Roof Deck Plywood Thickness

The thickness of plywood used for roof decking depends on the roof slope the spacing of.

Roof deck plywood thickness.

The standard width is 4 feet. Plywood is made with three or more layers of thin wood glued together with the grain. Osb that is made now holds up better than the old stuff used to. It s the standard for spacing of 24 inches in the rafter although as mentioned a 5 8 inch thick is more ideal.

You might be tempted to choose a inch thickness although it s unnecessary in most cases. Foot and with a maximum of spacing of 16 inches between rafters. The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an inch. However you may need to consider bolstering the plywood thickness for a roof that has a higher load.

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

You can get plywood sheets with a length of up to 10 feet. 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. This kind of plywood can be used on roofs with minimal load. The minimum thickness of plywood used for roofing is 3 8 th of an inch.

The minimum plywood for roofing plywood is layers of wood. A roof that lays practically flat will have a much heavier load than a steeper roof that allows rain snow and ice to roll right off. Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood.