How Thick Osb For Shed Roof

The osb thickness will be based on the rafter spacing.

How thick osb for shed roof.

For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. Plywood shed flooring is usually 3 4 inch and osb 5 8 inch thick. Osb is fine all the way around.

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. 18mm was initially chosen for its strength. It will support roof. 7 16 will be fine for 16 on center and 5 8 for 24 on center rafters.

Osb may have greater shear strength the ability to span distances than comparable thickness of plywood. A viable alternative to plywood this osb board is engineered to prevent any cupping warping or splitting. 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. With this thickness any deflection under dead loads only the weight of materials only should prove to be imperceptible.

Using oriented strand board is a tested way of reducing costs for building your shed. Plywood with similar properties currently costs about 30 more for an equivalent thickness. Roofing plywood sizes material wood joist and plywood or osb decking oriented strand board common 15 32 in roof decking material thickness osb or plywood for roofs walls roof deck materials to ensure a le. With edge support and the same snow load 3 8 inch osb can be used.

Why waste ply on a roof unless its rough shuttering ply 12mm wbp is perfectly fine if your feeling really tight osb 3 aka stirling board will do the trick i figured hardwood plywood would be a better choice since it s more substantial. Oriented strand board osb is a material with high mechanical properties that make it particularly suitable for load bearing applications in construction. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. However there are some sceptics out there who doubt the strength and durability of 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. The most common uses are for sheathing in walls flooring and roof decking.