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.

Roof deck plywood thickness.

What is plank sheathing. 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. The minimum plywood for roofing plywood is layers of wood.

The minimum thickness of plywood used for roofing is 3 8 th of an inch. 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. The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an inch. The standard width is 4 feet.

Steeper rather than flatter roofs will have lesser load per sq. I would use 1 2 with clips in between the rafters if your centers are 24. You might be tempted to choose a inch thickness although it s unnecessary in most cases. Plywood is made with three or more layers of thin wood glued together with the grain.

Many factors affect thickness. 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. This kind of plywood can be used on roofs with minimal load.

However you may need to consider bolstering the plywood thickness for a roof that has a higher load. In this case plywood should be a minimum of 3 8 inch thick. If there is no such requirement 7 16 1 2 is fine if your rafter centers are 16.