Osb Thickness For Roof

Osb is widely used as roof decking material.

Osb thickness for roof.

Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24. Watch this now to learn how to avoid this same pr. 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.

Thicknesses range from 5 16 to 3 4 inch and the proper one to use. Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. 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. However osb is generally considered less resistant to water it swells in thickness when exposed to moisture and some people prefer plywood for roofs and subfloors.

With edge support and the same snow load 3 8 inch osb can be used. When this is the case experts recommend a 5 8 inch thick sheet. A homeowner recently wrote and asked me the following regarding osb roof decking. Keep in mind that the load of the roof still plays a role in the plywood thickness.

Osb roof decking thickness 7 16 1 2 or 5 8 if were using osb we get 9 16 we dont worry about getting both 7 16 and 9 16 for walls then the roof we just get all of the same. 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. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. The miami dade county board of county commissioners banned osb for use as roof sheathing after hurricane andrew destroyed thousands of homes in 1992.

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