Tempo:
Wall Sheathing and Exterior Finishes
Wall sheathing is the outside covering used over the wall framework. It is nailed directly to the wall framing members and provides a nailing base for some types of siding and backing for others. Certain wall sheathing materials such as plywood and OSB are very effective in providing lateral bracing. Insulating sheathing materials will not normally provide the required temporary or permanent bracing, and let-in braces of wood or metal are used when bracing is needed. Sheathing must be applied to the gable ends and walls when the exterior cladding is a type that requires solid backing (see Figure 68) or intermediate fastening between supports. Several types of sheathing are used: plywood, OSB, lumber, rigid insulation, fibreboard and gypsum board. Table 28 (p. 294) lists types of sheathing and the minimum thickness necessary to provide sufficient backing for exterior finishing materials.
TYPES AND INSTALLATION OF SHEATHING OSB is a structural panel made from wood strands that are bonded together under heat and pressure with a waterproof, phenolic adhesive. The strands in the outer faces are oriented along the longitudinal axis of the panel, giving added strength and rigidity in the long direction. The panels are manufactured in sheets 1.2 m (4 ft.) wide and usually 2.4 m (8 ft.) long. The O-1 or O-2 designation indicates an oriented panel, while an R1 designation indicates a panel containing randomly arranged wafers (waferboard). It must be at least 7.9 mm (5⁄16 in.) thick for studs up to 600 mm (24 in.) on centre and 6.35 mm (1⁄4 in.) for studs up to 400 mm (16 in.) on centre. OSB is often identified with a panel mark rating rather than a thickness. When using rated OSB, the panel mark rating must correspond to the stud spacing (Table 28 on p.294).
Wall sheathing is the outside covering used over the wall framework. It is nailed directly to the wall framing members and provides a nailing base for some types of siding and backing for others. Certain wall sheathing materials such as plywood and OSB are very effective in providing lateral bracing. Insulating sheathing materials will not normally provide the required temporary or permanent bracing, and let-in braces of wood or metal are used when bracing is needed. Sheathing must be applied to the gable ends and walls when the exterior cladding is a type that requires solid backing (see Figure 68) or intermediate fastening between supports. Several types of sheathing are used: plywood, OSB, lumber, rigid insulation, fibreboard and gypsum board. Table 28 (p. 294) lists types of sheathing and the minimum thickness necessary to provide sufficient backing for exterior finishing materials.
TYPES AND INSTALLATION OF SHEATHING OSB is a structural panel made from wood strands that are bonded together under heat and pressure with a waterproof, phenolic adhesive. The strands in the outer faces are oriented along the longitudinal axis of the panel, giving added strength and rigidity in the long direction. The panels are manufactured in sheets 1.2 m (4 ft.) wide and usually 2.4 m (8 ft.) long. The O-1 or O-2 designation indicates an oriented panel, while an R1 designation indicates a panel containing randomly arranged wafers (waferboard). It must be at least 7.9 mm (5⁄16 in.) thick for studs up to 600 mm (24 in.) on centre and 6.35 mm (1⁄4 in.) for studs up to 400 mm (16 in.) on centre. OSB is often identified with a panel mark rating rather than a thickness. When using rated OSB, the panel mark rating must correspond to the stud spacing (Table 28 on p.294).
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