How Thick Is Roofing Plywood

One of the most important factors when selecting the plywood for your roof is how thick each piece should be.

How thick is roofing plywood.

The existing plywood on my roof is only 3 8. He said it s only a difference of 1 8 thickness. That s considered to be the minimum. 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. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick.

Plywood thickness for the roof. Steeper rather than flatter roofs will have lesser load per sq. I thought perhaps he made a mistake but no this is what he is proposing. Sheathing should be a minimum of 19 32 inch thick.

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. When used in flooring plywood functions as the subfloor that supports hardwoods tile and carpet floors. A local roofer submitted a proposal to me for a roof placement that included replacing rotten plywood with 1 2 cdx. Loads will vary with the pitch of the roof.

This kind of plywood can be used on roofs with minimal load. 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. 8d ring shank nails should be used instead. The most common thickness of plywood is 1 2 inch but plywood thickness can range from 1 8 inch to 3 4 inches.

That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Most roofs will be sheathed in plywood at least 3 8 inch thick. Never attach roof sheathing with staples. 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.

Foot and with a maximum of spacing of 16 inches between rafters.