Plywood Thickness For Roofing

The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an inch.

Plywood thickness for roofing.

The thickness of plywood used for roof decking depends on the roof slope the spacing of. That s considered to be the minimum. The most common size for plywood sheets is 4 x 8 feet followed by 5 x 5 feet. Foot and with a maximum of spacing of 16 inches between rafters.

The minimum plywood for roofing plywood is layers of wood. When this is the case experts recommend a 5 8 inch thick sheet. That s considered to be the minimum. Steeper rather than flatter roofs will have lesser load per sq.

Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. The most common thickness of plywood is 1 2 inch but plywood thickness can range from 1 8 inch. The minimum thickness of plywood used for roofing is 3 8 th of an inch. A flatter roof with rafters farther apart may need a thickness of up to inch.

Many factors affect thickness. With edge support and the same snow load 3 8 inch osb can be used. Plywood is made with three or more layers of thin wood glued together with the grain. Sheets of 7 16 inch thick with no edge support can be used in an area where the snow load is 30 pounds per square foot.

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. Osb and plywood come in thicknesses ranging from 5 16 to 3 4 inch and the thickness needed for a particular roof depends on several factors including rafter spacing expected load and roof. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. We also carry pre cut project panels that are available in different sizes that may vary by store.