Osb Roof Sheathing Thickness

Allowable spans for lumber floor and roof sheathing a b for si.

Osb roof sheathing thickness.

Osb sheathing 15 32 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. Thicknesses range from 5 16 to 3 4 inch and the proper one to use. 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. 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. I ve never used commodity osb on a roof but it s probably fine in 5 8 thickness and possibly in 1 2 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.

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. With edge support and the same snow load 3 8 inch osb can be used. Some roofers or manufacturers don t like to install over skip sheathing but i ve never had a problem with it locally. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb.

Cdx works fine in 1 2 or 5 8 thickness. For pricing and availability. Page 6 of 7 v1 0 01 2008 osb roof design example calculations using asd 4x8 foot 24 16 teco sheathing span. 1 inch 25 4 mm.

With this thickness any deflection under dead loads only the weight of materials only should prove to be imperceptible.