Exterior wall sheathing strengthens the wall system provides a nailing base for the siding and gives a layer of protection against outside elements.
Exterior wall sheathing thickness.
Foam board thicknesses range from 3 8 inch to 4 1 4 inches.
But in practice most walls with too thin foam won t fail.
Exterior wall sheathing is either structural or non structural.
So companies like norbord started creating tallwall windstorm panels to help alleviate this.
Exterior gypsum sheathing is available in 1 2 5 8 thick 4 wide square edge product.
Structural exterior wall sheathing ties framing studs together making the walls resistant to twisting and bending.
5 8 exterior gypsum sheathing has a type x core for use in fire rated assemblies.
Gypsum wallboard manufactured by american gypsum contains no asbestos.
Standard panels are 2 by 8 4 by 8 and 4 by 9 feet although some can be purchased in fan folded panels that run up to 50 feet long.
For covering existing siding 1 2 inch and 3 4 inch thicknesses are commonly used.
In theory builders should make sure that any rigid foam installed on the exterior side of wall sheathing is thick enough to keep the sheathing above the dew point during the winter.