Standard Roof Plywood Thickness

An exception to this standard however may occur if you intend to install slate concrete or tile shingles on your roof.

Standard roof plywood thickness.

Loads will vary with the pitch of the roof. Plywood alternatives you can use other types of boards in place of true plywood. The weight of a plywood sheet will proportionally increase with increasing in width length and thickness. Steeper rather than flatter roofs will have lesser load per sq.

A 3 4 sheet is actually 23 32 thick. The standard width is 4 feet. Foot and with a maximum of spacing of 16 inches between rafters. The minimum thickness of plywood used for roofing is 3 8 th of an inch.

Standard roof sheathing which consists of 4 by 8 sheets of plywood or oriented strand board or osb is 1 2 inch thick and attaches directly to the roof rafters or the roof trusses. Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness. You might be tempted to choose a inch thickness although it s unnecessary in most cases. Sheathing should be a minimum of 19 32 inch thick.

The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an inch. The most common thickness of plywood is 1 2 inch but plywood thickness can range from 1 8 inch to 3 4 inches. It s the standard for spacing of 24 inches in the rafter although as mentioned a 5 8 inch thick is more ideal. This kind of plywood can be used on roofs with minimal load.

Most roofs will be sheathed in plywood at least 3 8 inch thick. You can get plywood sheets with a length of up to 10 feet. 3 4 thick plywood will weigh about 2 5 pounds per square foot psf. 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. And the whole 4 x 8 sheet will be approximately 84 lb. Plywood is often sold in 1 4 1 2 or 3 4 nominal thicknesses but the actual thickness is often 1 32 thinner. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.

The typical thickness range for sheathing is 3 8 to 3 4 inch.