Osb Roof Sheathing Thickness

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. 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.

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Osb sheathing 15 32 cat ps2 10 osb sheathing application as 4 x 8.

Osb roof sheathing thickness.

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. 1 inch 25 4 mm. With this thickness any deflection under dead loads only the weight of materials only should prove to be imperceptible.

Cdx works fine in 1 2 or 5 8 thickness. Some roofers or manufacturers don t like to install over skip sheathing but i ve never had a problem with it locally. Thicknesses range from 5 16 to 3 4 inch and the proper one to use. Thermostat 7 16 cat ps2 10 osb sheathing application as 4 x 8.

Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively. For pricing and availability. For pricing and availability. With edge support and the same snow load 3 8 inch osb can be used.

Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7. Page 6 of 7 v1 0 01 2008 osb roof design example calculations using asd 4x8 foot 24 16 teco sheathing span. 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. Allowable spans for lumber floor and roof sheathing a b for si.

I ve never used commodity osb on a roof but it s probably fine in 5 8 thickness and possibly in 1 2 thickness.

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