How Thick Is Roofing Plywood

Plywood thickness for the roof.

How thick is roofing plywood. 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 design. If your roof is more on the flatter side then it s. When used in flooring plywood functions as the subfloor that supports hardwoods tile and carpet floors. The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an.

The most common thickness of plywood is 1 2 inch but plywood thickness can range from 1 8 inch to 3 4 inches. A local roofer submitted a proposal to me for a roof placement that included replacing rotten plywood with 1 2 cdx. I thought perhaps he made a mistake but no this is what he is proposing. Foot and with a maximum of spacing of 16 inches between rafters.

One of the most important factors when selecting the plywood for your roof is how thick each piece should be. Steeper rather than flatter roofs will have lesser load per sq. The minimum thickness of plywood used for roofing is 3 8 th of an inch. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. He said it s only a difference of 1 8 thickness. 8d ring shank nails should be used instead. When used for roofing plywood panels are covered and protected by a variety of building materials that keep the elements at bay including roof felt underlayment flashing and shingles.

The existing plywood on my roof is only 3 8. 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. The typical thickness range for sheathing is 3 8 to 3 4 inch. Like most other things there is no one right answer for the plywood thickness of your roof.

Sheathing should be a minimum of 19 32 inch thick. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. That s considered to be the minimum. This kind of plywood can be used on roofs with minimal load.

Never attach roof sheathing with staples.