Plywood Roof Sheathing Thickness

Required sheathing thickness for roofing important factors.

Plywood roof sheathing thickness.

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. 1 inch 25 4 mm 1 pound per square foot 0 0479 kn m2. 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.

A flatter roof with rafters farther apart may need a thickness of up to inch. When this is the case experts recommend a 5 8 inch thick sheet. Plywood is made with three or more layers of thin wood glued together with the grain. 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. Keep in mind that the load of the roof still plays a role in the plywood thickness. Many factors affect thickness. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood.

That s considered to be the minimum. That s considered to be the minimum.