Roof Deck Plywood Thickness

I would use 1 2 with clips in between the rafters if your centers are 24.

Roof deck plywood thickness.

Plywood is made with three or more layers of thin wood glued together with the grain. Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood. The minimum thickness of plywood used for roofing is 3 8 th of an inch. Steeper rather than flatter roofs will have lesser load per sq.

The standard width is 4 feet. Many factors affect thickness. The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an inch. This kind of plywood can be used on roofs with minimal load.

In this case plywood should be a minimum of 3 8 inch thick. Osb that is made now holds up better than the old stuff used to. Foot and with a maximum of spacing of 16 inches between rafters. You might be tempted to choose a inch thickness although it s unnecessary in most cases.

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. If there is no such requirement 7 16 1 2 is fine if your rafter centers are 16. What is plank sheathing. However you may need to consider bolstering the plywood thickness for a roof that has a higher load.

You can get plywood sheets with a length of up to 10 feet. It s the standard for spacing of 24 inches in the rafter although as mentioned a 5 8 inch thick is more ideal. The thickness of plywood used for roof decking depends on the roof slope the spacing of.