Roof Decking Thickness Osb

That s considered to be the minimum.

Roof decking thickness osb.

Thicknesses range from 5 16 to 3 4 inch and the proper one to use. Common roof sheathing applications and installation recommendations are described in the related publications listed at right. 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. Osb panel products give engineers designers specifiers and builders a broad array of choices for use as subfloors combination floors wall and roof sheathing.

With edge support and the same snow load 3 8 inch osb can be used. Sheets of 7 16 inch thick with no edge support can be used in an area where the snow load is 30 pounds per square foot. A homeowner recently wrote and asked me the following regarding osb roof decking. Loads will vary with the pitch of the roof.

Oriented strand board commonly referred to as osb is a type of engineered lumber similar to particle board formed by adding adhesives and then compressing layers of wood strands. Roof sheathing thickness unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. When this is the case experts recommend a 5 8 inch thick sheet.

Osb roof decking thickness 7 16 1 2 or 5 8 currently we space rafters 16 oc and use 7 16 osb with h clips. Plywood and oriented strand board osb are used in roof sheathing systems ranging from simple single family residences to large commercial buildings. We re in dallas so we don t engineer for tremendous live loads for an asphalt shingle and we feel comfortable with 16 oc rafter spacing and 7 16 osb decking. Oriented strand board osb is commonly used as the primary structural sheathing component in residential construction and low rise commercial applications.

Most roofs will be sheathed in plywood at least 3 8 inch thick. Correct installation of roof sheathing will ensure the best. Osb is widely used as roof decking material. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood.

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