Thickness Of Roof Plywood

An exception to this standard however may occur if you intend to install slate concrete or tile shingles on your roof.

Thickness of roof plywood. The most common scenario is a home that has rafters set approximately 16 inches apart. The thickness of plywood used for roof decking depends on the roof slope the spacing of. 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.

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. You can get plywood sheets with a length of up to 10 feet. The most common thickness of plywood is 1 2 inch but plywood thickness can range from 1 8 inch. Foot and with a maximum of spacing of 16 inches between rafters.

This kind of plywood can be used on roofs with minimal load. Standard roof sheathing which consists of 4 by 8 sheets of plywood or oriented strand board or osb is 1 2 inch thick and attaches directly to the roof rafters or the roof trusses. In this case plywood should be a minimum of 3 8 inch thick. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb.

A 1 2 sheet is actually 15 32 thick. The minimum thickness of plywood used for roofing is 3 8 th of an inch. With edge support and the same snow load 3 8 inch osb can be used. The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an inch.

You might be tempted to choose a inch thickness although it s unnecessary in most cases. Many factors affect thickness. The standard width is 4 feet. The minimum plywood for roofing plywood is layers of wood.

The most common size for plywood sheets is 4 x 8 feet followed by 5 x 5 feet. However you may need to consider bolstering the plywood thickness for a roof that has a higher load. It s the standard for spacing of 24 inches in the rafter although as mentioned a 5 8 inch thick is more ideal. A 3 4 sheet is actually 23 32 thick.

Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness.