unit 31 structural wall sheathing. sheathing inner layer of the outside wall not part of the wall...
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Structural Wall Sheathing
Sheathing Inner layer of the outside wall Not part of the wall framing Structural part of the home Insulated sheathing requires diagonal bracing Requires corner bracing Can be applied when the:
Roof has been framed Wall is completely framed and lying on the subfloor Wall frames have been erected, plumbed, and braced
Types of Sheathing
Wood Edge types
Shiplap Square
Needed for butt joinery Dressed and matched
Tongue and groove Should be applied horizontally or diagonally
Types of Sheathing
Plywood Adds great strength and rigidity Twice as strong as walls sheathed with diagonal
boards Applied horizontally or vertically (usually vertically) Comes in 4’ x 8’ sheets…..or longer in length Minimum of 5/16” thick
Types of Sheathing
Gypsum Consists of two layers of lightweight paper with
gypsum filler Comes in 2’ X 8’ sheets Should be applied horizontally Nailed in place with 1-3/4” to 2” galvanized roofing
nails
Sheathing
Carpenters prefer to add sheathing as soon as possible because…………. Scaffolding is available for roof framing The structure is more rigid There is a more solid structure for the ceiling and roof
Sheathing materials
Building paper Applied between the sheathing and siding Should be water resistant but not vapor resistant Should be applied horizontally
House wraps Made of fibrous plastic Allows water vapor to pass through Very durable, not easily torn