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G Y P 5 4 7 M a y 2 0 1 0
Residential Installation Guide
Including Wet Area Systems
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Gyprock Residential Installation Guide2
ContentsGeneral InstallationIntroduction 2
Description 2
Applications 2
Advantages 3
Gyprock Plasterboard Range 4
Architectural Specification 7
Handling & Storage 8
Design Considerations 8
Levels of Finish 12
Framing 14
Sheet Layout 16
Fixing Systems 18
Masonry Walls 24
Curved Walls 26
Control Joints, Door Jambs 30
Back-Blocking Joints 31
Jointing Systems 34
Jointing Hand Applied 36
Jointing with Mechanical Tools 39
Arches 40
Cornice Fixing 41
Decoration 42
Wet Area Lining SystemsDescription 43
Applications 43
Advantages 43
Components 44
Framing Preparation 44
Aquachek Installation 44
Construction Details Shower Areas 45
Construction Details General Wet Areas 52
Joint Treatment 55
Surface Decoration 55
Maintenance 55
Health, Safety & Guarantee 56
Contact Information 56
Introduction This guide provides detailed installation information for thefixing of Gyprock plasterboards in residential constructionincluding wet area applications.
For additional information or assistance with plasterboardfixing. please contact the CSR Gyprock office in your region.
DescriptionGyprock plasterboard is a machine made sheet composedof a gypsum core encased in a heavy duty linerboard. Thelinerboard is folded around the long edges to reinforce andprotect the core. The board ends are cut square. Gyprock plasterboard conforms with manufacturing standard
AS/NZS2588 Gypsum Plasterboard.
Product ManufactureGyprock plasterboard products are manufactured fromgypsum, paper and a small amount of additives. Gypsum isa naturally occurring, non-toxic sedimentary rock. The paperliner board used for plasterboard and cornice is made from100% recycled newspapers and cartons and the additivesare benign materials such as starch and foam.
The energy used in the manufacture of Gyprock is amongstthe lowest of any building product. Emissions are limited towater vapour and products of natural gas consumption.
Good Environmental Choice Australia The original Gyprock EC08 with reCore technology wasthe first Australian made plasterboard to have been Certifiedby Good Environmental Choice Australia (GECA). Now, threeboards in the EC08 range carry GECA certification.
This certification as a good environmental choice meansthat the product complies to the environmental and socialperformance characteristics as detailed in the voluntary
environmental labeling standard - Panel Boards.
Green Building Council of Australia(GBCA)
Th e Gr ee n Bui ldi ng Co un ci l of Au st ra lia (G BCA ) is Australias leading authority on green building. The GBCA was established in 2002 to develop a sustainable propertyindustry in Australia and drive the adoption of green buildingpractices. The GBCA promotes green building programs,technologies, design practices and processes, andoperates Australias only national voluntary comprehensiveenvironmental rating system for buildings - Green Star.
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Gyprock Residential Installation Guide 3
AdvantagesStrength & Stability Gyprock plasterboard is a stable building product whensubjected to the normal range of ambient temperatures andhumidity.
Thermal coefficient of expansion is:
16.2 x 10 -6 /C in the temperature range 4C to 38C.
Hygrometric coefficient of expansion is:
7.2 x 10 6mm/mm/% R.H. (5%-90% R.H.).
Thermal Resistance R is:
10mm thickness = 0.06 m 2k/w.
13mm thickness = 0.08 m 2k/w.
16mm thickness = 0.09 m 2k/w.
ApplicationsGyprock plasterboard is used as an internal lining boardto provide smooth, strong, long-lasting walls and ceilingsfor homes, offices, hospitals, hostels for the aged, schools,shops and factories. Its durable surface will accept mosttypes of decorative finishing, including paint, wallpaper and
texture compounds.
Joints between Gyprock plasterboard sheets are reinforcedand concealed to provide a smooth, durable finish to thewhole surface. Alternatively, the joints may be covered witha decorative moulding.
Standard Gyprock plasterboard or Gyprock Aquachek can be used for exterior ceilings and eaves lining, providedthe ceilings are protected from the weather.
Standards The entire range of Gyprock plasterboards, as referenced inthis technical literature, complies with the following standard.
Plasterboard Manufacture
AS/NZS2588 Gypsum Plasterboard.
Other referenced standards are:
AS/NZS2589 Gypsum linings Application and Finishing.
AS3740 Waterproofing of wet areas within residentialbuildings.
AS2311 The painting of buildings.
AS4858 Wet area membranes.
AS3958.1 Guide to the installation of ceramic tiles.
AS4055 Wind loads for housing.
AS4992 Ceramic tiles grouts and adhesives.
AS1684 Residential timber framed construction.
AS1720.1 Timber structures.
AS3623 Domestic metal framing.
AS/NZS4600 Cold formed steel structures.
AS/NZS3000 Electrical installations.
CD Technology Controlled Density (CD) technology is a unique manufacturingprocess which manipulates the core structure of plasterboard.
This creates greater strength, lighter weight and superior
paper to core bonding, meaning easier handling, bettercutting, and a better quality plasterboard. CD Technologyis used in the manufacture of 10mm and 13mm RecessedEdge Gyprock plasterboard, 10mm Gyprock Supaceil ,and 10mm and 13mm Square Edge Gyprock plasterboard.
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Gyprock Residential Installation Guide4
Gyprock Plasterboard Range
TABLE 1: GYPROCK PRODUCT AVAILABILITY
Colour shading behind each product approximates the colour of the product face liner sheets.
Gyprock Product Thicknessmm
Widthmm
Sheet Length (mm) Masskg/m 22400 2700 3000 3600 4200 4800 5400 6000
CD RECESSED EDGE
101200 W W W W W W W W
6.51350 W W W W W W
13
900 * WST W W8.51200 ST W ST WST
1350 ST W
CD SQUARE EDGE10 1200 W ST WST W 6.513 1200 ST ST 8.5
CD RECESSED EDGE/
SQUARE EDGE10
1200 W6.51210 W
1350
SUPACEIL 10
900 W W W W7.21200 ST W
1350 W SOUNDCHEK 13 1200 13.0
AQUACHEK 10
1200 ST 8.0
1350 ST ST WST ST WST 13 1200 W W 10.4
IMPACTCHEK 13 1200 10.3
SUPERCHEK 101200 10.4
1350 10.4
EC08 PARTITION 13 1200 9.3
EC08 FIRE 13 1200 10.5EC08 IMPACT 13 1200 12.1
FLEXIBLE 6.5 1200 4.25
FYRCHEK 13 1200 W 10.516 1200 ST W 12.5
FYRCHEK MR13 1200 WST ST 10.716 1200 WST W ST 13.5
PERFORATED SHEET 13 1200 10.0
SHAFT LINER PANEL 25 600 19.8
COVE CORNICE
55 0.7kg/m
75 W W T 0.9kg/m 90 1.3kg/m
CLASSIC CORNICE 90 1.2kg/m
TEMPO CORNICE 90 1.8kg/m
SYMPHONY CORNICE 75 0.9kg/m
CONCERTO CORNICE 90 1.6kg/m
JAZZ CORNICE 75 1.8kg/m
SHADOWSET 105 1.0kg/m
Indicates AVAILABLE in: = All States & Territories; N = NSW; W = Western Aust.; S = South Aust.; T = Northern Territory.Indicates NOT AVAILABLE in: N = NSW; W = Western Aust.; S = South Aust.; T = Northern Territory.* = Length is 2740. = 3300 and 3900mm lengths also available in WA only.
Additional sizes may be available in some products. Call your state office for details.
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Gyprock Residential Installation Guide 5
Features Designed to provide enhanced
acoustic resistance in wall andceiling systems.
A machine made sheet composedof a high density gypsum coreencased in a heavy dutylinerboard.
Long edges are recessed to assistin producing a smooth, even andcontinuous surface once jointed.
13mm thickness. Manufactured to the requirements
specified in AS2588 : 1998 Gypsum Plasterboard.
Gyprock Soundchek
Features Specially processed plasterboard. Both the core and linerboard
facing are treated in manufactureto withstand the effects of moistureand high humidity.
Manufactured to the requirementsspecified in American Society for
Testing and Materials C630. For use as a wall and ceiling lining
in wet areas and high moistureareas in residential and commercialapplications.
Recessed edges allow flush jointingto Recessed Edge Plasterboard.
Applications Gyprock Aquachek is a suitable substrate for ceramic tiles. Usage areas include bathrooms, kitchens, laundries. garages and ceiling
applications such as walkways and verandahs. The Gyprock Aquachek Wet Area Lining System is suitable for walls in
high, medium and low risk level wet areas as defined in AS3740.
Gyprock Aquachek
Features 1.5mm recess on face side allows
formation of shallow channel for joint reinforcement.
Provides smooth. even andcontinuous surface once jointed.
10mm and 13mm thickness. Manufactured to the requirements
specified in AS2588 : 1998 Gypsum Plasterboard.
M a n u f a c t u r e d w i t h C Dtechnology.
Applications Internal walls and ceilings.
Gyprock Plasterboard CD Recessed Edge
Features M a n u f a c t u r e d w i t h C D
technology.
Square Edge Finishing The square edge allows sheets to
be butted together neatly. These joints may be covered
with aluminium, vinyl or timbermouldings.
Bevelled Edge Finishing Edges are slightly bevelled. Edges are butted together to form
a neat V-joint. Joints do not need to be covered
with battens or finished withcompounds.
Manufactured to the requirements specified in AS2588 : 1998 GypsumPlasterboard.
Applications Internal walls. Usually commercial construction, especially for office partitioning.
Gyprock Plasterboard CD Square Edge
Features 10mm thick recessed edge
plasterboard. Specially formulated to span
600mm on ceilings. White face paper to improve paint
coverage. M a n u f a c t u r e d w i t h C D
technology.
Applications Internal ceilings with joists at
600mm maximum centres.
Gyprock Supaceil
Features 6.5mm thickness plasterboard
with an enhanced core to allowbending to small radii.
Designed for installation as a twolayer system.
Long edges are recessed on theface side to assist in producinga smooth, even and continuoussurface once jointed.
Manufactured to the requirementsspecified in AS2588 GypsumPlasterboard.
M a n u f a c t u r e d w i t h C Dtechnology.
Applications Curved internal walls and ceilings.
Gyprock Flexible Plasterboard
Gyprock Plasterboard Range
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Gyprock Residential Installation Guide 7
Tempo Cornice
Concerto Cornice
Symphony Cornice
Jazz Cornice
ShadowSet Profile Plant-on
Classic Cornice
ShadowSet Profile Flush
ArchitecturalSpecificationScope
The contractor shal l furn ish al l material s, labour andequipment required to satisfactorily complete the installationand jointing of all Gyprock Plasterboard where indicated onthe drawings and/or as specified.
Delivery & Storage of Materials All materials shall be del ivered and stored in an enclosedshelter providing protection from damage and exposure tothe elements. Damaged or deteriorated materials shall beremoved from the premises.
Materials Al l li ning material s shal l be Gypro ck plasterboards,adhesives, fasteners and jointing products as manufacturedor supplied by CSR Gyprock.
Non-loadbearing metal wall components and ceilingcomponents shall be those manufactured by RondoBuilding Services Pty. Ltd (or products of equivalent orbetter performance).
Framing or Substrate
Al l fr amin g sh al l be prepared to *L evel .. .. .. .. Fi ni shspecifications as detailed in the Gyprock PlasterboardRes iden t i a l I ns t a l l a t ion Guide , NGYP547 , and
AS/NZS2589.1 Gypsum linings Application and Finishing.
Framing must also conform to structural standards specifiedby the appropriate building authorities and/or AustralianStandard.
Plasterboard Installation The framing shall be lined on the first side with *...... layer(s)of .......mm Gyprock ............. plasterboard.
The framing shall be lined on the second side with * ...... layer(s) of .......mm Gyprock ............. plasterboard.
Plasterboard Fixing & JointingGyprock plasterboard shall be fixed, jointed and finishedto a * Level ............ Finish as detailed in the Gyprock Plasterboard Residential Installation Guide, NGYP547, and
AS/NZS2589.1 Gypsum linings Application and Finishing.
* Insert or select appropriate specification.
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Gyprock Residential Installation Guide 11
Exterior CeilingsGyprock plasterboard is suitable for lining ceilingsof carports, verandahs, alfresco dining areas, eaves orareas that are horizontal or incline downwards away fromthe building, provided the ceiling is protected from directexposure to rain.
Suitable types of plasterboard include 10-13mm, Gyprock
Aquachek , Gyprock FyrchekMR and Gyprock Supaceil .
In these applications:
Ceilings must be installed after the roof cladding has beencompleted and sealed.
Effective cross-ventilation for all spaces between the roof and the ceiling is to be provided.
Where high fronted eaves gutters are installed, care shouldbe taken to ensure that water will not flow back into theroof or building structure.
External ceilings are subject to wind loads and the ceilingframing in these cases should be designed to suit. Refer to
AS1684 or the appropriate framing manufacturer for moreinformation. Plasterboard installation details are suitablefor wind classification N1 and N2 to AS4055.
Plasterboard to be fixed using screws or nails only.
Back-block all plasterboard joints.
Plasterboard and cornice must be finished with an externalgrade paint system. Apply a good quality wallboard
sealer and two coats of external grade paint to paintmanufacturers recommendations.
In highly corrosive environments such as coastal areas orin applications were corrosion is of concern, the RondoE-beads should be used in place of metal casing beads.
Furring channel
GYPROCK plasterboard
Wall angle
Drop beam or masonry wall
FIG 4: METAL WALL ANGLE EDGE FINISH
Joist
Furring channel
GYPROCK plasterboard
Metal Angle
Drop beam or masonry wall
FIG 3: METAL ANGLE EDGE FINISH
Joist Trimmer
Drop beam or masonry wall
GYPROCK plasterboard Wood trim
6mm Gap
FIG 2: TIMBER TRIM EDGE FINISH
Fix cornice to ceiling with Gyprock Cornice Cement
Fastener (optional)
GYPROCK plasterboard
Cornice
Joist
Flexible Mastic
Drop beam or masonry wall
FIG 5: CORNICE EDGE FINISH
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Gyprock Residential Installation Guide12
Selecting a Level of Finish
Levels of FinishLevels of finish are defined in the Australian/New ZealandStandard AS/NZS2589.1 Gypsum linings Application
and Finishing. This standard is intended to provide builders,plasterboard installers and finishers, and their customers
with the various defined methods and practices necessaryto meet the customers expectations in terms of the Levelof Finish.
Three Levels of Finish (3, 4 and 5) are defined, and minimum
specifications to achieve each level of finish are detailed in
the standard for each of the installation processes fromframing preparation to finishing.
It is essential to determine the level of finish required beforethe frame construction begins, as specific tolerances are
required for frame alignment as well as for plasterboard fixingand finishing for each of the levels of finish. Unless these
requirements are met throughout construction, it may not bepossible to attain the desired finish level without extensivecorrective measures.
The level of finish specified also affects the methods of jointing,
particularly butt joints and back-blocking requirements, thenumber of coats of joint compound applied, and the fittingand finishing of stopping beads.
It should be noted that, generally, domestic applications
should be prepared to a minimum Level 4 Finish unlessspecifically a higher or lower level of finish is agreed to by allcontracting parties.
SelectionFactors affecting the level of finish include the surfacesvisibility, the texture and gloss level of the final decoration andthe lighting conditions. Critical light is that projected acrossthe surface at low angles of incidence, as opposed to diffuselighting or light striking the surface at close to right angles.
A good method to overcome differences in opinions of quality is to prepare a sample area in a suitable position andfor all parties to agree on the finish.
For further information on levels of finish, refer to PlasterboardExpectations, available from the Association of Wall & CeilingIndustries.
Level 3For use in areas that do not require a finish, such as aboveceilings and inside service shafts and other inaccessiblespaces. All joints are to be taped with two applicationsof compound and all fastener heads are to be covered.Compound is to be finished smooth, such as by scrapingridges etc with a trowel.
Finish Not Important or Undecorated
Wall covering,Wallpaper or Texture
Flat/Matt/Satin/ Low Sheen
Pastel/ Mid-tones
Dark tones
Non-critical Lighting
Critical & Non-critical Lighting
Level 4 Finish Level 3 Finish
Critical Lighting
Level 5 Finish
DECORATION
Paint
Semi-gloss/Gloss
Critical & Non-critical Lighting
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Gyprock Residential Installation Guide14
FramingMaterialsGyprock plasterboard may be fixed to timber ormetal framing and masonry materials which conform tostandards specified by the appropriate government building
authorities.
All timber framing shall be in accordance with AS1684 Residential Timber Framed Construction or AS1720.1 Timber Structures.
Metal framing shall be in accordance with AS/NZS4600 or AS3623, as applicable.
Gyprock plasterboard may be fixed direct to structuralmetal ceiling framing not exceeding 1.6mm thickness.
Brick or block masonry surfaces which comply with AS3700can be sheeted with Gyprock plasterboard adhered directlyto the wall with Gyprock Masonry Adhesive. Alternatively,these surfaces may have a furring system applied inaccordance with AS1684, and fixed in accordance with theappropriate Gyprock system.
PreparationThe fixing of Gyprock plasterboard linings isdeemed to be acceptance of the substrate.
Substrate members which are to support a joint shall have aminimum flat fixing face width of 35mm for timber or 32mmfor steel, to enable adequate fixing of the plasterboard. Allother substrate members are not to be less than 30mmwidth.
All substrate members are to be straight and suitable for theapplication of Gyprock plasterboard. Noggings must notprotrude to interfere with the linings and should preferablybe set back from the line of studs.
The deviation in the alignment of the bearing surface(s) shallnot exceed the tolerances given in Table 2 when measuredwith a straight edge over a span of 1800mm along individualmembers or across adjacent members.
NOTE: A minimum of 90% of all framing shall be inaccordance with the appropriate tolerance specified. Theremaining 10% (maximum) of framing shall be within +1mmof the allowable deviation.
Where the alignment of the fixing surface plane falls outsidethe appropriate tolerance, a suitable levelling system is tobe used.
Where the alignment of the bottom chords of roof membersfall outside the appropriate specification, a metal furringchannel system on sliding clip fixings can be used toenable the levelling of the ceiling support plane. Refer to theGyprock Ceiling Systems Installation Guide, NGYP570 fordetailed information.
Trimmers are to be provided in the part of the ceiling framingsystem where primary support members change directionwithin a room. (Refer to FIG 1 and 6).
All openings are to be framed.
Where battens are used, they are to be selected and appliedin accordance with AS1684, and maximum spacings are tobe in accordance with Table 4 in this publication.
Gyprock plasterboard may be fixed directly over existinglinings if they are firm, sound and suitably straight for theLevel of Finish chosen.
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Gyprock Residential Installation Guide 15
FURRING CHANNELRONDO N308/129
CEILING BATTENRONDO N301
FIXING CLIPRONDO N314/305
FIXING CLIPRONDO N226
RESILIENTFURRINGRONDO N581
GYPROCK RESILIENT MOUNT
Ceiling Batten & Furring Channel Installation
The use of metal battens or furring channel on ceilingsproduces a more consistent and stable fixing system, andallows levelling of the ceiling mounting surfaces.
Install Batten or Furring System as follows:
Accurately align and level Fixing Clips and fix to the sideof the truss bottom chord.
Wall angle or trims may be used at perimeter for alignmentor support if required.
Fit Batten or Furring Channel into fixing clips.
Join furring channel end to end using channel joiners.
TABLE 4: MAXIMUM SPANS FOR METAL BATTEN/FURRING CHANNEL USED IN CEILINGS
Gyprock Plasterboard
Layers x Thickness
N301
Ceiling Batten
N581*
Resilient Furring
N308*
Furring Channel
N129*
Furring Channel
Batten Spacing Spacing of Furring Spacing of Furring Spacing of Furring
450 600 450 600 450 600 450 600
Maximum Permissible Spans for Metal Batten/Furring
1 x 10mm all productsExcept Gyprock CDand SOUNDCHEK
1200 1000 600 600 1000 900 1550 1400
1 x 10mm Gyprock CD 1200 600 1000 1550
1 x 10mm SOUNDCHEK 1 x 13mm all products
1200 1000 600 600 1100 1000 1550 1400
1 x 16mm FYRCHEK 600 600 1100 1050 1550 1400
2 x 10mm SOUNDCHEK 2 x 13/16mm FYRCHEK
600 600 1100 900 1400 1300
NOTE: Furring to be continuous over 2 or more spans. Dead load deflection Span360. * Includes Internal UDL of 0.25kPa.
TABLE 3: MAXIMUM SPAN OF PLASTERBOARD
Gyprock Plasterboard Maximum Spacing of Framing Members
Thickness/Product
Walls Ceilings
General Applications
(mm)
High Humidity
and external areas
(mm)
10mm Plasterboard CD 600 450
10mm all types except Plasterboard CD 600 600 450
13mm all types 600 600 450
16mm FYRCHEK 600 600 450
Note: Maximum 2 .0 kg/m 2 insulation material may be used in ceilings.
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Gyprock Residential Installation Guide16
Sheet Layout The fol lowing installation information should be read inconjunction with Table 2, to determine the requirementsapplicable to the chosen Level of Finish.
Gyprock plasterboard should be installed after theinstallation of plumbing and electrical services and thecompletion of wet trades.
Provide adequate ventilation in all structures to minimise airhumidity. Excessive humidity may result in the plasterboardsagging.
PlasterboardHorizontal application of plasterboard on walls is generallyrecommended because it:
Reduces joints by up to 25%.
Provides a stronger wall. Reduces the possibility of unacceptable light reflections
around joints.
Joints are at a more convenient height for finishing.
However, the orientation should be chosen so that anycritical light falls along the recessed joints; the number of butt joints is minimised; a single sheet may be fixed verticallywhere it covers the whole wall.
Nogging is not required behind recessed edge joints inhorizontal applications.
Partitioning fixed to steel framing in commercial applicationsis typically sheeted vertically.
The lower edge of wall sheets is to be kept a minimum 6mmabove the finished floor level.
Ceiling sheets are to be installed with the long edge at rightangles to the direction of the joists/main support members.
GYPROCK Plasterboard
Furring Channels perpendicular to main trusses
Wall Frame
Jack Joist
Trimmers
Girder Truss
Main Trusses
FIG 7: FURRING SYSTEM FOR TRUSS ROOFCONSTRUCTION
Gyprock Resilient Mounts The Gyprock Resilient Mount is a proprietary componentused in conjunction with Rondo steel sections for fasteningGyprock plasterboard to a supporting structure whilesimultaneously isolating it from structure borne vibration.
This significantly reduces the amount of impact noise, speechand low frequency sound filtering through to rooms above,
below or alongside the noise generating room.
FIG 6: CEILING TRIMMERS WHERE TRUSSES CHANGEDIRECTION
Ceiling Trimmers
Bottom Cord of Girder Truss
Jack Joist
Standard Trusses
GYPROCK Plasterboard
Wall Framing
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Gyprock Residential Installation Guide 17
200mm minimum from joint to edge of opening
Minimum 6mm gap between sheet and floor
200mm minimum from joint to edge of opening
Full width sheet
Full width sheet
Split width sheet
Split width Sheet
Use full length Sheets wherever possible Stagger Butt Joints in adjacent sheets
Avoid butt joints over single and cavity sliding doors
FIG 8: SHEET LAYOUT
Joint LocationWhere possible it is recommended that full length sheets areused to minimise butt joints at sheet ends. Sheets should bebutted neatly together, but not forced.
Where butt joints at sheet ends are unavoidable and where jointing between framing members is not required, as per Table 2, butt joints may be formed on a framing member,
provided that the framing member has a bearing face equalto or greater than 35mm width for timber framing or 32mmwidth for steel framing.
Where butt joints are permitted on framing members, buttsheet ends together centrally over the framing member.
Butt joints on walls are not to coincide with the edge of openings (eg doorways or windows). Sheets are to be laid sothat any vertical butt joint falls a minimum of 200mm from theedge of an opening. Avoid butt joints over single doorwaysand cavity sliding doors wherever possible.
Where a butt joint in a wall is less than 400mm long andis located more than 2 metres from the floor, then back-blocking may be omitted.
Butt joints in adjacent sheets on the same side of a wall, andin adjacent sheets on opposite sides of the same wall, areto be staggered and located on/between different framingmembers.
Where back-blocking of joints is required as per Table 2, referto Back-Blocking Joints section in this guide for installationprocedures.
Control joints are to be provided as detailed in the ControlJoints section of this guide.
Where indicated in Table 2, external corners subject todamage are to be protected with a suitable Gyprock metalcorner bead attached and finished as per details in theJointing section of this guide.
Electrical WiringWhere electrical wiring is obviously mounted for connectionto a wall or ceiling fixture, the installer shall pass the cablesthrough a neat, close-fitting hole in the face of the sheet atthe appropriate position clearly marked by the electrician.
Plasterboard CuttingGyprock plasterboard can be cut by scoring the facelinerboard with a knife and snapping the plasterboard back away from the scored face. The back linerboard can then becut from the back towards the front. Alternatively a saw maybe used from the front face.
Cut edges are to be smoothed as required to permit neat joints. A metal T-square will assist in creating a clean, straightcut.
All cut-outs for pipes, electrical installations, fixtures etc, areto be scored on both faces before removal, or are to be cutout with a suitable tool. The use of an impact tool such asa hammer is not an acceptable method of producingcut-outs.
If the plasterboard adhesive is not properly cured, hold the
sheet in place with temporary blocks on adjacent studs or joists while making cut-outs.
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Gyprock Residential Installation Guide18
Fixing SystemsCSR Gyprock has developed a number of fixing systemsdesigned to cater for steel and timber framed walls andceilings.
The fixing systems detailed in this brochure are for interiorapplications in wind category N1 to N4, and for externalapplications up to N2, as defined in AS4055. These systemsare based on a net pressure of 0.5kPa.
Generally the recommended fixing system for interiorapplications is a combination of adhesive and permanentfasteners. The fastener only fixing system is to be used inexterior applications and areas where adhesive cannot beused, such as in fire rated installations, tiled areas and overexisting linings or vapour barriers. For fixing in tiled areas,refer to Wet Area Lining Systems in this publication.
When fixing plasterboard for ceilings use either the 1/3
Spacing fastener-and-adhesive installation method or theall-fastener installation method for:
painted battens (eg Colorbond)
timber that is CCA or LOSP (H1 to H3) treated
or in garages
Contact CSR Gyprock for recommendations that apply inWestern Australia.
AdhesiveGyprock Acrylic Stud Adhesive can be used (in conjunctionwith fasteners) to fix Gyprock plasterboard to timber orsteel framing. It is coloured blue for easy identification, andcan be used on both timber and steel in temperatures notless than 5C. It has a low toxicity, and does not represent
a fire hazard when used in confined spaces. It is easilyremoved from tools and hands before the adhesive cures
Contact surfaces must be free of oil, grease or other foreignmaterials beforeapplication.
T h e a d h e s i v eis applied witha b r o a d k n i f eto form 25mmd i a m e t e r b y1 5 m m h i g hwalnuts.
Available in 5.5kgand 1kg buckets.
WARNING
Stud adhesive MUST NOT be used on TILED WET AREA systems.
Daubs of adhesive must never coincide with fastenerpoints.
Stud adhesive does not constitute a fixing system on its
own and it must be used in conjunction with nail or screwfasteners.
Fasteners The fol lowing fasteners are used with timber and steelframing to accommodate most installation applications.
When fixing to timber that has been treated with copper-based compounds, such as CCA, ACQ and copper azole,use hot-dip galvanised clouts or class 3 screws. For timberframing with other treatments, contact the manufacturer forthe applicable class of fixing.
Ring Shanked Nails
Hardwood 25 x 2.8mm.Softwood 30 x 2.8mm.
Clouts
(Hot-dip galvanised).30, 40 and 50mm x 2.8mm.
Plasterboard Screws
N6 Type Wfor timber framing.
N6 Type S Needle Pointfor lightweight steel studsand furring channel up to0.8mm thickness
N6 Type S Drill Pointfor steel framing 0.8mmto 1.2mm thickness.
TABLE 5: FIXING MATERIAL USAGE APPROXIMATE QUANTITIES USED PER 100 m 2 OF GYPROCK PLASTERBOARD (PER LAYER)
Fixing System Framing Centres (mm) Adhesive Nails Screws
Adhesive + Nail 600 3.5 kg 1.0 kg
Adhesive + Screw 600
450
3.5 kg
4.2 kg
620
750
Fully Screwed 600 (Vertical Sheets)
600 (Horizontal Sheets)
450 (Horizontal Sheets)
1150
820
1000
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Gyprock Residential Installation Guide 19
Combination Adhesive/FastenerFixingCombination adhesive/fastener fixing may be used forinternal walls and ceilings. When used in accordance withthe following instructions the adhesive/fastener method of fixing produces a system which is comparable in strengthto a fully nailed or screwed wall or ceiling. This method also
reduces the number of fasteners required and minimises thepossibility of nail pops due to frame movement.
Gyprock Acrylic Stud Adhesive has good gap-fillingproperties and will bridge board and studs which are slightlyout of alignment.
When temporary fasteners are used, they should remainin place for a minimum 24 hours, or longer in slow dryingconditions.
The application of rows of adhesive and permanent fastenersacross the plasterboard sheet shall comply with Table 7.
Cautionary Notes:
To reduce the possibility of fasteners popping, permanentfasteners should not be closer than 200mm from the edgeof adhesive daubs.
Contact surfaces of framing must be free of oil, grease orother foreign materials.
The final bond of Gyprock Stud Adhesive may beunsatisfactory if:
Used on wet or unseasoned timber.
Temporary blocks/fasteners are removed too early.
Board Width (mm) Minimum Number and Placement of Adhesive Daubs and Fasteners across sheet
Walls Ceilings
Conventional Spacing
Ceilings
1/3 Spacing
1200 F A A A A F F A A F/F A A F F A F A F A F
1350 F A A A A A F F A A F/F A A F F A F A F A F
F = one nail or screw A = one adhesive daubF/F = two nails or one screw
TABLE 7: ADHESIVE DAUBS AND PERMANENT FASTENER REQUIREMENTS
TABLE 6: MINIMUM FASTENER LENGTH(WALLS & CEILINGS - SINGLE LAYER INSTALLATIONS)
Plasterboard
Thickness
Minimum Fastener Length (mm) for fixing to
mm Hardwood Softwood Metal 1.2mmthickness
Clouts(Hot Dipped Galvanised)
10
13
16
30
30
40
30
40
50
Ring Shank Nails
10
13
25
25
30
30
Screws N6 *
10
13
16
25W/25S
25W/30S
30W/30S
25W/30S
30W/30S
30W/45S
25S
25S
30S
* 30mm screws are the minimum for timber framed ceilings, while
25mm can be used for walls. Type W = Wood screw. Type S = Steel frame screw, needle and dril l point. Needle point for steel frame up to 0.8mm thick and hardwood
where indicated. Drill point for steel frame from 0.8 to 1.2mm thick.
Fastener InstallationFor recessed joints and butt joints on framing, positionfasteners opposite each other and between 10mm and16mm from sheet edges.
All fasteners are to be driven home with the head sl ightlybelow the surface of the sheet, but not punched through theface linerboard. Care should be taken to avoid damaging theface or core of the plasterboard.
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Gyprock Residential Installation Guide20
Adhesive/Fastener Fixing toTimber Framed Walls Apply Gyprock Acrylic Stud Adhesive to the studs with
a broadknife, using enough material to form daubs of adhesive 25mm in diameter and 15mm high.
Apply daubs in the appropriate pattern as per Table 7,spaced at 300mm maximum centres, and a minimum200mm from fastener positions. Omit daubs at all fasteningpoints, at butt joints on frame members, around openingsand at internal and external corners.
Apply Gyprock plasterboard horizontally, fastening alongone recessed edge at each stud.
Press the sheet firmly against the studs, then fasten alongthe second recessed edge at each stud.
Stagger butt joints a minimum 450mm between adjacentsheets, and not in the same stud space. Stagger butt
joints on opposite side of the wall.
Where butt joints on framing members are permitted,nail at 150mm maximum centres or screw fix at 200mmmaximum centres.
Fasten internal or external corners and around all openingsat 300mm maximum centres.
Hold the sheet against the studs for a minimum 24 hourswith temporary fasteners driven through plasterboardblocks along the centreline of the sheet at every secondstud.
NOTE : Daubs of adhesive must NEVER coincide withfastening points.
Adhesive/Fastener Fixing toTimber Framed CeilingsGyprock plasterboard is to be installed with paper boundrecessed edges at right angles to the joists/main supportmembers.
Apply 25mm diameter and 15mm high daubs of Gyprock Acrylic Stud Adhesive to the framing members in theappropriate pattern as per Table 7. Daubs are to bespaced at 230mm maximum centres, and a minimumof 200mm from fastener positions. Omit daubs at allfastening points, at butt joints on frame members, and atcornice line.
Apply plasterboard and fasten one recessed edge at eachframing member.
Press the sheet firmly against the framing, then fastenalong the second recessed edge at each stud.
Apply intermediate fasteners at each framing member asper Table 7.
Where butt joints are to be formed between framing,prepare back-blocking as per Back-Blocking details laterin this publication.
Where butt joints on framing members are permitted,nail at 150mm maximum centres or screw fix at 200mmmaximum centres.
Fasten around service openings with nails at 150mm max.centres or screws at 200mm max. centres.
Fasten ends of sheets at a maximum 300mm centres fora cornice finish, or at a maximum 150mm centres for aset finish.
Under slow drying conditions, hold 1350mm wide sheetsagainst the framing members with temporary fastenersdriven through plasterboard blocks as detailed, for at least48 hours.
NOTES: Daubs of adhesive must NEVER coincide withfastening points.Refer to the Back-Blocking section of this guidefor installation procedures.
Adhesive daubs at 300mm max.centres
300mm centres
Temporary fasteners through blocks
Back-block joints formed between studs
Use adhesive daubs to strap bracing to reduce rattling
6-10mm Gap between sheet bottom edge and floor
FIG 9: ADHESIVE/FASTENER FIXING TO WALLS
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Gyprock Residential Installation Guide 21
1200mm 1200mm Two nails or
one screw at sheet centre in each frame member
Adhesive daubs at max. 230mm centres
Adhesive daubs min.200mm from fasteners at edges and centre
FIG 11: ADHESIVE/FASTENER FIXINGTO BATTENED TIMBER FRAME CEILINGS
1200mm 1350mm
Two nails or one screw at sheet centre in each frame member
Adhesive daubs min. 200mm from fasteners at edges and centre
Adhesive daubs at max. 230mm centres
Under slow drying conditions use temporary blocks on 1350mm wide sheets
FIG 10: ADHESIVE/FASTENER FIXING TO TIMBERFRAMED CEILINGS
Adhesive/Fastener Fixing toMetal FramingPrepare metal frame work as for timber, ensuring that allmetal surfaces to receive Gyprock Acrylic Stud Adhesiveare wiped clean with a rag, or if heavily contaminated withoil, grease, or other foreign material they should be cleanedusing an organic solvent.
Gyprock plasterboard is fixed to metal framing the sameway as to timber, except for the following points:
Fasteners must be appropriate screws.
Where butt joints are to be formed between framing,prepare back-blocking as per Back-Blocking details laterin this publication.
Where butt joints are to be formed between framing,prepare back-blocking as per Back-Blocking details laterin this publication.
Where butt joints on framing members are permitted,screw fix at 200mm maximum centres.
For a set finish, fasten ends of ceiling sheets at a maximum200mm centres.
For painted metal framing, one-third spacing must beused. Refer to Table 7.
GYPROCK plasterboard lining
200mm min. 200mm min.
Correct spacing of fasteners from adhesive daubs
GYPROCK plasterboard lining
Incorrect spacing of fasteners from adhesive daubs
Fastener too close to adhesive daub
Fastener through adhesive daub
FIG 12: ADHESIVE/FASTENER PLACEMENT
CORRECT METHOD
INCORRECT METHOD
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Gyprock Residential Installation Guide22
1200mm
900mm
900mm sheets 5 nails or 4 screws
1350mm sheets 7 nails or 5 screws
1350mm 7 nails or 5 screws 6 nails or
4 screws
8 nails or 6 screws
1200mm sheets 6 nails or 4 screws
FIG 13: FULL FASTENER FIXINGTO TIMBER OR METAL FRAMING
Fastener Installation The fastener installation method may be used on walls andceilings in interior and exterior applications. The fastenersare nails or clouts for timber joists, and screws for timber orsteel joists and battens, as detailed in Table 6.
Fasteners are to be driven home with the head slightly belowthe surface of the sheet, but not punched through the face
linerboard. Care should be taken to avoid damaging theface or core of the plasterboard. Fasteners are to be spacedevenly across the width of each sheet and in accordancewith Table 8.
TABLE 8: FULL FASTENER FIXING MINIMUM NUMBEROF FIXING POINTS PER FRAMING MEMBER
ApplicationBoard Width
(mm)
Number of Fixing Points
Screws Nails
Walls
900 4 5
1200 4 6
1350 5 7
Ceilings
900 4 6
1200 5 7
1350 6 8
Note: In timber framing, double nails at 50 75mm apartmay be used in lieu of screws.
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Gyprock Residential Installation Guide 23
Full Fastener Fixingto Timber or Metal FramingFor walls and ceilings:
Sheets are to be held firmly against the frame while drivingappropriate screws or nails. Commence fastening from thecentre portion of the sheet, proceeding to the ends andedges. Alternatively, start at one edge and work acrossthe sheet to the other edge.
Screws are to be driven at a 400mm maximum centreson walls and 300mm maximum centres on ceilings. Nailsare to be driven at 240mm maximum centres on walls and200mm maximum centres on ceilings. Outer fasteners areto be placed 10 to 16mm from sheet edges.
Where butt joints are to be formed between framing,prepare back-blocking as per Back-Blocking details laterin this publication.
Where butt joints on framing members are permitted,nail at 150mm maximum centres or screw fix at 200mmmaximum centres.
Fix internal and external corners at 300mm maximumcentres with fasteners opposite each other.
For a cornice finish, fix ends of ceiling sheets at a maximum300mm centres.
For a set finish, fix ends of ceiling sheets at a maximum200mm centres.
When fixing to resilient furring (N581), ensure screws donot contact supporting joists.
1200mm 1350mm
900mm
900mm sheets 5 nails or 4 screws and 1200mm sheets 6 nails or 4 screws
1350mm sheets 7 nails or 5 screws
8 nails or 6 screws 7 nails or
5 screws 6 nails or 4 screws
Fix ends at 200mm max.cts for set finish or 300mm max.cts for cornice finish
300mm max.
Where permitted, butt joints may be fixed on framing with nails at 150mm max.cts or screws at 200mm max. cts
FIG 14: FULL FASTENER FIXING TOBATTENED FRAMING (TIMBER OR METAL)
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Gyprock Residential Installation Guide24
Masonry WallsDescription.
The Gyprock plasterboard may be used to line dry masonrywalls to provide an alternative to cement render and setplaster finishes. Gyprock plasterboard can be laminated
directly onto the masonry, including concrete blocks, claybricks and calcium silicate bricks, using Gyprock Masonry
Adhesive (in WA, Gyprock Drywall Masonry Adhesive 100).
Joint treatment as detailed in the jointing systems sectioncreates a smooth flush surface ready for decoration.
Design Considerations.Lining masonry with plaster is an alternative to solid plaster,not a means of isolating dampness. The adhesive fixingmethod must not be used where walls are to be tiled or walls
are over 3m high.Services should be installed prior to the Gyprock plasterboard linings being fixed. All wall fixtures mustbe fastened to the masonry wall, with additional daubsof adhesive around the fixing to avoid distortion of theplasterboard.
Control joints are to be installed in the following locations:
To correspond with control joints in the masonry
Where plasterboard abuts any structural element ordissimilar wall assembly.
In long wall runs, at not more than 12m centres.
Between floor levels, e.g. in stairwells.
When lining a true wall surface, an allowance of about 5mmshould be made for adhesive thickness.
Installation All new masonry surfaces must be allowed to dry out to
normal levels before installation of Gyprock plasterboard.Masonry surfaces are to be firm, clean, and free of dust,oil, etc. For painted masonry walls, locally remove paintwhere adhesive is to be placed.
Establish the basis of a true wall plane before commencing
installation. Levelling pads are to be used whereirregularities in wall surface exceed 15mm. Plasterboardsheets can be fixed horizontally or vertically.
Daubs of Gyprock Masonry Adhesive can be applied tothe wall surface or to the back of the sheets. Hold sheetsin position until adhesive sets by using temporary masonrynails.
Gyprock Masonry Adhesive is a setting type plaster. Donot use the mix after setting or hardening has commenced,and mix only a sufficient quantity to ensure its working
properties are maintained. Check alignment of the wall with a straight edge to establish
the wall alignment. Strike a chalk line on ceiling and floorfor use as a guide to align the face of the Gyprock plasterboard.
When applying adhesive daubs to the wall, mark the wallwhere the sheet edges fall to keep daubs 50mm awayfrom the edges of the sheet. Measure and cut the sheetsto fit horizontally or vertically, allowing 6mm clearance attop and bottom.
Stagger Butt Joints a minimum of 900mm. Mix theMasonry Adhesive to a fairly thick consistency. If the wallalignment is flat and true, using a 75mm broadknife, applydaubs of adhesive at 50mm from all sheet edges andat 460mm maximum centres vertically and horizontally.Daubs may be applied to the wall or to the back of thesheet, and should be approximately 50mm diameter andminimum 15mm thick. If the wall is out of alignment by upto 15mm, bigger daubs must be used.
Additional daubs must be applied at butt joints, externalangles and around power points, plumbing fixtures, doors,
windows and skirtings. Position boards and use a straight edge to tamp the
boards into alignment both vertically and horizontally. Holdsheets in position for at least 80 minutes to allow adhesiveto set with temporary masonry nails through sheet edges.If necessary, use temporary blocks or props to the field of the board.
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Gyprock Residential Installation Guide 25
50mm
50mm
230mm max.
460mm max.
6mm gap
GYPROCK plasterboard
GYPROCK plasterboard
GYPROCK plasterboard
Daubs of Gyprock Masonry Adhesive
FIG 15: ADHESIVE FIXING TO MASONRY HORIZONTAL SHEETING
230mm max.
50mm
50mm
460mm max.
GYPROCK plasterboard
GYPROCK plasterboard
Daubs of Gyprock Masonry Adhesive
6mm gap
FIG 16: ADHESIVE FIXING TO MASONRY VERTICAL SHEETING
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Gyprock Residential Installation Guide26
Curved Walls ApplicationsGyprock plasterboards of 10mm or greater thickness maybe used on curved walls where the radius of the curve is900mm or greater, as detailed in Table 9.
Where a radius tighter than 900mm is to be used, the wallshould be sheeted with Gyprock Flexible Plasterboard.Refer to Table 10.
Framing PreparationPrepare the curved framing in accordance with Table 9 or10 and FIG 17, 18, 19, 20 or 21 appropriate for the chosenplasterboard and curving radius. For small radius curves,install double studs at each end of the curve to preventframe deflection.
Rondo Flexi-Track makes the job of preparing curvedwalls considerably easier, and is available in 0.55mm BMT for general use, and in 0.75mm BMT for deflection headapplications.
Alternatively, track may be shaped from timber or cut fromsheet materials.
Ensure that all framing members to receive sheeting arecorrectly spaced and aligned for the application.
Plasterboard FixingGyprock plasterboards may be attached vertically orhorizontally, depending upon the framing support andapplication, however, wherever possible sheets should be
installed with horizontal recess joints as this considerablyimproves the ease of jointing.
Two lay er s of Gy pr ock Flexible Plasterboard arerecommended, and they can easily be flush jointed to onelayer of 13mm Gyprock for adjacent straight sections whereappropriate.
When planning the sheet layout, ensure that the sheet edgesof the first and second layers are staggered at least 200mmto avoid aligned joints.
Sheets should begin and end a minimum of one stud from
the curved section, and more if possible.Curved walls must be fastened to all studs at 100mmmaximum from the top and bottom of the wall (but notthrough tracks) and at 400mm maximum centres between.For radii less than 900mm, refer to FIG 17, 18, 19, 20 or 21.
All butt joints must fall on framing members, be screw fixed at200mm maximum centres, and be staggered by a minimum of 600mm between adjacent sheets.
Plasterboard Jointing & Finishing
Jointing and finishing of curved walls is in accordance withnormal practice.
In multi-layer systems, jointing and finishing is required on theouter layer only, on each side of the wall.
Note: Under some lighting conditions, glancing light mayhighlight the plasterboard joints. This is more apparent withvertical sheeting. A skim coat to the entire plasterboardsurface is recommended to reduce this effect.
Rondo Flexi-Track
FIG 17: FRAMING PREPARATION FOR CURVED WALLS
See Table 9 and 10 for maximum
stud centres
Minimum curving radius for Rondo Flexi-Track .Track MinimumDepth Radius76mm 230mm92mm 280mm150mm 475mm
TABLE 9: CURVING RADII AND MAXIMUM STUD CENTRES FOR 6.5, 10 AND 13MM GYPROCK PLASTERBOARDS
Plasterboard
Thickness
(mm)
Gyprock
Flexible
Plasterboard
Gyprock Plasterboard CD and Flexible Plasterboard ONLY All Gyprock Plasterboards
Except
Perforated & Soundchek
Curved Radius (mm)
4000
Maximum Stud Centres (mm)
6.5 Refer Table 10 200 250 300 350 450 450
10 150 200 250 300 350 400 500
13 150 200 250 300 400 500
16 250 350
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Gyprock Residential Installation Guide 27
Wetting Flexible PlasterboardWetting plasterboard is usually not a recommended practice,however when conditions of low humidity and temperaturesoccur, or an extremely tight radius is to be attempted, it may benecessary to roll on a small amount of water with a clean paintroller.
Only wet the surface of the plasterboard that will be incompression.
Allow 15 minutes for water to soak into the core beforeattempting to bend the board.
TABLE 10: MINIMUM CURVING RADII AND MAXIMUM FRAME SPACING FOR GYPROCK FLEXIBLE PLASTERBOARD
Sheets Installed Vertically Sheets Installed Horizontally
Applications Minimum Radius Max Stud Spacing Minimum Radius Max Stud Spacing
Concave 450mm 150mm 650mm 200mm
Convex 250mm 125mm 450mm 200mm
Notes Low temperature and humidity will reduce board flexibili ty.
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Gyprock Residential Installation Guide28
Concave Curves
When constructing a concave curve, astopping bead at one end/edge of thesheet is recommended for restraint, wherepossible.
Apply pressure to the unrestrained end/ edge of the sheet until it comes into contactwith framing members or substrate.
When the sheet makes contact withthe substrate it should be fixed with theappropriate fasteners, beginning at thestopped end and proceeding towards theunrestrained end/edge.
The second lay er jo ints should bestaggered at least 200mm from the firstlayer to prevent aligned joints.
Recessed edge of second layer
First layer and second layer staggered a minimum 200mm to prevent aligned joints
Recessed edge of first layer
Fasten both layers at max. 100mm centres at first frame outside curved area
Fasten both layers at max. 100mm centres at first frame outside curved area
Fasten both layers at top and bottom of each sheet but not through tracks
Concave Curved Area 650mm minimum radius
1 0 0 m m 1 0 0 m m
Use stopping bead at edge of sheet where possible
Use stopping bead at edge of sheet where possible
Outer sheet 6mm above finished floor level
No curve in this area No curve in this area
For small radius curves, install double studs to prevent frame deflection
For small radius curves, install double studs to prevent frame deflection
1 0 0 m m
First layer and second layer staggered a minimum 200mm to prevent aligned joints
Fasten both layers at max. 100mm centres at first frames outside
curved area
Recessed edge of first layer
Recessed edge of second layer
Fasten both layers at top and bottom of sheets on
all frame members
Use stopping bead at edge of sheet where possible
Outer sheet 6mm above finished floor level
1 0 0 m m
Concave Curved Area
450mm minimum
radius
No curve in this area
No curve in this area
FIG 18: CONCAVE VERTICAL SHEETING
FIG 19: CONCAVE HORIZONTAL SHEETING
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Gyprock Residential Installation Guide 29
Convex Curves
Attach one end/edge of the sheet tothe framing members or substrateby fastening at the appropriatecentres.
Beginning from the attached end/ edge, progressively work the sheetagainst the framing.
As the sheet makes contact withthe framing, fix the sheet with theappropriate fasteners.
The second layer joints should bestaggered at least 200mm from thefirst layer to prevent aligned joints.
Avo id placi ng more screws thanrecommended into the plasterboardface within the curved area.
1 0 0 m m
1 0 0 m m
First layer and second layer staggered a minimum 200mm to prevent aligned joints
Fasten both layers at max.100mm centres at start and finish of curve and at min.200mm from edge of curve
Fasten both layers at max.100mm centres at start and finish of curve and at min.200mm from edge of curve
Convex Curved Area 250mm minimum radius
Recessed edge of second layer
Recessed edge of first layer
N o c u r
v e
i n t h i s
a r e aN o c u r v e
i n t h i s a r e a
Fasten both layers at top and bottom of sheets but
not through track/plate Outer sheet 6mm above finished floor level
For small radius curves, install double studs to prevent frame deflection
FIG 20: CONVEX VERTICAL SHEETING
Convex Curved Area 450mm minimum radius
N o c u r
v e
i n t h i s a
r e aN o c u r v e
i n t h i s a r e a
1 0 0 m m
1 0 0 m m
1 0 0 m m
Recessed edge of second layer
Recessed edge of second layer
First layer and second layer staggered a minimum 200mm to prevent aligned joints
Recessed edge of first layer
Fasten both layers at max.100mm centres at start and finish of curve and at max.150/200mm from edge of curve
Fasten both layers at max.100mm centres at start and finish of curve and at max.150/200mm from edge of curve
Fasten both layers at top and bottom of each sheet
Outer sheet 6mm above finished floor level
For small radius curves, install double studs to prevent frame deflection
FIG 21: CONVEX HORIZONTAL SHEETING
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Gyprock Residential Installation Guide30
Control Joints The Gyprock Plasterboard Control Joint Part NP35 isdesigned to form expansion or control joints in Gyprock plasterboard walls and ceilings.
The control joint is located between the sheets and setover. The filament tape is then removed leaving a clean,well-formed joint.
Door frames extending from floor to ceiling constitutecontrol joints. For doors less than ceiling height, control
joints extending from both corners of the frame to ceilingmay be used.
Control joints are to be installed:
In long partition or wall runs, at no more than 12mcentres.
To coincide with control joints in the supporting frame. The continuity of Gyprock plasterboard and supportframework should be broken at control joints.
In continuous interior ceiling areas, spaced at no morethan 12m centres in both directions. Control joints maybe positioned to intersect light fixtures, heating vents andair diffusers.
Between floor levels, eg, in stairwells. Refer to FIG 22.
In exterior ceilings, spaced at not more then 6.0mmaximum centres in both directions.
At changes of framing type or direction
Control joints in cornice should coincide with control jointsin linings.
In tiled areas at 4.8m centres. Door JambsStandard Timber Jamb Install Gyprock plasterboard to finish flush with the side
of the opening stud.
The appropriate width door jamb is then installed to theside of the opening stud (with packing as required).
Architraves are then fitted over the junction of theplasterboard and the door jamb by fastening them throughto the opening stud.
Installation of Control Joint Allow a 15mm maximum gap between ends of Gyprock
plasterboard sheets.
Locate control joint, Rondo NP35, centrally in gap. Fastenflanges and Gyprock plasterboard sheets to frame at amaximum of 300mm centres.
Set over bead as for normal joint application using centrechannel ribs as screeding guides.
Finish the joint in the normal manner.
When the joint is dry, remove the filament tape.
RONDO P35 CONTROL JOINT
GYPROCK plasterboard
Timber Mould fixed through lower sheet only
Stud
Stud
Floor Joist
10mm gap
FIG 22: HORIZONTAL CONTROL JOINT
GYPROCK plasterboard
20mm max. gap
RONDO P35 Control Joint
Framing member in normal position (stud, joist, furring channel or batten)
Additional framing member
Finish surface as per external angles
FIG 23: CONTROL JOINT IN CEILING
FIG 24: PLASTERBOARD FINISHING AT TIMBER DOORJAMB
GYPROCK plasterboard wall lining Opening Stud
Architrave
Door Jamb
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Gyprock Residential Installation Guide 31
Back-BlockingJointsBack-blocking is a reinforcing system where pieces of Gyprock plasterboard are laminated to the back of thesheets, behind joints.
Back-blocking is to be used on all butt joints formedbetween framing members and on recessed jointswhere indicated. See requirements in Table 2 .
Where mid-span butt or end joints are not required but areused to minimise plasterboard wastage, these joints mustalso be back-blocked.
All mid-span joints must be positioned within 50mm of themid-span point between the framing members.
Fix back-blocks with Gyprock Back-Blocking Cement,
Base Coat or Cornice Cement applied with a notchedspreader to form beads 6mm x 6mm at approximately 20mmcentres over the entire face of the back-block.
Back-Blocking ofRecessed Joints on CeilingsBack-blocking is required in Level 4 and 5 Finishes wherethree or more recessed joints occur in a continuous ceilingarea.
Cut back-blocks of at least 200mm width and long enoughto fit loosely between the framing members.
Apply Gyprock Base Coat to the back-blocks witha notched spreader to form 6mm x 6mm beads atapproximately 20mm centres at right angles to the joint,over the entire face of the back-block.
Apply Gyprock sheets with the long edges at right anglesto joists or battens. Place back-blocks along the full lengthof the sheet edge. As soon as all the blocks are in position,install the adjoining sheet.
Back-blocks must be adhered in position before the jointsare finished. Back-blocks may also be applied by workingabove the ceiling after the sheets have been fixed.
Back-blocking cut to fit loosely between framing members
Recess joint
Plasterboard back- blocking at least 200mm width and centred over recess joint
Framing or battens
FIG 25: BACK-BLOCKING OFRECESS JOINTS ON CEILINGS
Back-Blocking of Butt Joints on
CeilingsWhere butt joints are positioned between framing members,the sheet ends are reinforced and depressed, forming arecess to allow jointing. The diagram illustrates how the butt
joint is supported and back-blocked.
Sheet ends should be neatly cut and butted togetherwithin 50mm of the centre line between the ceiling joistsor other main support members.
Bend sheet ends upwards using temporary battens andpacking such as nails to form a 2mm deep depression (as
illustrated). Reinforce the butt joint by back-blocking with Gyprock
plasterboard of at least 400mm width, placed between theframing. Back-block along the full length of the butt joint
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Gyprock Residential Installation Guide32
Rondo NB005 Battens to form recess
Battens at 300mm max.centres
400mm 100mm min. overlap at recessed joints
400mm
Back-blocking
GYPROCK plasterboard back-block
GYPROCK plasterboard ceiling
Joint 50mm max. off centre
BACK BLOCKING CEMENT, BASE COAT 45/60 or CORNICE CEMENT 45/60
Temporary batten Packer such as nail to produce 2 to 3mm depression of plasterboard
GYPROCK plasterboard back-block
2 to 3mm deep depression suitable for jointing
GYPROCK plasterboard ceiling
FIG 27: BACK-BLOCKING OF BUTT JOINTS ONCEILINGS
Step 1. Forming joint
Step 2. Ready for settingButt joint centred between framing members
Back-blocking 400mm minimum width and 50mm minimum overlap at recessed joints
Framing or battens
400mm min.
50mm min.
FIG 26: BACK-BLOCKING OFBUTT JOINTS ON CEILINGS
and overlapping the recessed joints by a minimum 50mm.Refer to illustration.
Fix back-blocks with Gyprock Back-Blocking Cement,Base Coat or Cornice Cement as described earlier.
Allow the adhesive to set for a minimum of 24 hours beforeremoving the temporary battens. A hollow formationsuitable for jointing remains, as i llustrated.
Alternatively, use Rondo B005 batten to form the recessas illustrated
Gyprock plasterboard
Cornice adhesive
Recess formed with Rondo NB005 Batten
Plasterboard fixed with 2 screws each side of joint
Backblocking
Tape and set formed butt joint as per normal Gyprock recommendations for recess joints
NOTE: Install screws to battens carefully.Collated screw guns may not be suitable.
FIG 28: BUTT JOINT CONSTRUCTION USING RONDO B005 BATTENS AND BACK-BLOCKING (TOP VIEW)
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Gyprock Residential Installation Guide 33
Back-Blocking of Butt Joints onWalls Sheet ends should be neatly cut and butted together
within 50mm of the centre line between the studs.
Nail strips of Gyprock plasterboard to the sides of thestuds to support the back-blocking over the full length of the joint. Position so that the face of the back-block willfinish 5mm to 9mm behind the stud face.
Cut back-blocking to fit neatly between the studs and fixby skew-nailing the edges back to the studs.
Apply Gyprock Back-Blocking Cement, Base Coat orCornice Cement to back-blocks as described previously.
Fix Gyprock plasterboard wall sheets in place.
Depress sheet ends at butt joint with battens andpacking such as nails to form a 2mm deep depression asillustrated.
Allow the adhesive to set for a minimum of 24 hours beforeremoving the temporary battens. A hollow formationsuitable for jointing remains, as illustrated.
GYPROCK plasterboard back-block set back 5 to 9mm from stud face and held with skew nail into stud
GYPROCK plasterboard wall lining
Joint 50mm max. off centre
BACK-BLOCKING CEMENT BASE COAT 45/60 or CORNICE CEMENT 45/60
Temporary batten
GYPROCK plasterboard back-block
2 to 3mm deep depression suitable for jointing
GYPROCK plasterboard wall lining
Strip nailed to stud to support back-block
Packer such as nail to produce 2 to 3mm depression of plasterboard
FIG 29: BACK-BLOCKING OF BUTT JOINTS ON WALLSStep 1. Forming joint
Step 2. Ready for setting
FIG 30: BACK-BLOCKING OF BUTT JOINTS ON WALLS(ALTERNATIVE METHOD)
GYPROCK plasterboard wall lining
Joint 50mm max. off centre
BACK BLOCKING CEMENT,BASE COAT 45/60 or CORNICE CEMENT 45/60
Temporary batten
GYPROCK plasterboard back-block
2 to 3mm deep depression suitable for jointing
GYPROCK plasterboard wall lining
Packer such as nail to produce 2 to 3mm depression of plasterboard
Temporary Gyprock Laminating Screws
Step 1. Forming joint
Step 2. Ready for setting
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Gyprock Residential Installation Guide34
JointingSystemsJointing and finishing of Gyprock plasterboard interiorinstallations is to be carried out in accordance with therequirement of Table 2 of this publication, and the followingdetails, so as to provide a smooth surface for decorating.
Stopping and external corner beads are to be applied to alledges subject to damage.
A Level 4 Finish is generally the accepted level of finish fordomestic construction (as detailed in AS/NZS2859.1) andrequires a three coat system, consisting of:
tape (or base) coat
second coat, and
finish (or topping) coat.
Jointing CompoundsGyprock jointing compounds are classified as eithersetting type or drying type. Setting type compoundsproduce stronger joints and reduce installation delays andshrinkage associated with drying-type compounds. They
are recommended for experienced trades people and havea defined setting time e.g. 45 or 60 minutes.
Setting type compounds are: Base Coat 20, Base Coat 45and Base Coat 60, Base Coat 90.
Additional coats may be applied over setting type compoundsonce they have gone hard (set), usually 40 minutes to anhour. A drying type compound must be used as a finish coat
and must be completely dry before sanding. This usuallytakes about 24 hours.
Drying type compounds are: Wet Area Base Coat,Jointmaster Topping, Pre-Mixed Total Joint Cement, Multi-Purpose Compound, Total Coat-Lite, Easy Finish, Easy Flow,and Pro-Lite Topping. These products are premixed, and
Total Coat-Lite is also available dry.
Drying type compounds will shrink and harden withevaporation of water. The joints must be allowed to set andappear completely dry before re-coating or sanding. Actualdrying times will be extended in low temperature and highhumidity conditions. Do not use a setting type compoundover a drying type compound. Note that Gyprock Wet
Area Base Coat sets very hard; apply accurately to avoidthe requirement to sand.
All compounds can be applied by hand or with mechanical jointing tools.
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Gyprock Residential Installation Guide 35
Jointing TapeGyprock Perforated Paper Tape has been developed toenable the preparation of strong joints and should be usedon all butt and recess joints where prescribed in Table 2.
Site Mixing Of Compounds The first step to achieving good jointing is proper mixing of
the compound.
Always use clean containers and mixing equipment ascontamination by previously set compound will acceleratesetting time.
Always use clean water of drinking quality.
Never mix different compounds together or mix oldbatches with new ones.
Follow mixing instructions printed on each bag.
Use compounds before the printed Best By date printed
on the packaging.
ImportantWhen setting type compounds are used during hot, dryconditions, rapid evaporation of water and increasedabsorption by the lining surface can prevent the compoundfrom setting correctly. This will result in the compound beingsoft and weak.
If jointing must be carried out under severe drying conditions,
use Base Coat 45 and mix only small quantities of compound. The compound should then be left standing for approximately15 minutes to ensure that it sets soon after application to the
joints. Additionally, depending on the severity of the dryingconditions, the surface of the area to be jointed may requirewetting with a brush before applying the compound.
Drying-type compounds should not be used when theinterior temperature is less than 10C.
Preparation
Fill any voids deeper than 4mm and gaps greater than 3mmwide with Base Coat and allow to dry before jointing. Allsurfaces must be free of dirt, oil or foreign matter that couldreduce bond.
TABLE 11: JOINTING SYSTEM SELECTION
Tape Coat Second Coat Finish Coat
Any of the following: Any of the following: Any of the following:
Base Coat 20 Base Coat 20*
Jointmaster Topping Coat
Pro-Lite Topping Compound
Pre-Mixed Total Joint Cement
Multi-Purpose Compound Total Coat
Easy Finish
Easy Flow
Base Coat 45 Base Coat 45*
Base Coat 60
Base Coat 90
Pre-Mixed Total Joint CementMulti-Purpose Compound
Base Coat 60*
Base Coat 90*
Pre-Mixed Total Joint CementMulti-Purpose Compound
Wet Area Base Coat Wet Area Base Coat
Total Coat-Lite Total Coat-Lite
Easy Flow Easy Flow
* Do not use a setting compound over a drying type compound.For protected exterior applications, use Wet Area Base Coat for tape and second coat, followed by a Gyprock Finish Coat.
TABLE 13: APPROXIMATE QUANTITIES PER 100m 2 GYPROCK PLASTERBOARD (HORIZONTAL SHEETING)^
Tape + Second Coats Approx Qty Finish Coat Approx Qty
Base Coat 20/45/60 16kg Jointmaster Topping Coat 8kg
Wet Area Base Coat 15kg Pro-Lite topping coat 7kg
Total Coat-Lite - Premixed 16kg Total Coat-Lite - Premixed 6kg
Total Coat-Lite 13kg Total Coat-Lite 5kg
Easy Flow 15kg Easy Flow 10kg
Pre-Mixed Total Joint Cement 17kg Easy Finish 8kg
Multi-Purpose Compound 17kg Pre-Mixed Total Joint Cement 8kg
Multi-Purpose Compound 8kg
^ Allow 20% more jointing material for vertical sheeting.
TABLE 12: JOINTING SYSTEM SELECTION TILED AREAS
Wall Tape coat Second Coat Finish Coat
Waterproof or water resistant Wet Area Base Coat Wet Area Base Coat Nil
Other areas
Base Coat 20Base Coat 45Base Coat 60Base Coat 90
Base Coat 20Base Coat 45Base Coat 60Base Coat 90
Nil
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Gyprock Residential Installation Guide36
JointingHand AppliedRecessed & Back-blocked ButtJointsCSR Gyprock recommends the use of curved trowels whensetting recessed and back-blocked butt joints. Under normalpressure, a curved trowel deflects enabling the preparation of flatter and more consistent joints. A 200mm curved trowel isrecommended for second coat application, while a 275mmcurved trowel is recommended for the finish coat.
Tape Coat.
Fill recess in plasterboard evenly and fully with compoundusing a 150mm broadknife.
Bed in Gyprock Paper Tape centrally over the joint andcover lightly with compound.
Cover all fastener heads and fill any surface damage withcompound.
Allow setting-type compounds (Gyprock Base Coat) toset for at least one hour, and drying type compounds toharden for 24 hours.
Second Coat.
When the tape coat is dry, apply a second coat, about170mm wide, finishing slightly above the board surface,and feather joint edges.
Cover fastener heads with a second coat of compound,laid in a different direction, and extending beyond the firstcoat by about 25mm.
Allow setting-type compounds to set for at least one hour,and drying type compounds to harden for 24 hours.
Finish Coat.
When the second coat is dry, apply a thin finish coat of topping compound centrally over the previous coat, about250mm wide.
It may be useful to soften the outer edges of the newlytrowelled compound with a damp water brush or spongebefore feathering the edges with the trowel.
Cover previously stopped fastener heads with a thirdcoat of compound, laid in a different direction, extendingbeyond the previous coat by about 25mm. Ensure thatthe edges of the compound are neatly feathered and thatthere are no trowel edge marks left in the final stopping.
Sanding.
Allow the finish coat of compound to dry, for at least 24hours. Sand smooth with 150 grit paper or cloth, or with220 grit sanding mesh. Avoid any heavy pressure whichmight scuff the linerboard.
Fill Recess
170mm approx.
250mm approx.
GYPROCK plasterboard (recessed edge)
2mm nominal build up
1.0mm minimum depth of compound
Paper tape
Finish with slight convex camber over joint
FIG 31: JOINTING OF RECESSED JOINTS
Caution: If previous coats of drying type compounds are notthoroughly dry before application of subsequent coats, imperfectionscan result from delayed shrinkage of the compound.
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Gyprock Residential Installation Guide 37
Butt Joints Formed on FramingTape Coat.
Apply a thin layer of compound over the joint, (filling anyrecess created by back-blocking methods).
Bed Gyprock Paper Tape and apply a thin coat of compound over the top of the tape. The compound mustbe spread approximately 120mm each side of the joint.
Second Coat.
When the tape coat is dry, apply a second coat of compound about 170mm wide to each side of the joint.
This should have a gradual convex camber over the jointsurface.
Finish Coat.
When the second coat is dry, apply a finish coat of toppingcompound centrally over the previous coat to form aneven camber over the joint about 250mm each side of the joint. Soften the outer edges of the compound with adamp water brush or sponge before feathering the edgeswith the trowel.
Sanding.
Allow the finish coat of compound to dry for at least 24hours. Sand smooth with 150 grit paper or cloth, or with220 grit sanding mesh.
Finished joints should have an even and slightly convexcamber from edge-to-edge as shown.
120mm approx 120mm approx
Fill Recess with cement,apply tape and cover
lightly with cement
170mm approx. 170mm approx.
250mm approx. 250mm approx.
FIG 33: PROCEDURE FOR JOINTING OF BUTT JOINTS
3mm typical build up
1.0mm minimum depth of compound
GYPROCK plasterboard (square edge butt joint)
Paper tape
Finish with slight convex camber over joint
FIG 32: JOINTING OF BUTT JOINTS FORMED ON
FRAMING
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Gyprock Residential Installation Guide38
Internal Corners Apply a tape coat to both sides of the corner, and bed in
the tape centrally over joint.
When the tape coat is dry, apply a thin coat of finishingcompound over the tape coat to a width of at least100mm, ensuring that the edges are well feathered.
When dry, sand smooth with 150 grit paper or cloth, orwith 150/180/220 grit sanding mesh.
Tape Coat
Paper Tape Finish Coat
CSR GYPROCK plasterboard
External Corners& Arch Beads Position external angle bead over the corner and sight it
to ensure straightness before fastening both flanges at300mm centres.
External corners and arch beads are finished with a threecoat compound system applied to the same specificationsas for joints. The finish coat should be at least 250mmwide each side of the corner.
When compound is dry, sand smooth with 150 grit paperor cloth, or with 150/180/220 grit sanding mesh.
Jointing Compound (3 coat system)
CSR GYPROCK plasterboard
External Angle Bead
FIG 34: PROCEDURE FOR JOINTING OF INTERNALCORNERS
FIG 36: PROCEDURE FOR JOINTING OF EXTERNALCORNERS
3mm typical build up
GYPROCK Plasterboard
External angle bead
FIG 35: JOINTING OF EXTERNAL CORNERS
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Gyprock Residential Installation Guide 39
Jointing withMechanicalTools
The use of mechanical tools to joint Gyprock plasterboardis becoming more popular, and used correctly, these toolscan significantly increase productivity by cutting the amountof time taken to finish a job. The Gyprock range of dryingtype compounds are designed for use when jointing withmechanical tools.
Easy Flow, Total Coat-Lite, and Total Coat-Lite Premixed,can each be used as a three coat system.
Jointmaster, Easy Finish and Pro-Lite Topping Compoundare for use in mechanical tools as finishing coats only.
Premixed compounds should be used directly from thebucket, but can, if necessary, be thinned down with water,used sparingly. Follow the instructions provided on theproduct packaging.
FIG 37: JOINTING OF RECESSED JOINT
Tape recessed joint
Apply third coat with250mm or 300mm box
Bed tape alonginternal corner
Roll internalcorner
Apply second coatwith 65mm finishingtool
Feather out secondcoat with 75mmfinishing tool
FIG 38: JOINTING OF INTERNAL CORNER
Apply second coatwith 200mm box
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Gyprock Residential Installation Guide40
ArchesGyprock plasterboard may be used to line arches in timberand metal frame construction and may be formed as semi-circular, segmental, elliptical or other profiles prepared bythe builder.
Arches are finished with arch bead and corner bead toreinforce the corners and maintain an accurate profile. TheGyprock Arch Bead is designed for use with all thicknessesof Gyprock plasterboard.
Frame Preparation The builder is to construct the frame to the selected profileusing minimum 12mm thickness particleboard/MDFtemplates, positioned flush with both faces of the wallframing.
Installation of Gyprock Plasterboard Apply Gyprock plasterboard with the recessed edges
horizontal to the main stud framing.
Ensure that butt joints do not occur over the arch or within200mm of the side of the arch.
Mark the profile of the arch on one side of the opening,allowing the wall sheet to project past the curved edge of the template and inner edge of the stud framing by thethickness of the plasterboard being used.
Cut the face sheet accurately, using a keyhole saw.
Square the profile across the opposite side before markingand cutting the other sheet.
Fix plasterboard to particleboard templates along cut-outedges with screws at 300mm centres or with a bead of stud adhesive.
Measure soffit and cut Gyprock plasterboard soffit stripto fit neatly between the face sheets and long enoughto reach 50mm minimum below springing line on bothsides of the opening. Cut reveal strips to fill sides of theopening.
Apply a 10mm continuous bead of Gyprock CorniceCement or Gyprock Base Coat to the back edge of theface sheets around the arch opening.
Position one end of the Gyprock plasterboard soffit strip
50mm minimum below the springing line and fasten at thespringing line. Press the strip into cement beads followingthe profile of the arch to ensure continuous contact.Dampen the soffit strip to facilitate bending if a sharp radiusis specified.
Fasten the other end at the springing line and support thesoffit strip with props if necessary. Ensure that the soffitsides are square to the wall face.
Where more than one length of soffit strip is necessaryand the ends are not supported by a template, supportthe joints with pieces of Gyprock plasterboard glued tothe back of the soffit strip.
Fit and fasten reveal strips where required and allow allstrip to set in position.
Installation of Arch Bead Bend the metal bead to suit the profile of the arch ensuring
the short, perforated leg of the bead is on the face of thewall and the long perforated leg is against the arch soffit.
Allow the arch bead to begin and end 150mm below thespringing line.
Fix arch bead at the springing line at one end, fit the beadto the arch profile fixing at maximum 300mm centres,finishing by fixing the other end at the springing l ine.
Fit and fix external corner beads to vertical reveals.
Joint FinishingRefer to Jointing External Corners.
50mm
Springing Line
Templates (optional)
Arch Bead
150mm min.
External Angle Bead
P30 ARCH BEAD
FIG 39: INSTALLATION OF AN ARCH
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Gyprock Residential Installation Guide 41
Cornice FixingGyprock Cornice is designed to provide an attractive finishat the junction of the wall and ceiling. It can be used onGyprock plasterboard, fibrous plaster or cement renderedsurfaces.
The cornice is composed of gypsum plaster encased in astrong linerboard.
Gyprock Cornice Cement 45/60 is formulated for adhesionof cornice to plasterboard surfaces. For material other thanplasterboard, such as fibre cement, plaster glass, cementrender, or highly absorbent surfaces, Gyprock Masonry
Adhesive is recommended. In Western Australia Gyprock Cornice Cement 60 may be used as an alternative.
Installation of 100 lineal metres of standard cornice requiresapproximately 12kg of cornice cement.
Installation To ensure equal projection on wall and ceiling surfaces,
measure down from the ceiling surface and mark lines onthe walls at; 55mm down for the 55mm cornice; 90mmdown for the 90mm cornice; and 75mm down for the75mm cornice.
Mark and cut the cornice to the actual length required.
All corner angles are to be mitred. When cutting mitres,use a cornice mitre box. Where butt joints are unavoidable,prepare ends so that they will accurately butt together.
Butter 10mm wide beads of cement along the full lengthof each back edge of the cornice and to each mitre andbutt joint.
Position the cornice accurately to the marked lines andwhere necessary hold cornice in position with temporarynails.
Clean off any surplus cement.
Straight stop the cornice and fill internal and external
mitres. Clean off residue with a damp water brush or sponge.
Allow to set before removing the temporary nails. and fillthe holes.
Apply a second coat of cement to the mitres and butt joints, and fill nail holes and any imperfections, then brushwith a clean water brush or sponge.
Important.
When cornice cements are used in hot, dry conditions, thewater in the mix can evaporate or be absorbed into the drylining surfaces. In this situation the cement will not set correctlyand will be lacking in strength.
Under severe drying conditions, mix only small quantities of
GYPROCK CORNICE
Hold Cornice in place with temporary nails
FIG 40: CORNICE INSTALLATION90mm
90mm
55mm 75mm 90mm
55mm 75mm 90mm
55 x 55mm (Available all states) 75 x 75mm (Available in Western Australia only) 90 x 90mm (Available all states)
Cove Cornice
90mm
90mm Classic Cornice
Tempo Cornice 90mm
90mm Concerto Cornice
75mm
75mm Symphony Cornice
105mm
10mm 12mm
ShadowSet
75mm
75mm
20mm
20mm
Jazz Cornice
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Gyprock Residential Installation Guide42
cement and allow to stand for 10 to 15 minutes to ensurethat it sets soon after application.
Butter cement to one length of the cornice only before installation.In addition, depending on the severity of drying conditions, thecontact surfaces may require dampening with a water brushbefore applying the cement.
The best adhesion is to unpainted plasterboard. Where
cornices are to be fixed to surfaces that are painted,additional preparation is required:
For low gloss acrylic paint, sand painted surfaces.
For high gloss acrylic or oil based paint, coat with a PVA adhesive such as Bondcrete.
Cornice Cement may not bond well to ceramic tiles. Whenfixing cornice to wall tiles and a plasterboard ceiling,additional strength is required. If possible, bond the corniceto plasterboard above the tiles, otherwise use screws ornails to the ceiling plasterboard. Gyprock Wet Area Acrylic
Sealant may be used to seal any gaps to the tiles. Supportcornice for 24 hours or until adhesive is dry.
DecorationInterior Gyprock plasterboard surfaces may be decoratedin any of a variety of finishes including flat, semi-gloss orgloss paint, wallpaper or vinyl, texture or stipple.
Roll coated paints generally have a greater coating thicknessand create a similar texture on both the plasterboard and the
jointing compounds.
No building material has an absolutely flat surface, andall that can be expected in practice is an appearance of flatness. The effect of glancing light on the appearance of flat surfaces is described in the CSIRO Division of BuildingResearch Report No. L8 (Revised Edition). This report clearlydemonstrates that surfaces which seem perfectly flat indiffuse light appear rough and uneven when light strikesnearly parallel to the surface.
Surface Preparation All joint stopping must be sanded smooth.
Remove all loose dirt and dust with a soft brush or drycloth.
Ensure that the joint treatment is thoroughly dry beforeapplying sealer or paint.
Wallpaper & Vinyl To enable removal of wallpaper an