Siding Sheathing Thickness

Bs 1403 6 flood resistance.

Siding sheathing thickness.

Our easy to install zip system sheathing and tape streamlines the weatherization process that delivers moisture and air protection with a water and air barrier. Foam board thicknesses range from 3 8 inch to 4 1 4 inches. Vinyl siding can be installed over common wood sheathings such as plywood oriented strand board osb or other materials e g foam plastic insulating sheathing. The two most common types of foam board sheathing materials are extruded polystyrene or polyisocyanurate.

According to the california uniform building code the minimum recommended thickness for structural panels used in wall sheathing is 5 16 inch for studs 16 inches on center and 3 8 inch for studs. Minimum plywood thickness the international residential code specifies 3 8 inch plywood for sheathing walls with a standard stud spacing of 16 inches if the siding is nailed to the studs through. The next piece above it should be allowed a 1 8 expansion joint ending at the top plate or at the midway point of the next rim joist. Polyisocyanurate has higher per inch insulation r values up to r 8 7 per inch than polystyrene.

Apa rated sheathing 2. The thickness of wood sheathing counts toward the total thickness that the fasteners must penetrate into nailable material usually 1 1 4 32mm. Structural exterior wall sheathing ties framing studs together making the walls resistant to twisting and bending. Exterior wall sheathing strengthens the wall system provides a nailing base for the siding and gives a layer of protection against outside elements.

The siding shall be applied over sheathing or materials listed in section 2304 6. Adhesive bond classification 5. Mill thickness declaration reference standards performance category mill number 5 0 specification 1. The astm e1354 test shall be conducted on specimens at the thickness intended for use in the horizontal orientation and at an incident radiant heat flux of 50 kw m 2.

Exterior wall sheathing is either structural or non structural. For multi story buildings the sheathing on the bottom should extend down to the bottom of the lowest framing member extend to the halfway point on rim joist as shown in red.