Roof Decking Thickness Osb

Keep in mind that the load of the roof still plays a role in the plywood thickness.

Roof decking thickness osb.

With edge support and the same snow load 3 8 inch osb can be used. Correct installation of roof sheathing will ensure the best. 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. A homeowner recently wrote and asked me the following regarding osb roof decking.

Osb is widely used as roof decking material. Common roof sheathing applications and installation recommendations are described in the related publications listed at right. Oriented strand board osb is commonly used as the primary structural sheathing component in residential construction and low rise commercial applications. Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones.

That s considered to be the minimum. Thicknesses range from 5 16 to 3 4 inch and the proper one to use. 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. When this is the case experts recommend a 5 8 inch thick sheet.

Osb panel products give engineers designers specifiers and builders a broad array of choices for use as subfloors combination floors wall and roof sheathing. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. Loads will vary with the pitch of the roof. 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.

Most roofs will be sheathed in plywood at least 3 8 inch thick. 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. Roof sheathing thickness unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. A flatter roof with rafters farther apart may need a thickness of up to inch.

Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood.