Plywood Thickness For Roofing

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.

Plywood thickness for roofing.

The thickness of plywood used for roof decking depends on the roof slope the spacing of. This kind of plywood can be used on roofs with minimal load. 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. Steeper rather than flatter roofs will have lesser load per sq.

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

Plywood is made with three or more layers of thin wood glued together with the grain. The most common size for plywood sheets is 4 x 8 feet followed by 5 x 5 feet. The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an inch. We also carry pre cut project panels that are available in different sizes that may vary by store.

That s considered to be the minimum. 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. Many factors affect thickness.

With edge support and the same snow load 3 8 inch osb can be used. The minimum thickness of plywood used for roofing is 3 8 th of an inch. Foot and with a maximum of spacing of 16 inches between rafters. The most common thickness of plywood is 1 2 inch but plywood thickness can range from 1 8 inch.