How Thick Osb For Roof Sheathing

It spans the rafters to support the roofing and in the case of panel sheathing such as plywood or osb it acts as a diaphragm with the walls to resist horizontal loads.

How thick osb for roof sheathing.

Osb roof decking thickness 7 16 1 2 or 5 8. Required sheathing thickness for roofing important factors. Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof. Several factors must be considered when determining appropriate roof sheathing thickness such as the.

In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood. For the curious 7 16 osb has a span rating of 24 16 and with supports every 24 inches is good for a roof live load of 40 psf pounds per square foot with a 10 psf dead load. Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should. 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.

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. Keep the 16 oc go with 1 2 osb and add an extra clip in each space. Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones.

T g oriented strand board common. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood. Thicknesses range from 5 16 to 3 4 inch and the proper one to use. Tandg oriented strand board is ideal for subfloor construction and structural usage in humid conditions.

Loads will vary with the. Great choice for a professional builder. Roof sheathing or decking is one of those elements.