Plywood Roof Sheathing Thickness

The thickness of plywood used for roof decking depends on the roof slope the spacing of.

Plywood roof sheathing thickness.

That s considered to be the minimum. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. The minimum plywood for roofing plywood is layers of wood. 1 inch 25 4 mm 1 pound per square foot 0 0479 kn m2.

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. 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. That s considered to be the minimum. Plywood is made with three or more layers of thin wood glued together with the grain.

When this is the case experts recommend a 5 8 inch thick sheet. A flatter roof with rafters farther apart may need a thickness of up to inch. Required sheathing thickness for roofing important factors. 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.

Many factors affect thickness. Keep in mind that the load of the roof still plays a role in the plywood thickness.