Plywood Roof Sheathing Thickness

Several factors must be considered when determining appropriate roof sheathing thickness such as the.

Plywood roof sheathing thickness.

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 minimum plywood for roofing plywood is layers of wood. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. When this is the case experts recommend a 5 8 inch thick sheet.

1 inch 25 4 mm 1 pound per square foot 0 0479 kn m2. Many factors affect thickness. Required sheathing thickness for roofing important factors. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick.

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

Keep in mind that the load of the roof still plays a role in the plywood thickness. A flatter roof with rafters farther apart may need a thickness of up to inch.