What Thickness Of Plywood Is Used For Roofing

A flatter roof with rafters farther apart may need a thickness of up to inch.

What thickness of plywood is used for roofing.

3 ply is one of the most common types of plywood. Instead it is used to hold concrete whilst it sets. 3 8 should be replaced optimally but it would be better to use all the same thickness sheathing than to mix them. Many factors affect thickness.

The thickness of plywood used for roof decking depends on the roof slope the spacing of. Plywood is made with three or more layers of thin wood glued together with the grain. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood. And this will reduce the life of the shingles tar paper and roof.

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. Keep in mind that the load of the roof still plays a role in the plywood thickness. Roof sheathing thickness unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Steeper rather than flatter roofs will have lesser load per sq.

Required sheathing thickness for roofing important factors. Generally plywood comes in 4 by 8 foot sheets and in a variety of grades. The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an inch. The minimum plywood for roofing plywood is layers of wood.

Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. This kind of plywood can be used on roofs with minimal load. 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. Shuttering plywood is another type of plywood but it generally isn t used in roofing.

5 ply is a versatile type of plywood that is about 4 millimeters thick. That s considered to be the minimum. Foot and with a maximum of spacing of 16 inches between rafters. If you mix thicknesses of plywood it will cause a problem eventually and the thicker sheathing will be noticeable probably within a month.

It is about 2 to 3 millimeters thick and is generally used indoors since it looks more decorative than thicker plywood boards. The minimum thickness of plywood used for roofing is 3 8 th of an inch.