Roof Thickness Plywood

Loads will vary with the pitch of the roof.

Roof thickness plywood.

Here at roofing superstore we have a range of plywood boards that can be used for your project. Steeper rather than flatter roofs will have lesser load per sq. 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. The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an inch.

An exception to this standard however may occur if you intend to install slate concrete or tile shingles on your roof. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Roof decking is the material that lies on top of the main roofing structure and the underlayment and roof covering are applied on top. A 3 4 sheet is actually 23 32 thick.

However you may need to consider bolstering the plywood thickness for a roof that has a higher load. The minimum thickness of plywood used for roofing is 3 8 th of an inch. What is the actual thickness of a sheet of plywood plywood is often sold in 1 4 1 2 or 3 4 nominal thicknesses but the actual thickness is often 1 32 thinner. Foot and with a maximum of spacing of 16 inches between rafters.

Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness. This kind of plywood can be used on roofs with minimal load. In roofing plywood can be used as roof decking. In this case plywood should be a minimum of 3 8 inch thick.

That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.