Plywood Thickness For Roofing

With edge support and the same snow load 3 8 inch osb can be used.

Plywood thickness for roofing.

That s considered to be the minimum. Foot and with a maximum of spacing of 16 inches between rafters. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. The most common thickness of plywood is 1 2 inch but plywood thickness can range from 1 8 inch.

The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an inch. A flatter roof with rafters farther apart may need a thickness of up to inch. The minimum thickness of plywood used for roofing is 3 8 th of an 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. 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. 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.

Steeper rather than flatter roofs will have lesser load per sq. Plywood is made with three or more layers of thin wood glued together with the grain. 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. This kind of plywood can be used on roofs with minimal load.

That s considered to be the minimum. Keep in mind that the load of the roof still plays a role in the plywood thickness. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. When this is the case experts recommend a 5 8 inch thick sheet.