Osb Roof Sheathing Thickness

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.

Osb roof sheathing thickness. In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood. Keep in mind that the load of the roof still plays a role in the plywood thickness. Allowable spans for lumber floor and roof sheathing a b for si. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7.

Thicknesses range from 5 16 to 3 4 inch and the proper one to use. What size plywood for the roof. 1 inch 25 4 mm. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.

With this thickness any deflection under dead loads only the weight of materials only should prove to be imperceptible. 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. Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof. Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones.

A flatter roof with rafters farther apart may need a thickness of up to inch. When this is the case experts recommend a 5 8 inch thick sheet. With edge support and the same snow load 3 8 inch osb can be used. Watch this now to learn how to avoid this same pr.

I m halfway though sheeting the roof of my shipping container shop and already need to redo some of it. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively. Loads will vary with the.