Osb Thickness For Roof

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.

Osb thickness for roof.

The miami dade county board of county commissioners banned osb for use as roof sheathing after hurricane andrew destroyed thousands of homes in 1992. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. When this is the case experts recommend a 5 8 inch thick sheet. With edge support and the same snow load 3 8 inch osb can be used.

The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24. This riding arena was built using swiss krono osb f 15mm thick for the roof and 18mm thick for the walls. 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 viable alternative to plywood this osb board is engineered to prevent any cupping warping or splitting.

The roof of a riding arena made with strong panels consisting of 18mm thick swiss krono osb f. A homeowner recently wrote and asked me the following regarding osb roof decking. 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. A flatter roof with rafters farther apart may need a thickness of up to inch.

Osb is widely used as roof decking material. Oriented strand board osb is a material with high mechanical properties that make it particularly suitable for load bearing applications in construction. Keep in mind that the load of the roof still plays a role in the plywood thickness. For heavier loads a 40 20 rated panel 19 32 or 5 8 will support a 130 psf live load and 48 24 rated panels 23 32 or are good to175 psf.

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. Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. 25mm thick swiss krono osb 3 as a walkable subroof surface.

The most common uses are for sheathing in walls flooring and roof decking.