Osb Thickness For Roof Sheathing

For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.

Osb thickness for roof sheathing.

Roof sheathing thickness unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. However you might find that osb can better suit your needs than plywood for the roof. 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. They can range from the standard 4 x 8 piece to a 4 x 9 or even a 4 x 10.

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. Because of its construction some manufacturers actually make larger sheets of osb. Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. Thicknesses range from 5 16 to 3 4 inch and the proper one to use.

Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively. Thermostat 7 16 cat ps2 10 osb sheathing application as 4 x 8. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. With edge support and the same snow load 3 8 inch osb can be used.

For pricing and availability. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. 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 sheathing 15 32 cat ps2 10 osb sheathing application as 4 x 8.

1 inch 25 4 mm. Allowable spans for lumber floor and roof sheathing a b for si. That s considered to be the minimum. With this thickness any deflection under dead loads only the weight of materials only should prove to be imperceptible.

For pricing and availability. 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.