Tempo:
Gypsum board sheathing consists of a gypsum filler faced on both sides with treated paper or a fibreglass matt facer. It should be at least 12.7 mm (1⁄2 in.) thick for studs 600 mm (24 in.) on centre and 9.5 mm (3⁄8 in.) thick for studs 400 mm (16 in.) on centre. It is made in sheets 1.22 m (4 ft.) wide and 2.44 m (8 ft.) long. The sheets are applied horizontally across the studs and nailed to the framing members. Insulating sheathing is non-structural. One type is a semi-rigid, glass-fibre panel with an exterior vapour-permeable, waterproof membrane. Another type is made of mineral fibre and has no membrane. Other types of rigid panels are made of expanded polystyrene, extruded polystyrene, polyurethane, isocyanurate or phenolic material. They are available in different
thicknesses, and the insulating value per unit thickness varies. Rigid glass fibre sheathing with a vapour-permeable membrane can serve as an air barrier when the joints are sealed with sheathing tape. Lumber sheathing, which should not be less than 17 mm (11⁄16 in.) thick, is used in boards 140 to 286 mm (6 to 12 in. nominal) wide. It is milled in a shiplap, tongue-and-groove or square-edge pattern. The boards are nailed at each stud with two nails for 140 to 184 mm (6 to 8 in.) widths and three for 235 to 286 mm (10 to 12 in.) widths. Longer nails are required in areas susceptible to extreme wind or earthquake forces. End joints in the board must be placed over the centre of the studs with the joints staggered on different studs. Lumber sheathing may be applied either horizontally or diagonally (Figure 108)
108 Lumber sheathing application Horizontal and diagonal wall lumber sheathing
Horizontal application joint foundation
Diagonal lumber floor sheathing
Diagonal application stud 45º
sheathing joist foundation wall
thicknesses, and the insulating value per unit thickness varies. Rigid glass fibre sheathing with a vapour-permeable membrane can serve as an air barrier when the joints are sealed with sheathing tape. Lumber sheathing, which should not be less than 17 mm (11⁄16 in.) thick, is used in boards 140 to 286 mm (6 to 12 in. nominal) wide. It is milled in a shiplap, tongue-and-groove or square-edge pattern. The boards are nailed at each stud with two nails for 140 to 184 mm (6 to 8 in.) widths and three for 235 to 286 mm (10 to 12 in.) widths. Longer nails are required in areas susceptible to extreme wind or earthquake forces. End joints in the board must be placed over the centre of the studs with the joints staggered on different studs. Lumber sheathing may be applied either horizontally or diagonally (Figure 108)
108 Lumber sheathing application Horizontal and diagonal wall lumber sheathing
Horizontal application joint foundation
Diagonal lumber floor sheathing
Diagonal application stud 45º
sheathing joist foundation wall
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