Osb Sheathing Thickness For Roofs

With edge support and the same snow load 3 8 inch osb can be used.

Osb sheathing thickness for roofs.

The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24. 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. Thicknesses range from 5 16 to 3 4 inch and the proper one. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that.

For pricing and availability. 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. Plywood s advantage over osb. 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.

Panel thickness will also affect permeability using the 2 perm variable of 7 16ths osb sheathing at 3 4 thickness the permeability drops to 2 3rds of a perm. 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. For pricing and availability. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.

Keep in mind that the load of the roof still plays a role in the plywood thickness. A homeowner recently wrote and asked me the following regarding osb roof decking. Using osb osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. That in a nutshell is the one big advantage plywood holds over osb.

Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. Thermostat 7 16 cat ps2 10 osb sheathing application as 4 x 8. When this is the case experts recommend a 5 8 inch thick sheet. Osb sheathing 15 32 cat ps2 10 osb sheathing application as 4 x 8.

Osb is widely used as roof decking material. A flatter roof with rafters farther apart may need a thickness of up to inch. 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.