What Thickness Of Plywood Is Used For Roofing

Many factors affect thickness.

What thickness of plywood is used for roofing.

Keep in mind that the load of the roof still plays a role in the plywood thickness. Shuttering plywood is another type of plywood but it generally isn t used in roofing. The minimum plywood for roofing plywood is layers of wood. 3 ply is one of the most common types of plywood.

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. The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an inch. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. Several factors must be considered when determining appropriate roof sheathing thickness such as the.

That s considered to be the minimum. Generally plywood comes in 4 by 8 foot sheets and in a variety of grades. Plywood is made with three or more layers of thin wood glued together with the grain. Required sheathing thickness for roofing important factors.

Steeper rather than flatter roofs will have lesser load per sq. When this is the case experts recommend a 5 8 inch thick sheet. 3 8 should be replaced optimally but it would be better to use all the same thickness sheathing than to mix them. It is about 2 to 3 millimeters thick and is generally used indoors since it looks more decorative than thicker plywood boards.

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 thickness of plywood used for roof decking depends on the roof slope the spacing of. Instead it is used to hold concrete whilst it sets. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood.

Roof sheathing thickness unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. 5 ply is a versatile type of plywood that is about 4 millimeters thick. The minimum thickness of plywood used for roofing is 3 8 th of an inch. A flatter roof with rafters farther apart may need a thickness of up to inch.

If you mix thicknesses of plywood it will cause a problem eventually and the thicker sheathing will be noticeable probably within a month. And this will reduce the life of the shingles tar paper and roof.