Plywood Thickness For Roofing

Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb.

Plywood thickness for roofing.

Keep in mind that the load of the roof still plays a role in the plywood thickness. The most common thickness of plywood is 1 2 inch but plywood thickness can range from 1 8 inch. 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. The thickness of plywood used for roof decking depends on the roof slope the spacing of.

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. With edge support and the same snow load 3 8 inch osb can be used. A flatter roof with rafters farther apart may need a thickness of up to inch.

The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an inch. This kind of plywood can be used on roofs with minimal load. Foot and with a maximum of spacing of 16 inches between rafters. 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.

The most common size for plywood sheets is 4 x 8 feet followed by 5 x 5 feet. Steeper rather than flatter roofs will have lesser load per sq. We also carry pre cut project panels that are available in different sizes that may vary by store. When this is the case experts recommend a 5 8 inch thick sheet.

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. Many factors affect thickness. The minimum thickness of plywood used for roofing is 3 8 th of an inch. That s considered to be the minimum.