Plywood Roof Sheathing Thickness

A flatter roof with rafters farther apart may need a thickness of up to inch.

Plywood roof sheathing thickness.

Keep in mind that the load of the roof still plays a role in the plywood 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. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively.

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. That s considered to be the minimum. Plywood subflooring 3 8 plywood plywood roof sheathing 3 4 plywood 4x8 3 4 sheathing plywood 48 24 sheathing plywood. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7.

That s considered to be the minimum. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. Many factors affect thickness. This video may depict some work practices that do not meet current safety standards.

Required sheathing thickness for roofing important factors. Produced by apa the engineered wood association formerly the american plywood association in 1989. 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. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Several factors must be considered when determining appropriate roof sheathing thickness such as the. Avoid roof complaints with proper framing sheathing and roofing techniques.