Osb Sheathing Thickness For Roofs

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. 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. 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.

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Thicknesses range from 5 16 to 3 4 inch and the proper one.

Osb sheathing thickness for roofs.

Thermostat 7 16 cat ps2 10 osb sheathing application as 4 x 8. 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. With edge support and the same snow load 3 8 inch osb can be used. For pricing and availability.

Keep in mind that the load of the roof still plays a role in the plywood thickness. A flatter roof with rafters farther apart may need a thickness of up to inch. For pricing and availability. A homeowner recently wrote and asked me the following regarding osb roof decking.

That in a nutshell is the one big advantage plywood holds over osb. The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. Osb is widely used as roof decking material.

The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. When this is the case experts recommend a 5 8 inch thick sheet. 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. 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.

Osb sheathing 15 32 cat ps2 10 osb sheathing application as 4 x 8. 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. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. 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.

Plywood s advantage over osb. It will support roof. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.

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