How Thick Osb For Shed Roof
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For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.
How thick osb for shed roof. The most common uses are for sheathing in walls flooring and roof decking. A viable alternative to plywood this osb board is engineered to prevent any cupping warping or splitting. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. 8 tips for getting the best out of your oriented strand board osb how to install roof sheathing pro builder.
Using oriented strand board is a tested way of reducing costs for building your shed. With edge support and the same snow load 3 8 inch osb can be used. The osb thickness will be based on the rafter spacing. However there are some sceptics out there who doubt the strength and durability of osb.
18mm was initially chosen for its strength. 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 may have greater shear strength the ability to span distances than comparable thickness of plywood. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that.
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. 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 this thickness any deflection under dead loads only the weight of materials only should prove to be imperceptible. 7 16 will be fine for 16 on center and 5 8 for 24 on center rafters.
Plywood with similar properties currently costs about 30 more for an equivalent thickness. 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. It will support roof. 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 fine all the way around. Plywood shed flooring is usually 3 4 inch and osb 5 8 inch thick.