Roof Deck Plywood Thickness

What is plank sheathing.

Roof deck plywood 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 minimum plywood for roofing plywood is layers of wood. I would use 1 2 with clips in between the rafters if your centers are 24. Steeper rather than flatter roofs will have lesser load per sq.

Many factors affect thickness. You can get plywood sheets with a length of up to 10 feet. 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. Your local code may require you to use 5 8 or some other thickness.

You might be tempted to choose a inch thickness although it s unnecessary in most cases. The thickness of plywood used for roof decking depends on the roof slope the spacing of. If there is no such requirement 7 16 1 2 is fine if your rafter centers are 16. 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.

Plywood is made with three or more layers of thin wood glued together with the grain. However you may need to consider bolstering the plywood thickness for a roof that has a higher load. 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 standard width is 4 feet. 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.