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PLASTERBOARD INSTALLATION MANUAL

1. maximum 12m intervals in both directions max 6m for external ceilings at every change of lining material over construction joints in the substrate at every change of substrate material 200mm min from joint to edge of opening Figure 14 Room Layout Option 2 PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 19 USGBORAL gi PLASTERBOARD FIXING Plasterboard should preferably be applied to ceilings first and then to walls This will minimise sheet handling and damage PLASTERBOARD FASTENERS SCREWS FASTENING SYSTEMS Plasterboard should be fixed to framing using one of the following fastening systems e Combination of adhesive and fasteners e Screw fixed only e Nail fixed only GENERAL SCREW AND NAIL FIXING e Plasterboard sheets must be held firm against framing while driving fasteners e Screws and nails should be slightly overdriven to allow for stopping but should not break the face paper e Screws and nails should be positioned 10 16mm from sheet edges and ends e Screws should be selected from Tables 11 and 12 e Nails should be selected from Tables 13 and 14 e Screws used for plasterboard fixing must comply with AS 3566 Se f drilling screws for the building and construction industries Part 2 Corrosion resistance requirements TABLE 11 PLASTERBOARD SCREWS SCREW TYPE APPLICATION Wood timber only S Dienstes Steel BMT up to 0 75mm D Coes Steel BMT 0 75
2. FIXING CORNICE e Fix cornice to plasterboard walls and ceilings using lt USG Boral Cornice Adhesive with nails as temporary support for at least 20 minutes e f cornice is fixed to fibre cement linings thoroughly wet the fibre cement at cornice line to prevent premature Cornice Adhesive dry out and cracking at bottom edge e Apply 10mm bead of Cornice Adhesive to top and bottom cornice edges e All mitres and joints to be buttered with Cornice Adhesive e Fibrous plaster cornice must be thoroughly dampened along mitres prior to the application of Cornice Adhesive e Large cast cornices and ceiling roses may require mechanical or other supplementary fixing Refer manufacturers recommendations e Painted surfaces require scoring or abrading or both to provide an adequate key prior to the application of Cornice Adhesive and cornice e Cornice must be mechanically fixed around cupboards and onto timber beams e n hot and dry conditions take care to avoid premature drying of adhesive and subsequent loss of adhesion In these conditions surfaces may need to be slightly dampened e Refer to Garage and External Ceilings on page 28 for additional installation requirements in these areas Figure 79 Linear Cornice e When adhering cornice to masonry wall apply Cornice Adhesive to the back of cornice so that it does not squeeze out under the bottom edge MIXING CORNICE ADHESIVE e Only mix quantities of cornic
3. Semi lightweight Standard weight Semi lightweight Ultra lightweight Lightweight Lightweight Semi lightweight Standard weight Lightweight Lightweight Paint consistency PACKAGING 16kg bag 20kg bag 17L 28kg pail 18kg pail 17L 17kg pail 17L 22kg pail 18kg pail 20kg pail 20kg pail 8 1kg bag 18kg pail 18 9L 30kg pail 20kg bag PLASTERBOARD INSTALLATION MANUAL WORKING TYPE TIME 30mins Setting 70mins 45mins Setting 60mins 90mins Air Drying NA Air Drying NA Air Drying NA Air Drying NA Air Drying NA Air Drying NA Air Drying NA 6mins Setting 20mins Air Drying NA Air Drying NA Setting 60mins OCTOBER 2014 v EN NS JOINTING FINISHING HAND MECHANICAL 1ST COAT 2ND COAT COAT v v EE EE NNA TOOLS v Bo EC BID Ee SS TOOLS v S AA EI X Spray Roller SANDING Very Easy Very Easy Very Easy Easy Easy Moderate Moderate Moderate 59 USGBORAL gf JOINTING JOINTING TAPES Jointing tapes are used to provide reinforcement to plasterboard joints and angles USG Boral SHEETROCK Brand paper tape is a high strength special cross fibre paper tape possessing exceptional wet strength and resisting stretching wrinkling and tearing A wafer thin paper aids smooth finishing and the roughened surface produces a superior bond to jointing com
4. TABLE 17 MAX SPANS OF CONTINUOUS 308 FURRING CHANNEL mm WIND CLASS N2 WIND CLASS N3 CEILING LINING 450mm 600mm 450mm 600mm 1x10mm pbd 1340 1230 1270 1110 1x13mm pbd 1430 1270 1240 1090 2x10mm pbd 1080 990 1080 990 2x13mm pbd 1150 1080 1150 1000 Source Rondo Building Services TABLE 18 MAX SPANS OF CONTINUOUS 303 CYCLONIC BATTEN mm WIND CLASS N2 WIND CLASS N3 CEILING LINING 450mm 600mm 450mm 600mm 1x10mm pbd 1300 1200 1175 1084 1x13mm pbd 1267 1168 1154 1064 2x10mm pbd 1231 1118 1231 1118 2x13mm pbd 1179 1087 1093 1009 Source Rondo Building Services TABLE 19 MAX SPANS OF CONTINUOUS 301 BATTEN mm WIND CLASS N2 WIND CLASS N3 CEILING LINING 450mm 600mm 450mm 600mm 1x10mm pbd 1200 1200 1200 1120 1x13mm pbd 1200 1200 1200 1100 2x10mm pbd 861 782 861 782 Source Rondo Building Services PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 23 USGBORAL INTERNAL CEILINGS CONTROL JOINTS e Control joints must be provided in internal ceilings at max 12m centres in both directions Ceiling battens should be discontinued at control joint locations Control joints can be formed by fitting Rondo P35 Control Joint or plastic expansion beads that leave a neat clean and flexible joint see P35 Control Joint installation instructions on page 35 FIXING TO CEILINGS FIXING WITH COMBINATION OF ADHESIVE AND SCREW FASTENERS General Fixing No
5. 08 6226 9811 This Technical Information Guide is intended to provide general information and should not be used as a substitute for professional advice There are many variables that can influence construction projects which affect whether a particular construction technique is appropriate Before proceeding with any project we recommend you obtain professional advice to ascertain the appropriate construction techniques to suit the particular circumstances of your project having regard to the contents of this Installation Manual We recommend you use qualified tradespersons to install this system The technical information contained in this manual was correct at the time of printing Building systems details and product availability are however subject to change To ensure the information you are using is current USG Boral recommends you review the latest building information available on the USG Boral website For further information contact TecASSIST or your nearest USG Boral Sales Office 2014 USG BORAL All rights reserved The trademarks USG BORAL INNOVATION INSPIRED BY YOU Unispan Wet Area Board Soundstop Echostop Firestop Wet Area Firestop Impactstop Multistop Flexiboard Shaftliner Cove 55mm Cove 75mm Cove 90mm New York 90mm Sydney Cove 90mm Manly 75mm Cairo 2 Step 50mm Cairo 3 step 75mm Cairo 4 Step 100mm Linear 75mm QuietLiving BaseCote Lightweight Taping RediBase LiteFinish FinalCote TopCote
6. max ctrs adhesive has set Figure 34 Internal Corner both sheets floating e Cut the metal angle 10mm shorter than the wall height and fix the angle to the stud 600mm centres e Apply stud adhesive daubs at 200mm max centres to both sides of the angle e Fit the underlying sheet 1 fully into the steel angle e Fit the overlapping sheet 2 hard up against the underlying sheet Apply temporary fasteners or surface blocks for 24 hours until adhesive has cured 40mm 40mm Figure 35 Rondo P40 Angle PLASTERBOARD INSTALLATION MANUAL FRAMED WALLS CONTROL JOINTS Control or expansion joints are used to minimise potential stress and cracking in wall and ceiling linings due to structural movements or changes in temperature and humidity They can be formed by fitting the Rondo P35 Control Joint or plastic expansion beads that leave a neat clean and flexible joint Control joints should be installed In walls and ceilings at maximum 12m intervals in both directions max 6m intervals in external ceilings At every change of lining material Over movement joints in the substrate At every change in substrate material Provide horizontal control joints at mid floors in stairwells in multi storey buildings Plasterboard lining Rondo P35 control joint section Full height floor to ceiling openings can also form effective control joints Control joints should extend through cornice Installa
7. 1200 3600 4 32 8 64 12 96 17 28 21 60 25 92 30 24 34 56 38 88 43 20 86 40 129 60 172 80 216 00 259 20 4200 5 04 10 08 15 12 20 16 25 20 30 24 35 28 40 32 45 36 50 40 100 80 151 20 201 60 252 00 302 40 4800 5 76 11 52 17 28 23 04 28 80 34 56 40 32 46 08 51 84 57 60 115 20 172 80 230 40 288 00 345 60 5400 6 48 12 96 19 44 25 92 32 40 38 88 45 36 51 84 58 32 64 80 129 60 194 40 259 20 324 00 388 80 6000 7 20 14 40 21 60 28 80 36 00 43 20 50 40 57 60 64 80 72 00 144 00 216 00 288 00 360 00 432 00 2400 3 24 6 48 9 72 12 96 16 20 19 44 22 68 25 92 29 16 32 40 64 80 97 20 129 60 162 00 194 40 2700 3 65 7 29 10 94 14 58 18 23 21 87 25 52 29 16 32 81 36 45 72 90 109 35 145 80 182 25 218 70 3000 4 05 8 10 12 15 16 20 20 25 24 30 28 35 32 40 36 45 40 50 81 00 121 50 162 00 202 50 243 00 1350 3600 4 86 9 72 14 58 19 44 24 30 29 16 34 02 38 88 43 74 48 60 97 20 145 80 194 40 243 00 291 60 4200 5 67 11 34 17 01 22 68 28 35 34 02 39 69 45 36 51 03 56 70 113 40 170 10 226 80 283 50 340 20 4800 6 48 12 96 19 44 25 92 32 40 38 88 45 36 51 84 58 32 64 80 129 60 194 40 259 20 324 00 388 80 5400 7 29 14 58 21 87 29 16 36 45 43 74 51 03 58 32 65 61 72 90 145 80 218 70 291 60 364 50 437 40 6000 810 16 20 24 30 32 40 40 50 48 60 56 70 64 80 72 90 81 00 162 00 243 00 324 00 405 00 486 00 16 OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL En USGBORAL g MATERIALS DELIVERY HANDLING PLACING BILLETS AND STORAGE All billets are to be placed in proper vertical alignment
8. Apply askim coat of compound over tape e When dry apply a second coat of compound with the broad knife then finish with a 100mm corner finishing tool feathering beyond edges of first coat e Allow a minimum of 24 hours to dry longer in cold wet weather conditions e When thoroughly dry lightly sand to a smooth finish with sanding mesh or 150 220 grit paper depending on the sanding hardness of finishing compound used PLASTERBOARD INSTALLATION MANUAL LA 1 Apply base compound 2 Bed tape Y i F y 3 Apply second coat 4 Internal angle jointing system Figure 83 Stopping Internal Corners OCTOBER 2014 63 JOINTING EXTERNAL CORNERS External corners should be strengthened with perforated metal angles then jointed and finished with a three coat system Suitable metal angles include Rondo Corner Beads POI or P32 Installation e Cut metal angle to length and position so that the angle is both straight and in line with the wall surfaces e Fix with nails or staples at maximum 500mm centres along each face with nails opposite each other e Stop and finish with a three coat system as per jointing specification e Ensure that the first coat of compound covers approx 150mm of angle faces and is forced through the perforations e The second coat should extend approx 200mm from the corner e The final coat should extend approx 280mm from the corner with the edges
9. TO THE BOARD e Place plasterboard control joints over movement joints in om 10kg the substrate or structural elements and at every change 13kg of substrate material 16mm 16kg e Utilise floor to ceiling openings as control joints e Fit double studs or joists spaced slightly apart in the Loads applied at the head of a single 8 gauge high thread screw inserted o sufficiently to allow the parallel thread section of the screw to be in frame at control Joint locations refer Framed Walls contact with the full depth of the Fiberock lining Control Joints on page 35 WALLS ON BOUNDARY According to BCA external walls on or in close proximity to the boundary are required to be fire rated from the outside refer BCA for fire rating requirements USG Boral OutRwall lightweight external wall systems have been specifically designed for this application and are available in fire ratings up to FRL 90 90 90 For more information refer to www usgboral com outrwall ATTACHED DWELLILNGS Separating walls between attached dwellings must satisfy BCA fire rating and acoustic requirements USG Boral Partiwall lightweight separating wall systems have been specifically designed to suit Australian construction methods and are available in fire ratings up to FRL 90 90 90 and acoustic ratings up to Ry C 56dB For more information refer to www usgboral com partiwall PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 9 USGBORAL D
10. a height of 150mm min above vessel for the extent of the vessel where vessel is within 75mm of a wall and exposed surfaces below vessel lip Water resistant all exposed surfaces below vessel lip Water resistant junctions within 150mm above a vessel for the extent of the vessel Water resistant wall floor junctions for the extent of the vessel Waterproof tap and spout penetrations where they occur in a horizontal surface Insert baths Waterproof to 150mm min above lip of bath Waterproof entire shelf area supporting the bath lip incorporating a waterstop under the bath lip and project a min 5mm above tile surface Waterproof junctions within 150mm above bath or spa Waterproof tap and spout penetrations where they occur in a horizontal surface Walls adjoining other vessels ie sink basin or laundry tub Water resistant to a height of 150mm min above vessel for the extent of the vessel if the vessel is within 75mm of the wall Where vessel is fixed to a wall waterproof wall junctions for the extent of vessel Waterproof penetrations where they occur in surfaces required to be waterproof or water resistant Laundries and WCs N A Waterproof wall floor junctions Waterproof penetrations where they occur in surfaces required to be waterproof Bathrooms and laundries requiring a floor waste N A Waterproof wall floor junctions If a shower is included in a bath refer t
11. add powder to water and allow powder to soak before mixing Mix only enough compound for stated working time when using setting compounds Mix by hand or with a power mixer max of 400rpm mixing at higher speeds may draw air into the mix creating air bubbles Mix until a smooth workable paste has been achieved Avoid overmixing as this may accelerate setting and shorten the working life of the compound For setting compounds once setting has commenced the material cannot be remixed and should not be agitated or retempered by the addition of water The inclusion of other materials in the mix could impair the performance of the compound and is not recommended PLASTERBOARD INSTALLATION MANUAL JOINTING USG BORAL JOINTING COMPOUNDS USG Boral offers a wide range of jointing compounds suitable for a variety of application methods and requirements TABLE 29 USG BORAL JOINTING COMPOUNDS USGBORAL gg PRODUCT APPLICATION NAME EasySand 45 EasySand 90 BaseCote 45 Base BaseCote 60 Compounds BaseCote 90 Taping Compound RediBase Ultralightweight Total Lite Grey Lid Finishing Compounds LiteFinish FinalCote TopCote550 EasySand 5 All Purpose Compounds EasySand 20 All Purpose Premix Tuff Hide Level 5 Primer Surfacer Finish Diamond Veneer Finish Refer to Levels of Finish on Page 10 RELATIVE DENSITY Lightweight
12. days prior to application of stud adhesive STEEL FRAMING Steel framed plasterboard substrates must comply with AS 4600 Cold formed steel structures National Association of Steel framed Housing NASH Standard for Residential and low rise steel framing and AS 1397 Steel Sheet and Strip hot dipped zinc coated or aluminium zinc coated The framing must be assembled and installed in accordance with the manufacturer s instructions PLASTERBOARD INSTALLATION MANUAL LININGS LAYOUT e Carefully plan installation Sheets should be set out to ensure best coverage and to minimise butt joints and waste e Wall sheets should be applied horizontally if a level of finish of 4 or 5 is required Sheeting may be vertical if it covers the whole wall e Where possible sheets should run across doors and windows and be cut out after fixing The cut outs can be used to cover small areas e Full length sheets should be used where possible to eliminate the need for sheet end butt joints e Where sheet end butt joints are necessary they must be positioned between supports e Stagger butt joints on adjoining sheets and with those on opposite sides of the wall e Vertical joints should be kept a minimum of 200mm from the edge of openings e Ceiling sheets should be installed with the long edge at right angles to the direction of the support members Figure 13 Room Layout Option 1 e Provide control joints in walls and ceilings at
13. deflection End to end joints in Rondo furring channels and 301 batten should be made using appropriate Rondo joiners Leave 5 10mm gap between joined sections Stagger adjacent end to end joints between different framing members Figure 16 Direct Fixed Ceiling Furring channels Ceiling joists or bottom b cords of trusses m Im NM Ceiling EA Lining Figure 17 Furred Ceiling 22 OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL INTERNAL CEILINGS METAL FURRING CHANNELS AND BATTENS USG Boral recommends the following Rondo metal components for furred plasterboard ceilings 308 Furring Channel 303 Cyclonic Batten 301 Batten 226 Fixing Clip for fixing of 129 and 308 Furring Channels 394 Fixing Clip for fixing of 129 and 308 Furring Channels 304 Fixing Clip for fixing of 301 Batten 314 Fixing Clip for fixing of 301 Batten 138 Joiner 315 Joiner for 129 and 308 Furring Channels for 301 Battens Figure 18 Rondo Ceiling Components USGBORAL g Maximum spans of direct fixed continuous Rondo furring channels and battens are as follows TABLE 16 MAX SPANS OF CONTINUOUS 129 FURRING CHANNEL mm WIND CLASS N2 WIND CLASS N3 CEILING LINING 450mm 600mm 450mm 600mm 1x10mm pbd 2070 1900 1850 1630 1x13mm pbd 2060 1850 1810 1600 2x10mm pbd 1680 1530 1680 1525 2x13mm pbd 1650 1530 1650 1470 Source Rondo Building Services
14. following table TABLE 7 SIZE AND AVAILABILITY OF PLASTERBOARD LENGTH m PLASTERBOARD EDGE THICKNESS WIDTH MASS TYPE PROFILE mm mm 6 0 5 4 4 8 4 2 3 9 3 6 3 3 3 0 2 7 2 4 kg m Flexiboard RE 6 1200 NVQSWCT 4 1 1200 NVQSCT NVQSCT NVQSCT NVQSCT C NVQSCT NVQSCT NVQSCT NVQSCT 10 6 3 1350 NVQSCT QST NVQSCT NQSCT NVQSCT NVQSCT T T RE 900 W W W ee 13 1200 INVQSWCT NSCT I INVOQSWCT NQSCT NVQSWCT NVQSWCT NVQSWCT NVQSWCT 8 3 1350 NVQSWCT NSCT NVQSWCT NQSWCT 1200 NQSWCT NSW Q RE SE 10 6 3 1350 NQSWCT 900 WC Unispan RE 10 1200 NVQSWCT S NVQSWCT NVQSWCT NVQSWCT NQSWCT W QW 6 8 1350 INVQSWCT S NVSWCT NSWC NVQSWCT NWC W 1200 Q Q NVSWCT NVQSWCT NVGSWCT NVSWCT NVQSWCT 10 7 4 Wet Area Board RE 1350 NVQWCT Qs NVQSWCT S ST 13 1200 QSW NVQSWCT NVCW 9 6 10 1200 NVQSWCT NVQSWCT 8 2 Soundstop RE 13 1200 NVQSCT NQW 11 8 SHEETROCK 1200 NVQSWCT NVQSWCT NVQSWCT NVQSWCT NVQSWCT Brand RE 10 5 3 Wall Board 1350 INVQSWCT NVQSWCT NVQSWCT SHEETROCK 1200 NVQSWCT NVQSWCT NVQSWCT NVQSWCT N Brand RE 10 5 9 Ceiling Board 1350 NVQSWCT NVQSWCT 1200 NVQSWCT NVQSWCT NVQSWCT NVQSWCT RE 13 6 9 SHEETROCK 1 NVQSWCT Brand Standard 2 in RE SE 13 1350 NQ NQ 10 1200 NVQSWCT 10 Fiberock RE 13 1200 NVQSWCT 12 LEGEND Locations N NSW V VIC amp TAS Q QLD S SA W WA C ACT T NT Edge Profile RE Recessed Edge SE Square
15. for the number of screwing points across the sheet width TABLE 21 SCREW FIXING ONLY LAYOUT FOR CEILINGS SHEET WIDTH SCREW POINTS 900mm 4 1200mm 5 1350mm 6 Note Screw points should be equally spaced OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL INTERNAL CEILINGS a 1 m ENENE E O zZ Ee MM Stud adhesive daubs Figure 20 Combination adhesive and screw fixing to ceilings 1 3 fixing method r l mmu oO c0 00 111 0 ADA M Stud adhesive daubs M A Double screws Figure 21 Combination adhesive and screw fixing to ceilings conventional method Figure 22 Screw fixing only layout for ceilings PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 25 USGBORAL gy INTERNAL CEILINGS BACK BLOCKING BUTT JOINTS IN CEILINGS Back blocking is a reinforcing system designed to minimise Wherever possible avoid the need for butt joints by using cracking and deformation along recessed edge and butt joints full length sheets Back blocking consists of plasterboard panels adhered to the If sheets must be joined end to end then the joints must back of sheet joints Boral recommends the use of USG Boral fall mid span between framing members and be supported Back Blocking Adhesive or Cornice Adhesive by back blo
16. of compounds and jointing tape SETTING COMPOUNDS Setting compounds are plaster based and mainly used for bedding tape and basecoating They can be applied with either hand or mechanical tools and generally provide a stronger joint than air drying compounds AIR DRYING COMPOUNDS Air drying compounds are vinyl based premixed compounds that can be used for base coating and or top coating The use of air drying type compounds in hot and dry conditions reduces the risk of premature dry out associated with plaster based setting compounds Air drying compounds may require 24 hours drying time between coats depending on weather conditions Air drying compounds should not be applied when the interior temperature Is less than 10 C Application of plaster based setting compounds over premixed air drying compounds is not recommended Paper tape must be used when taping with air drying compounds STORAGE Compounds should be stored in a dry place above ground and protected from the elements and temperature extremes Storage in an unsuitable environment or once container or bag is opened can shorten the life of the product MIXING COMPOUNDS For best results OCTOBER 2014 Check the best before date on packaging to ensure compounds are fit for use Always use clean cold potable water and clean containers and tools for mixing Using dirty containers water tools may affect the setting time and set strength Slowly
17. penetrations doors and windows Alternatively a solid wall effect can be achieved by applying cornice or masonry adhesive to the entire back face of the sheets using a 15mm x 15mm notched trowel Keep sheets 6 10mm off the floor Place plasterboard and press firmly into position using a long straight edge to level the sheets vertically and horizontally Hold the sheets in position with props or temporary fasteners until masonry adhesive sets Once initial contact has been made boards should not be pulled back from the wall Once installed boards should not be disturbed for 48 hours ie no drumming or rattling of walls cutting of light switches or power points Avoid skinning of masonry adhesive in windy weather Avoid early removal of bottom packers USGBORAL FIXING TO IRREGULAR WALL SURFACES Wall surfaces with high low spots over 15mm or out of plumb by more than 15mm will need to be straightened with a series of levelling pads or by using furring channels Figure 48 Levelling pads PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 39 USGBORAL gf MASONRY WALLS INSTALLATION USING FURRING CHANNELS This installation method is particularly recommended for fixing to precast concrete panels Metal furring channels can either be direct fixed or clipped DIRECT FIXED CHANNELS e Use one of the following Rondo Recessed Furring Channel 333 42 x 19mm min timber battens e Pack
18. specification Wall lining Figure 41 Cornice Detail 1 unsupported Ceiling lining Rondo P40 perimeter support angle screw fixed to top plate 600mm max ctrs 100mm max from ends Screw fix pbd to angle 300mm max ctrs Cornice fixed as per the USG Boral specification A Figure 42 Cornice Detail 2 perimeter supporting angle Ceiling lining Provide min 90mm x 55mm nogging between ceiling members Screw fix pbd to noggongs 500mm max ctrs Cornice fixed as per the USG Boral specification Wall lining Figure 43 Cornice Detail 3 perimeter trimmers NOTE Wall lining n uil Ceiling lining Rondo P50 shadowline stopping angle Wall lining Figure 44 Shadowline Angle 1 Ceiling lining Rondo P50 shadowline stopping angle Wall lining Figure 45 Shadowline Angle 2 Ceiling batten or furring channel Ceiling lining screw fixed to end battens 150mm max ctrs Square set corner stopped as per Internal Corners page 63 Figure 46 Square Set Ceiling battens or furring channels are recommended for square set finish to minimise the risk of localised cracking PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 37 USGBORAL MASONRY WALLS GENERAL USG Boral plasterboard provides a dry alternative to cement render and solid plaster finishes over masonry walls Two common installation methods are e Fixing sheets directly to masonry usi
19. studs joists and battens does not exceed the limits specified in the relevant sections of this Manual e Maximum deviations in the bearing surface of the finished framing do not exceed the maximum tolerances allowed for the required Level of Finish refer Table 6 Framing Tolerances Where these tolerances are exceeded a suitable levelling system should be used e Noggings supporting services such as taps and cisterns do not protrude beyond the face of the framing e All openings are framed and ceiling perimeter battens are installed where required e Trimmers are installed where primary ceiling support members such as girders trusses and joists change direction within a room e All contact surfaces are dry clean and free from foreign materials such as oil grease and dirt e Plumbing and electrical services have been installed and do not protrude beyond the face of the framing e The area is weatherproof FIXING FACE REQUIREMENTS Minimum widths of framing member fixing faces are as follows TABLE 10 MINIMUM WIDTHS OF FIXING FACES mm FIXING FACE TYPE TIMBER FRAMING STEEL FRAMING Supporting a joint 55 32 Other 30 30 Plasterboard can be installed directly over existing linings if they are firm sound and sufficiently flat for the required level of finish ensure fixings are of sufficient length by allowing for the thickness of existing linings 18 OCTOBER 2014 TIMBER FRAMING Timber framing substrate
20. where required to achieve a true surface e Fix to masonry with suitable fasteners CLIPPED CHANNELS e Use one of the following furring channels and fixing clips Rondo 129 or 308 Furring Channel Rondo 237 or 239 Fixing Clips Rondo Betagrip BGO1 or BGO2 Fixing Clips e Set out fixing clips for vertical channels spaced at maximum 600mm centres and for top and bottom horizontal channels e Pack clips where required to achieve a true surface e Fix clips to masonry with suitable fasteners Fix plasterboard to furring channels using an appropriate method adhesive and fasteners or fasteners only then joint and finish in the normal manner q p Rondo 237 fixing clip Rondo 239 fixing clip vs BETAGRIP BGO1 BETAGRIP BGO2 Figure 49 Masonry fixing clips 40 Masonry wall Rondo sss recessed i4 furring channel fixed directly to wall 7 Figure 50 Fixing to furring channels fastened direct to wall Masonry wall Rondo 308 or 129 furring channels attached to wall with appropriate fixing clips Doo Figure 51 Fixing to furring channels clipped to wall Figure 52 Rondo Recessed Face Furring Channel 333 OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL WET AREAS REGULATORY REQUIREMENTS DEFINITION AND STANDARDS Wet area as defined in BCA is an area within a building supplied with water from a water supply system and includes bathrooms showers laundries and sanitary compartments
21. 00mm sheet Figure 31 Screw fixing to walls TABLE 23 SCREW FIXING ONLY LAYOUT FOR WALLS SHEET WIDTH SCREW POINTS FIELD SCREW POINTS SHEET END 900mm 4 4 1200mm 4 5 1350mm 5 6 Note Screw points should be equally spaced OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL FRAMED WALLS FIXING WITH NAILS ONLY Level 3 finish only e Space single nails at 240mm and double nails at 300mm max centres at sheet ends corners e Space nails at 50mm max centres where butt joints are allowed on a framing member Level 3 finish only e Double nails should be 50 75mm apart e Refer Table 24 and Figure 32 for min number of nailing points per framing member e Refer to General Screw and Nail Fixing on page 22 BUTT JOINTS IN WALLS Wherever possible avoid the need for butt joints by using full length plasterboard sheets If sheets must be joined end to end the joints should fall within 50mm of the mid span between framing members Butt joints greater than 400mm in length and less than 2m above floor must be back blocked with nom 400mm wide back blocking panels for the length of the joint Butt joints on opposite sides of the wall should fall between different framing members PLASTERBOARD INSTALLATION MANUAL 5 nails 900mm sh 6 nails 1200mm sl Figure 32 Nail fixing to walls single nails TABLE 24 NAIL FIXING ONLY LAYOUT FOR WALLS SINGLE NAILS SHEET WIDTH NAI
22. 2 00mm L jr Plasterboard laminating BMT Base Metal Thickness TABLE 12 SCREW LENGTH mm PLASTERBOARD LINING TIMBER METAL 1x10mm 25 25 1x13mm 30 25 2x10mm 40 30 2x13mm 50 40 Min 30mm W screws must be used for ceilings direct fixed to timber framing NAILS TABLE 13 PLASTERBOARD NAILS NAIL TYPE APPLICATION Gold Passivated amm LH Smooth Shank l Softwood Wall framing Gold Passivated armani LH Ring Shank Softwood Wall framing Galvanised Para comm LH Smooth Shank T n Hardwood Wall framing Galvanised LH Ring Shank PR softwood Wall framing USG Boral does not recommend nail fixing of ceiling linings TABLE 14 NAIL LENGTH mm SMOOTH SHANKED ANNULAR PLASTERBOARD NAILS RING SHANKED NAILS LINING SOFTWOOD HARDWOOD SOFTWOOD HARDWOOD 1x10mm 40 30 30 1x13mm 40 30 30 2x10mm 50 50 2x13mm 65 50 z 20 OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL En USGBORAL INTERNAL CEILINGS CEILING LOADS AND SPANS Plasterboard spans and loads directly supported on ceiling linings must not exceed the maximum values indicated in the following table TABLE 15 MAXIMUM LOADS AND SPANS FOR INTERNAL CEILINGS MAXIMUM TOTAL LOAD FOR GIVEN WIND CLASS kg m PLASTERBOARD TYPE SPAN mm N1 N2 N3 N4 10mm SHEETROCK Brand Ceiling Board 600 max 2 6 2 6 2 0 2 0 138mm SHEETROCK Brand Standard 450 2 6 10mm Unispan 600 max 2 0 13
23. 550 All Purpose Premix TecASSIST PremiumBond Wet Area Sealant Wet Area Taping Cement Wet Area SealCote are trademarks or registered trademarks of USG Boral Building Products or one or more of its affiliates SHEETROCK FIBEROCK EasySand Durabond Ultralightweight Total Lite Grey Lid Tuff Hide Diamond are trademarks or registered trademarks owned by United States Gypsum Company and used under license BCC 11542 Octl4 www usgboral com BLA 150ct14
24. 6 2 x 10 mm mm C at temperature range 4 to 38 C Hygrometric Coefficient of Expansion 7 2 x 10 mm mm RH 5 to 90 RH THERMAL RESISTANCE The R values of some USG Boral products are provided in the following table TABLE 2 THERMAL RESISTANCE PLASTERBOARD TYPE R VALUE 10mm Regular plasterboard 0 056m K W 1096 13mm Regular plasterboard 0 073m K W 10 10mm Fiberock 0 038m K W 1096 13mm Fiberock 0 049m K W 10 FIRE RESISTANCE Plasterboard is deemed to be a non combustible material for the purposes of the Building Code of Australia BCA While plasterboard inherently possesses a certain degree of fire resistance due to the chemical composition of the gypsum core the following USG Boral products have enhanced fire resistance properties and are specifically formulated for use in fire rated construction e Firestop e Wet Area Firestop e Multistop e Fiberock e Shaftliner PLASTERBOARD INSTALLATION MANUAL USGBORAL gf FIRE HAZARD PROPERTIES Wall and ceiling lining materials in certain types of buildings must comply with the Fire Hazard Properties requirements of the BCA All USG Boral plasterboard lining products are classified as Group 1 least hazardous materials and have a smoke growth rate index less than 100 and average specific extinction area less than 250 m kg when tested in accordance with the BCA IMPACT RESISTANCE USG Boral offers a number of lining products speci
25. ANUAL WET AREAS PLASTERBOARD INSTALLATION MANUAL Figure 57 Waterproofing of bath Figure 58 Waterproofing of basin OCTOBER 2014 Refer Table 26 for minimum waterproofing requirements above bath lip 150mm min Waterproof min 40mm each side of joint or junction Water resistant wall lining 45 USGBORAL gf WET AREAS USG BORAL WET AREA SYSTEM USG Boral Wet Area System comprises materials and installation details outlined in this manual and must be installed in accordance with USG Boral specification to achieve the required performance USG Boral Wet Area System complies with the requirements of AS 3740 and is thus suitable for use in residential buildings and other buildings with a similar usage pattern USG Boral Wet Area System is not suitable for use in high exposure applications such as group shower rooms steam rooms etc WET AREA MATERIALS Wet Area Board USG Boral Wet Area Board is manufactured with a moisture resistant core that stops water wicking up the board causing damage to the board itself or to surface finish Wet Area Board can be recognised by its blue grey face liner and is manufactured with recessed edges for flush jointing within and outside of tiled areas Wet Area Board complies with water resistance requirements of AS 3740 Wet Area Board is available in TOmm and 15mm thicknesses Fiberock Fiberock is a water resistant paperless gypsum board offering a
26. According to BCA building elements in wet areas must be waterproof or water resistant depending on the location within a wet area and must comply with AS 3740 Waterproofing of domestic wet areas AS 3740 sets out minimum material design and installation requirements for waterproofing of wet areas within residential buildings and other buildings with similar usage intensity It also outlines typical wet area construction materials and methods For the purposes of AS 3740 water resistant plasterboard manufactured to AS 2588 Gypsum Plasterboard constitutes a water resistant substrate for tiles or other nominated water resistant surface materials Waterproofing membranes used in wet areas must comply with AS 4858 Wet Area Membranes WATERPROOFING OF WET AREAS Minimum waterproofing and water resistance requirements for walls in wet areas are outlined in BCA and are summarised in Table 26 and Figures 53 to 58 Where wall to wall junction is required to be waterproof waterproofing must extent a min 40mm either side of the junction For water resistant plasterboard sheeting all cut edges that have the potential to be affected by moisture must be waterproofed including the bottom edge over a preformed shower base All penetrations through wall linings in shower areas including penetrations of mechanical fasteners must be waterproofed USGBORAL gf WATERPROOFING MEMBRANES Waterproofing membranes complying with AS 4858 Wet
27. Area Membranes are deemed to be a waterproof material when used as part of a waterproofing system as outlined in AS 3740 Bond breaker must be installed at all wall floor hob wall junctions and at movement joints where the waterproofing membrane is bonded to substrate Bond breaker must be compatible with the flexibility of waterproofing membrane Types of waterproofing membranes and corresponding bond breaker widths are shown in the following table TABLE 25 WATERPROOFING MEMBRANES MIN BOND BREAKER WIDTH TO BRIDGE MEMBRANE ELONGATION JOINTS OPENING CLASS EXTENSIBILITY AT BREAK UP TO 5mm 75mm tape with Low 10 59 backing rod II Medium 60 299 35mm Hl High gt 30096 12mm CEILINGS OVER WET AREAS As BCA does not require the use of water resistant ceiling linings over wet areas SHEETROCK Brand Unispan or Regular plasterboard provide an adequate solution for this application Wet Area Board or Fiberock can be used in wet area ceilings if water resistant linings are desirable Ceiling linings over wet areas in residential buildings can be fixed as per the standard internal ceiling installation specification refer to page 21 Fiberock gypsum board must be fixed using screws only fixing method PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 41 USGBORAL g WET AREAS TABLE 26 WATERPROOFING OF WALLS IN WET AREAS VESSELS OR AREA WHERE THE FIXTURE IS INSTALLED Enclosed Showers with or withou
28. ESIGN CONSIDERATIONS LEVELS OF FINISH The term Level of Finish applies to plasterboard linings prior to decoration AS 2589 Gypsum linings Application and finishing defines three levels of finish 3 4 and 5 Level 4 is the default level of finish for plasterboard linings unless specified otherwise It is essential that the level of finish is determined at the design stage since each level has specific requirements for substrate tolerances and plasterboard installation jointing and finishing The desired level of finish may not be achieved unless all of these requirements are met through various stages of construction Levels of finish recommended for various lighting conditions and surface decorations are shown in Figure 5 For the full description of levels of finish refer AS 2589 A summary of various levels of finish is provided below LEVEL 3 This level of finish is used in areas that do not require decoration or where finish is not important for example above ceiling level or inside service shafts and the like All joints and interior angles must have tape embedded in the joint compound and one separate coat of joint compound applied over all joints and fastener heads Butt joints and recessed joints in walls and ceilings can be on framing members LEVEL 4 This is the default and generally accepted level of plasterboard finish All joints and interior angles must have tape embedded in the jointing compo
29. Edge 14 OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL MATERIALS DECORATIVE CORNICES Linear 75mm Cairo 3 step 75mm Manly 75mm Sydney Cove 90mm New York 90mm Cove 55mm Cove 75mm Cove 90mm Figure 9 USG Boral Cornices PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 15 USGBORAL g MATERIALS MATERIAL QUANTITIES Plasterboard coverage areas and approximate fixing and compound requirements are given in the following tables TABLE 8 FIXING AND JOINTING COMPOUNDS PER 100m of PLASTERBOARD WALLS CEILINGS FRAME SPACING 600mm 450mm 600mm 450mm FIXING METHOD Nails only 1250 1490 N A N A Nails and Adhesives maid i N A N A 2 9kg stud adhesive 4 3kg stud adhesive Screws only 910 1050 1010 1210 700 750 800 900 Screws and Adhesives 2 9kg stud adhesive 4 3kg stud adhesive 2 9kg stud adhesive 4 3kg stud adhesive JOINTING MATERIALS Tape 75m Base Compounds 16kg Finishing Compounds 8kg Conventional fixing method TABLE 9 BOARD COVERAGE AREA m WIDTH LENGTH NUMBER OF SHEETS mm mm 1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 2400 2 88 5 76 8 64 11 52 14 40 17 28 20 16 23 04 25 92 28 80 57 60 86 40 115 20 144 00 172 80 2700 3 24 6 48 9 72 12 96 16 20 19 44 22 68 25 92 29 16 32 40 64 80 97 20 129 60 162 00 194 40 3000 3 60 720 10 80 14 40 18 00 21 60 25 20 28 80 32 40 36 00 72 00 108 00 144 00 180 00 216 00
30. G Boral water resistant lining materials must b e be fixed to framing only with mechanical fasteners when used as a substrate for tiling Stud adhesives must not be used in tiled areas e be faced with ceramic tiles or other approved water resistant materials when installed in wet areas e only be applied to timber or steel framing or to a base layer of USG Boral water resistant lining material never to other types of lining materials Multiple layers of USG Boral water resistant lining materials must be fastened to framing individually e be jointed with paper tape e not be installed over a vapour barrier e not be used in high exposure areas such as group shower rooms or steam rooms e not be used in unprotected external applications e not be used if fractured or damaged Figure 71 Finished bathroom PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 53 USGBORAL CURVES AND ARCHES Curves and arches can be constructed using USG Boral Regular or SHEETROCK Brand plasterboard or for tight radii curves 6 5mm Flexiboard CONSTRUCTING CURVED WALLS AND CEILINGS The minimum bending radii for some USG Boral plasterboard products are as follows TABLE 28 BENDING RADII MINIMUM BENDING RADIUS FOR PLASTERBOARD FIXED HORIZONTALLY 650mm concave PLASTERBOARD TYPE AND THICKNESS 6 5mm Flexiboard 450mm convex 10mm Regular 900mm 13mm Regular 1000mm Shorter radii can be achieved by moistening the
31. GHT The effects of natural glancing light can be exaggerated by late afternoon or early morning sunlight as well as reflections from adjacent walls roofs and water features such as swimming pools canals and waterways Wall surfaces abutting tall narrow windows facing the sun or a reflecting surface are likely to be affected as will raked ceilings abutting clerestory windows and flat ceilings abutting window heads Where a building design cannot be changed the effects of glancing light can be minimised by using window shades soft furnishings curtains blinds and pelmets Avoid using dark high gloss paint finishes as they highlight glancing light problems instead use light matt finishes to minimise the effect Figure 6 Plasterboard surface under normal lighting conditions OCTOBER 2014 Figure 7 Same plasterboard surface under glancing light PLASTERBOARD INSTALLATION MANUAL MATERIALS The following USG Boral products are commonly used in residential construction PLASTERBOARD 10mm 13mm Regular 10mm SHEETROCK Brand Wall Board 10mm Unispan 10mm 13mm Wet Area Board 13mm SHEETROCK Brand Standard 10mm 13mm Fiberock 10mm 13mm Soundstop Figure 8 USG Boral Plasterboards PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 13 USGBORAL MATERIALS PLASTERBOARD SIZE AND AVAILABILITY Standard sizes and availability of select USG Boral plasterboard products are shown in the
32. ILE ULIS id Screw fixing max 400mm centres Screw locations fastened from plasterboard side Figure 26 Back blocking using stitching battens Plan view PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 27 USGBORAL GARAGE AND EXTERNAL CEILINGS GENERAL DESIGN NOTES Ceilings in garages carports verandahs and alfresco areas e The following USG Boral products are recommended are subject to more extreme loads and conditions than for lining of garage ceilings alfresco areas and other normal internal ceilings and require special attention to their external protected ceilings fixing and detailing 10mm SHEETROCK Brand Ceiling Board Some factors contributing to these extra loads include 13mm SHEETROCK Brand Standard e Wind loads 13mm Regular e Condensation 10mm Unispan e Roller door vibrations 13mm Wet Area Board e Insufficient perimeter support 10mm Fiberock e Exposure to atmospheric variations e Refer to Table 22 for maximum frame and screw ie humidity temperature etc spacings for external ceilings e Provide foil sarking and good ventilation to prevent heat build up and condensation pooling on the top of plasterboard e Provide a min 6mm wide gap between the edges of ceiling linings and adjacent walls beams columns and fascias e Fascia boards and perimeter beams should extend a min 25mm below plasterboard to provide a drip edge e Screws used for fixing of external ceiling lini
33. L POINTS IN FIELD NAIL POINTS AT SHEET END 900mm 5 5 1200mm 6 6 1350mm 7 7 DOUBLE NAILS SHEET WIDTH NAIL POINTS IN FIELD NAIL POINTS AT SHEET END 900mm 4 4 1200mm 4 5 1350mm 5 6 Note Nail points should be equally spaced OCTOBER 2014 33 FRAMED WALLS INTERNAL CORNERS The ends of plasterboard sheets at internal corners may be supported by one of two methods described below Where High Shrinkage timber is used refer page 18 the sheets must not be nailed screwed on either side of the corner and only Method 2 both sheets floating may be used Use a metal angle Rondo P40 to support sheet ends at internal angles with only one stud METHOD 1 BOTH SHEETS FIXED Internal Corner with 2 studs illustrated Both sheets of plasterboard fixed through to corner studs at 300mm ctrs max Corner studs Figure 33 Internal Corner both sheets fixed e Fit the underlying sheet 1 firmly into corner and fasten along the edge at 300mm max centres e Fit the overlapping sheet 2 with the edge firmly against the first sheet and fasten at 300mm max centres 34 OCTOBER 2014 METHOD 2 BOTH SHEETS FLOATING Internal Corner with 1 stud and metal angle illustrated Corner stud E r x LU Om m I ar Adhesive daubs to both sides of steel angle at 200mm ctrs Temporary fasteners in Steel angle overlapping fixed to sheet at 500m stud max ctrs 600mm Remove when
34. RBOARD INSTALLATION MANUAL OCTOBER 2014 29 USGBORAL gf EXTERNAL CEILINGS INSTALLATION OF EXTERNAL CEILINGS e Spacing between framing members should not exceed e Run plasterboard sheets at right angles to framing members the maximum values indicated in Table 22 In areas e Back block all joints in ceiling linings as per USG Boral where these values are exceeded suitable ceiling battens back blocking specifications or furring channels should be provided at required spacings Metal ceiling battens and furring channels should be installed in accordance with Rondo specifications Control joints must be provided in external ceilings at max 6m centres in both directions e External ceilings should be painted with a three coat exterior paint system including a sealer undercoat and applied in accordance with manufacturer s recommendations TABLE 22 MAXIMUM FRAMING AND FIXING SPACINGS FOR EXTERNAL CEILINGS e Ceiling linings should be fully screw fixed at maximum spacings indicated in Table 22 Refer Table 11 and 12 for screw types WIND CLASS CEILING LINING N1 N2 N3 N4 10mm SHEETROCK Brand Ceiling Board 13mm SHEETROCK Brand Standard MARTI es paang 450 450 300 300 10mm Unispan 13mm Regular 13mm Wet Area Board iin nn 300 300 250 200 10mm Fiberock E Ec gt Figure 28 Alfresco area 30 OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL En USGBORAL EXTERNAL CEILINGS Sarking Ti
35. USG BORAL INNOVATION INSPIRED BY YOU _ PLASTERBOARD INSTALLATION MANUAL www usgboral com PB105 OCTOBER 2014 USGBORAL gf CONTENTS Preface 3 Garage and External Ceilings 28 Introduction 3 Framed Walls 32 Standards 3 Masonry Walls 38 Plasterboard Linings 4 Wet Areas 41 Design Considerations 7 Curves and Arches 54 Materials 13 Cornices 56 Framing 18 Jointing 58 Linings Layout 19 Tools and Accessories 65 Plasterboard Fixing 20 Decorating Plasterboard Linings 67 Internal Ceilings 21 Contacts and Further Information 68 Figure 1 USG Boral Operations 2 OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL PREFACE USG Boral Building Products is a plasterboard and ceilings Joint Venture between USG Corporation and Boral Limited and is one of the leading players in this field Operating throughout Asia Australasia and in the Middle East USG Boral Building Products combines USG s innovative building products technologies with Boral s extensive plasterboard manufacturing and distribution footprint in Asia and Australia USG Boral Building Products is well positioned to service the Australian market through its manufacturing facilities in New South Wales Queensland and Victoria and Australia wide distribution network of around 100 company owned stores and independent resellers For more information on USG Boral Building Products refer to www u
36. Wet Area Sealant 6mm nom Floor tiles on mortar bed Optional flashing Figure 67 Set down shower base and wall junction Wall lining Ceramic tiles on approved Water Resistant lining ae 150mm min above lip if basin is within 75mm of the wall Vanity basin Nom 6mm flexible sealant relief joint South Australia 3mm flexible sealant relief joint at back of vanity top Figure 68 Vanity unit and wall junction PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 51 WET AREAS WATERPROOFING OF PENETRATIONS Use hole saw to make penetrations for taps shower nozzles and the like Waterproof cut edges of gypsum linings at penetrations by sealing with USG Boral Wet Area Sealant for the full depth of the board refer Figure 69 Alternatively plumbing penetrations can be waterproofed with proprietary waterproofing components refer Figure 70 Fastener penetrations must be waterproofed with two liberal coats of USG Boral Wet Area SealCote total dry film thickness about 1 0mm over USG Boral Wet Area Taping Cement 2 coats of SealCote 6 10mm Wet Area Sealant Water resistant lining Skim coat of Wet Area Taping Cement Figure 69 Plumbing Penetrations Sealed Proprietary waterproofing flange Water resistant lining Figure 70 Plumbing Penetrations With Proprietary Waterproofing Components 52 OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL En USGBORAL gf WET AREAS DO S AND DON TS US
37. ard constitutes acceptable method of protection for 10mm plasterboard in domestic installations 13mm Fiberock lining is approved by Energy Safe Victoria for use behind 5mm toughened safety glass splashbacks in non load carrying situations Refer splashback fire protection requirements by relevant state and Territory authorities ROOF SARKING Roof sarking can reduce the risk of condensation and also provides protection from the elements such as wind dust and rain Sarking is strongly recommended under tiled roofs in order to prevent ceiling damage due to rain blowback 8 OCTOBER 2014 ACOUSTICS Effective sound isolation is an essential element of functional house design Unwanted noise may emanate from external sources such as traffic or neighbouring properties or from internal sources such as home entertainment systems or plumbing Common design factors that can influence the level of noise within a house include e House orientation e Internal layout e Location of doors and windows e Placement of power points downlights and other services penetrations e Placement of plumbing and heating air conditioning services e Location of appliances and audio visual equipment The diagram below shows acoustic performance of some USG Boral wall systems Ry dB Twin stud timber framed wall 50 e on ve a canno 2x13mm Soundstop each side 48 Only some loud speech Staggered stud timber fram
38. ath rim and around penetrations Feather out across the surface of the board After Wet Area Taping Cement has dried min 24hrs hours waterproof all joints penetrations and fastener heads with two liberal coats of USG Boral Wet Area SealCote total dry film thickness about 1 0mm Refer to Table 26 and Figures 53 to 58 for the minimum requirements of waterproofing at joints and junctions PLASTERBOARD INSTALLATION MANUAL WET AREAS 1 Apply bedding coat of Wet Area 2 Bed in paper jointing tape in the corners 3 Bed in paper jointing tape at sheet joints Taping Cement 4 Apply skim coat of Wet Area Taping 5 Apply skim coat of Wet Area Taping 6 Apply skim coat of Wet Area Taping Cement at joints and around penetrations Cement to fastener heads Cement at sheet base m 7 Apply two liberal coats of Wet 8 Completed shower enclosure Area SealCote at all joints junctions penetrations and fastener heads Figure 62 Jointing and Waterproofing of Wet Areas PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 49 WET AREAS Timber stud Corner support angle Wet Area Taping Cement over jointing tape followed by two coats of USG Boral Wet Area SealCote min 40mm each side of corner prior to tiling Water resistant lining Water resistant lining For insert baths waterproof 150mm min above bath lip using skim coat of Wet Area Taping Cement and two coats of Wet Area SealCote Nogging Bat
39. ble base for paint and other decorative finishes TABLE 1 USG BORAL PLASTERBOARD PRODUCTS Figure 2 Plasterboard Line PLASTERBOARD TYPES AND APPLICATIONS USG Boral supplies a number of plasterboard types to suit various applications PLASTERBOARD TYPE THICKNESS APPLICATIONS SHEETROCK Brand Wall Board 10mm Lightweight wall linings SHEETROCK Brand Ceiling Board 10mm Lightweight ceiling linings SHEETROCK Brand Standard 13mm Lightweight wall and ceiling linings Regular plasterboard 10mm 13mm Wall and ceiling linings Unispan 10mm Ceiling linings Wet Area Board 10mm 13mm Tiling substrate in wet areas Soundstop 10mm 13mm Sound isolation between rooms Echostop 12 5mm Sound absorption within a room Firestop 13mm 16mm Fire resistant linings Wet Area Firestop 13mm 16mm Fire resistant linings in tiled wet areas Impactstop 10mm 13mm Impact resistant linings EIIESIODZ SS x are available Flexiboard 6 5mm Curved walls and ceilings Shaftliner 25mm Shaft enclosures and separating walls Fiberock paperless gypsum board 10mm 13mm 16mm Fire impact moisture and mold resistant linings OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL PLASTERBOARD LININGS PLASTERBOARD PROPERTIES DIMENSIONAL STABILITY Under normal ambient temperature and humidity conditions plasterboard has the following expansion properties Thermal Coefficient of Linear Expansion 1
40. ble in AL pails Corner Support Angle 40mm x 40mm galvanised metal angle Rondo P40 is used to support internal corners in wet areas It is available in 2 4m lengths PREPARATION OF WET AREAS Check framing for layout and fixing of additional noggings to support wet area fittings such as screens and taps and the continuous support for USG Boral water resistant linings at the shower base and bath rims Provide adequate noggings 25mm nominal above bath shower bases tubs and sinks for fixing the edges of USG Boral water resistant linings Ensure that plumbing pipes and noggings do not protrude beyond the face of the studs Recess preformed shower bases and baths into studs so that USG Boral water resistant linings can sit correctly in front of the shower base upstand This will provide a natural flashing point PLASTERBOARD INSTALLATION MANUAL WET AREAS INSTALLATION IN TILED AREAS USG Boral water resistant linings in tiled areas must be fixed using a full fastener system Adhesive is not permitted Space fasteners as per Table 27 and Figure 59 Sheets can be fixed horizontally or vertically with the bottom TABLE 27 FASTENER SPACING IN TILED AREAS WALL TILES WEIGHT MAX FASTENER SPACING INCLUDING TILE ADHESIVE INTERMEDIATE STUDS SHEET ENDS No greater than 12kg m 200mm 150mm Greater than 12kg m up to 32kg m max 100mm 100mm edge 6 10mm clear of the finished floor level or fixture e Lining sheet
41. cking panels nom 400mm wide for the length Australian Standard AS 2589 Gypsum Lining Application and Finishings requires back blocking of all butt joints in ceilings of the joint or between stitching battens see below Back Blocking Butt Joints Butt joints can be back blocked by forming a recess in the recessed joints in Level 4 finish ceilings in any room plasterboard face where the sheet ends meet using Rondo containing three or more recessed joints Stitching Batten or temporary wooden battens and packers all recessed joints in Level 5 finish ceilings 26 Figure 23 Rondo Stitching Batten BOO5 Nom 50mm Nom 300mm Nom 50mm Back blocking between stitching battens Rondo stitching batten fixed with 4 x S type screws Use USG Boral Back Blocking Adhesive or cornice adhesive Ceiling framing he Plasterboard lining Figure 24 Back blocking using Rondo Stitching Batten 3mm thick Back block packer strip ra USG Boral Ceiling framing Back Blocking Adhesive or cornice adhesive Temporary nailing Temporary nailing Plasterboard lining Temporary battens Figure 25 Back blocking using temporary batten and packer OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL INTERNAL CEILINGS Nom 400mm Nom 20mm gap typical Screw fixing 1 Rondo Stitching Batten fixed at max 300mm centres Max 300mm er E am oo E 1 Y L4 UT
42. compressed face of plasterboard When wetting the board apply a small amount of clean water with a paint roller or soonge Allow the water to soak for 15 minutes before attempting to bend the board To prevent flat areas between the studs space framing closer together than normal Refer relevant USG Boral publications for detailed instructions on fixing of Flexiboard plasterboard ARCHES Interior wall arches framed in timber or steel can be lined with Regular or SHEETROCK Brand plasterboard and the arch angles reinforced with Rondo Arch Bead P10 Straight corners below the arch line should be finished with standard corner bead Rondo P32 or POT Archway templates from min 12mm thick particleboard or MDF cut to the required profile must be in place before the installation of plasterboard sheets Installation OCTOBER 2014 Fix plasterboard sheets horizontally to studs on one side of the wall as per standard installation instructions Screw nail fix to templates and around the edge of the arch at maximum 300mm centres or use stud adhesive Keep fasteners 10mm min from the edge of the arch Do not place butt joints over or within 200mm of the arch Allowing a 10mm projection beyond the template accurately mark the profile of the arch on the back of the sheet Cut out neatly with a keyhole saw Fix sheets on the other side of the wall From the cut side square the line of cut across to the uncut sheet mark t
43. d For best results masonry walls should be coated with a bonding agent before applying masonry adhesive Masonry adhesive may be applied to either a wall or to the back of a sheet If gluing plasterboard to Autoclaved Aerated Concrete AAC then masonry adhesive should only be applied to the back of the sheet It is important to e Mix only enough masonry adhesive as can be used before it starts to set e Do not use masonry adhesive once it has started to set Additional daubs of masonry adhesive Allow 10mm gap 50mm min from edges Masonry wall Ribbon of masonry LER p mem use 50mm min from edges Plasterboard lining Figure 47 Fixing to a true wall surface OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL MASONRY WALLS MASONRY ADHESIVE METHOD INSTALLATION NOTES Strike chalk lines on the floor and ceiling as a guide for positioning sheets Allow for board and daub thicknesses Mark lines on the wall to assist in positioning the masonry adhesive daubs Masonry adhesive daubs should be about 50mm diameter by 15mm thickness Space adhesive daubs at maximum 450mm centres vertically and horizontally and 50mm from free edges and ends of sheets Ribbons or additional daubs of masonry adhesive must be applied at sheet ends and at cornice and skirting lines Additional daubs of masonry adhesive are also required at external angles fixtures and around services
44. dditional benefits of mold resistance and high impact resistance Fiberock contains 9596 recycled materials Manufactured with recessed edges for flush jointing Fiberock can be used as an alternative wall lining in USG Boral Wet Area System and can be installed using the same fixing jointing and waterproofing materials and details as specified for Wet Area Board Fiberock is available in 10mm 13mm and 16mm thicknesses 46 OCTOBER 2014 USG Boral Wet Area Sealant USG Boral Wet Area Sealant is a flexible acrylic sealant suitable for waterproofing e Wall junctions and cutouts e Bottom of sheets in shower bases or bath abutments e Around plumbing fixtures and penetrations USG Boral Wet Area Sealant complies with requirements of AS 3740 for waterproof materials USG Boral Wet Area Sealant Is available in 450g cartridges USG Boral Wet Area Taping Cement USG Boral Wet Area Taping Cement is used with paper tape for jointing of USG Boral water resistant boards in tiled areas USG Boral Wet Area Taping Cement is available in 3 2kg and 6 4kg pails USG Boral Wet Area SealCote USG Boral Wet Area SealCote is a water proof sealer that is used for waterproofing of wet area joints and junctions Two liberal coats of USG Boral Wet Area SealCote total dry film thickness about 1 0mm constitute a waterproofing membrane complying with the requirements of AS 4858 Wet area membranes USG Boral Wet Area SealCote is availa
45. e adhesive that can be used before setting commences e Use clean potable water and clean containers for mixing e Add cornice adhesive powder to water and mix to a usable paste e Avoid overmixing as this may accelerate setting e Addition of other materials to cornice adhesive could impair its performance and is not recommended PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 57 USGBORAL JOINTING Jointing and finishing of plasterboard should be carried out according to the required level of finish refer to Levels of Finish page 10 If no level is specified then Level 4 is the default level of finish for domestic construction It requires all joints and internal angles to be taped and coated as follows e Bed jointing tape into an initial coat of base compound e Apply a second coat of base compound to fill and level joints e Apply a coat of finishing compound The joint compound should be finished smooth and be free of tool marks and ridges Internal angles are to be completed with a two coat application Extreme care must be taken in jointing and finishing where walls or ceilings are subject to critical lighting refer to Glancing Light sections on pages 12 and 67 and to USG Boral publication Guide to Lighting and Decoration of Plasterboard JOINTING COMPOUNDS Jointing compounds broadly fall into two types setting compounds and air drying compounds The jointing system may consist of one or both types
46. ecoration of Flat Surfaces e FWCIANZ Glancing Light e USG Boral Guide to Lighting and Decoration of Plasterboard Take care when sanding and finishing joints and fastener heads to avoid scuffing the plasterboard surface adjacent to the jointed areas SURFACE PREPARATION Make sure the USG Boral plasterboard linings are dry and free of dust oil or greasy stains before decorating surfaces Correct visible surface variations with an approved filler PAINTING When painting plasterboard walls and ceilings follow the procedures set down by the Australian Standard AS 2311 The painting of buildings It is recommended that a coat of quality sealer undercoat be applied to the plasterboard surface prior to the application of subsequent coats of paint The chosen proprietary brand sealer undercoat should be formulated to fulfil the following functions e Equalise variations in porosity over the entire surface e Stop the migration or bleeding of chemicals from the substrate which could affect the appearance of the finishing coat e Conceal the difference in texture between the paper and the joints Figure 88 Glancing Light Situation PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 67 WARRANTY USG Boral warrants its products for 10 years from the date of supply of the product Refer USG Boral Warranty document for warranty conditions SUSTAINABILITY USG Boral aims to minimise the environmental impact of it
47. ed The work is finished with proprietary surface preparations or skim coating to remove differential surface textures and porosity A suitable paint or plaster material eg USG Boral Tuff Hide primer surfacer or Diamond Veneer Finish is sprayed rolled or trowelled over the defined area The surface texture must be random and monolithic concealing joints and fixing points OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL DESIGN CONSIDERATIONS FRAMING TOLERANCES Maximum deviations in the bearing surface of the finished framing prior to installation of plasterboard linings are as follows TABLE 6 FRAMING TOLERANCES mm FRAMING AREA LEVEL 3 LEVEL 4 LEVEL 5 90 of area 4 4 3 Remaining area 5 5 4 Deviation at any point of the bearing surface of the finished framing when measured with 1 8m straight edge refer AS 2589 WHAT IS THE FINAL DECORATION FINISH WALL COVERING NOT IMPORTANT WALLPAPER OR IS UNDECORATED OR TEXTURE FLAT MATT SATIN OR SEMI GLOSS LOW SHEEN PAINT OR GLOSS PAINT PASTEL OR MID TONES E CRITICAL AND CRITICAL AND NON CRITICAL NON CRITICAL LIGHTING NON CRITICAL LIGHTING LIGHTING LEVEL 3 FINISH LEVEL 4 FINISH LEVEL 5 FINISH Figure 5 Levels of Finish PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 11 USGBORAL DESIGN CONSIDERATIONS GLANCING LIGHT Glancing light is the light that shines across a surface rather than directly at it Glancing light ca
48. ed wall gt can be barely heard 2xl0mm Soundstop each side 45 e Must strain to Timber framed wall hear loud speech 2xl0mm Soundstop each side 7g o Loud speech can be Quiet Living wall system p Haie Slam incl Loud speech can be 35 x heard but not understood Standard timber framed wall p 30 e Loud speech can be heard easily 25 e Normal speech can be heard easily Figure 4 Noise Levels PLASTERBOARD INSTALLATION MANUAL USGBORAL DESIGN CONSIDERATIONS ATTACHMENTS CONTROL JOINTS A wide range of proprietary fixings are available for attaching Plasterboard linings are not designed to withstand stresses light fixtures directly to plasterboard linings Fixings should due to structural movements or excessive changes In be used in accordance with manufacturers instructions to temperature or humidity SUPPOTE ME IM EnNCE ee Potential stress build up and cracking can be minimised by Heavy loads must be fixed directly into the studs or noggings incorporating control joints as follows a EL e Provide control joints in walls and ceilings at maximum The following point loads can be supported directly by 12m intervals in both directions max 6m intervals in Fiberock linings external ceilings and at every change of lining material TABLE 5 MAXIMUM LOADS ON FIBEROCK e Proviae NONZONUA control igne at mid floors in stairwells in multi storey buildings FIBEROCK MAXIMUM POINT LOAD u ME THICKNESS PARALLEL
49. feathered out e Ensure that the final coat is built up to the corner e Allow a minimum of 24 hours to dry longer in cold wet weather conditions e When finishing compound is thoroughly dry light sand to a smooth finish with sanding mesh or 150 220 grit paper depending on the sanding hardness of finishing compound used Other beads and angles Shadowline Stopping Angle etc should be finished in the same manner 64 os eS aJa se ww ve te p AME o s 6 r e F oom E LAE E EHE 1 Cut angle and fix to sides of corner 300mm ctrs 3 Apply second coat to corner faces 5 External Angle Jointing system 2 Apply first coat to both corner faces 4 Apply third coat to corner faces Figure 84 Stopping external angles OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL En USGBORAL g TOOLS AND ACCESSORIES A wide range of plastering tools and accessories is available Stainless steel jointing tools are recommended for the best through USG Boral outlets including possible finish and service longevity e Power Tools Low cost plastic tools are also available and may be suitable e Fasteners where low cost or disposable tools are required e Joint Knives Tools should be cleaned in water before compounds have e Sanding tools fully set and stainless steel tools given a light rub with an oiled cloth to prevent rusting e Trowels e Mechanical jointing tools Plasterers trestles
50. fically developed for applications requiring enhanced impact resistance TABLE 3 IMPACT RESISTANT LINING PRODUCTS PRODUCT RELATIVE IMPACT RESISTANCE Multistop Moderate Multistop HI High Fiberock Very high MOISTURE RESISTANCE Although plasterboard is not a waterproof material USG Boral offers a number of lining products classified as moisture resistant under the BCA requirements for domestic wet areas These products include e Wet Area Board e Wet Area Firestop e Fiberock e Certain types of Multistop OCTOBER 2014 5 USGBORAL gf PLASTERBOARD LININGS SUSTAINABILITY RAW MATERIALS Gypsum used in locally manufactured USG Boral plasterboard products is mined from abundant resources at Kevin in South Australia The mine has in place a rehabilitation and revegetation strategy aimed at creating a landscape with natural appearance and native local vegetation Plasterboard paper liner is manufactured from 10096 recycled waste paper fibre and contains no virgin paper fibre Fiberock gypsum board contains 9596 recycled content PLASTERBOARD MANUFACTURE Apart from natural gypsum and recycled paper the key inputs in the plasterboard manufacturing process are natural gas and potable water All USG Boral plasterboard production facilities are certified under ISO 9002 Quality systems Model for quality assurance in production installation and servicing USG Boral aims at exceeding the local Environme
51. g practices FIRST AID e f plaster compound or dust comes into contact with the eyes wash eyes thoroughly with clean potable water e f plaster compound or dust comes into contact with skin wash skin thoroughly with soap and water e f dust is inhaled move to a fresh air environment e f plastering compound or dust is ingested drink plenty of water Material Safety Data Sheets for USG Boral products can be downloaded from www usgboral com In emergencies call 1800 033 011 For poison assistance call 13 11 26 PLASTERBOARD INSTALLATION MANUAL USGBORAL gf DESIGN CONSIDERATIONS When designing a house a number of factors need to be considered to ensure satisfactory long term performance of plasterboard linings CONDENSATION Condensation occurs when warm and humid air comes into contact with cold surfaces Condensation on internal building surfaces is more likely to occur where there are large temperature fluctuations and the moisture content inside a house often generated in a bathroom laundry or kitchen is high Repeat or prolonged condensation may lead to nail popping sagging ceiling linings rotting mould growth joint and corner cracking and deterioration of internal air quality If left untreated condensation may result in structural damage to the building and health concerns for the building occupants The following precautions can help minimise internal condensation e Keep air spaces wel
52. h edge Waterproof wall junction with shower base using skim coat of Wet Area Taping Cement and two coats of Wet Area Sealcote 6mm min 6 10mm USG Boral Wet Area Sealant Figure 63 Internal Corner Figure 64 Bath and wall junction Figure 65 Preformed shower base and wall junction OCTOBER 2014 Nogging Paper jointing tape Wet Area SealCote Flexible sealant relief joint 6mm nom Ceramic tiles on approved tile adhesive Ceramic tiles on approved tile adhesive Flexible sealant relief joint 6mm nom 6 10mm Wet Area Sealant Water resistant lining Ceramic tiles on approved tile adhesive Flexible sealant relief joint 6mm nom Preformed shower base PLASTERBOARD INSTALLATION MANUAL WET AREAS Water resistant lining we Ceramic tiles on approved tile adhesive Waterproof internal tray or membrane applied to wall face and floor by a tray or membrane installation contractor Backing rod and bond breaker tape Flexible sealant relief joint 6mm nom 6 10mm USG Boral Wet Area Sealant Floor tiles on mortar bed Optional flashing Figure 66 In situ shower base and wall junction Class membrane Water resistant lining Ceramic tiles on approved tile adhesive Waterproof internal tray or membrane applied to wall face and floor by a tray or membrane installation contractor Backing rod and masking tape Flexible sealant relief joint 6 10mm USG Boral
53. he curve and cut out neatly as before Cut a strip of plasterboard to fit into the arch soffit allowing enough length to reach 50mm below the springing line on both sides of the arch Apply continuous beads of cornice adhesive to the back edges of the wall sheets around the arch If the arch has a tight radius dampen the soffit strip to assist bending Fasten one end of the soffit strip 50mm below the springing line and bed the strip into the cornice adhesive progressively working around the arch Check that the soffit strip is installed neatly and tightly throughout the arch and fix the free end Cut plasterboard strips for the sides of the archway and fix using stud adhesive or fasteners Bend Rondo Arch Bead into position around the arch with the short leg on the face of the wall Allow a minimum of 150mm projection below the springing line at each end Fix one end of the arch bead at the springing line then fix around the remaining arch at maximum 300mm centres Fit standard external corner beads Rondo P32 or POT to the straight sides of the archway and fix at maximum 300mm centres Joint and finish as per standard methods PLASTERBOARD INSTALLATION MANUAL CURVES AND ARCHES Framing over opening as required 1 Template as required Springing line Rondo Arch Bead P10 fixed 500mm ctrs max Rondo External Corner Bead P32 or POI fixed o 500mm ctr
54. l ventilated to promote moisture dissipation especially in the roof and sub floor spaces e In rooms such as bathrooms kitchens and laundries exhaust moisture laden air to the outside of the building and not into the roof or ceiling space e Use vapour barriers in conjunction with insulation around the building envelope Place vapour barrier on the warm side of insulation e Use thermal breaks on steel framing members refer BCA Vapor barrier on warm side Insulation Brick veneer wall a Floor on stump construction VENTILATION Roof spaces and building sub floors should be well ventilated in order to prevent condensation and heat build up especially in metal framed buildings and dark coloured roofs without sarking Refer BCA for minimum ventilation and clearance requirements for sub floor spaces Ample air space is necessary for good ventilation in ceiling areas particularly below metal decks and tiled roofs with aluminium foil sarking USG Boral recommends ventilating unheated roof spaces above ceilings in cold or moderate climates by e Using louvres or other approved devices ie Whirlybirds to cross ventilate roof spaces e Ensuring any attic space suitable for use as a habitable room or walled off storage area has at least 50 of the required ventilating area located in the upper part of the ventilated space e Restricting the unheated space to as near the high point of the roof as pos
55. mber or steel battens Ceiling linin Screw fastener locations g Fasten cornice to timber beam Timber beam Edge Detail Refer Table 22 for max framing spacing Back blocking Figure 29 External Ceiling Fixing Layout 1200mm wide plasterboard sheets PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 31 USGBORAL gy FRAMED WALLS FIXING WITH COMBINATION OF ADHESIVE AND FASTENERS e Space daubs at 500mm max centres along the studs e Space screws or nails at 500mm max centres at sheet ends corners e Space nails at 150mm max centres or screws at 200mm max centres where butt joints are allowed on a framing member Level 3 finish only e Refer to General Screw and Nail Fixing on page 20 TEMPORARY FASTENERS Under normal drying conditions temporary fasteners nails or screws driven through plasterboard blocks to hold sheets in place while adhesive cures must be installed at every second stud and remain for at least 24 hours FIXING WITH SCREWS ONLY e Space screws at 300mm max centres at internal and external corners and around door and window openings e Space screws at 200mm max centres where butt joints fall on a framing member Level 3 finish only e Refer Table 23 and Figure 31 for wall fastener layout e Refer to General Screw and Nail Fixing on page 20 32 1200mm sheet Figure 30 Combination adhesive and screw fixing on walls 4 screws 900mm amp 12
56. mm Regular 450 2 6 10mm SHEETROCK Brand Wall Board 10mm Regular 450 max 2 0 10mm Wet Area Board Total Load includes weight of insulation and any fixtures directly supported on ceiling linings 1 3 Fixing method must be used if directly supported load exceeds 2 0kg m maximum load 2 6kg m Figure 15 Finished internal ceiling PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 21 INTERNAL CEILINGS CEILING SUPPORT OPTIONS There are two general support options for ceiling linings 1 Direct fixed where sheets are fixed directly to structural ceiling members If plasterboard is direct fixed to structural ceiling members trimmers are to be installed by the builder where primary ceiling support members such as girder trusses and joists change direction within a room 2 Furred or battened fixing where sheets are fixed to secondary framing members such as metal or timber battens or metal furring channels installed in the opposite direction to structural members Ceiling joists or bottom cords of trusses NOTES Experience has shown that metal battens or furring channels will generally produce a superior ceiling and it is the recommended method for use under trussed roofs subject to significant structural movements and for ceilings with square set finish Ceiling battens and furring channels should stop at least 10mm clear of non load bearing internal walls as not to impede truss or floor joist
57. ng USG Boral Masonry Adhesive e Fixing sheets over timber battens or metal furring channels fastened to masonry The batten furring channel method will allow a cavity space for services to run between the masonry wall and plasterboard as well as providing a true fixing surface and air flow ventilation It is essential that all new masonry surfaces be allowed to dry to normal levels before installing USG Boral plasterboards Masonry walls in wet areas such as bathrooms and laundries may be lined with Wet Area Board or Fiberock as per the wet area installation requirements refer page 41 Masonry walls should be checked for flatness and level using a straight edge or string line before determining the fixing method Masonry adhesive method should not be used for walls over 3m high or where the wall surface requires more than 25mm of packing to bring it back to a true line All services should be in place prior to plasterboard installation Butt joints control joints jointing and finishing should be as per standard practice 38 INSTALLATION USING MASONRY ADHESIVE METHOD Masonry walls must be dry and free from dust oil flaking paint efflorescence release agents or any other material or treatment that could adversely affect bonding of masonry adhesive Adhesion can also be affected by the porosity and or previous surface treatment of a wall Surfaces that are particularly dry or porous may need to be dampene
58. ng care sufficient compound is left under the tape to provide a strong bond After embedding tape apply a skim coat of compound over the paper tape SECOND COAT Allow sufficient time for the first coat of base compound to set before applying a second coat Apply a second coat of compound to each side of the joint approx 400mm total width Feather out joint edges The second coat should have a gradual convex curve FINISHING COAT 62 Ensure base coats are set and remove any rough spots or lumps Using a straight bladed trowel apply a coat of finishing compound to each side of the joint approx 500mm total width Feather out the edges The finished coat should have a slight convex curve Allow a minimum of 24 hours to dry longer in cold wet weather conditions When thoroughly dry lightly sand to a smooth finish with sanding mesh or 150 220 grit sand paper depending on sanding hardness of finishing compound used OCTOBER 2014 Figure 82 Stopping Butt Joints PLASTERBOARD INSTALLATION MANUAL JOINTING STOPPING CORNERS INTERNAL CORNERS Internal corners should be jointed with atwo coat system using paper tape Gaps in excess of Amm should be pre filled with a base compound Installation e Apply compound to both sides of internal corner using a 75mm broadknife e Measure and cut reinforcing tape fold along centreline and bed into corner using a 50mm corner taping tool e
59. ngs must comply with AS 3566 Se f drilling screws for the building and construction industries Part 2 Corrosion resistance requirements 28 OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL DD USGBORAL gf GARAGE CEILINGS INSTALLATION OF GARAGE CEILINGS e Ensure there are adequate perimeter noggings e A Rondo metal angle P40 could also be fastened to e Use the 1 3 Fixing Method as illustrated in Figure 20 the beam to provide concealed added support to the e Fasten along the perimeter lines 300mm max centres ceiling at the rear of the cornice as illustrated in Figure 27 e hicken cornice adhesive to avoid dribble on brick wall face e t is recommended that the lower portion of the cornice e When adhering cornice to masonry wall apply Cornice is fastened to perimeter timber beams Adhesive to the back of cornice so that it does not squeeze out under the bottom edge 300 max 300 max 500 max 500 max 400 max 400 max 400 max 4 Brick perimeter wall shown Screw fastener locations S Use W Type screws Nom 200mm o ee y Plasterboard adhesive daubs N Back blocking Noggings between ceiling members Ceiling framing members at max 600mm ctrs Nom 20mm gap typical Figure 27 Garage ceiling fixing layout 1200mm wide plasterboard sheets shown Perimeter Detail PLASTE
60. nt Protection requirements and at maximising the use of recycled water at its manufacturing facilities PLASTERBOARD RECYCLING Plasterboard waste can be recycled into new plasterboard or as soil conditioner For further information contact your local USG Boral office EMBODIED ENERGY As shown in the following table embodied energy per kg of plasterboard compares favourably with other lining materials TABLE 4 EMBODIED ENERGY OF LINING MATERIALS MATERIAL PER EMBODIED ENERGY MJ kg Plasterboard 4 4 Fibre cement 4 8 Particleboard 8 0 Plywood 10 4 MDF 11 5 Hardboard 24 2 PER Process Energy Requirements Source Building Materials Energy and the Environment Bill Lawson The Royal Australian Institute of Architects 1996 6 OCTOBER 2014 SAFETY The following precautions are recommended when installing and finishing plasterboard e Avoid creating dust when handling plasterboard or mixing jointing compounds e When sanding minimise the effects of dust by providing adequate ventilation wearing eye protection wearing a respiratory mask conforming to AS 1716 Respiratory protective devices using mechanical sanding tools fitted with dust extractor and storage bag e Keep tools and materials out of reach of children In addition the users should observe Occupational Health and Safety tips contained on the packaging labels for USG Boral products as well as safe manual handlin
61. o remove any rough spots or lumps Using a trowel apply a coat of finishing compound approx 250mm wide feathering out approx 50mm beyond edges of the basecoat Use a curved trowel on the finishing coat to produce a slight convex curve Feather out the edges Allow a minimum of 24 hours to dry longer in cold wet weather conditions When dry lightly sand to a smooth finish with sanding mesh or 150 220 grit paper depending on sanding hardness of finishing compound used PLASTERBOARD INSTALLATION MANUAL JOINTING 1 First coat Bedding compound 2 First coat Bed tape 6 Dry sanding 7 Total recessed joint system Figure 81 Stopping Recessed Joints PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 61 JOINTING STOPPING BUTT JOINTS Butt or end joints should be flush jointed and finished with a three coat system as for recessed joints For a flatter finish and to minimise surface build up of compound widen each jointing coat so that the final coat of the finished joint is about 500mm wide FIRST COAT Using a trowel apply a thin layer of base compound to each side of the joint approx 300mm total width prefilling any recess gaps at the joints Centre and press the paper tape into the base compound using a 150mm broadknife drawing along the joint with sufficient pressure to remove excess compound Ensure all air bubbles have been expelled taki
62. o the requirements for shower area walls and penetrations N A 42 OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL WET AREAS Shower panel sealed at all junctions Fixed shower screen Figure 53 Waterproofing of enclosed shower over bath Figure 54 Waterproofing of enclosed shower PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 Waterproof min 40mm each side of joint or junction Water resistant wall lining Refer Table 26 for minimum waterproofing requirements above bath lip 150mm min Waterproof min 40mm each side of junction Waterproof min 40mm each side of joint or junction Water resistant wall lining Refer Table 26 for minimum waterproofing requirements at wall floor junctions in shower areas 43 WET AREAS Refer Table 26 for minimum waterproofing requirements at wall floor junctions in shower area Waterproof min 40mm each side of joint or junction Water resistant wall lining Ad Figure 55 Waterproofing of unenclosed shower over bath Figure 56 Waterproofing of unenclosed shower OCTOBER 2014 Waterproof min 40mm each side of joint or junction Water resistant wall lining Refer Table 26 for minimum waterproofing requirements above bath lip 150mm min Waterproof min 40mm each side of joint or junction Refer Table 26 for minimum waterproofing requirements at wall floor junctions in shower areas PLASTERBOARD INSTALLATION M
63. or scaffolding should be used to ensure e Plasterers trestles and scaffolding correct working height aL Joint Knives hien Hand lools TAR Sf laleliale sr Figure 85 Plastering Tools and Accessories PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 65 USGBORAL TOOLS AND ACCESSORIES MECHANICAL JOINTING TOOLS The following recommendations apply to mechanical jointing tools in addition to the general Jointing and Finishing specification BANJO BOX Mud Machine Jointing compounds recommended for use in Banjo Box include USG Boral SHEETROCK Brand Taping Compound RediBase and longer setting compounds such as the SHEETROCK Brand EasySand 90 and BaseCote 90 Centre joint tape along the joint and using a broad knife press the tape down into the bedding compound With the broad knife held approximately at 45 degrees to the board surface draw along the joint with enough pressure to remove excess compound and any air bubbles sandwiched beneath the tape avoid dry spots under tape Banjo Box chaser follow up stopper should immediately follow to avoid dry out Ensure full width of recess Is filled Leave sufficient compound under the tape to achieve a good bond Immediately apply a skim coat of base compound This reduces the possibility of the tape edge curling or wrinkling which could lead to edge cracking especially in hot dry conditions FLAT BOXES 200mm 250mm or 300mm Automatic boxe
64. over bath lip must be protected by sealing with USG Boral Wet Area Sealant WATERPROOFING WALL JUNCTIONS Waterproof sheet edges above baths shower bases laundry tubs etc by sealing with USG Boral Wet Area Sealant for the full depth of the board refer Figure 60 Waterproof floor and wall junctions by sealing with USG Boral Wet Area Sealant for the full depth of the board refer Figure 61 Figure 60 Seal Sheet Edges Over Baths Shower Bases Laundry Tubs Figure 61 Seal Floor and Wall Junctions 48 OCTOBER 2014 JOINTING IN WET AREAS USG Boral water resistant gypsum linings in tiled areas should be jointed using USG Boral Wet Area Taping Cement and paper tape With a broad knife evenly fill joint recesses with USG Boral Wet Area Taping Cement and also apply to both sides of internal and external corners Centre reinforcement paper tape over joints internal and external corners and firmly bed into the USG Boral Wet Area Taping Cement ensuring there are no trapped air bubbles When the tape is embedded immediately apply a skim coat of USG Boral Wet Area Taping Cement with a broad knife ensuring the tape is completely covered with no tape curling at the edges Cover fastener heads with a skim coat of USG Boral Wet Area Taping Cement Following application of USG Boral Wet Area Sealant apply a skim coat of USG Boral Wet Area Taping Cement to the cut edges of gypsum linings adjoining the shower base b
65. pounds Centre creased for application to angles Paper tape is recommended by USG Boral for jointing of gypsum wall and ceiling linings due to its high strength and suitability for all jointing compounds and applications Paper jointing tape must be used in wet area and fire rated applications and with air drying type jointing compounds USG Boral SHEETROCK Brand jointing tape is available in 5m and 150m x 50mm wide rolls Figure 80 Paper Jointing Tape 60 OCTOBER 2014 STOPPING RECESSED JOINTS Recessed joints should be stopped and finished with a straight or curved trowel to leave a slightly convex camber over the joint FIRST COAT Fill recessed joint with a layer of base compound using a flexible 150mm broadknife Centre and press the paper tape into the base compound using a 150mm broadknife drawing along the joint with sufficient pressure to remove excess compound Ensure all air bubbles have been expelled taking care sufficient compound is left under the tape to provide a strong bond After embedding tape apply a skim coat of compound to fill the recess Spot fastener heads SECOND COAT Allow sufficient time for the first coat of base compound to set Apply a second coat of base compound approx 200mm wide using a trowel or broadknife Feather joint edges Spot fastener heads again extending beyond the first coat by approx 25mm FINISHING COAT Ensure base coats are set and scrape t
66. s e National Association of steel framed housing NASH standard for residential and low rise steel framing e AS 3566 Se f drilling screws for the building and construction industries e AS 1145 3 Determination of tensile properties of plastic materials Part 3 Test conditions for films and sheets e AS 1716 Respiratory protective devices e ISO 9002 Quality systems Model for quality assurance in production installation and servicing e AS 2311 The painting of buildings e AS 4600 Cold formed steel structures PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 3 USGBORAL gf PLASTERBOARD LININGS GENERAL Invented by USG more than 100 years ago plasterboard has become the most common dry lining material for walls and ceilings in modern building construction Manufactured on a continuous production line plasterboard is comprised of a specially formulated gypsum core encased between heavy duty paper liners Locally manufactured USG Boral plasterboard products utilise naturally occurring gypsum and 100 recycled paper Plasterboard sheets are commonly available in 200mm and 1550mm widths and have recessed longitudinal edges facilitating a smooth seamless joint finish USG Boral plasterboard products meet the requirements of AS 2588 Gypsum plasterboard PLASTERBOARD FEATURES AND BENEFITS e Lightweight e Cost effective e Versatile e Easy to install to timber steel and masonry substrates e Provides smooth sta
67. s are best run the full length of the wall to avoid butt joints INSTALLATION IN NON TILED AREAS Wet Area Board in non tiled areas may be fixed as per standard installation specifications refer to page 32 e Ensure sheets sit flat against framing e Neatly cut out penetrations and holes using hole saw gri WIND SEDISZ EIN DE IST a Fiberock in non tiled areas must be fixed using mechanical e Fix 40mm x 40mm corner support angles where fasteners only required leaving a 6mm gap at the bottom e Use screws as indicated in Tables 11 and 12 on page 20 e Screws should be slightly overdriven but should not break the face paper e Hold plasterboard sheets firm against framing while driving fasteners e Position screws 10 16mm from sheet edges Tiles greater than 12kg m up to 32kg m max Tiles up to 12kg m 100mm ctrs max at sheet ends 150mm ctrs max at sheet ends 100mm ctrs max at intermediate studs 200mm ctrs max at intermediate studs Tiles no greater than 12kg m Tiles greater than 12kg m up to 32kg m max Figure 59 Plasterboard Fixing in Tiled Areas PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 47 USGBORAL WET AREAS WATERPROOFING OF JOINTS AND JUNCTIONS WITHIN WET AREAS Joints and junctions within wet areas must be waterproofed prior to installation of tiling or other approved surface materials Cut edges of gypsum linings at wall floor junctions preformed shower bases and
68. s distribute the correct amount of joint compound over flat surfaces All flat boxes have an adjustable setting that automatically crowns the joint When second coating with 200mm box avoid too much take off if following through with a broad knife this will ensure that joint is flat 66 Figure 86 Banjo Box Application OCTOBER 2014 Figure 87 Flat Box Application PLASTERBOARD INSTALLATION MANUAL En USGBORAL g DECORATING PLASTERBOARD LININGS GENERAL REQUIREMENTS AVOIDING GLANCING LIGHT EFFECTS When finishing USG Boral plasterboard walls and ceilings consider the effects of glancing light Walls and ceilings that seem perfectly flat in diffused light may appear rough when e Wallpapering lit by light falling across the wall or ceiling surface USG Boral plasterboard linings are an excellent base for e Painting e Special finishes Avoid glancing light problems through careful planning When preparing and decorating plasterboard surfaces of lighting and paint application at the design stage ensure that only high quality paints wallpapers etc are used refer Glancing Light on page 12 and applied in accordance with the manufacturer s instructions For more information refer to the following publications If using semi gloss or gloss paint it is recommended that plasterboard surface is finished to a Level 5 standard as these paints tend to highlight surface variations e CSIRO lumination and D
69. s for plasterboard linings must comply with AS 1684 Timber Framed Construction Roof trusses must comply with AS 4440 nstallation of Nailolated Timber Roof Trusses For the purposes of determining a suitable plasterboard fixing method timber falls into the following categories LOW SHRINKAGE TIMBER e Timber with a moisture content under 16 at the time of lining Generally includes seasoned or kiln dried timbers such as F5 F7 Radiata Pine e Timber with moisture content at or above 16 but a tangential shrinkage below 8 Generally includes green timbers such as Radiata Pine Hoop Pine Douglas Fir Cypress Pine Western Hemlock Jarrah Red Narrow leaved lronbark Rose Flooded Gum and Spotted Gum Both mechanical fastener only or combination adhesive fastener fixing methods can be used for low shrinkage timbers HIGH SHRINKAGE TIMBER Timber with moisture content at or above 16 at the time of lining and a tangential shrinkage of more than 8 is classified as high shrinkage timber This generally includes timbers such as Mountain Ash Messmate River Red Gum Alpine Ash Karri and Blackbutt commonly referred to as Builder s or OB Hardwood When fixing plasterboard to high shrinkage timbers a combination adhesive fastener system must be used TREATED TIMBER USG Boral PremiumBond stud adhesive can be used with anti termite treated or untreated internal timber H2F treated timber should be aired for a minimum of 14
70. s max Figure 72 Arch construction Figure 73 Rondo External Corner PO1 Figure 74 Rondo External Corner P32 Figure 75 Rondo Arch Bead P10 PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 55 USGBORAL gf CORNICES The installation specifications provided below are applicable to USG Boral paper faced cornices HANDLING AND LAYOUT e Ensure cornices are stacked neatly away from traffic areas to protect profile and prevent damage e Cornice should be carried and handled on edge to avoid cracking the core or wrinkling the paper liner e Where possible use full lengths of cornice and mitre all corner and butt joints e Ensure accurate and level placement by marking ceiling and walls with a line at the cornice edge e Install shorter lengths of cornice first then fit longer lengths by bowing out to spring mitres into place CUTTING CORNICE e Measure mark and cut cornice with a mitre cut each end using a fine tooth saw and a mitre box e Cut internal angles from the long point and external angles from the short point e Check each cut piece of cornice for actual fit e Measure and precut cornice to length before mixing the cornice adhesive 56 Position A Position B Position C Position D Figure 76 Cutting cornices using a mitre box Figure 77 Finished Cornice Figure 78 Cornice mitre box OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL En USGBORAL gf CORNICES
71. s operations and to make a positive difference to the environment and communities in which it operates Plasterboard is manufactured from abundant natural gypsum resources and 100 recycled paper liner Plasterboard waste can be recycled back into new plasterboard or used as a soil conditioner Please contact USG Boral regarding waste collection services available in your region HEALTH AND SAFETY For information regarding the safe use of USG Boral products and accessories please refer to instructions on the product packaging or contact your local USG Boral Sales Office or TecASSIST for a current copy of the Material Safety Data Sheet TECHNICAL ENQUIRIES TecASSIST 1800 811 222 TecASSIST provides free technical advice to builders architects contractors engineers regulators and home owners throughout Australia TecASSIST can be contacted on weekdays 8 30am 4 30pm AEST on 1800 811 222 or www usgboral com tecassist SALES ENQUIRIES 1800 003 377 ACT 7 Barrier Street Fyshwick 2609 F 02 6280 5816 New South Wales 3 Thackeray Street Camellia 2142 F 02 9638 5557 Northern Territory 62 Benison Road Winnellie 0820 F 08 8947 1396 Queensland 22 Kirra Street Pinkenba 4008 F 07 5115 732 South Australia 59 Burleigh Avenue Woodville North 5012 F 08 7002 6381 Tasmania 95 Albert Road Moonah 7009 F 05 6278 9865 Victoria 251 Salmon Street Port Melbourne 5207 F 03 9214 2192 Western Australia Bassett Road Middle Swan 6056 F
72. sgboral com INTRODUCTION This manual is intended for use by plastering contractors and builders It outlines recommended methods for installation jointing and finishing of USG Boral plasterboard linings in non fire rated residential construction including general areas wet areas garage ceilings and shielded external ceilings Refer USG Boral System Selector and relevant system publications for fire rated and acoustic construction details While this manual outlines plasterboard installation specification for timber framed construction similar installation jointing and finishing details apply to steel framed buildings Refer relevant USG Boral publications for steel framed plasterboard construction details Installation specifications outlined in this manual apply to Level 4 finish unless noted otherwise see Levels of Finish USGBORAL gf STANDARDS The following Australian and other Standards are referenced in this publication e AS 2588 Gypsum plasterboard e AS 2589 Gypsum linings Application and finishing e AS 3 40 Waterproofing of domestic wet areas e AS 4858 Wet area membranes e AS 1684 Timber framed construction e AS 4440 Installation of nailplated timber roof trusses e AS 1170 2 Wind actions e AS 1597 Steel sheet and strip hot dipped zinc coated or aluminium zinc coated e AS 3 00 Masonry structures e AS2918 Domestic solid fuel burning appliances Installation e AS 5601 Gas installation
73. sible and above the anticipated level of any future ceilings e Ensuring that the ratio of the total net free ventilating area to ceiling area is not less than 1 150 Brick veneer wall Slab on ground construction Figure 3 House Ventilation PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 7 USGBORAL gf DESIGN CONSIDERATIONS DEVICES GENERATING HEAT USG Boral Plasterboard does not recommend the use of radiant heating systems continuously subjecting plasterboard ceilings to temperatures in excess of 42 C Prolonged exposure to temperatures higher than 42 C may cause changes in the chemical composition of the gypsum core and loss of plasterboard integrity over time The following regulatory and normative requirements must be followed in order to prevent plasterboard deterioration due to excessive temperatures from heat generating devices e BCA provisions for installation of heating appliances fireplaces chimneys and flues e AS 2918 Domestic solid fuel burning appliances Installation e AS 5601 Gas installations In accordance with AS 5601 gypsum based wall boards within 200mm of the edge of the nearest burner must be protected to a height of not less than 150mm above the periphery of that burner and for the full length of the cooking surface area with a fire resistant facing material In no case the periphery of the burner should be closer than 140mm to wall linings 6mm fibre cement bo
74. so each tier is evenly supported If billets are not soaced evenly To reduce the risk of damage plasterboard should be or in vertical alignment cumulative pressure on unsupported delivered to site just prior to installation lower units may cause plasterboard to sag During handling sheets should be carried in an upright position with particular care taken to protect the edges Plasterboard should be stored in neat flat stacks off the ground floor in a dry covered area This will prevent sagging and minimise damage to board edges and surfaces If storing outdoors stack sheets on a level moisture free platform and keep fully protected from the weather Ensure the platform can support a load up to 800kg m density Plasterboard stacking supports should be spaced at no more Figure 10 Correct placement of billets than 600mm centres 400mm centres for 6 5mm Flexiboard HOW TO POSITION A LOAD e Billet width and height should be uniform e Billet length should correspond to plasterboard width eg 1200mm long billets for 1200mm wide plasterboard 1350mm long billets for 1550mm wide plasterboard Figure 11 Incorrect placement of billets Figure 12 How to position a load PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 17 USGBORAL gf FRAMING FRAMING CHECK Prior to installation of plasterboard framing should be thoroughly checked by builder to ensure that e tis plumb level and square e Spacing of
75. sts shadows from minute undulations that would not normally be visible in diffuse non directional lighting While minor surface variations can always be expected even with a Level 5 finish the appearance of flatness will depend predominantly on the amount of glancing light the surface receives and to some degree its intensity and direction Some of the worst instances of glancing light occur with ceiling mounted unshaded light globes and where windows are located close to ceilings or walls allowing sunlight to shine across adjacent surfaces In order to avoid the effects of glancing light it is important to carefully plan selection and placement of windows and lighting during the design phase ARTIFICIAL LIGHT It is recommended that artificial lighting should either be hung below the ceiling surface and fitted with shades or recessed into the ceiling ie downlights Positioning of feature lighting such as spot and flood lights needs to be planned so that light shining across wall or ceiling surfaces is minimised Wall mounted lights shining up on the ceiling tend to accentuate wall surface variations High output lights are more severe in their effect because they create deeper shadows Similarly the whiter the light the stronger the contrast and the greater the perceived surface variations Soft low wattage diffused lighting provides the most favourable lighting conditions for wall and ceiling surfaces NATURAL LI
76. t hob or step down Enclosed Showers preformed showerbase WATERPROOFING OF WALLS Waterproof to 150mm min above the shower floor substrate or 25mm min above the max retained water level and the remainder to be water resistant to a height of 1800mm min from finished floor level Water resistant to a height of 1800mm min from finished floor level WATERPROOFING OF JUNCTIONS Waterproof wall to wall junctions to a height of 1800mm min above finished floor level 40mm min either side of junction Waterproof wall floor junctions within shower area Waterproof wall to wall junctions to a height of 1800mm min above finished floor level 40mm min either side of junction Waterproof wall floor junctions within shower area WATERPROOFING OF WALL PENETRATIONS Waterproof penetrations in shower area Waterproof penetrations in shower area Unenclosed Showers Waterproof to 150mm min above the shower floor substrate or 25mm min above the max retained water level and the remainder to be water resistant to a height of 1800mm min from finished floor level within 1500mm from shower connection to the wall Waterproof wall to wall junctions to a height of 1800mm min above finished floor level 40mm min either side of junction Waterproof wall floor junctions within 1500mm from shower connection to the wall Waterproof penetrations in shower area Areas adjacent to baths and spas Water resistant to
77. tes e Framing members should be clean and free from dust dirt grease and surface moisture Refer to General Screw and Nail Fixing on page 20 Stud adhesive daubs should be approx 25mm diameter x 15mm high Do not use adhesive at sheet ends Keep daubs 200mm nom from sheet edges Keep daubs 200mm nom from screw points It is recommended that at sheet ends screws are spaced at 300mm maximum centres for cornices and 150mm maximum centres for square set finish 200mm nom Figure 19 Adhesives and screw fasteners at sheet edges ADHESIVE AND FASTENER LAYOUT 1 3 Fixing Method Preferred Space fasteners at 1 3 points across the width of the sheet and daubs half way between fasteners Conventional Method Use double fasteners along the sheet centreline and space daubs between the fasteners at 230mm maximum centres Ceiling fastener and adhesive layouts for both methods are shown in the table below TABLE 20 ADHESIVE AND FASTENER LAYOUT FOR CEILINGS SHEET WIDTH CONVENTIONAL FIXING 1 3 FIXING 900mm FAF FAF FAFAF 1200mm FAAF FAAF FAFAFAF 1350mm FAAF FAAF FAFAFAF Legend F screw F F double screws A adhesive FIXING WITH SCREWS ONLY e Space screws at maximum 300mm centres across the width of the sheet e At sheet ends space screws at 500mm maximum for cornices and 150mm maximum for square set finish e Refer to General Screw and Nail Fixing on page 20 e Refer Table 21 and Figure 22
78. tion P35 Control Joint e Leave gap of 20mm nominal between the ends of plasterboard sheets e Insert the surface mounted P35 Control Joint in the gap and fix by stapling or nailing on to the board at 300mm centres e Stop and finish the joint e When dry remove the filament tape protecting the centre of the P35 to leave a clean neat joint Complete break in wall framing 20mm nom gap Figure 36 Control joint in timber stud wall Figure 37 Rondo Control Joint Section P35 PLASTERBOARD INSTALLATION MANUAL OCTOBER 2014 35 FRAMED WALLS DOOR JAMBS Jamb stud Plasterboard lining Packing Door jamb Door jamb Plasterboard lining Architrave Rondo P50 Shadowline Stopping Angle Figure 38 Door Jamb With Architraves Figure 39 Door Jamb With Shadowline Stopping Angle SHADOWLINE STOPPING ANGLE The Rondo P50 Shadowline Stopping Angle can be used to neatly finish plasterboard where e aset joint or internal corner is not possible e cracking may occur e a shadowline effect is required such as plasterboard and masonry wall junctions ceiling and wall junctions door and window jambs Figure 40 Rondo Shadowline Stopping Angle P50 36 OCTOBER 2014 PLASTERBOARD INSTALLATION MANUAL FRAMED WALLS WALL CEILING JUNCTIONS Common treatments of timber framed plasterboard wall ceiling junctions include the following Ceiling lining Cornice fixed as per the USG Boral
79. und and a minimum of two separate coats of joint compound applied over all joints angles fastener heads and accessories Butt joints in walls and ceilings must be between framing members and in certain cases back blocked Recessed joints in the ceilings must be back blocked in any area containing three or more recessed joints If Level 4 surface is to be exposed to critical light see Glancing Light on page 12 it should be covered with textured finishes or wall coverings Smooth textured finishes and flat matt or low sheen paints can be used when Level 4 finish is illuminated by non critical lighting Flat paints in this situation tend to conceal joints better Weight texture and sheen level of wall coverings and finishes should be carefully evaluated and joints should be adequately concealed if wall covering material is lightweight glossy or lightly patterned LEVEL 5 Level 5 finish should be used where gloss or semi gloss paints are specified or where lining surfaces will be exposed to critical lighting conditions Level 5 finish is characterised by a parity of surface texture and porosity All joints and interior angles must have tape embedded in the jointing compound and a minimum of two separate coats of jointing compound applied over all joints angles fastener heads and accessories Butt joints in walls and ceilings must be between framing members and back blocked Recessed joints in the ceilings must be back block

PLASTERBOARD INSTALLATION MANUAL

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