Plywood Roof Sheathing Thickness

Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood.

Plywood roof sheathing thickness.

Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood. The minimum plywood for roofing plywood is layers of wood. Many factors affect thickness.

The thickness of plywood used for roof decking depends on the roof slope the spacing of. That s considered to be the minimum. 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. Keep in mind that the load of the roof still plays a role in the plywood thickness.

That s considered to be the minimum. A flatter roof with rafters farther apart may need a thickness of up to inch. This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesn t have too much load. Plywood is made with three or more layers of thin wood glued together with the grain.

Several factors must be considered when determining appropriate roof sheathing thickness such as the. Allowable load psf for wood structural panel roof sheathing continuous over two or more spans and strength axis parallel to supports plywood structural panels are five ply five layer unless otherwise noted a b for si.