Osb Roof Sheathing Thickness

What size plywood for the roof.

Osb roof sheathing thickness.

Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively. With this thickness any deflection under dead loads only the weight of materials only should prove to be imperceptible. When this is the case experts recommend a 5 8 inch thick sheet.

That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Roof sheathing or decking is one of those elements. With edge support and the same snow load 3 8 inch osb can be used. Loads will vary with the.

Watch this now to learn how to avoid this same pr. 1 inch 25 4 mm. Allowable spans for lumber floor and roof sheathing a b for si. 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. 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. Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof.

Keep in mind that the load of the roof still plays a role in the plywood thickness. In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb.