How Thick Is Plywood On Roof

The minimum thickness of plywood used for roofing is 3 8 th of an inch.

How thick is plywood on roof.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. 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. 8d ring shank nails should be used instead. The existing plywood on my roof is only 3 8.

Severe weather 1 2 in common douglas fir plywood sheathing application as 4 x 8. He said it s only a difference of 1 8 thickness. If your roof is more on the flatter side then it s. What is the actual thickness of a sheet of plywood.

A local roofer submitted a proposal to me for a roof placement that included replacing rotten plywood with 1 2 cdx. Foot and with a maximum of spacing of 16 inches between rafters. That s considered to be the minimum. Like most other things there is no one right answer for the plywood thickness of your roof.

Plywood is often sold in 1 4 1 2 or 3 4 nominal thicknesses but the actual thickness is often 1 32 thinner. Steeper rather than flatter roofs will have lesser load per sq. This kind of plywood can be used on roofs with minimal load. Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness.

Never attach roof sheathing with staples. 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. Plywood thickness for the roof. Sheet with varying 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. The most common plywood uses include support for floors walls roofs and garages in residential construction. I thought perhaps he made a mistake but no this is what he is proposing. Plywood typically comes in 4 8 ft.

A 3 4 sheet is actually 23 32 thick. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. The typical thickness range for sheathing is 3 8 to 3 4 inch.