Plywood Sheathing Thickness Roof

Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively.

Plywood sheathing thickness roof.

It adds proven performance and durability to new homes room additions and renovations. The typical thickness range for sheathing is 3 8 to 3 4 inch. That s considered to be the minimum. The thickness of plywood used for roof decking depends on the roof slope the spacing of rafters and the weight of other material to be put over the decking as well as the design load the.

Sheathing should be a minimum of 19 32 inch thick. What size plywood for the roof. A 4 8 sheet of plywood is 32 ft 2. As a quick primer in plywood each side is rated from a to d.

1 inch 25 4 mm. Never attach roof sheathing with staples. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. A is smooth and knot free while d the lowest quality has missing knots and cracks.

Osb and plywood come in thicknesses ranging from 5 16 to 3 4 inch and the thickness needed for a particular roof depends on several factors including rafter spacing expected load and roof design. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Once you have the area you can divide by the area of a sheet of plywood to find the number of sheets needed. This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesn t have too much load.

The common grade of plywood for roof sheathing is cdx. It should be placed up on the roof. If your roof is more on the flatter side then it s. 8d ring shank nails should be used instead.

If your roof has triangles and other shapes you ll need to use a calculator to find the square footage. A flatter roof with rafters farther apart may need a thickness of up to inch. Another issue that many people encounter is what size plywood the roof may need. Keep in mind that the load of the roof still plays a role in the plywood thickness.

So dividing the area of the roof by 32 will give you the number of. Fortunately this is one issue that has primarily been standardized. Plywood sheathing delivers outstanding rigidity strength and versatility and is an excellent choice for.