Roof Deck Plywood Thickness

Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood.

Roof deck plywood thickness.

The minimum thickness of plywood used for roofing is 3 8 th of an inch. Plywood is made with three or more layers of thin wood glued together with the grain. Foot and with a maximum of spacing of 16 inches between rafters. If the plywood thickness is less than or the osb less than 7 16 it is going to be weak with the roof rafters spaced the standard 2 on center.

It s the standard for spacing of 24 inches in the rafter although as mentioned a 5 8 inch thick is more ideal. The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an inch. Your local code may require you to use 5 8 or some other thickness. Osb that is made now holds up better than the old stuff used to.

Many factors affect thickness. The standard width is 4 feet. I would use 1 2 with clips in between the rafters if your centers are 24. You can get plywood sheets with a length of up to 10 feet.

The minimum plywood for roofing plywood is layers of wood. Steeper rather than flatter roofs will have lesser load per sq. This kind of plywood can be used on roofs with minimal load. What is plank sheathing.

If there is no such requirement 7 16 1 2 is fine if your rafter centers are 16. In this case plywood should be a minimum of 3 8 inch thick. The thickness of plywood used for roof decking depends on the roof slope the spacing of.