How Thick Is Plywood On Roof

A local roofer submitted a proposal to me for a roof placement that included replacing rotten plywood with 1 2 cdx.

How thick is plywood on roof.

Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. 8d ring shank nails should be used instead. A 3 4 sheet is actually 23 32 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. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. I thought perhaps he made a mistake but no this is what he is proposing. The typical thickness range for sheathing is 3 8 to 3 4 inch.

That s considered to be the minimum. Plywood is often sold in 1 4 1 2 or 3 4 nominal thicknesses but the actual thickness is often 1 32 thinner. Plywood thickness for the roof. Steeper rather than flatter roofs will have lesser load per sq.

What is the actual thickness of a sheet of plywood. The existing plywood on my roof is only 3 8. He said it s only a difference of 1 8 thickness. 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. Foot and with a maximum of spacing of 16 inches between rafters. The most common plywood uses include support for floors walls roofs and garages in residential construction. This kind of plywood can be used on roofs with minimal load.

The thickness of plywood used for roof decking depends on the roof slope the spacing of rafters and the weight of other material to be put over the decking as well as the design load the. 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. Plywood typically comes in 4 8 ft. Like most other things there is no one right answer for the plywood thickness of your roof.

Severe weather 1 2 in common douglas fir plywood sheathing application as 4 x 8. Never attach roof sheathing with staples. Sheet with varying thickness.