jointing and coating systems is givenon page 40.A Harditex installationvideo is available on request fromJames Hardie.

Sheet bracingHarditex 7.5mm and 9mm sheets aresuitable sheet materials for wall bracingin terms of NZS 3604. For full detailsof the Harditex bracing systems referto pages 19-33.

Sheet propertiesThe Harditex cladding sheet is alightweight fibre cement substratewhich is resistant to permanentmoisture damage, and which will notrot or burn.The sheet is securely fixedto the timber or steel framing bynailing or screwing.

Any special conditions or unusualapplications must be referred to thetechnical staff of James HardieBuilding Products Ltd. Phone theJames Hardie Helpline: 0800 808 868.

NOTE: Steel framing is not included inthis brochure. Information is available fromJames Hardie on request.

Sheet sizesHarditex sheet lengths and widths aregiven in Table 2.NOTE: All dimensions are nominal.

All these specifications can be used for7.5mm- and 9mm-thicknessHarditex .

Sheet edge finishThe sheets have stepped recesses on bothsides and one end to take a reinforcedflush joint detail applied by the coatingcontractor.This allows for a monolithicfinish of both vertical and horizontaljoint details. (Refer Fig. 1.)

Section 1: Product information • Handling and cutting • Safety

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Note: The stepped recessed edge needsless jointing compound and takes less timeto set and finish. It gives a flatter, neater andstronger joint.

Fig. 1 SHEET EDGE FINISH– STEPPED RECESS

40mm nom.

1.5m

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Note: Sheets must be allowed to dry beforefixing otherwise drying shrinkage can occurand this will be detrimental to the finished job.

Fig. 2 HANDLINGHARDITEX™ SHEETS

Carry sheet in the vertical position

7.5 1200 ✔ ✔ ✔ ✔

9 1200 ✔ ✔ ✔

Table 2: Harditex sheet sizes

Thickness Width Length (mm)

(mm) (mm) 1800 2400 2700 3000

Sheet mass and moisturecontentThe approximate mass of 7.5mmHarditex at equilibrium moisturecontent (EMC) is 10.7 kg/m2, 9mm is13.4 kg/m2.

Harditex sheets must be allowed todry to EMC before fixing to framing,otherwise drying shrinkage can occurwhich will be detrimental to thefinished job.

NOTE: Dry Harditex sheets vary inmoisture content with the seasons andprevailing weather conditions.As a guide, adry sheet can vary between 6% moisturecontent in summer and 14% in winter.

The sheets are also defined as havingan equilibrium moisture contentwhere the sheet is under conditions of25°C and a 55% relative humidity.

Moisture content at EMC 7%Moisture content at saturation 33%

Fire propertiesHarditex will not burn and has thefollowing Early Fire Hazard Indices(tested to AS 1530 part 3 1982).

Ignition Index 0Flame Spread Index 0Heat Evolved Index 0Smoke Developed Index 0-1

NOTE: Zero is the best possibleresult.

C3 Spread of FireThe Harditex substrate for exteriortexture coatings with a surface finishcoating of not more than 1mm inthickness is considered to meet theperformance provisions of NZBCC3.3.5 when used to clad allbuildings.

When the applied surface finishcoating is more than 1mm inthickness, the coating manufacturer

must be consulted to obtainIgnitability Index and/or non-combustibility data for the substratecoating system. Performancerequirements are given in C3/AS1Table 2.

Handling and storageHarditex sheets must be stacked on asmooth, level surface. Edges andcorners must be protected fromdamage. Carry sheets on edge. (ReferFig. 2.) Store under cover and keep dryprior to fixing, jointing and coating.

CuttingSuitable cutting methods are ‘score-and-snap’, hand guillotine, handsawing, power sawing and theHardishear power cutter.

Score-and-snap‘Score-and-snap’ is a fast and efficientmethod of cutting using JamesHardie’s special tungsten-tipped ‘score-and-snap’ knife. (Refer Fig. 3.)

• Preferably score from the face sideof the sheet.

• Position the straight-edge along theline of the cut.

• Score against the straight-edge andrepeat the action to obtain adequatedepth for a clean break – normallyone-third of the sheet thickness.

• Snap upwards to achieve break.

• Clean up edges with a rasp ifnecessary.

Hand guillotineThe Bentley hand guillotine producesclean, straight edges. Make the guillotinecut on the off-cut side of the line toallow for the thickness of the blade.(Refer Fig. 4.)

Hand sawingHand sawing is suitable for generalcutting operations and for small cuts,notchings or small penetrations.

Preferably use an old handsaw.A quickforward jabbing action is best.

For neatness, mark out the cuts to bemade on the face side of the sheet.Where small notches are to be made,cut the two sides with the handsaw orhand guillotine, score along the backwith the ‘score-and-snap’ knife andsnap upwards. (Refer Fig. 5.)

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Fig. 3 SCORE-AND-SNAPMETHOD

Scored edge

Straight-edge

Fig. 4 HAND GUILLOTINEMETHOD

Pack sheet clear of floor

Fig. 5 HAND SAWINGMETHOD

Saw cuts

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Power sawing, site recessingand hole formingSafety precautionsWhen cutting, drilling or grinding,safety glasses and a dust mask mustalways be worn.This can be either adisposable P2 dust mask or a half maskwith a disposable cartridge.The maskmust fit properly and be approved foruse with dust.The mask must berepaired or replaced as necessary andcleaned often.

All dry power-cutting operations mustbe carried out in open-air situations orin well ventilated spaces and dustextraction equipment must be fitted tothe dry-cutting tool.

All aspects of wet and dry cuttingmust comply with the latestregulations of the Occupational Safetyand Health (OSH) division of theLabour Department. (Refer to‘Recommended safe workingpractices’, page 7.)

Power sawingPower cutting using a dry diamond orcarborundum saw blade gives anacceptable edge.

Clamp a straight-edge to the sheet andrun the saw base plate along thestraight-edge when making the cut.

Hardishear power cutterA Hardishear power-cutting tool canbe used for 7.5mm and 9mmHarditex. (Refer Fig. 6.)

For details and availability of theHardishear , phone the James HardieHelpline on 0800 808 868.

Site recessingWhere it is necessary to produce aground recess detail on site, use aportable angle grinder fitted with astrong, thick carborundum blade orsimilar and a dust extraction unit fittedto a vacuum cleaner. Do all edgegrinding outside in a well-ventilatedarea. Run down the edge of the faceto produce a stepped recessapproximately 40mm wide but notexceeding 1.5mm at its deepest point.(Refer Fig. 7.)

A suitable tool for this is the HitachiEasy Bevel (refer Fig. 8), available fromAccent Tools, 232 Bush Rd,Albany,Auckland, phone (09) 415-2545, ormajor Hitachi distribution outlets.

Fig. 6 HARDISHEAR™

POWER CUTTER

Cutting head

Fig. 7 SITE-GROUNDRECESSED-EDGEDETAIL

40mm nom.

1.5m

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7.5m

m o

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Preferred site recess shape

Fig. 8 HITACHI EASY BEVEL

Hole formingSmall rectangular or circular holes canbe achieved by drilling a series of smallholes around the perimeter of the holethen tapping out the waste pieces fromthe sheet face.Tap carefully to avoiddamage to sheets, and clean roughedges with a rasp. (Refer Fig. 9.)

Large rectangular openings, such as forwall ventilators, can be made by thefollowing method:

• Mark out the hole on the face sideof the sheet.

• Drill a hole in each corner asshown in Fig. 10.

• Score to the outside of the holes tohalf the sheet depth.

• Turn sheet over and score thereverse face to half the depth usingthe drilled holes as a reference.

• Knock out the scored material toform the hole. (Refer Fig. 10.)

Alternatively, large rectangular holescan be formed with a 110mm-diameter diamond-blade saw.

For smooth, clean-cut circular holes:

• Mark the centre of the hole on thesheet.

• Pre-drill a ‘pilot’ hole.

• Using the pilot hole as a guide, cutthe hole to the appropriatediameter with a tungsten-tippedring cutter fitted to a heavy-dutyelectric drill. Sandvik ring-cuttingkits or similar are available for thispurpose.

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Note: Do not form holes through sheets withcold chisels, heavy hammers or any other‘aggressive’ methods. Such forceful methodswill damage sheets and may cause otherproblems at a later date.

Fig. 9 CIRCULAR HOLEFORMING

Fig. 10 RECTANGULARHOLE FORMING

Drill holesin corners

Scorearound

perimeter

Breathing in fine silica dust liberated when working with products such as fibre cement, clay and concrete is hazardous.Over time, usually a number of years, this may result in lung bronchitis, silicosis and lung cancer. Work safely with fibrecement sheets by following the precautions described below.

• Minimise dust when cutting sheets, by using either Score-and-Snap knife, Bentley hand guillotine or Heavy DutyHardishear.

• When using other power tools or abrasive hand tools, wear approved personal protective equipment, i.e., P1 or P2 dustmask and safety goggles.

• Ensure containment of dust during clean-up and disposal.These precautions are not necessary when stacking, unloading or handling fibre cement products.

For more information contact the James Hardie Helpline: 0800 808 868

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaFace masksP1 or P2 type

Safety gogglesapproved to AS 1337

Clean-up:wet down or

vacuum

Disposal:containment

of dust

Recommended safe working practices

Section 2: Framing

General requirementsNOTE: For Harditex bracing systemsframing requirements refer to page 20.

Correct design of the framework andcareful consideration of the sheet set-out (refer page 10) to minimise jointswill significantly contribute to thelong-term success of all flush-jointedwall systems.Allowance must be madefor the provision of both horizontaland vertical control joints andexpansion joints at the design stage(refer pages 15-17).

All Harditex sheet edges must befully supported by the framing.Framing must be rigid and not rely onthe Harditex for stability.

All studs and nogs must be checkedwith a long straight-edge for line andface accuracy to ensure the timberstud wall has a true and accurateoutside face before the Harditex

sheet is fixed (refer Table 3, page 9).

Harditex must not be used in full polehouse construction where excessivestructural movement could beencountered. It can be used on theupper level of pole platformconstruction where the polesterminate at the underside of the floorlevel.

Timber frameAll timber framing must be inaccordance with NZS 3604 Code ofPractice for Light Timber FrameBuildings.

Specific design to NZS 4203:1992 andNZS 3603:1993 can also beundertaken providing:

• The framing centres do not exceedthose given in this specification.

• The framing member widthsconform to this specification.

Standard green frame or kiln-driedtimber can be used for single-storey ordouble-storey construction with thefollowing exceptions:1. When the inter-storey wall height

exceeds the sheet length andhorizontal joints need to beintroduced, all timber framing mustbe kiln dried to minimise verticalshrinkage as this can causehorizontal joint pouting.

2. When the one sheet spans from topto bottom plate of the same storey,standard green frame can be used.

3. Standard green frame or kiln-driedtimber can be used for floor joists.Because green floor joists can havesignificant shrinkage and kiln-driedjoists can also move, a horizontalcontrol joint must be located atthe floor joist level as shown inFigs 25, 26 or 27.

4. Harditex must not be fixed totimber framing with a moisturecontent in excess of 24% and forfully air-conditioned buildingsmoisture content must not exceed18% in accordance with NZS3602:1990.

NOTE: Kiln-dried timber will minimiseshrinkage.This is particularly important formulti-storey buildings and applicationswhich are more than one sheet length inheight.

Refer also to ‘Structural details’, page10, for further information.Timberframing must be either ex 50mmwide, or when kiln-dried is used,35mm minimum finished size atintermediate studs and 45mm wide atall sheet joints to give sufficient widthto fix sheets at joints. Studs must be atmaximum 600mm centres betweencontinuous top and bottom plates andnogs at maximum 1200mm centres.(Refer Fig. 22.)

SPECIAL NOTE: 35mm-wide kiln-dried timber must not be used at anysheet cladding or lining joints becauseof insufficient nailing width.

Steel frameDetails for steel frame can be obtained byphoning the James Hardie Helpline on0800 808 868.

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Frame set-outIt will be more economical when thetimber is pre-cut or set out to suit theexterior cladding rather than theinterior lining. For a typical exampleof this refer Fig. 11.

Batten requirementsBattens for fixing the sheets arerequired when the sheets are fixedover:

• Gypsum board or fire-rated gypsumboard

• Softboard, polystyrene or similarsheets

• Concrete, masonry block or brickwalls.

Batten specification• Timber battening is to have a

minimum thickness of 40mm togive adequate sheet nailpenetration.

• Steel battens are to be a minimumof 72mm wide x 23mm deep x0.55mm thick and to have abearing surface of 37mm. Battensare to be galvanised steel (257g/m2

zinc coating) and fixed tomanufacturer’s specifications.

All battening centres and sheet fixingis to be strictly in accordance with theframing and fixing required by thisspecification. Care must be taken toensure the battens are packed andaligned to give a true even surface forthe sheets to be fixed. Check the faceof the battens with a long straight-edge before fixing the sheets.

Building paperA breather-type building papercomplying with NZS 2295, asrequired by NZS 3604, must be fixedto the outside face of timber framingbefore fixing the Harditex sheet.Note that for clarity building paper isgenerally not shown in the drawings inthis brochure.

Curved applicationsHarditex can be used for curvedapplications.The minimumrecommended radius for convex orconcave fitted sheets of 7.5mm and9mm thickness is 1800mm.The sheetsmust be bent only along the length.

NOTE: The framing is to be closed up to400mm centres for curved applications togive extra support to the curve.

Kiln-dried framing must be usedwhen horizontal sheet joints areintroduced into the height of thecurved frame.

Exterior frame straightnessTo achieve a visually acceptable finishto the textured Harditex the framestraightness tolerances listed in Table 3must be used.

Bracing sheets stoppedbelow top plateWhere bracing sheets are stoppedbelow the level of the top plate, referto Fig. 49 for framing details.

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Note: When alternative 35mm and 45mmkiln-dried studs are used it is useful to setout the alternative studs in one directionaround the building, working from onereference point.

Insidelining

Fig. 11 FRAME AND STUDSET-OUT

600mm 600mm

1200mmHarditex™ sheet

45mm stud tosheet joint

Table 3: Frame straightnesstolerances

Straight-edge Tolerance(mm) (mm)

Good finish600 21200 33000 4

Measured across plastered site joints:200 0.5

Excellent finish600 11200 23000 3

Measured across plastered site joints:200 0.5

Note: These tolerances apply to anypoint on the face of the Harditex

cladding when measured with astraight-edge in any direction.

Section 3: Sheet layout • Fixing

Structural details• Harditex cladding systems are

suitable for both commercial anddomestic applications.These mustbe limited to two storeys in heightunless specific design is undertakenfor the attachment of theHarditex sheets to the structure.This is because the Harditex

sheets form a very rigid elementand will act as a structuraldiaphragm. If a high wall isincorrectly designed the lateralforces on the building may beabsorbed by the Harditex sheetsbefore the designed structuralbracing systems, which could leadto serious damage to the sheetfixing and jointing.This aspect mustbe structurally considered by anengineer before work of greaterthan two storeys is undertaken.Harditex has substantial sheetbracing performance (refer topage 19).

• All sheets must be installedvertically for timber frameconstruction as this method givesthe best overall performance.

• Sheets may, however, be laidhorizontally for timber frame whena depth of cladding not more than1200mm high is required (onewidth of sheet). Examples arefascias, spandrels or narrow bands ofcladding along the building. Referalso to ‘Curved applications’, page 9

Door and window openingsWhere sheet joints are above and/orbelow door or window lines, jointsmay crack due to structuralmovement. Fix sheets across door andwindow openings so sheet edges donot coincide with the side of thewindow or door, then cut away waste.(refer Fig. 12.)

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Notes:1. When Inseal 3109 6mm x 10mm is used between the Harditex™ and the flashing the upstand

can be reduced to 45mm.2. When the sheet is brought hard down onto the flashing for appearance reasons, the bottom

edge of the sheet must be back-sealed. A continuous 6mm x 10mm Inseal 3109 strip mustalso be used to seal the back of the sheet.

3. For details of recessed windows refer to pages 38 and 39.

A

A

Fig. 14 STANDARD WINDOW OR DOOR HEAD DETAIL

Notch Harditex™ to fitflashing, make neat,

tight-fitting cut then sealwith silicone paintable

sealant

Headflashingunder

Take flashing30mm past

edge window

Harditex™

Harditex™ sheet

Aluminium headflashing

Window

Framingand lintel

75mmupstand to

head flashing

Aluminium window

Building paperover flashingupstand

Detail sheetto flashing

5mm min. gap

Coating

Flashing

75m

m u

psta

nd

Insealposition whenrequired(refer Note 2)

Section A-A

Refer Fig.15

Fig. 12 SHEET LAYOUT FOROPENINGS

200mmmin.

Notes:1. When horizontal sheet joints are used for

timber frame only kiln-dried timber mustbe used.

2. In multi-storey applications the horizontalcontrol joints must coincide with floor joists(refer Figs 25, 26 and 27).

Fig. 13 OFFSET SHEETSET-OUT

Harditex™

sheetverticallyfixed

Vertical jointsto be tapedand jointedas shown inFig. 31

Horizontaljoints to befinishedsimilarly tovertical jointsexcept themaximum gapbetween sheetsto be 1mm

Offset sheet joints

5400

mm

max

. bet

wee

n co

ntro

l joi

nts

An alternative method toaccommodate this possibility is toprovide an expressed joint at windowedges flashed with Inseal or a sealant-filled joint. (Refer Figs 23 and 24.)

When Harditex is fixed more thanone sheet high on large walls the jointsmust be offset. (Refer Fig. 13.)

FlashingsThe tops of windows and doors mustbe flashed with a head flashing (referFigs 14 and 15). Use pre-shapedaluminium flashings.The sides of thewindows must be sealed with Inseal3109 6mm x 10mm strips or apaintable silicone.

The Inseal strips are adhered to thewindow overlap before installation(refer Fig. 16).

When silicone sealant seals are usedthe continuous bead of sealant isapplied under the window overlapbefore the window is fixed (referFig. 16).

NOTE: Silicone applied as a fillet to thewindow edge and onto the cladding is notan effective weathering method and mustnot be used.

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Fig. 15 HEAD FLASHING DETAIL

Harditex™

Aluminiumhead

flashing

Aluminiumwindowsection

Building paper

For flashingupstanddimensionsrefer Fig. 14

Fig. 16 SIDE FLASHING DETAIL (INSEAL OR SEALANT SEAL)

Inseal 3109 6mm x 10mmor flexible sealant betweenwindow and Harditex™ to

give a positive seal

Harditex™

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When aluminium joinery is used sillflashings give good long-termprotection (refer Fig. 17).

The sill flashing needs the end turnedup to be effective (refer Fig. 18).

Ground clearanceSlab on groundThe concrete slab floor-to-grounddimension must be 150mm minimumto comply with paragraph EI/ASI2.0.1(a) of the New Zealand BuildingCode.

The sheet must finish no closer to theground than shown in Fig. 19 or thealternative detail in Fig. 20 or, ontimber pile, as shown in Fig. 21. In nocase can the Harditex be taken closerthan 50mm to the finished ground,whether paved or unpaved.

Timber pilesWhen timber-piled foundations areused, the Harditex can be carried towithin 50mm of the finished groundlevel (refer Fig. 21).

FixingNail at 150mm centres to theperimeter of sheets and intermediatestuds and nogs (refer Fig. 22). Nailsmust be hammer driven flush with thesheet surface. Do not fix closer than12mm to the sheet edge or 50mm tothe corner of the sheet. Do notoverdrive the nails below the sheetsurface as this can weaken the nails’holding.

Fig. 17 SILL FLASHING DETAIL

Aluminiumwindowsection

Building paper

Harditex™

Aluminiumsill flashing

Windowsill

Fig. 18 SILL FLASHING UPSTAND

Lap Inseal 3109or sealant over

flashing upstand

Harditex™

sheet

Cut and fold sillflashing to formsealed upstand

Aluminium sillflashing

Window sill

Window frame

Building paper

150m

mup

stan

d

It is very important to use the correct

drill gun with 316 stainless steel

screws. For the best results, use the low

speed Hitachi model WF4DY. This

model delivers high torque with a slow

speed vibrating action which is very

suitable for stainless steel screws because

it minimises damage to the drill

bit and screw head.

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Notes:1. The gap under the Harditex™ can be sealed off with an H5 treated timber or concrete surround

cast into the ground between the piles.2. Provide adequate sub-floor ventilation as required by NZS 3604.

Fig. 21 BASE DETAIL FOR HARDITEX™ ON TIMBER PILE

Timber frame Building paper

25mm min.

Harditex™ sheet

Finished paving or unpaved ground level

Texture coating

H5treated

pile 50mm min.

Bearer

Particle board stopped10mm back fromHarditex™ sheet

Boundary joist

Floor joist

Sealing strip(refer Note 1).

Fig. 22 STANDARD VERTICAL SHEET FIXING

50mm min. at corners

Stud centres

150mmmax. Fix at

noglines

Max

imum

nog

spa

cing

600mm 600mm

50mm

12mmmin.

1200

mm

1200

mm

Fixing at 150mm centresto all framing

Edg

e di

stan

ce

Minimum45mm-wide

studs atsheet joints

Section 4: Control, expansion and corner joints

Control jointsControl joints are provided to take upthe minimal movement when sheetsare flush jointed together.

Vertical and horizontal control jointsmust be provided to limit themonolithic cladding area.

Vertical and horizontal control jointsmust be provided at 5.4 metremaximum centres.

Horizontal control joints must beprovided at the inter-storey floor joistlevel (refer page 8).

Provide a maximum 6mm gapbetween the sheets.

Control joints must be located at 5.4metre centres from corners.When anopening is in the vicinity of a controljoint then the edge of the opening isan ideal location for it.A goodlocation for control joints is behinddownpipes.

For details of alternative verticalcontrol joints refer Figs 23 and 24.

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Fig. 23 VERTICAL BUTYNOL INSEAL CONTROL JOINT(ALTERNATIVE 1)

Notes:1. Butynol Inseal Strip is available in 12-metre rolls from James Hardie stockists.2. This alternative can be left open to give an expressed joint appearance.3. The finish coating must be sprayed into the joint to give a complete seal to the Butynol and

the sheet edges.4. The sheet edge is to be site cut to give a square edge as shown above and in Fig. 24. Refer

also to the site-cutting recommendations on page 6. The frame set-out and joint positioningin the wall will need to allow for this reduced sheet width.

Pre-formed strip of50mm x 1mm Butynoland 6mm x 10mmInseal 3109

6mm control gap

12mm

Harditex™ coating

Square-edgesheet site cut(refer notes)Timber stud

Harditex™ base sheet

45mm studs min.

Fig. 24 VERTICAL SEALANT CONTROL JOINT(ALTERNATIVE 2)

Notes:1. Mask out the sheet both sides of the joint to apply the flexible sealant.2. Use only a top-quality paintable flexible silicone sealant.3. The finish coating must be stopped each side of the flexible sealant to avoid rippling of the

textured surface.4. In some cases the sealant can colour-match the finish coating; check with the sealant

manufacturer.5. Joint preparation and priming must be carried out according to the sealant manufacturer’s

instructions.6. Joint sealant must be checked for compatibility with the coating applicator.7. When the coating is carried over the sealant joint, long-term coating rippling can occur.

50mm wide x 1.5mmthick strip of Inseal3259

6mm control gap

12mm

Harditex™ coating

Square-edge sheet sitecut (refer notes Fig. 23)

Timber stud

Harditex™ base sheet

Flexible sealant

45mm studs min.

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For details of alternative horizontalcontrol joints refer Figs 25, 26 and 27.

Expansion jointsExpansion joints are provided topanelise elements to allow for long-term frame movement that occursbecause of component shrinkage andtemperature-related expansion andcontraction.

Vertical structural expansion jointsmust be provided where walls exceed14.4 metres in length.These expansionjoints must be correctly designedstructural joints.They must have totalframing, including top and bottomplate, lining and cladding separation toallow for the structural framingexpansion and contraction that canoccur.

Fig. 27 HORIZONTALOVERLAP CONTROLJOINT DETAIL(ALTERNATIVE 3)

Timber stud Harditex™

basesheet

Harditex™

coating

Inseal 3109foam sealingstrip 6mmwide x10mm thick

40-50mm

10m

m

2-3mmoffset

Floorjoist

Notes:1. The horizontal jointer

must be tacked intoplace before the topsheet is installed.

2. Apply sealant to theends of the PVC jointerto stop waterpenetration.

Fig. 25 HORIZONTAL FLASHING CONTROL JOINT(ALTERNATIVE 1)

Timber stud

Horizontal PVC control joint flashing(refer Table 1, page 3)

Floor joist

Top plate

Harditex™ base sheetfixed to bottom plate,floating on joist

Harditex™ coating

3mm gap

Flooring

Bottom plate

6mm gap

Harditex™ basesheet fixed to topplate, floating onjoist

Fig. 26 HORIZONTAL REVEAL CONTROL JOINT(ALTERNATIVE 2)

Notes:1. Dimensions of

polystyrene reveal to beto the specifier’s choice

2. For methods of adheringand finishing thepolystyrene shape referto the selected jointingand coatingmanufacturer.

3. Apply sealant to theends of the PVC jointerto stop waterpenetration.

Timber stud

Floor joist

Top plate

Harditex™ base sheetfixed to bottom plate,floating on joist

Harditex™ coating

3mm gap

Flooring

Bottom plate

6mm gap

Harditex™ basesheet fixed to topplate, floating onjoist

Polystyrene revealfeatured asrequired

Notch polystyreneover jointer

Adhere polystyreneto jointer

HorizontalPVC jointer(refer Table1, page 3)

A well designed long wall willtherefore have full expansion joints at14.4 metre maximum centres withintermediate control joints at 5.4metre centres maximum from anexpansion joint. (Refer Fig. 28.)

Note that for minimum sheet cutting,control joints can be placed at 4.8metre centres between expansionjoints at 14.4 metre centres.

NOTE: These expansion joints must beused on commercial and industrialapplications where long wall lengths arefrequently required.This can be achieved bypanellising the Harditex supportframework off the main structural frame.These details are difficult to achieve ondomestic construction therefore walls greaterthan 14.4 metres must be avoided.

For details of alternative verticalexpansion joints refer Figs 29 and 30.

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Fig. 28 PANELLISED TIMBER FRAME OVER STEEL PORTALS –EXPANSION JOINT LOCATIONS

Primary steel,timber orconcreteframe

14.4 metre maximum expansion joint centres

She

et le

ngthControl joints (refer

Figs 23 or 24)

Expansionjoint (refer Figs29 or 30)

Sheet jointSecondary timber frameto support Harditex™

studs at 600mm centres,nogs at 1200mm centres

Wal

l hei

ght t

o su

it m

ax. 5

400

mm

with

out h

oriz

onta

l con

trol

join

ts

4.8 metre centres to suit expansion joint locations Expansionjoint (refer Figs29 or 30)

Fig. 30 VERTICAL SEALANTEXPANSION JOINT(ALTERNATIVE 2)

6mm expansionjoint gap

Square-edge sheetsite cut(refer notesFig. 23)

12mm

Doublestuds

6mm structural break

50mm wide1.5m thickstrip of Inseal3259

Harditex™

coating

Flexiblesealant

Harditex™

basesheet

Note: Refer to Fig. 24 for general notesrelating to this as the details are the sameexcept for the double studs.

Note: Refer to Fig. 23 for general notesrelating to this as the details are the sameexcept for the double studs.

Fig. 29 VERTICAL BUTYNOLINSEAL EXPANSIONJOINT(ALTERNATIVE 1)

6mm expansionjoint gap

Square-edgesheet site cut(refer notesFig. 23)

12mm

Doublestuds

6mm structural break

Pre-formedstrip of 50mmx 1mmButynol and6mm x 10mmInseal 3109

Harditex™

coating

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Base sheet jointing detailsThe recessed-edge sheet joint isformed between each edge of theHarditex sheet for both vertical andhorizontal joints (refer Fig. 31) and atinternal and external corners.

The jointed panel must be limited insize by the use of vertical andhorizontal control and expansionjoints.

Corner jointsExternal and internal corners have thejointing and coating continuous aroundthe corner or are reinforced with aperforated corner angle (refer Fig. 33).Expressed external and internal cornerscan be used. Details are similar to thoseshown in Figs 23 and 24.

For external corners refer to Figs 32and 33.

At internal corners adhere a strip ofInseal 3259 in position before fixingsheets. (Refer Fig. 34.) The sheets canthen be finished with the standardtape-reinforced flexible jointingsystem. (Refer Figs 31 and 34.)

Corner details can also be expressed orsealant filled similar to the detailsshown in Figs 23 and 24. Refer to thenotes in Figs 23 and 24.

Notes:1. The recessed edge of the Harditex™ sheet is designed to accommodate a tape-reinforced

flexible jointing system, to achieve a flush finish with textured coatings. Refer also to theselected coating contractor for joint details.

2. When the sheet recessed edge is cut away, site grinding of the edge to form a recessed jointis required before the sheet is fixed. (Refer Fig. 7.)

Fig. 31 RECESSED-EDGE SHEET JOINT DETAIL

12mm

1-2mm gap

Building paper

Recessed sheetedges for sitejointing

Timber stud

45mm stud min.

Recessed sheet joint methodThe following external corner details must have recessed edges and can be finished by thefollowing methods.• The external corner can be jointed with flushing and finishing compounds and reinforcing tape

continuous around the corner as described in Fig. 31.• The external corner can be tied together with an exterior-quality PVC angle fitted over the

recessed edges of the Harditex™. Nail-fix to frame. Nail both legs of the angle with 40mmHardiflex® nails at 255mm centres. The corner must then be finished with flushing and beddingcompound over the angle. Refer Fig. 33 for finishing detail. The PVC angle is available fromstockists of James Hardie products.

Square sheet edge method• Open joint or sealant joint (refer notes page 15)• The joints are finished similar to Figs 23 and 24, except use 80mm-wide Butynol Inseal or

Inseal 3259 to allow for the corner joint.

Fig. 32 RECESSED-EDGE EXTERNAL CORNER DETAIL

Timber framing

Building paper

Recessed sheetedges ready forsite jointing

1-2mm gap

Harditex™ sheet

Hardiflex® nails

Before fixing external corner angle inposition fill any gaps between Harditex™

base sheets with flexible sealant

Fig. 33 PVC CORNERFINISHING

PVC angle

Notes:1. The internal corners can be jointed with

flushing and finishing compounds andreinforcing tape continued around thecorner as described in Fig. 31.

2. Square sheet edge methods with openjoint or sealant joint can also be used(refer Figs 23 and 24).

Fig. 34 RECESSED-EDGEINTERNAL CORNERDETAIL

80mm wide x1.5mm thickstrip of Inseal3259

Timber framingBuildingpaper

Recessed sheet edges ready for site jointing

1-2mmgap

Harditex™

sheet

Hardiflex®

nails

Section 5: Bracing systems

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HT1 1200 or more Not required Refer Figs 35 and 36 100 90Holding down (HD) boltsto concrete floor

HT2 900 - 1200 Required Refer Figs 37 and 38 100 100HT3 1200 or more (refer Figs 115 100

42 or 46) HD bolts to concrete floor

HT4 1200 - 2400 Not required Refer Fig. 39 130 110HT5 2400 or more 130 120

HT6 900 - 1200 Not required Refer Figs 40 and 41 100 80HT7 1200 - 2400 HD bolts to concrete floor 115 90HT8 2400 or more 120 100

HT9 600 Required Refer Fig. 43 93 98(refer Fig. 42)

HT10 600 Required Refer Figs 44 and 45(refer Figs HD bolts to concrete floor 93 9847 and 48) Coach bolts to timber floor

HT 11B 900 or more Not required Refer Fig. 50A and 50BUse coach screw to joists 191 168Winstones Gib® Bracelineon inside faceHarditex on outside face

HT12B 900 or more Not required Refer Fig. 51A and 51BHD bolts to concrete floor 191 168Gib® Braceline on inside faceHarditex on outside face

HT13B 2400 or more Not required Refer Fig. 52A and 52BGib® Braceline on inside face 190 162Harditex on outside face

HT14B 2400 or more Not required Refer Fig. 53A and 53BHD bolts to concrete floor 190 162Gib® Braceline on inside faceHarditex on outside face

HT15B 3200 or more Not required Refer Figs 54A, 54B, 55 and 56(window panel) HD bolts/coach screws to floor 75 63

Gib® Braceline on inside faceHarditex on outside face

HT16B 3200 or more Not required Refer Figs 54B, 54C, 55 and 56(window panel) Gib® Braceline on inside face 75 63

Harditex on outside face

HT 17GB 2400 or more Not required Refer Fig. 52A and 52C 190 1149.5mm Gib® Standard oninside faceHarditex on outside face

Table 4: Bracing ratings for 7.5mm or 9mm Harditex

System Bracing End Bracing details NZS 3604:1990number element straps rating in bracing units

length (mm) per metre of element length

Wind Earthquake

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This specification is used to install anddetermine the bracing ratings ofHarditex 7.5mm and 9mm externalwall bracing and claddings. Bracingratings have all been determined byBRANZ testing and are suitable foruse in conjunction with NZS 3604Code of Practice for Light TimberFrame Construction Not RequiringSpecific Design.

FramingThe Harditex bracing systems in thisbrochure apply only to timber frameconstruction, and are not to be usedfor steel frame construction.

The timber framing must be inaccordance with NZS 3604 Code ofPractice for Light Timber FrameBuildings.

The studs must be spaced at 600mmmaximum centres, between continuoustop and bottom plates with nogs at1200mm maximum centres.

FixingHarditex bracing sheets must be fixedvertically with all sheet edges onframing. Sheet joints must be avoidedat the corners of openings (except forexpansion and control joints). Refer topages 15-17 for full details of controland expansion joints.

When bracing panels contain controland expansion joints the panels mustbe separated, for design purposes, intoseparate units each side of the joints.

To achieve the bracing ratings shownin Table 4, full-height sheets withoutjoints must be used for walls up to3000mm in height.When bracingwalls exceed 3000mm in height, onesheet joint is permissible up to amaximum bracing element height of4800mm. Jointing sheets in thehorizontal direction is permissible tomake up the element length. Jointingmust be kept to the minimum, forexample an 1800mm element length

must be a 1200mm- and 600mm-widesheet or two 900mm-wide sheets.

Always ensure the sheet join is on thecentre line of the stud or nog toachieve the fixing as detailed.

There is no limit to the length ofbracing elements.

When end fixing straps are used, thestrap and the holding-downbolt/coach screw must be used at theend of each element length.When justHD bolts/coach screws are used theyare required at the end of eachelement length.

When group nailing is used it must beat the end of each bracing sheet.WhenHD bolts or coach screws are requiredwith group nailing, they must be atthe end of each sheet as shown in therelevant figure.

Fix all Harditex sheets to timberframing with 40 x 2.8mm 316

Notes:1. End strap fixing between studs

and joists is not required for this system.2. For internal walls System HT1 can have the

sheet stopped at the underside of the bottomplate and achieve the same ratings given inTable 4.

Fig. 35 HARDITEX™ TO TIMBER JOISTS WITHOUT END STRAPS(System HT1) 50mm

Harditex™ bracing sheet

Timber framing

Hardiflex®nail fixings

Bottom plate

Flooring

Joist or boundary joist50mm

Fixings a

t 150mm ce

ntres

Bracing element le

ngth

50mm

Fix

ings

at 1

50m

m c

entr

es to

all

stud

s

Bra

cing

she

et h

eigh

t

50mm

50mm from corners

Fixings at 150mm centres

to top plate

150mm

stainless-steel Hardiflex nails. Nail at150mm centres (or as specified in thediagrams) to sheet edges and tointermediate framing and nogs.

Nails must be driven a minimum of12mm from the sheet edge and 50mmfrom corners.The sheets must be heldhard against the framing during nailingto minimise nail break-out.

Drive all nails flush with theHarditex sheet surface. Do not punchas this can weaken the nails’ holding.

Fix all Harditex sheets from thecentre working towards the outside toavoid drumminess.

Certain bracing applications requirethe use of end strap fixing.The endstraps must be rebated into the framingbehind the sheets. (Refer Table 4 andFigs 42, 46, 47 and 48.)

BracingHarditex will provide bracing forbuildings designed and constructed inaccordance with NZS 3604 (NZS3604 is cited in Approved DocumentBI/AS1 Clause 4.0.)

For verification of this aspect of theproduct refer to BRANZ AppraisalCertificate No. 229, 1995 (JamesHardie Wall Bracing Systems).

Harditex when used as the requiredbracing must also be used with theappropriate fixings as set out in Table4. Refer also to Figs 35 to 56 forHarditex sheet bracing details.

Sheets stopped below top plateWhere bracing sheets are stoppedbelow the level of the top plate referto Fig. 49 for details.

Bracing panel heightBracing panel height is normally

2400mm and all bracing ratings givenin Table 4 are for this panel height.

When other heights are required referto Clause K.7 NZS 3604.Themaximum height for all these bracingpanels is 4800mm.

General notes for all bracingfigures1. Where boundary joists are required

they must be continuous membersnailed to the ends of joists and mustnot be nogged between.

2. For the Harditex or Harditex /Gib® Braceline ratings for all figuresrefer to Table 4.

3. Where holding down bolts arerequired the HD bolts must beM12 hot-dipped galvanised with 50x 50 x 3mm galvanised washers. Fixas shown in Fig. 4.17 NZS 3604.

4. All nail fixings to bracing panelsmust be 316 stainless steel to meetthe 50-year durability requirements.

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Notes:1. End strap fixing to studs is not required for

this system.2. Sheet can finish flush with underside of the

bottom plate for internal timber and concretefloors. For external walls to concrete floors a50mm weathering overhang must be provided.

3. This system can also be used for externalboundary joists with the one row of bottomfixings at 150mm centres. The sheet mustthen overhang the bottom of the joist by 50mmfor weathering.

Fig. 36 HARDITEX™ TO TIMBER OR CONCRETE FLOORS WITHOUT END STRAPS(System HT1) 50mm


Timber framing


Bottom plate

HD bolts required toconcrete floor only (refergeneral note 3, page 21)

Concrete or timber floor

50mm

Fixings a

t 150mm ce

ntres

Bracing element le

ngth

50mm

Fix

ings

at 1

50m

m c

entr

es to

all

stud

s

Bra

cing

she

et h

eigh

t

50mm

50mm from corners


to top plate

150mm

50mm overhangminimum for external

concrete floor

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Note: Galvanised-steel end fixing straps to beas detailed in Fig. 42.

Fig. 37 HARDITEX™ TO TIMBER JOISTS WITH END STRAPS(Systems HT2, HT3)

50mm


Timber framing


Bottom plate

Flooring

50mm

Fixings a

t 150mm ce

ntres

Bracing element le

ngth

50mm

Fix

ings

at 1

50m

m c

entr

es to

all

stud

s

Bra

cing

she

et h

eigh

t

50mm

50mm from corners


to top plate

End strap fixing (refer Fig. 42)

End strap fixing(refer Fig. 42)

150mm

Joist or boundary joist

Notes:1. Galvanised-steel end fixing straps must be

used as detailed in Fig. 42 for timber floorsand Fig. 46 for concrete floors.

2. Sheet can finish flush with underside of thebottom plate for internal timber and concretefloors. For external walls to concrete floors a50mm weathering overhang must be provided.

50mm


Timber framing

End fixing straps (refer Note 1)

Bottom plate

Concrete or timber floor

50mm

Fixings a

t 150mm ce

ntres

Bracing element le

ngth

50mm

Fix

ings

at 1

50m

m c

entr

es to

all

stud

s

Bra

cing

she

et h

eigh

t

50mm

50mm from corners


to top plate

150mm

HD bolts to concrete floor only(refer general note 3, page 21)

150mm

150mm

Fig. 38 HARDITEX™ ON TIMBER OR CONCRETE FLOORS WITH END STRAPS(Systems HT2, HT3)

50mm overhangminimum for external

concrete floor

BR

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Notes:1. End strap fixing between studs and joists is

not required for these systems.2. When the Harditex™ bracing panel is more

than one sheet wide the 8-nail pattern (groupnails) is required to end of each sheet length.

Fig. 39 HARDITEX™ GROUP NAIL FIXING TO TIMBER JOISTS(Systems HT4, HT5)

50mm


Timber framing

Hardiflex®

nail fixings

Bottom plate

Flooring

50mm

Fixings a

t

150mm centre

s

Bracing element le

ngth

50mm

Fix

ings

at 1

50m

m c

entr

es to

all

stud

s

Bra

cing

she

et h

eigh

t

50mm

50mm from corners

Fixings at 100mm

centres to top plate

150mm


5050 505050

505050

Group 8-nailpattern holding

down

Notes:1. End strap fixing between stud and bottom

plate is not required for this system.2. When the Harditex™ bracing panel is more

than one sheet wide the 11-nail pattern (groupnails) and the HD bolts are required to end ofeach sheet length.

Fig. 40 HARDITEX™ GROUP NAIL FIXING FOR CONCRETE FLOORS(Systems HT6, HT7, HT8)

A

50mm


Timber framing

Bottom plate

Concrete floor

50mm

Fixings a

t 150mm ce

ntres

Bracing element le

ngth

50mm

Fix

ings

at 1

50m

m c

entr

es to

all

stud

s

Bra

cing

she

et h

eigh

t

50mm

50mm from corners

Fixings at 100mm


150mm

HD bolts (refer general note 3, page 21)

150mm

150mm

Section A-A (refer Fig. 41)

11 at

25mm

11 at

25mm

A


down

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Notes:1. The strap must be 25mm x 1mm galvanised steel capable of carrying a tension force of 6KN

(capacity load as defined in NZS 3604)2. Strap nails must be 40 x 2.8mm diameter hot-dipped galvanised.

Fig. 42 END FIXING STRAP TO TIMBER FLOOR JOISTS

Six nails to stud


End fixing strap

Strap to be recessedinto timber framing

Boundary joist

Flooring

Six nails to joist

Note: The 50mm sheet overhang is essential for this detail to develop the nail holding.

Fig. 41 SECTION A-A

Bottom plate

Concrete edgefloor thickening

Harditex™ bracing sheets

Bra

cing

shee

t hei

ght

50m

mm

in.

6mm min. gapas required byNZS 3604

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Note: Galvanised-steel fixing straps must be asdetailed in Fig. 42.

Fig. 43 600MM-WIDE HARDITEX™ TO TIMBER FLOOR – BOUNDARY JOISTS(System HT9)

600mm


Timber framing


Flooring

Boundary joist

50mm sheet overhang

50mm

Fix

ings

at 1

50m

m c

entr

es to

all

stud

s

Bra

cing

she

et h

eigh

t

50mm

150mm

Bracing element length

100mmfixing centres

50mm

50m

m

12mmedge

distance

75mm

25m

m

Refer Fig. 42

100mm

100mm fixing centres

100mmfixing

centres 50mm

100mm

Notes:1. Galvanised-steel end fixing straps must be as detailed in Figs 47 and 48.2. The dummy studs are nailed to the main studs with 3 horizontal 90 x 3.75 nails per dummy stud, and the dummy nogs nailed with two 90 x 3.75

nails to the dummy studs and the dummy bottom plate nailed to the bottom plate with two 90 x 3.75 nails between the coach bolts.3. The sheet must overlap the concrete floor by 50mm when weathering overlap is required on an external wall. (Refer Fig. 41.)

Fig. 44 600MM-WIDE HARDITEX ™ TO CONCRETE FLOOR(System HT10)

600mm

Harditex™ sheetTimber framing


Ex 100mm x 50mm dummystuds, nogs and bottom plate.Fix with 90 x 3.75mm nailsin the positions shown. Referalso Note 2

Fix

ings

at 1

50m

m c

entr

es to

all s

tuds

and

dum

my

stud

s

Bra

cing

she

et h

eigh

t

50mm

M12 HD bolt each side(refer general note 3,page 21)

Bracing element length100mmfixing

centres

800m

m ReferFigs 47and 48

12mm edgedistance

50mm

ReferFigs 47and 48

Top concrete floor50mm

50mm

50mm

50mm

12mm100mmfixing

centres

50mm 50mm

100mm 100mm


Sheet can finishat underside ofbottom plate

50mm

Sheet-fixing elevationFrame-fixing and holding-down elevation

BR

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Notes:1. Galvanised-steel end fixing straps must be as detailed in Figs 47 and 48.2. The dummy studs are nailed to the main studs with 3 horizontal 90 x 3.75 nails per dummy stud, and the dummy nogs nailed with two 90 x 3.75

nails to the dummy studs and the dummy bottom plate nailed to the bottom plate with two 90 x 3.75 nails between the coach bolts.3. When external weathering is required the sheet must overlap the bottom of the timber by 50mm.

Fig. 45 600MM-WIDE HARDITEX™ TO TIMBER FLOOR(System HT10)

600mm

Harditex™ sheetTimber framing


Ex 100mm x 50mm dummystuds, nogs and bottom plate.Fix with 90 x 3.75mm nailsin the positions shown. Referalso Note 2

Fix

ings

at 1

50m

m c

entr

es to

all s

tuds

and

dum

my

stud

s

Bra

cing

she

et h

eigh

t

50mm

M12 coach screw eachside (refer Fig. 48)

Bracing element length100mmfixing

centres

800m

m ReferFigs 47and 48

12mm edgedistance

50mm

ReferFigs 47and 48

Timber floor

50mm

50mm

50mm

50mm

12mm100mmfixing

centres

50mm 50mm

100mm 100mm


Sheet can finishat underside ofbottom plate

50mm

Sheet-fixing elevationFrame-fixing and holding-down elevation

Notes:1. The 2 straps combined must be capable of carrying a tension force of 6KN (capacity load as defined in NZS 3604). This is achieved by a 25mm

x 1mm strap each side, each of 3KN capacity. (3 nails each end of a 25mm x 1mm strap give 3KN capacity and 6 nails each end of strap give6KN capacity.)

2. Strap nails must be 40 x 2.8mm diameter hot-dipped galvanised flat-heads.

Fig. 46 END FIXING STRAP TO BOTTOM PLATE ON CONCRETE FLOOR

Harditex™

sheet

Strapsrequired each

side of stud

Strap to berecessed into

timber framing

Thickened edgeof concrete floor

Three nails tobottom plateeach side

Three nailseach sideof stud

Carry sheet 50mm pastbottom plate for externalweathering detail

BR

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Fig. 48 SECTION B-B

60mm

Four 40 x 2.8nails tobottom plate

For timber floor: 12mm diam. coach screwhot-dipped galvanised to penetrate 120mminto floor and joists. 50mm x 50mm x 3mmgalvanised washer.

For concrete floor: HD bolts must be M12hot-dipped galvanised with 50mm x 50mmx 3mm galvanised washers. Fix as shownin Fig. 4.17 NZS 3604.

Concrete ortimber floor

140m

m

Harditex™ sheet

Fig. 47 END FIXING STRAP DETAIL FOR CONCRETE ANDTIMBER FLOORS – 600MM-WIDE PANEL

Dummy studSix 40mm x2.8mm

galvanisednails to stud

Two 40 x2.8 nails to

plate25mm x 1mmgalvanised-steel strap x200mm longbent underbottom plate

Dummybottom plate

Stud

B

B

Section B-B (refer Fig. 48)

Notes:1. All sheet nailing must be as shown for the various bracing systems.2. The full bracing values for full-height sheets for each system can be used when this detail is followed.3. This detail must be used instead of the detail shown in Fig. K1 NZS 3604

Fig. 49 DETAIL WHEN BRACING SHEET STOPPED BELOW TOP PLATE

Two 100 x 4mmend nails to

each nog

Extra nogs tobe same sizeas studs and

plates

Bracingsheet

Extra nog undertop plate

Three 100 x 4mmnails to each nog

300mmmax.

Sheetnailing as fortop plate

Studs

Overall bracing height canvary (refer to informationon page 21)

BR

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AHARDITEX™ FIXING DETAILS


not required for these systems. Use coachscrews as detailed.

2. When the Harditex™/Gib® Braceline panel ismore than one sheet wide the eight-nailpattern (group nailing) and the coach screwsare required to end of each sheet length.

BGIB® BRACELINE FIXING DETAILS

Notes:1. All Gib® Braceline sheets to be fixed to Winstone

Wallboards specifications, Gib® Bracing SystemNov 1994.

2. All Gib® Braceline sheets to be stopped toWinstone Wallboards specifications, Gib®

Stopping and Finishing Systems Nov 1992.

Fig. 50 HARDITEX™/GIB® BRACELINE GROUP NAILING DETAIL TO TIMBER JOISTS(Systems HT11B)

50mm


Timber framing

Hardiflex®nails

Bottom plate

Flooring

50mm

Fixings a

t

150mm centre

s

50mm

Fix

ings

at 1

50m

m c

entr

es to

all

stud

s

Bra

cing

she

et h

eigh

t

50mm

50mm from corners

Fixings at 100mm


150mm


5050

505050

505050

Double bottom plate

100mm

Bracing element le

ngth

75mm

Nog at mid-height

Timber framing

Bottom plate

Flooring

50mm

Fixings a

t

100mm centre

s

Fix

ings

at 1

50m

m c

entr

es

Bra

cing

she

et h

eigh

t

Pairs of 30mm x 2.5mmGib® Clouts only at300mm centres to

centre studs

Bracing element 900mm or more

50mm


30mm x 2.5mm Gib®

Clouts and washer toperimeter of sheetand nogs

12mm

75mm

Fixings a

t

100mm centre

s

12mm

50mm

50mm

Gib® Braceline sheet

Six 90 x 3.75mm nails to fixdouble bottom plate, threebetween each stud

12mm coach screws topenetrate 120mm intofloor and joists. 50mmx 50mm x 3mmgalvanised washer

100mm

100mm

Fixings at

150mm centres


down

BR

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not required for these systems. Use HD boltsas detailed.

2. When the Harditex™/Gib® Braceline panel ismore than one sheet wide the 11-nail pattern(group nailing) and the HD bolts are requiredto end of each sheet length.




2. All Gib® Braceline sheets to be stopped to WinstoneWallboards specifications, Gib® Stopping andFinishing Systems Nov 1992.

Fig. 51 HARDITEX™/GIB® BRACELINE GROUP NAILING DETAIL ON CONCRETE FLOOR(System HT12B)

50mm


Timber framing

Hardiflex® nails

Bottom plate

Section A-A(refer Fig. 41)

50mm

Fixings a

t 150mm ce

ntres

50mm

Fix

ings

at 1

50m

m c

entr

es to

all

stud

s

Bra

cing

she

et h

eigh

t

50mm

50mm from corners

Fixings at 100mm


50mm

Double bottom plate

100mm

Bracing element le

ngth

75mm

Nog at mid-height

Timber framing

Bottom plate

Concrete floor

50mm

Fixings a

t

100mm centre

s

Fix

ings

at 1

50m

m c

entr

es

Bra

cing

she

et h

eigh

t


centre studs

Bracing element 900mm or more

50mm

30mm x 2.5mm Gib®

Clouts and washer toperimeter of each sheetand nogs

12mmedge

distance

75mm

Fixings a

t

100mm centre

s

12mm

50mm

50mm


Six 90 x 3.75mm nails to fixdouble bottom plate, 3between each stud

HD bolts (refer generalnote 3, page 21)

100mm

100mm

Fixings at

150mm centres

50mm 50mm

A

A

11 at

25mm

11 at

25mm

Concrete floor

50mm


down

BR

AC

IN

G

SY

ST

EM

S



B GIB® BRACELINE FIXING DETAILS FOR HT13BNotes:1. All Gib® Braceline and Gib® Standard sheets to be fixed to Winstone Wallboards

specifications, Gib® Bracing System Nov 1994.2. All Gib® Braceline and Gib® Standard sheets to be stopped to Winstone Wallboards

specifications, and Gib® Standard Stopping and Finishing Systems Nov 1992.

A HARDITEX™ FIXING DETAILSNotes:1. End strap fixing between studs and joists is

not required for these systems.2. When the Harditex™/Gib® Braceline or

Harditex™/Gib® Standard panel is more than2400mm wide the 8-nail pattern (groupnailing) is required at the end of each2400mm element.

Fig. 52 HARDITEX™/GIB® BRACELINE GROUP NAILING DETAIL TO TIMBER JOISTS (System HT13B)HARDITEX™/GIB® STANDARD GROUP NAILING DETAIL TO TIMBER JOISTS (System HT17GB)

50mm

Harditex™

bracing sheet

Timberstuds at600mmcentres

Bottom plate

Flooring

Fixings a

t 150mm ce

ntres

50mm

Fix

ings

at 1

50m

m c

entr

es to

all

stud

s

Bra

cing

she

et h

eigh

t50mm

50mm fromcorners

Fixings at 100mm centres to top plate

150mm

Joist orboundary joist

7050

505050

505050

100mm

Hardiflex®nails

50mm

Bracing element le

ngth

75mm

Nog atmid-height

Timberframing

Bottomplate

Flooring

Fix

ings

at 1

50m

m c

entr

es

Bra

cing

she

et h

eigh

t

Pairs of 30mm x 2.5mmGib® Clouts only at300mm centres tocentre studs

Bracing element length 2400mm or more

Floor joist

30mm x 2.5mm Gib® Cloutsand washer to perimeter ofsheet and nogs

12mm

75mm

Fixings a

t 150mm ce

ntres

12mm

Gib® Bracelinesheet

75mm


75mm

Bracing element length 2400mm or more

Gib fixings at 150mm centres

75mm

75mm

Bracing element le

ngth

C GIB® STANDARD FIXINGDETAILS FOR HT17GB

Group 8-nailpattern holdingdown

single nail

30 x 2.5mmGib® Cloutsat 150mmcentres toall framing

Stop sheet atbottom plate.Group nailsnot required

9.5mm Gib® Standard

BR

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not required for these systems.2. When the Harditex™/Gib® Braceline panel is

more than 2400mm wide the 11-nail pattern(group nailing) and the HD bolts are requiredat the end of each 2400mm element length.




2. All Gib® Braceline sheets to be stopped toWinstone Wallboards specifications, Gib®

Stopping and Finishing Systems Nov 1992.

Fig. 53 HARDITEX™/GIB® BRACELINE GROUP NAILING DETAIL ON CONCRETE FLOOR(System HT14B)

50mm

Harditex™

bracing sheet

Timberstuds at600mmcentres

Bottom plate

Concrete floor

Fixings a

t 150mm ce

ntres

50mm

Fix

ings

at 1

50m

m c

entr

es to

all

stud

s

Bra

cing

she

et h

eigh

t

50mm

50mm fromcorners

Fixings at 100mm centres to top plate

150mm

HD bolts (refer generalnote 3, page 21)

100mm

75mm

Nog at mid-height

Timber framing

Bottom plate

Fix

ings

at 1

50m

m c

entr

es

Bra

cing

she

et h

eigh

t


centre studsBracing element length 2400mm or more

Concrete floor

30mm x 2.5mmGib® Clouts andwasher to perimeterof sheet and nogs

12mm

75mm

Fixings a

t 150mm ce

ntres

12mm

Gib® Bracelinesheet

75mm


75mm

50mm

Bracing element le

ngth

150mm Section A-A(refer Fig. 41)

Section A-A(refer Fig. 41)

A

A

11 at

25mm

11 at

25mm

150mm

Group 11-nailpattern holdingdown

BR

AC

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Fig. 54 HARDITEX™/GIB® BRACELINE WINDOW OPENING PANEL

AHARDITEX™ FIXING DETAILS TO TIMBER OR CONCRETE FLOOR DOUBLE BOTTOM PLATE(System HT15B)

CHARDITEX™ FIXING DETAILS TO TIMBER FLOOR BOUNDARY JOISTS (System HT16B)

BGIB®BRACELINE FIXING DETAILS (Systems HT15B, HT16B)


Bracing element length 3200mm

Double bottom plateConcreteor timber

floor

2400

mm

min

. (re

fer

Not

e 5)

Refer Note 1

Top plate

150mm typical

HD bolts (refer Notes 1 and 2)

300mmmax.

50mm

150mm

800mm1600mm

800mm combineddimension (refer Note 8)

40mm x 2.8mm Hardiflex®

nails at 150mm centres

100mm

100mm

Timber framing

Fixings at100mm centres

50mm

100mm


50mm

100mm

150mm

12mm

50mm

1500

mm

Fixingsto nogs

Max.

window opening

1600mm x 1500mm

Fixings at 100mmcentres to return wall

Pairs of 30mm x 2.5mm Gib®

Clouts only at 300mm centresto centre studs

30mm x 2.5mm Gib®

Clouts and washerat 150mm centres toperimeter of sheetand window opening

Bra

cing

she

et h

eigh

t

150mmtypical

800mm

1600mm


Fixings at 150mm centresto all sheet perimeters

Max.

window opening

1600mm x 1500mm

12mmtypical

Bottom ofbottom plate

Fix

ings

at 1

50m

m c

entr

es

to a

ll sh

eet p

erim

eter

sTop oftop plate

600m

m15

00m

m30

0mm


Bracing element length 3200mm

Boundary joist andbottom plate

50mm sheetoverhang

Top plate

150mm typical

300mmmax.

50mm

800mm1600mm


40mm x 2.8mm Hardiflex®

nails at 150mm centres

100mmFixings at100mm centres

50mm

100mm


50mm

100mm

12mm

1500

mm

Fixingsto nogs

Max.

window opening

1600mm x 1500mm

Timber framing

Nog to fix sheet

Fixings at 100mmcentres to return wall

2100

mm

50m

m

Lintel

Bottom ofbottom plate


BR

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Fig. 55 HARDITEX™/GIB®BRACELINE WINDOW OPENING PANEL– PANEL WITH TWO WINDOWS

800mm

Bracing element length = 6400mm

Bra

cing

she

et h

eigh

tm

in. 2

400m

m

1600mm

1600mm

1600mm

600

mm

300

mm

1500

mm

800mm combineddimension (referNote 8, Fig 54)

800mm panel each sideof window = 1600mm

Harditex™ to outside faceGib® Braceline to inside face

Notes:1. The full length of this panel can be used for bracing values, e.g. for wind 75BU/metre x length

(refer Table 4) = 75 x 6.4 = 480BU.2. All fixing and framing details for these window panels are as given in Fig. 54.

Window

openingW

indow

opening

Fig. 56 HARDITEX™/GIB® BRACELINE WINDOW OPENING PANEL– PANEL WITH THREE WINDOWS

800mm

Bracing element length = total length less themiddle window opening = 6400mm effective length

Bra

cing

she

et h

eigh

t

min

. 240

0mm

1600mm

1600mm

1600mm

600

mm

300

mm

1500

mm

800mm combineddimension (referNote 8, Fig 54)

The middle window mustbe ignored as eachwindow opening musthave 800mm each side

Harditex™ to outside faceGib® Braceline to inside face

Notes:1. All fixing and framing details for these window panels are as given in Fig. 54.2. The BU for this panel for wind is 75BU/metre (refer Table 4) x length = 75 x 6.4 = 480 BU.

800mm

Window

openingW

indow

openingW

indow

opening

800mm combineddimension (referNote 8, Fig 54

Notes to Fig. 54:1. Double bottom plate fixing, Fig. 54A:

• For concrete floors: HD bolts must beM12 hot-dipped galvanised with 50 x50 x 3mm galvanised washers at600mm centres. Fix as shown in Fig.4.17 NZS 3604.

• For timber floors: Coach screws intodouble bottom plate and floor joists(refer Fig. 48) for details). Bolts mustbe at 600mm centres.

• The double bottom plate fixings arethe HD bolts at 600mm centres. Noother fixings are required.

• The return wall is 400mm minimum;one HD bolt located in the centre ofthe panel is required.

2. Alternative when boundary joists areused and the bracing panel is taken overthe joists. Fix as shown in Fig. 54C.

3. The Gib® Braceline must be fixed asshown in Fig. 54B for systems HT15Band HT16B.

4. Harditex sheet can be stopped a maxi-mum of 300mm below top plate or con-tinued up the top of the top plate asrequired.

5. Gib® Braceline sheets must be full heightbetween bottom and top plate.

6. The minimum height for this bracingpanel is 2400mm. The height can begreater than 2400mm (refer ‘Bracingpanel height’ page 21.)

7. All Gib® Braceline sheets to be stoppedto Winstone Wallboard specifications,Gib Board Stopping and FinishingSystems Nov 1992.

8. Window Panel Combination notes:• The maximum allowable window size

is 1600mm wide x 1500mm deep.Any window this size or smaller canbe used for the bracing calculation.

• The minimum wall panel length toeach side of a window opening mustbe 800mm. This can be either of thefollowing: An in-plane wall 800mm long.An in-plane wall and a return wall togive 800mm combined length.

• The minimum length of the in-planewall or the return wall is to be each400mm.

• The total wall length including thewindow opening and the return wall isused for the bracing calculation.

• The only exception to this is theexample in Fig. 56 where the middlewindow must be ignored as each win-dow opening must have 800mm eachside.

9. The return wall bracing units contributeto the wall at right angles to the in-planewall.

Section 6: New Zealand Building Code compliance

New Zealand Building Code(NZBC)Harditex must be used in accordancewith this specification. It will thenmeet the relevant provisions of NZBCClauses:B1 StructureB2 DurabilityE2 External MoistureF2 Hazardous Building Materials

(Harditex is non-hazardous interms of Clause F2).

It will also contribute towards theprovisions of H1 Energy Efficiencywhen the details in this specificationare used. (Refer Fig. 57.)

DurabilityThe Harditex sheet system meets theperformance requirements of NZBCClause B2.3.1(a) of 50 years as long asthe integrity of the various coatingsystems is maintained.This isparticularly relevant to theperformance of the fixing and jointingsystems and when used as the bracingsystem.

Harditex sheets must be jointed andcoated within 3 months of erection.

In very severe coastal conditions inNew Zealand hot-dipped galvanisednails and screws have a durability of 10years.Therefore in these locationsalternatives such as stainless-steelfixings must be used.

Very severe coastal conditions aredefined as:

• Areas within 500 metres of surfbeaches

• Areas within 200 metres of non-surfbeaches.

NOTES:1. 500 metres is a guide distance only. In

some coastal areas salt spray may driftinland much further than 500 metres,therefore local corrosion hazards and

prevailing on-shore winds must be takeninto consideration.

2. Areas of high thermal activity must alsobe regarded as very severe conditions.

To meet the 50-year bracing durabilityrequirements, stainless-steel nails mustbe used for all bracing sheets. 40mmand 50mm x 2.8mm 316 gradestainless-steel nails area available fromstockists of James Hardie products.

Serviceable lifeHarditex is not susceptible to long-term moisture damage and when thejointing, sealing, flashing and coatingdetails are maintained the Harditex isexpected to have a serviceable life of atleast 50 years.

BRANZ appraisalHarditex has gained the followingBRANZ Appraisal Certificates:

No. 229 (1995) James Hardie WallBracing SystemsNo. 243 (1995) Harditex –

ExteriorSubstrate for Coating Systems

Bracing systemsHarditex 7.5mm and 9mm sheets aresuitable sheet materials for wall bracingin terms of NZS 3604. For full details

of the Harditex bracing systems referto pages 19-33.

MaintenanceRegular maintenance of the variousjointing and coating systems is essentialto ensure water ingress is preventedover the life of the building. Inparticular the following will needcareful attention to maintain awaterproof state:

• PVC flashings and jointers

• Inseal and Butynol strips

• Sealants, coatings and any cracks atjoints.

Regular maintenance is required tomeet the stated durability in the NewZealand Building Code. Maintenancealso has an effect on systemperformance, therefore it must beshown that regular maintenance hasbeen carried out for productwarranties to be upheld.

Maintenance definition• A regular check every 12 months to

confirm there is no deterioration ofany component

• Washdown of the painted surfacesevery 12 months

• Recoating of painted surfaces every7 to 12 years

NE

W

ZE

AL

AN

D

BU

IL

DI

NG

C

OD

E

CO

MP

LI

AN

CE



CONSTRUCTION1. Top plate2. Fibreglass wall insulation batts R1.83. Building paper4. Studs ex (100 x 50) at 600mm centres5. One row nogs (1200mm centres)6. Internal lining (9.5mm gypsum or 6mm

Villaboard®)7. External lining (7.5mm or 9mm Harditex™

8. Bottom plate

Note:The construction shown above will give anR value of 1.77°Cm2/W.

Fig. 57 TIMBER-FRAMED WALL WITH FIBREGLASS BATTS

3

2

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The time cycle will depend on thepaint system used. Check with thepaint manufacturer for the lifeexpectancy of the system.

Energy efficiencyA timber-framed wall clad with7.5mm or 9mm insulated Harditex

(refer Fig. 57) will exceed the1.5ºCm2/W requirement of thermalresistance as cited by AcceptableSolution E3/AS1 and therefore therequirements of NZBC Clause E3should be met in housing if adequateinsulation is provided.

Fire-resistance ratings (loadbearing)Refer to Table 5.

A load-bearing 30/30/30 fire-resistance rating is available (referBRANZ test report 2454).This systemcomprises 7.5 or 9mm Harditex on100 x 50 frame with R1.8 fibreglassbatts and 12.5mm Gib® Fyreline.Contact the James Hardie Helpline on0800 808 868 for further details.

Fire-resistance ratings can be achievedby fixing Harditex sheets to thefollowing specifications:

• Fix Winstone’s Gib® Fyreline instrict accordance with thespecification number shown in theGib® Fire Rated Systems, July1997.

• Batten over the outside layer ofGib® Fyreline at the same framingcentres as for the fire-ratedspecification. Refer also to page 9 ofthis brochure for the batteningspecifications. Refer also toWinstone Wallboards LtdInformation Bulletin No. 13March 1994.

• Place heavy-duty breather-typebuilding paper complying withparagraph E2/AS1 2.5.3 of theNew Zealand Building Code overthe battens.

• Fix the Harditex in accordancewith the instructions in thisbrochure.

A comprehensive list of fire-resistanceratings is available from James Hardie.Phone the James Hardie Helpline:0800 808 868.

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15/15/15 timber GBTL 15 One layer 9.5mm Gib® Standard each side frame15/15/15 steel GBSL 15 One layer 12.5mm Gib® Standard each side frame

30/30/30 timber GBTL 30 One layer 9.5mm Gib® Fyreline each side frame30/30/30 steel GBSL 30a One layer 16mm Gib® Fyreline each side frame

60/60/60 timber GBTL 60 One layer 12.5mm Gib® Fyreline each side frame60/60/60 steel GBSL 60a One layer 19mm Gib® Fyreline each side frame

Note: To ensure the Gib® Fyreline is protected from the weather once erected the following are essential:Fix the battens, building paper and Harditex immediately the Gib® Standard or Gib® Fyreline is erected.The Harditex must be coated promptly to stop any water ingress onto the Gib® Standard or Gib® Fyreline.

Table 5: Fire-resistance ratings

Fire-resistance rating Winstone Wallboards Ltd Fire-resistant linings requiredand frame type specification number

© James Hardie Building Products

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Acoustic ratingsThe acoustic ratings in Table 6 can beachieved using Harditex as theoutside cladding – for full details ofthese systems refer to James HardieBuilding Products.

A comprehensive list of acousticratings is available from James Hardie.Phone the James Hardie Helpline:0800 808 868.

NOTE: The specifications in Table 6 willrequire battening when the Harditex isfixed over gypsum boards as exteriorcladding.The STC ratings will be enhancedby this battening, therefore the ratings givenwill be on the conservative side.

Table 6: Acoustic ratings for timber frame (load bearing)

Acoustic Detail Basic configuration rating(STC)

7.5mm or 9mm Harditex outside face6mm Villaboard® inside face9.5mm standard-grade gypsumwallboard underlay both sides of frame100 x 50mm nominal timber studs at450mm maximum centres7.5mm or 9mm Harditex outside face6mm Villaboard® inside face12.5mm fire-grade gypsum wallboardunderlay both sides of frame100 x 50mm nominal timber studs at600mm maximum centres7.5mm or 9mm Harditex outside face6mm Villaboard® inside face12.5mm fire-grade gypsum wallboardunderlay both sides of frame100 x 50mm nominal timber studsstaggered at 300mm maximum centresin 150mm nominal timber plates7.5mm or 9mm Harditex outside face6mm Villaboard® inside face12.5mm fire-grade gypsum wallboardunderlay both sides of frame100 x 50mm nominal timber studsstaggered at 300mm maximum centresin 150mm nominal timber platesTwo layers of 25mm acoustic infill incavity approx. weight 48kg/m3

130m

m14

0mm

188m

m18

8mm

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Section 7: Finishing the system

A number of reputable exteriorfinishing systems have been developedfor use with Harditex claddingsheets.These are ideal for residentialand light commercial projects.

This brochure describes three basiccomponents:

• Harditex sheets

• Architectural shapes

• Coating systems

Harditex sheetsFor description refer to page 4.

Architectural shapesThree-dimensional shapes of expandedpolystyrene (EPS) can be fixed directlyonto Harditex base sheets quicklyand easily, giving greater designflexibility.These polystyrene shapesproduce a wide range of architecturaltrim details for windows, arches,cornices and columns. Phone theJames Hardie Helpline:0800 808 868

Pre-meshed and plastered shapes arealso available from Hitex PlasteringLtd, phone (09) 274 0246.

This work is carried out by applicatorsindependently licensed by the selectedsystem manufacturers (refer page 40).

Instead of constructing costly shapes ofwood or wire lath, aesthetic detail canbe achieved very economically.Sculptured architectural shapes can beaccurately cut to a range of designsand thicknesses.

The shaped polystyrene is adhered tothe Harditex , covered with fibreglassmesh, plastered and primed, ready forcoating.

For methods of adhering and finishingthe polystyrene shape apply to thechosen jointing and coatingmanufacturer.

Jointing and coating systemsThe minimum film dry thickness willvary with the type of texture andfinish chosen. (Refer to the chosencoating applicator for details.)

The systems suitable for use withHarditex are 100% acrylic or pureelastomeric high-build texture coatingsor flexibly modified plasters.These aregenerally fade resistant, water resistantand together with the tape-reinforcedjoints are flexible enough toaccommodate thermal expansion andcontraction.The finishing systems offera variety of colours and textures; fromearthy terracotta shades, through tofresh light pastels. Smooth finishesmust be avoided.The medium toheavy textures chosen may varybetween manufacturers.

For full technical details of the coatingsystem of your choice apply to theappropriate coating manufacturer.Alist of reputable coating manufacturersis given on page 40.

The joint and coating systems usedmust be from the same manufacturerto ensure compatibility and systemwarranties.

System essentialsWhen horizontal recessed-edge jointsare installed the timber framing andfloor joists must be thoroughly drybefore jointing and coating isundertaken. Failure to comply withthis will result in downward shrinkageof the framing and joists which can

result in horizontal sheet jointpouting.

Do not use dark colours as they cancause excessive heat build-up on east,west and north-facing walls. Coloursmust have a light-reflective value(LRV) of 40% minimum regardless ofgloss level, i.e. colours tinted fromUltra Deep,Accent and some Mid andDeep tones are not suitable.

Control and expansion joints must bedesigned and built into the system.

Decking bearersWhen timber bearers are fixed directlyover the Harditex cladding, theHarditex sheet must be fullyprotected by a paint coating beforefixing the bearer.

FencingWhen Harditex is used inapplications such as fences or screens itis essential that the timber framing andthe back of the sheet are sealed fromthe weather.Therefore, for fenceapplications it is essential that sheetsare applied to the Harditex

specification on both sides of theframing to completely seal the backface of the sheets.The bottom of thesheets must also be kept 20mm clearof concrete foundations or mowingstrips.

Architectural detailsWindows and cornersRefer to Figs 58 to 62 for suggesteddetails for deep reveal windows.

TransitionsRefer to Figs 63 to 69 for suggestedtransition details for various Harditex

cladding applications.

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Notes:1. The jamb detail can also be formed using

a Harditex™ return similar to that shownin Fig. 58.

2. The planted polystyrene detail can alsobe used (refer Fig. 60).

Fig. 61 JAMB DETAIL(ALTERNATIVE 1)

Window extrusion

TexturecoatingoverHarditex™

Ex 100 x 50timber stud

Insidelining

Timberpack Metal flashing

primed andtexture coated

Fig. 63 ROUNDED CORNERDETAIL

Reinforcing meshadhered toHarditex™ andcarried aroundpolystyrene shape


Timber stud wall

Foampolystyreneshaped insert

Buildingpaper

Buildingpaper

Fig. 62 JAMB DETAIL(ALTERNATIVE 2)

Window extrusion


Ex 100 x 50timber framing

Window headflashing poprivet towindow

Sealantbead

Fig. 64 HARDITEX™ TOSOFFIT DETAIL

Soffit sheet

Flexiblesealant

Harditex™

texturecoating

Timber frame

50mm x1.5mm thick

strip ofInseal 3259

Note: The sill area must be coated with a waterproofing membrane such as AGA Superflex 1before coating commences. Failure to do this can allow water penetration through the coatingdue to the near-horizontal sill surface. This can then cause long-term coating breakdown. Ensurethe applied coating is compatible with the waterproofing membrane used.

Fig. 58 SILL DETAIL (ALTERNATIVE 1)

Window extrusion

Flexible paintable sealant

Recessed-edgetape-reinforced joint

Texture coatingover Harditex™


Inside lining

Timber pack

Fig. 59 SILL DETAIL(ALTERNATIVE 2)

Window extrusion

Texture coatingover Harditex™Ex 100 x 50

timber stud

Insidelining

Timbersill

Metal flashingprimed andtexture coated

Polystyreneadhered ontoHarditex™

Fig. 60 SILL DETAIL(ALTERNATIVE 3)

Window extrusion

Texture coatingover Harditex™


Metal flashing

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Note: Use flexible sealant in the corner mould for high wind exposures.

Fig. 65 CORNER DETAILJAMES HARDIEWEATHERBOARDTO HARDITEX™

Harditex™

texturecoated

Notch stud and pack 7.5mm

James Hardiealuminium corner mould

James HardieWeatherboard

Timber studs

Fig. 66 BRICK VENEER TOHARDITEX™

EXTERNAL CORNERDETAIL

Inseal 31096mm x 10mmthick

50mmoverlap

Timber stud

Harditex™

texturecoated

Brick, stone orblock veneer

50mm

Notes:1. Ensure the final texture coating is compatible with the Superflex 1 membrane or similar used.2. The membrane is used as a back-up waterproofing to the texture coating.3. Refer to selected membrane manufacturer’s instructions regarding the correct methods of

application.

Harditex™

Fig. 68 PARAPET DETAIL

Cover parapet area with AGASuperflex 1 membrane or similar.Use 2 coats and embed fibreglassmatting strip across top and200mm down each side

Harditex™ sheets to berecessed and jointed withreinforcing tape andcompound

Timber framing

Structural timber to give fullsupport to capping sheet incase of foot traffic

Finish parapet withselected texture coating

Fall 1 in 10min. Note: fall

to inside ofbuilding

200m

m

Notes:1. The recommended masking tapes for use

with pre-finished soffits are SellotapeSupermask PVC Blue code 5850 orLongmask 5855 paper tape. These tapesmust be left on the soffit for only seven daysmaximum otherwise tape removal may causepaint loss.

2. Use a flexible sealant between PVC andHarditex™ for high wind exposure.

Fig. 67 SOFFIT DRIP-EDGE DETAIL

50mm x 1.5mmthick strip ofInseal 3259

Harditex™ texture coated

20mm

PVC cap mould4.5mmHardisoffit™ orSilkline™ soffit

Flexiblesealant

Fig. 69 BRICK VENEER TO HARDITEX™ INTERNAL CORNERDETAIL

Brick veneer

Timber frame

Purpose- madeflashing seal intocut in bricks

Inseal 32596mm x 10mmthick

Harditex™

texturecoated

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The following organisations have authorised the listing of their names as independent providers of products and services whichmay be used in conjunction with Harditex and Harditex Premium. These organisations will provide contact details of theirauthorised jointing and coating applicators throughout New Zealand.Providing the Harditex and/or Harditex Premium is installed in full accordance with the current published Harditex technicalliterature then these businesses should provide a warranty covering the jointing and texture coating of the system.James Hardie Building Products warranty the Harditex and Harditex Premium products provided these have been installed infull accordance with the current published Harditex literature.

Fosroc Ltd Flexipaste and Taping Paste • EsternoWellington (04) 568 8046 Taping Paste and Liquid • FlexiformAuckland (09) 273 9292 • Graffiato and Colourkote

External Silk• Flexiform

Resene Paints Ltd Jointflex • ResitexWellington (03) 577 0500 • Thixalon 5

Nuplex Industries Ltd SJ Jointing System • FlexicoteAuckland (09) 579 2029

Equus Industries Ltd Chevaline • Chevaline Spraytex GBlenheim(03) 578 0214 Superfil-2 • Chevaline Arcutex

• Chevaline Covertex

Hitchins-Gunac Ltd Formwall 660 Gap Filler and • Formwall VaritexAuckland(09) 360 3246 Formwall 665 Flushing Compound • Formwall 612 Topcoat

Courtaulds Coatings Armawall Filler • Armawall Trowel On 2mmAuckland(09) 828 3009 • Armawall Roma

• Armawall Travertine 2mm

Plaster Systems Ltd Multiplast • Multiplast Plaster and Auckland (09) 444 6440 Multiplast Plaster and Resin and Wattyl Solarguard Finish

Multiplast Finishing Compound • Ezytex Sponge• Colorplast Sponge• Formstone Acrylic Plaster• Multiplast Texture

Coastal Coatings Ltd Acryltex Texture Plaster • Acryltex Texture CoatTauranga (07) 575 7266 followed by 3 coats Taubmans

Semi Gloss Acrylic

Alchemis Ltd Alchemix Aquafill • Alchemix Aquatex PretextureAuckland (09) 274 6652 followed by 2 coats Alchemis

Body Coat

Special Finishes Flexicure 500 Jointing Coat • Flexiscribe followed by one coatAuckland (09) 818 9595 Colour Trend Hi Build colour

• 2 coats Stipletex

Ultralite Texture Coatings Ltd Ultralite Smooth • Ultralite trowel coat followed bySilverdale, Auckland (09) 426 2242 Patch Ultralite flex coat

ICI Paints (Dulux) Acra Patch 500 • Acra Prime 501Wellington • Acra Tex Membrane 353(04) 568 4259 • Acra Shield 355

• Acra-Glaze 356

Aston Acrylics (Styrocrete Holdings Ltd) Styrocrete Jointing compound • Styrocrete acrylic pigmented texture systemTauranga (07) 578 5347

Granosite Granoflex HT and • Granoskin decorative membraneWattyl NZ Ltd Granopatch Smooth • Granotex(09) 828 4009 • Granopearl

Levene & Co Flexicure Levene Elastomeric Texture Coat(09) 273 7045 Fine, Medium or Coarse

Harditex jointing and coating systems

COMPANY JOINTING SYSTEMS COATING SYSTEMS

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Auckland

Head Office:50 O’Rorke Road,PO Box 12 070 Penrose,Auckland.Phone: 09 579 9919Fax: 09 579 7210

Wellington

63 Western Hutt Road,Petone,WellingtonPO Box 38-179Lower Hutt.Phone: 04 568 3961Fax: 04 568 5050

Christchurch

51 Buchanans Road,Sockburn,PO Box 11106Christchurch.Phone: 03 342 8890Fax: 03 342 6176

For more information call the JamesHardie Helpline (see below) toll free.

Prior to working with this product itis important that you refer to

‘Working Safer withSilica-based Products’.

For more information or a copy ofthis leaflet, contact:

James Hardie Helpline

0800 808 868Monday to Friday 7.30am to 6.00pm

1028 June 1998

HARDITEX™

T E C H N I C A L I N F O R M AT I O N

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Harditex is the ideal lightweight cladding for

a monolithic finish, yet it provides you with the

comfort and peace of mind that comes with the

stability and strength of James Hardie fibre cement.

The only limiting factor is your imagination.

June 1998J

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