Osb Thickness For Roof Sheathing

1 inch 25 4 mm.

Osb thickness for roof sheathing.

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. It will support roof. Osb sheathing 15 32 cat ps2 10 osb sheathing application as 4 x 8. That s considered to be the minimum.

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 rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. 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 rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.

However you might find that osb can better suit your needs than plywood for the roof. This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesn t have too much load. Because of its construction some manufacturers actually make larger sheets of osb. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively.

Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. For pricing and availability. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7. Thermostat 7 16 cat ps2 10 osb sheathing application as 4 x 8.

With edge support and the same snow load 3 8 inch osb can be used. With this thickness any deflection under dead loads only the weight of materials only should prove to be imperceptible. Allowable spans for lumber floor and roof sheathing a b for si. For pricing and availability.

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