Plywood Thickness For Roofing
A local roofer submitted a proposal to me for a roof placement that included replacing rotten plywood with 1 2 cdx.
Plywood thickness for roofing. Sheathing should be a minimum of 19 32 inch thick. When i was framing was ccpts for overhangs and cdx for the rest of the roof. If you want the shed to be waterproof its roof must be constructed just like any other roof a plywood decking covered with shingles or with composite or metal roofing. In the usa the standard was is.
It is an exterior grade plywood with a thickness just under 1 2 inch. Most builders use 15 32 cdx for the roof. 8d ring shank nails should be used instead. 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. He said it s only a difference of 1 8 thickness. The typical thickness range for sheathing is 3 8 to 3 4 inch. The existing plywood on my roof is only 3 8.
Sheet with varying thickness. I thought perhaps he made a mistake but no this is what he is proposing. If you want the shed to be waterproof its roof must be constructed just like any other roof a plywood decking covered with shingles or with composite or metal roofing. Size was 1 2 15 32 for 16 oc rafters and 5 8 19 32 for 24 spacing.
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. That s considered to be the minimum. Required dimensions of plywood for roofing.
1 2 could be used with ply clips on 24 oc rafters trusses. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. It is an exterior grade plywood with a thickness just under 1 2 inch. 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 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. Most builders use 15 32 cdx for the roof.
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