UNIT 31

Structural Wall Sheathing

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

Types of Sheathing

OSB Oriented Strand Board Replaces plywood

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