Osb Roof Sheathing Thickness

Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof.

Osb roof sheathing thickness.

Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. 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.

Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. What size plywood for the roof. Keep in mind that the load of the roof still plays a role in the plywood thickness. Watch this now to learn how to avoid this same pr.

Allowable spans for lumber floor and roof sheathing a b for si. When this is the case experts recommend a 5 8 inch thick sheet. 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.

Roof sheathing or decking is one of those elements. With edge support and the same snow load 3 8 inch osb can be used. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7.

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. Thicknesses range from 5 16 to 3 4 inch and the proper one to use. In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood.