Osb Thickness For Roof Sheathing

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.

Osb thickness for roof sheathing.

With edge support and the same snow load 3 8 inch osb can be used. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. Because of its construction some manufacturers actually make larger sheets of osb. That s considered to be the minimum.

Thicknesses range from 5 16 to 3 4 inch and the proper one to use. Roof sheathing thickness unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.

For pricing and availability. Allowable spans for lumber floor and roof sheathing a b for si. For pricing and availability. With this thickness any deflection under dead loads only the weight of materials only should prove to be imperceptible.

However you might find that osb can better suit your needs than plywood for the roof. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7. Osb sheathing 15 32 cat ps2 10 osb sheathing application as 4 x 8. Thermostat 7 16 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. You need to find a sheathing with a span rating of at least 32 16 which means either 15 32 or 1 2 thick osb. 1 inch 25 4 mm. 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.

It will support roof. Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones.