How Thick Osb For Roof Sheathing

Roof sheathing or decking is one of those elements.

How thick osb for roof sheathing. T g oriented strand board common. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. 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. 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.

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

Osb roof decking thickness 7 16 1 2 or 5 8. Keep the 16 oc go with 1 2 osb and add an extra clip in each space. In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood. Several factors must be considered when determining appropriate roof sheathing thickness such as the.

Osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. Tandg oriented strand board is ideal for subfloor construction and structural usage in humid conditions. Loads will vary with the. Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should.

Great choice for a professional builder. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.