Water Resistant Plasterboard

Transcription

1 Water Resistant OCTOBER 2012 water resistant plasterboard Water Resistant Wet area application Australian Owned & Manufactured

2 BGC HISTORY & MISSION BGC Fibre Cement and is a proudly Australian based company that produces fibre cement and plasterboard products for Australia and for eport. BGC is one of Australia s largest builders of houses and commercial buildings in addition to being a manufacturer of building products other than plasterboard and fibre cement such as insulation, windows, bricks, roof tiles, steel fabrication, insulated wall panels, plumbing materials and metal roofing. We also have a construction material division producing concrete, cement and asphalt in addition to owning several quarries. The recently released Innova range of fibre cement flooring and façade systems has proven to be a huge success. We have used innovation to ensure these products and systems are lighter and easier to install than our competitors, another eample of BGC s commitment to market leadership. At BGC we have a team of technical eperts who can assist with specifications and design solutions for even the most challenging of projects. BGC s Fibre Cement and division prides itself on being innovative and environmentally focused. Both factories are located in Perth and there are BGC distribution centres across Australia and New Zealand. BGC has shown leadership in the Australian market by being one of the first manufacturers to obtain GECA certification on the majority of their plasterboard products. We are very proud of the fact that our board meets GECA s requirements by using up to 15% recycled gypsum and 100% recycled paper for the front and back of our plasterboard. We are an active participant in environmental reporting through Energy Efficiency, Waterwise and Emissions reporting programs to keep our environment safe. Our mission at BGC is simple " Build it Better with BGC".

3 Water Resistant wet area applications BGC designed and developed WR for wet area walls, in residential and commercial buildings, such as bathrooms, laundries, toilets and cleaning room areas, and eterior ceilings such as alfresco areas. BGC WR has a low absorption core, eliminates the probability of water wicking, therefore preventing possible damage to the supporting structure and wall finishes. Water Resistant : Specifically designed for wet areas Has a low absorption core Light blue face for ease of identification Quick and simple to install Can be used for eterior ceilings 03

4 Contents Introduction 4 Key Benefits 4 Level of Finish 4 Early Fire Hazard Indices 4 Availability 4 Handling & Storage 4 Installation 5 Tiled Areas 5 Pre-Formed Shower Base 5 Insitu Shower Tray 5 Shower Over Bath 6 Structural Movements and Control Joints 7 Jointing 8 Australian Standards - Wet Areas 10 Finish Selection The selection of plasterboard finish in wet areas depends on the desired tiled surfaces and other wall decorations required. Generally, use Level 4 finishes in wet areas, as detailed in AS Where tiles are used, the finish can be of a lower standard and where other decoration is required, the standard is higher. BGC recommends the architect s specifications for the level of finish required. Early Fire Hazard Indices BGC WR complies with AS Introduction BGC Water Resistant (WR) complies with the requirements of AS2588 Gypsum, (refer CSIRO Test Report DTS 713). BGC designed and developed WR for wet area walls, in residential and commercial buildings, such as bathrooms, laundries, toilets and cleaning room areas. BGC WR is to be installed in accordance with AS Gypsum Plaster Linings in Residential and Light Commercial Construction - Application and Finishes and as detailed in AS 3740 Waterproofing of Wet Areas within Residential Buildings. BGC WR has a light-blue fungal resistant multi-layered facing board for easy identification. It is available in 10mm and 13mm thicknesses with recessed edges, ready for taping and jointing with proprietary water resistant stopping and setting compounds. BGC WR has a low absorption core, eliminates the probability of water wicking, therefore preventing possible damage to the supporting structure and wall finishes. Ignitability Inde - 0 Spread of Flame Inde - 0 Heat Evolved Inde - 0 Smoke Developed Inde - 4 Availability BGC WR is available in 10mm and 13mm thicknesses, 1200mm and 1350mm wide and in various lengths. BGC ensures that the range of stock sheet sizes listed are available, however variations may occur in some states. Sheet Sizes THICKNESS (mm) 10 WIDTH (mm) SHEET WIDTH (mm) Key Benefits Cost effective, drywall wet-area lining system. High serviceability performance board. Dimensionally stable substrate for tiled wall finishes. Ready for decorative paint and thin cover finishes. Handling & Storage Water Resistant should be stacked flat, up off the ground and supported on level, equally spaced (ma 450mm) gluts. Care should be taken to ensure edges of the Water Resistant are not damaged when handling. Water Resistant should be delivered to site immediately prior to installation to reduce the risk of damage. 04

5 Installation Install and fi BGC WR sheets horizontally to minimise the number of joints and to minimise light reflections across the joints. Table 2-Minimum Screw Fastener Length and Type SHEET THICKNESS (mm) CFS STEEL UP TO 0.55 BMT CFS STEEL 0.75 TO 1.1 BMT Cut the BGC WR from the face and snap back away from the score, then cut the back paper face toward the front face NP NP SDP SDP Use a straightedge for neat straight cuts. Framing Install and fi BGC WR to timber or Cold Formed Steel (CFS) framing or furring channels, which satisfy the BCA requirements and which have been plumbed true and straight. NOTE: Timber shall be kiln dried with a moisture content below 16%. Prior to installing and fiing BGC WR, ensure that the preceding trades have certified, that - NOTE: When fiing into preservative treated timbers, Class 3 AS coatings of screws and nails are to be used. NOTE: Do not fi BGC WR with adhesives in tiled areas. Figure 1 - Sheet Set Out Untiled Areas Timber or steel wall frame (typical) Structural movement will not occur (or is minimised) at wall-to-wall and floor-to-wall junctions. All noggings, trims and the like, are correctly installed and fied for the bath, basins and other fitures (Noggings are spaced at 600mm maimum centres for 10mm plasterboard and 800mm maimum centres for 13mm plasterboard). 150 Typical 300 Typical 150 Typical All perimeters, corner and control joint flashings are in place and correctly installed. Fiing BGC WR Set sheet 10 mm Clear of floor Note: Do Not use adhesive in tiled areas Secure sheet edges at each stud Fi BGC WR sheets horizontally to wall framing and or metal framing, with the bottom sheets first, at 6-10mm clear of the finished floor. Set out sheets around all wall openings, with cutouts 200mm horizontally and 250mm vertically, to prevent corner cracking. For untiled walls space fasteners at 150mm maimum centres on internal and eternal corners. See Figure 1. Press sheets firmly against the frame and fasten along one recessed edge at each framing member. For all wet areas fasten sheets with corrosion resistant Class 3, or better screws, which comply with AS 3566: For timber-framing plasterboard nails must comply with AS 2334 Steel Nails - Metric series and have a minimum Class 3 or better corrosion resistance. BGC recommends the use of screw fasteners instead of nails. 05

6 Tiled Walls Position fasteners between 10mm and 16mm from the edge of the sheets at the correct spacing to carry the loads of the tiles. For walls with tiles 6.5mm thick or 12.5 kg/m2 or less, space fasteners at 200mm maimum centres on the intermediate studs and at 150mm on internal and eternal corners, butt joints and around openings. Where tiles are greater than 6.5mm thick or 32 kg/m 2, space all fasteners at 100mm maimum centres in the centre of sheets, on internal and eternal corners, butt joints and around openings. BGC recommend water proof membrane be used in wet areas 150mm around bath and 150mm above vanity as shown in figures 13, 14 and 15. Tile adhesive should be compatible with the waterproofing membrane. Pre-Formed Shower Base and Eternal Shower Tray Pre-Formed Shower Base and Eternal Shower Tray - cont. Install and fi sheets to the wall framing 6mm clear of the shower tray up-stand; See Figure 2 and of the mortar bed in the eternal shower tray. Caulk the bottom edge of the sheets and the shower base orthe mortar bed and around plumbing fitures with a fleible sealant. See Figures 2 & 3. Penetrations The WR must be cut out to leave a 6 mm gap all round the fiture. This gap must be filled with a mould resistant fleible sealant. BGC recommends using a hole saw to make a neat cut out for fittings such as taps, shower roses etc. Do not use a hammer. Additional framing must be installed as required to properly support all fitures. Preliminary work and detail fiing out is similar for eternal shower trays and preformed shower bases, as shown in Figure 2. Figure 3 - Sealing Penetrations Install and fi perimeter-flashing angles, at the wall/ floor junction and preformed shower bases or eternal shower trays, prior to fiing WR plasterboard lining. Cut and install PVC corner angle, down inside the pre-formed shower base; Figure 8 and fasten to framing at 600mm centres, in a staggered pattern. Seal the lower edge of WR sheets, whether cut or not, with a proprietary wet-area acrylic sealant or silicone to prevent potential moisture wicking. To form neat holes for penatrations in WR - a hole saw is recommneded 6 mm gap all round Silcone Sealant Timber Framing Figure 2 Ceramic Tiles BGC WR Install noggings as necessary to Support fittings Nogging set 25 mm above shower base for fiing lower edge of the BGC WR Timber Framing BGC WR Ceramic Wall Tiles Notch framing to accommadate shower base Fleible sealant 6mm Preformed Shower Base 06

7 Insitu Shower Tray Shower Over Bath Install and fi perimeter-flashing angles, at the wall/floor junction. Cut and install PVC corner angle and fasten to framing at 600mm centres, in a staggered pattern. Seal the lower edge of water resistant plasterboard sheets, whether cut or not, with a proprietary wet-area acrylic sealant to prevent potential moisture wicking. Install and fi sheets to the wall framing, as outlined previously, 6mm clear off the floor. Form a bond-breaker with closed-cell foam backing rod and masking tape at the bottom edge of the at wall/floor junction, as shown in Figure 4. Caulk around plumbing penetrations. Apply a proprietary liquid membrane material to the face of the plasterboard and floor to form an insitu internal shower tray. Follow the membrane manufacturers instructions. Preliminary work and fiing out detail is similar for preformed shower bases and in part the insitu tray details, see Figure 13. Cut and install PVC corner angle, down inside the bath up-stand flange and fasten to framing at 600mm centres, in a staggerd pattern, see Figure 5. Seal the lower edge of water resistant plasterboard sheets, whether cut or not, with a proprietary wet-area acrylic sealant, to prevent potential moisture wicking. Install and fi sheets to the wall framing, as outlined previously 6mm clear off the bath up-stand. Caulk the bottom edge of the sheets and the bath edge around plumbing fitures with a mould resistant fleible sealant. Apply a proprietary branded liquid membrane 150mm above the bath edge and wall surround, to a minimum height of 1800mm to the entire area above the finished floor level and 75mm each side of the corner, see Figure 5 & 13. Apply the membrane to the entire shower area to a minimum height of 1800mm from the finished floor surface. The liquid membrane is to etend 75mm minimum each side of the corner. Note: Use only insitu membrane materials appraised and approved by recognised authorities. Figure 5 Corner blocking Corner flashing required to Bath base Figure 4 Liquid membrane Wall framing Paper tape using BGC Taping Cement or Eterior and Wet Area Base Coat Corner flashing Wall tiling to Builders specification BGC WR View A BGC WR Flashing Additional Tiling framing required Bath Wall tiling to Builders specification Liquid membrane Perimetre flashing Fleible sealant Fleible sealant required Notch framing to accomodate Bath rim Additional framing required Fleible sealant required Bond breaker Masking tape Mortar bed BGC Compressed fibre fement sheeting 07

8 Structural Movements and Control Joints Buildings and their component parts move over time due to various factors which may lead to building and or system failures if design, materials and/or installation are not satisfactory. To minimise the risk of system failure take care when designing, detailing, installing and finishing all aspects of wet areas. The design of wet areas must take into account any relative movements in the building structure and components, due to loading and temperature and humidity variations and the like. See Figure 6. Control Joints In long runs of wall, control joints should be set at 7.2 metres maimum in non-tiled areas, and at 4.2 metres maimum, in tiled areas or at construction joints, which ever is the lesser. Control joints must allow for the differential epansion and contraction between the structure, wall lining and tiles. Control joints, must be constructed with double studs, with a gap to suit the control joint type. Refer Figure 7. Figure 7 Figure 6 Frame As constructed Frame After shrinkage Additional studwork Rondo P35 Control joint or MBS P45 Jointing Kit installed to manufacturer's recommendation Wall Framing - Light weight steel or Timber (Typical) BGC WR Insitu internal shower tray membrane BGC WR Masking tape: Holds bond breaker in position and prevents liquid membrane penetrating behind bond breaker Bond breaker (backing rod) Gap Mortar bed base dropped Gap opens between Mortar bed and Shower tray, at the wall, as framing shrinks Flush finish with bedding cement - Keep joint clean of flushing material 15mm Gap Mortar bed Corner Jointing BGC Compressed sheet flooring Base dropped Gap Gap due to shrinkage Corners are set and finished with paper tapes in wet areas for internal corners, or eternal beads for eternal corners. However, in wet area construction, corners above pre-formed shower bases, insitu trays and shower over baths situations require special attention to detail, as noted. View A View B Gap 08

9 Vertical Corner Flashing Jointing In tiled walls, vertical corner flashings finish inside pre-fabricated shower tray/base, insitu-laid trays or the like. Refer Figure 8. Figure 6 Wet area plasterboard joints must satisfy the BCA requirements and comply with AS All WR joints in wet areas must be set with perforated paper tapes and proprietary branded base and flushing compounds such as BGC WR Taping Cement, BGC Eterior and Wet Area Base Coat and Top Coat outside tiled areas. Mould resistant fleible sealant BGC WR Prefabricated Shower tray Perimeter angle flashing a Rondo P40 Vertical corner angle flashing (4040 nominal) or pvc 5050 Skirting - for details see figure 2 Eternal prefabricated shower tray The wet area base-coat system is typically a two-coat system under tiled areas and a three-coat system where tiles are not used. Refer Tables 3, 4 and 5. All horizontal, vertical and corner joints and fastener points must, be stopped and set with the same materials, to ensure water resistance across the wall areas. The use of correct materials, application and sequencing of taping and jointing is important and any deviation may result in joint failure. Miing of different proprietary compounds or application of setting type compounds over acrylic drying compounds, may lead to joint failure and will negate any proprietary item warranties. Floor tiling to Builders specification a Hob is formed inside shower tray Only use drying type topping or finishing compounds over BGC Eterior and Wet Area Base Coat. NOTE: Do not use setting type compounds over water-resistant acrylic drying type compounds. Mortar bed Prefabricated Shower tray Shower screen Tiled hob 25mm min Do not use self adhesive tapes. Paper Tape only to be used. Table 3 - Tiled Areas Concrete slab Section a - a NOTE: BCG Wet Area Taping Cement to be used under tiled areas only. Floor tiling to Builders specification FIRST COAT BGC Water Resistant Taping Cement or BGC Eterior and Wet Area Base Coat TAPE Perforated Paper Tape SECOND COAT BGC Water Resistant Taping Cement or BGC Eterior and Wet Area Base Coat FINISH COAT None Required BGC Eterior and Wet Area Base Coat may be used in tiled and untiled areas. Table 4 - Tiled Areas-Non-Wet Areas BGC Eterior and Wet Area Top Coat to be used in untiled areas only. FIRST COAT TAPE SECOND COAT FINISH COAT BGC Water Resistant Taping Cement or BGC Eterior and Wet Area Base Coat Perforated Paper Tape BGC Water Resistant Taping Cement or BGC Eterior and Wet Area Base Coat None Required Table 5 - Non-Tiled Areas-Finish Coat FIRST COAT TAPE SECOND COAT FINISH COAT BGC Water Resistant Taping Cement or BGC Eterior and Wet Area Base Coat Perforated Paper Tape BGC Water BGC Eterior Resistant Taping and Wet Area Top Cement or BGC Coat or BGC Eterior and Wet Multipurpose Area Base Coat Joint Compound or BGC Top Coat 09

10 First Coat and Tape Finish Coat Wipe joint recesses with damp cloth to remove dust from plasterboard face. Fully fill recess evenly with BGC WR Taping Cement. Centrally bed the paper tape into bed coat and cover lightly with BGC WR Taping Cement or BGC Eterior and Wet Area Base Coat and allow to fully dry. Cover all fastener points with BGC WR Taping Cement or BGC Eterior and Wet Area Base Coat and allow to fully dry. The finish coat is only required where tiles are not used and another decorative finish is required. Eg level 4 Finish. Apply a 250mm wide approimate, thin finish coat, centrally over the second coat. Dampen the outer edges with a sponge to feather out the edges of the finish coat and allow to dry. Apply a thin finish coat over all fastener points and feather out 40mm and allow to dry Figure 9 First coat 100mm appro 1.Fill recess 2. Install paper tape over joint centre line Figure Apply Topping Coat 250mm 3. Lightly cover paper tape First Coat Topping Coat Second Coat Sanding and Finishing Apply the second coat of BGC WR Taping Cement or BGC Eterior and Wet Area Base Coat 180mm wide and feather out the edges and allow to fully dry. Apply a second coat to all fastener points, feather out 25mm and allow to fully dry. Allow joint and fastener point coating compounds to dry for 24 hrs before sanding. For tiled areas lightly sand all joints and fastener points, with 150 grit or with 220 sanding mesh, to remove any high spots. Wipe off ecess dust with a slightly damp cloth, prior to the application of tile adhesive, seal coats or decorative finishes. Figure Second coat 180mm appro Figure Allow 24 hours min drying time then lightly sand joint Second Coat Finishing Sanding The above is applicable for both tiled and non-tiled areas (Level 4 Finish). First coat and second coat only required for tiles areas 10

11 Australian Standards The following tables are the specific requirements for Wet Areas taken from the Australian Standards and are applicable to areas lined with BGC WR. Wet Areas Figure 13 Water Proofing 1800mm above base of bath 1500mm Min. Radius from Shower Rose BGC WR An area within a building supplied with water from a water supply system and includes bathrooms, showers, laundries and sanitary compartments. Ecludes kitchens, bar areas, kitchenettes or domestic food and beverage preparation areas. The BCA requires that all wet-area design, construction and materials, do not create unhealthy, dangerous conditions, or damage to building components, caused by dampness, water overflow, infiltration or penetration. Fleible sealant along Bath / Sheet joint Additional treatment required to area shown darker, if shower screen not fitted Seal tap set penetrations using mould resistant fleible sealant Water proofing 150mm wide along vertical corners of bath LEGEND: - Not Applicable / * Including mechanical fiings or fasteners through surface materials / Wall/floor junctions only / Where floor waste is provided the floor shall be graded to the waste / If a shower is included in a bath, include the requirements for shower area walls Waterproof entire floor if Compressed Fibre cement sheet flooring Water proofing 150mm wide along Bath / Floor joint Table 6 - Design and Installation for Wet Area Waterproofing AS Vessels or area where the fiture is installed Level of risk Floor Design and installation criteria Walls Junctions Penetrations Figure No. Shower area High Waterproofed & drained Water proof Waterproof Waterproof* 14 Bathrooms Medium Concrete & compressed fibre cement sheet flooring Water resistant Waterproof 13, 15 Areas adjacent to baths & spas (applies to all rooms in which a bath or spa is installed) Medium Timber floors including particleboard, plywood & other materials Waterproof Waterproof 13, 15 Concrete & compressed fibre cement sheet flooring Water resistant Water resistant Waterproof Horizontal surface Waterproof* Vertical surface Water resistant Timber floors including particleboard, plywood & other materials Waterproof Water resistant Waterproof Horizontal surface Waterproof* Vertical surface Water resistant 15 Walls adjoining other vessels (e.g., sink, basin or laundry tubs) Low Water resistant Waterproof Horizontal surface Waterproof* Vertical surface Water resistant Laundries & WCs Low Water resistant Water resistant Bathrooms & laundries requiring a floor waste in accordance with Volume One of the BCA High Waterproofed and drained Waterproof Waterproof where through the floor, otherwise 11

12 Australian Standards Figure 14 Internal Corner Flashing to 1800mm above finished floor level Wall tiling (typical) waterproofed entire shower area Shower screen fitted BGC WR 1800 mm Above Hob Seal tap set penetrations using mould resistant fleible sealant Floor sloped toward drain Preformed shower base Table 7 - General Requirements for Etent of Application AS Vessels or area where the fiture is installed Floors & horizontal surfaces Walls Design and installation criteria Wall junctions & joints Penetrations Figure No. Shower area Enclosed & hobbed Waterproof entire enclosed shower area, including hob Waterproof to 150mm min. above the shower floor substrate or 25mm min. above the maimum retained water level and the remainder to be water resistant to a height of 1800mm min. from finished floor level Waterproof internal & eternal corners & horizontal joints within a minimum height of 1800mm above the floor level with a minimum width of 40mm either side of junction Seal all penetrations 14 Enclosed & hobless Waterproof entire enclosed shower area including water stop Waterproof to 150mm min. above the shower floor substrate and the remainder to be water resistant to a height of 1800mm min. from finished floor level Enclosed & stepped down Waterproof entire enclosed shower area including the stepdown Waterproof to 150mm min. above the shower floor substrate or 25mm min. above the maimum retained water level and the remainder to be water resistant to a height of 1800mm min. from finished floor level Enclosed & preformed shower base Water resistant to a height of 1800mm min. from finished floor level Seal all penetrations 14 12

13 Table 7 - Continued Vessels or area where the fiture is installed Floors & horizontal surfaces Walls Design and installation criteria Wall junctions & joints Penetrations Figure No. Insert baths for floor under the bath Waterproof entire shelf area, incorporating a waterstop under the bath lip and project a minimum of 5mm above the tile surface for wall under the bath Waterproof to 150mm above the lip of the bath* for wall under the bath* Seal all tap & spout penetrations where they occur in a horizontal surface 13 Walls adjoining other vessels (e.g., sink, basin or laundry tub) Water resistant to a height of 150mm min. above vessel if the vessel is within 75mm min. of the wall Where the vesel is fied to a wall, seal edges for etent of vessel Seal all tap and spout penetrations where they occur in a horizontal surface Laundries & WCs Water resistant to entire floor Seal all wall to floor junctions with a skirting or flashing to 25mm min. above the finished floor level, sealed to the floor Waterproof all wall to floor junctions, where a flashing is used the horizontal leg shall be a minimum of 40mm Bathrooms & laundries requiring a floor waste in accordance with Volume One of the BCA Waterproof & drain entire floor Seal all wall to floor junctions with a skirting or flashing to 25mm min. above the finished floor level, sealed to the floor Waterproof where through the floor, otherwise LEGEND: - Not Applicable / * If a shower is included in a bath, refer to the requirements for shower area walls & penetrations Does not apply to joinery fittings such as vanities Figure 15 Seal penetrations using mould resistant fleible sealant BGC WR Wall Tiling to Builders specification. If bath surround is installed, a perimeter flashing angle is required at this junction (both floors and walls) BGC WR 150mm 150mm Perimeter Flashing between wall & floor Surround, Wall and Floor tiling to Builders specification 13

14 Table 7 - Continued Vessels or area where the fiture is installed Floors & horizontal surfaces Walls Design and installation criteria Wall junctions & joints Penetrations Figure No. Unenclosed Waterproof entire shower area Waterproof to 150mm min. above the shower floor substrate or 25mm min. above the maimum retained water level and the remainder to be water resistant to a height of 1800mm min. from finished floor level Waterproof internal and eternal corners and horizontal joints to a minimum height of 1800mm above the floor level with a minimum width of 40mm either side of junction Seal all penetrations 13 Areas outside the shower area for concrete and compressed fibre cement sheet flooring Water resistant to entire floor Waterproof all wall to floor junctions, where a flashing is used the horizontal leg shall be a minimum of of 40mm 13 Areas outside the shower area for timber floors including particleboard, plywood and other flooring materials Waterproof entire floor Waterproof all wall to floor junctions, where a flashing is used the horizontal leg shall be a minimum of 40mm Areas adjacent to baths and spa* for concrete and compressed fibre cement sheet flooring Areas adjacent to baths and spas* for timber floors including particleboard, plywood and other flooring materials Water resistant to entire floor Waterproof entire floor Water resistant to a height of 150mm min. above vessel and eposed surfaces below vessel lip to floor level* Water resistant to a height of 150mm min. above vessel and eposed surfaces below vessel lip to floor level* Seal edges for etent of vessel and junction of bath enclosure with floor. Where the lip of the bath is supported by a horizontal surface this area shall be waterproof for showers over bath and water resist for all other cases Seal edges for etent of vessel and junction of bath enclosure with floor. Where the lip of the bath is supported by a horizontal surface this area shall be waterproof for showers over bath and water resist for all other cases Seal all tap and spout penetrations where they occur in a horizontal surface Seal all tap and spout penetrations where they occur in a horizontal surface BGC wishes to acknowledge and recommend treatment and installation of wet areas as per the Australian Standards 14

15 Eterior Alfresco Ceilings The construction of eterior entertainment areas attached to a dwelling with a lined ceiling in Australia is proving popular. These areas are inherently eposed to much more arduous conditions to that of the rest of the house internally. Areas that could be included are areas outside the main enclosed living area of a house or similar environment. E.g. carports, garage ceilings, alfresco areas or similar. Environment The environments of eterior ceilings are often severe and can be effected by;- The generally constant high humidity The climate of the region Wind loads Garage Roller Door Vibration Insufficient perimeter support To overcome potential problems in these areas it is important to consider the following points;- The correct choice and installation of lining materials, fasteners, jointing and coating materials, designed to suit the environments Correct placement and installation of battens and installation methods The design and detail of the structural components and their protection from moisture Final paint decoration Condensation Surface condensation and wind loads can be the main causes of lining board and jointing system failure. Insufficient protection can lead to the plasterboard distorting as well as potential mould attack. Use sarking or foil backed insulation underneath metal roofing as this is more susceptible to condensation build up than roofing tiles. It is important that ceiling cavity areas are well ventilated to prevent condensation build up, the Installation of eave and gable vents, roof ventilators etc can assist in this. Building materials and systems may be adversely affected by these severe environmental and physical conditions, which if not installed correctly can lead to ceiling failure and or collapse. Recommended BGC Materials 10mm Water Resistant 13mm Water Resistant 13mm Wet Area Fireboard 16mm Wet Area Fireboard Fasteners Fasteners used can be screws or nails and must be to Class 3. When fiing BGC to an eterior ceiling, use fasteners in the 1/3 spacing method using appropriate fasteners adhesive. Framing to be maimum 450 mm centres. Recommended fiing & spacing Screw fiings: width # of Screws Position of screws. 1200mm 5 evenly spaced 1 per recess & equally spaced 300mm centres. 1350mm 7 evenly spaced 1 per recess & equally spaced 225mm centres. Nail fiings: width # of nails Position of nails. 1200mm 7 evenly spaced 1 per recess & equally spaced 200mm centres. 1350mm 9 evenly spaced 1 per recess & equally spaced 170mm centres. Installation All perimeters to have appropriate framing/noggings etc in order to support all sheet edges. Perimeters to be screw fied only at 300mm centres. The perimeter may be fied out with timber noggings or metal plasterers angle (Rondo P18) or equivalent. Framing centres to be at a maimum of 450mm. All flush joints must be back blocked in accordance with AS/NZS2589:2007 Paper tape must be used in conjunction with drying type base products in the recessed joins. Eterior Base and topping to comply with ASTM C475. sheets to have a minimum 6mm space from perimeter walls. Fascia boards/perimeter beams should continue at least 20mm below the bottom of the plasterboard ceiling or the perimeter wall/ceiling trim. Painting Roll or brush on high quality sealer undercoat designed for eternal application. Use only manufacturer s recommended eternal paint for this application Level 4 shall be the minimum level finish for plasterboard. Level 5 is recommended when critical lighting conditions apply. 15

16 Considerations Warranty Before lining the building it is prudent to consider the following design and construction issues;- Consideration must be given to the framing, this may vary throughout Australia especially in high wind and coastal areas It is highly recommended to batten out the ceiling with Rondo 16mm metal battens or 16mm Furring Channel or 28mm Furring Channel or equivalent. These are to be fied on the appropriate direct fi clips. High-pressure differentials across a wall, may cause the wall to bend and move; hence Ensure that wall and ceiling areas do not eceed maimum allowable areas, heights or lengths, and provide movement and or relief control joints where necessary We warrant that our products are free from defects caused by faulty manufacture or materials for a period of 15 years from the date of purchase. If you acquire any defective products, we will repair or replace them, supply equivalent replacement products or refund the purchase price within 30 days of receiving a valid claim subject to product inspection and confirmation of the eistence of a defect by BGC. We will bear the cost of any such repair, replacement or refund. This warranty is given by: BGC Pty Ltd Ground Floor, 290 Bushmead Rd, Hazelmere, WA 6055 Phone: (08) Fa: (08) To claim under this warranty, you must provide proof of purchase as a consumer and make a written claim (including any costs of claiming) to us at the address specified above within 30 days after the defect was reasonably apparent, or if the defect was reasonably apparent prior to installation, the claim must be made prior to installation. You may not claim under this warranty for loss or damage caused by: faulty or incorrect installation by non-bgc installers (BGC s installation procedures are at failure to comply with the Building Code of Australia or any applicable legislation, regulations approvals and standards; products not made or supplied by BGC; abnormal use of the product; or normal wear and tear. The benefits available under this warranty are in addition to other rights and remedies of the consumer under the law. Our goods come with guarantees that cannot be ecluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and for compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure. 16

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20 To contact your nearest BGC stockist, please call: Adelaide Telephone Brisbane Telephone Melbourne Telephone Perth Telephone Sydney Telephone New Zealand Telephone Technical Help Line bgc.com.au/plasterboard BGC is a proud Australian owned manufacturer of products. BGC has state-of-the-art manufacturing facilities in Perth and distribution centres in all states of Australia and in New Zealand. Our distribution network ensures that our entire product range is readily available in all states of Australia. BGC has a team of technical specialists who can assist with all specification and design information. BGC provides builders, developers and architects with a range of design alternatives and innovative products, such as: BGC-2011 GECA v2- PANEL BOARDS Ceilingboard TM designed for interior use providing a flat, blemish free, monolithic, smooth surface ready for decorating and is ideal for all interior ceiling applications, residential and commercial where cost effectiveness is paramount. Enviroboard more recycled content than standard plaster board, BGC Enviroboard does not compromise on perforance, giving an interior lining board that meets performance requirements and is more friendly to the environment. WR primarily developed for wet area walls in residential and commercial buildings but is also ideal for Verandas, garages and alfresco ceilings. Fireboard TM designed for use where fire systems are specified in residential and commercial buildings. Fireboard TM delivers the required Fire Resistance Level whilst maintaining a flat, blemish free surface suitable for decoration. Soundboard TM is high density plasterboard that has been specifically designed to greatly reduce unwanted noises that can be heard from one room to another through walls and ceilings. Wet Area Fireboard TM has been developed specifically for use in wet areas where a fire resistance level is specified. Moisture Resistant Flameboard TM has been developed specifically designed for use in fire risk areas where no FRL is required. Compounds BGC plasterboard has developed a range of plasterboard compounds to aid in the fiing of our various products. Cove Cornice provides a clean, continuous line at the junction of wall and ceilings. Three profile sizes are available to suit all applications. Safe working practices - Please wear a P1 or P2 mask and safety goggles (approved to AS/NZW1337 standards) whilst cutting or installing Water Resistant. Water Resistant can be safely handled during unloading or stacking without the use of these precautions. Cleaning up - Always wet down your work area when cutting Water Resistant, to ensure that dust is managed. Dispose of any vacuumed dust with care and using containment procedures. Design by The SHAPE Group