Wall sheathing description

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 or intermediate fastening between supports.

Several types of sheathing are used: plywood, OSB, lumber, rigid insulation, fibreboard and gypsum board.

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