Tempo:
If gypsum board is not to be directly attached to the structural members but instead to channels (for example, resilient metal channels) for sound control and/or fire resistance, the channel must be secured to the structure and the gypsum board affixed to the channel.
Finishing Joints The taping and finishing of gypsum board should be done at 10°C (50°F) or higher. Before the joints are taped, remove all loose paper and clean the joints. Fill all joints wider than 3 mm (1⁄8 in.) with joint compound and let it dry. Protect external corners with metal corner beads, and tape inside corners using paper tape folded as shown in Figure 165. Joint compound is supplied premixed or in powder form that is mixed with water to a soft putty consistency. Apply the first layer of joint compound in a band 125 mm (5 in.) wide along the joint. Apply the tape and press it into the wet compound with a trowel or wide-blade putty knife. Remove excess compound, smooth the tape and feather the compound band to zero thickness at its outer edges. After the first layer has dried, apply a second layer in a band 200 mm (8 in.) wide on recessed joints and 250 mm (10 in.) wide where the edges of the board are not recessed. Feather the edges. Apply a third layer and feather to a band 250 to 300 mm (10 to 12 in.) wide on recessed joints and 400 mm (16 in.) on joints that are not recessed. Make this layer as smooth as possible to reduce sanding. When the third layer has set, sand the feathered edges lightly with fine sand paper and avoid damaging the paper surface of the gypsum board. Nail and screw heads and indentations in the centre of the board are filled with two layers of joint compound.
Nail and Screw Popping Popping can occur with both drywall nails and screws. It results from wood shrinkage and will likely occur, if at all, during the first heating season as the moisture content in the wood acclimatizes to the average humidity level in the house. Popping can be minimized by using framing lumber with a moisture content of not more than 19 per cent as stipulated in the NBC and nails or screws that are just long enough to meet code requirements so that a minimum length of fastener is embedded in the area where shrinkage takes place.
WALL TILE FINISHES Ceramic, porcelain, glass, marble and granite tiles are used for wall finishes in bathrooms and kitchen areas. Ceramic, porcelain, marble and granite tiles can be applied with an adhesive or in a mortar base. Glass tiles are installed with adhesive. Porcelain tile on walls around showers or bathtubs must be installed over a moisture-resistant backing. Typically, adhesive is used to affix tiles to a moisture-resistant gypsum board in these areas. The joint between a bathtub or shower stall and wall finish is an obvious location for water leakage. Joints must be caulked with sealants that conform to CGSB standard CAN/CGSB-19.22-M: Mildew-Resistant Sealing Compound for Tubs and Tiles.
OTHER FINISHES Other products such as plywood, OSB, particleboard and lumber can be used for interior finishes. Lumber, plywood and medium density fibreboard (MDF) wainscoting are often used as decorative finishes. In this application, they are installed over and attached to the gypsum board finish. Typical softwood species include cedar, pine or hemlock; hardwoods include maple, birch or cherry.
Finishing Joints The taping and finishing of gypsum board should be done at 10°C (50°F) or higher. Before the joints are taped, remove all loose paper and clean the joints. Fill all joints wider than 3 mm (1⁄8 in.) with joint compound and let it dry. Protect external corners with metal corner beads, and tape inside corners using paper tape folded as shown in Figure 165. Joint compound is supplied premixed or in powder form that is mixed with water to a soft putty consistency. Apply the first layer of joint compound in a band 125 mm (5 in.) wide along the joint. Apply the tape and press it into the wet compound with a trowel or wide-blade putty knife. Remove excess compound, smooth the tape and feather the compound band to zero thickness at its outer edges. After the first layer has dried, apply a second layer in a band 200 mm (8 in.) wide on recessed joints and 250 mm (10 in.) wide where the edges of the board are not recessed. Feather the edges. Apply a third layer and feather to a band 250 to 300 mm (10 to 12 in.) wide on recessed joints and 400 mm (16 in.) on joints that are not recessed. Make this layer as smooth as possible to reduce sanding. When the third layer has set, sand the feathered edges lightly with fine sand paper and avoid damaging the paper surface of the gypsum board. Nail and screw heads and indentations in the centre of the board are filled with two layers of joint compound.
Nail and Screw Popping Popping can occur with both drywall nails and screws. It results from wood shrinkage and will likely occur, if at all, during the first heating season as the moisture content in the wood acclimatizes to the average humidity level in the house. Popping can be minimized by using framing lumber with a moisture content of not more than 19 per cent as stipulated in the NBC and nails or screws that are just long enough to meet code requirements so that a minimum length of fastener is embedded in the area where shrinkage takes place.
WALL TILE FINISHES Ceramic, porcelain, glass, marble and granite tiles are used for wall finishes in bathrooms and kitchen areas. Ceramic, porcelain, marble and granite tiles can be applied with an adhesive or in a mortar base. Glass tiles are installed with adhesive. Porcelain tile on walls around showers or bathtubs must be installed over a moisture-resistant backing. Typically, adhesive is used to affix tiles to a moisture-resistant gypsum board in these areas. The joint between a bathtub or shower stall and wall finish is an obvious location for water leakage. Joints must be caulked with sealants that conform to CGSB standard CAN/CGSB-19.22-M: Mildew-Resistant Sealing Compound for Tubs and Tiles.
OTHER FINISHES Other products such as plywood, OSB, particleboard and lumber can be used for interior finishes. Lumber, plywood and medium density fibreboard (MDF) wainscoting are often used as decorative finishes. In this application, they are installed over and attached to the gypsum board finish. Typical softwood species include cedar, pine or hemlock; hardwoods include maple, birch or cherry.
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