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.

Osb thickness for roof.

The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24. The roof of a riding arena made with strong panels consisting of 18mm thick swiss krono osb f. 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. This riding arena was built using swiss krono osb f 15mm thick for the roof and 18mm thick for the walls.

With edge support and the same snow load 3 8 inch osb can be used. 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. Keep in mind that the load of the roof still plays a role in the plywood thickness. 25mm thick swiss krono osb 3 as a walkable subroof surface.

A flatter roof with rafters farther apart may need a thickness of up to inch. A homeowner recently wrote and asked me the following regarding osb roof decking. Osb is widely used as roof decking material. A viable alternative to plywood this osb board is engineered to prevent any cupping warping or splitting.

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. The most common uses are for sheathing in walls flooring and roof decking. For the curious 7 16 osb has a span rating of 24 16 and with supports every 24 inches is good for a roof live load of 40 psf pounds per square foot with a 10 psf dead load. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood.

When this is the case experts recommend a 5 8 inch thick sheet. Oriented strand board osb is a material with high mechanical properties that make it particularly suitable for load bearing applications in construction. Thicknesses range from 5 16 to 3 4 inch and the proper one to use. 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.

The miami dade county board of county commissioners banned osb for use as roof sheathing after hurricane andrew destroyed thousands of homes in 1992.