Roof Deck Plywood Thickness

Osb that is made now holds up better than the old stuff used to.

Roof deck plywood thickness.

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. Foot and with a maximum of spacing of 16 inches between rafters. The minimum plywood for roofing plywood is layers of wood. If there is no such requirement 7 16 1 2 is fine if your rafter centers are 16.

The minimum thickness of plywood used for roofing is 3 8 th of an inch. What is plank sheathing. The thickness of plywood used for roof decking depends on the roof slope the spacing of. In this case plywood should be a minimum of 3 8 inch thick.

Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood. Plywood is made with three or more layers of thin wood glued together with the grain. You might be tempted to choose a inch thickness although it s unnecessary in most cases. It s the standard for spacing of 24 inches in the rafter although as mentioned a 5 8 inch thick is more ideal.

The standard width is 4 feet. The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an inch. You can get plywood sheets with a length of up to 10 feet. I would use 1 2 with clips in between the rafters if your centers are 24.

Many factors affect thickness. However you may need to consider bolstering the plywood thickness for a roof that has a higher load. 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.