If you only intend to use boards as cladding for visual effect they can be relatively thin.

Thickness of osb for flooring. A thickness of 18mm is adequate for non loadbearing uses in dry conditions. For osb it s 23 32 inch. Plywood shed flooring is usually 3 4 inch and osb 5 8 inch thick. Osb may have greater shear strength the ability to span distances than comparable thickness of plywood.

Subfloor floor covering or finish floor is the term for the topmost eventual floor the floor that you walk on and see. However as joist spacing increases. Osb can be used for subfloors although it is not as common as cdx. If they are any thinner than that there can be a risk of swelling and warping.

Using osb for flooring osb comes in plywood sized sheets that are typically 4 feet wide and either 8 9 or 10 feet long with thickness ranging from 3 8 to 1 1 8 inches. For joist spans 19 2 24 inches nwfa installation guidelines recommend a minimum panel thickness of 7 8 inch osb or plywood. We re in dallas so we don t engineer for tremendous live loads for an asphalt shingle and we feel making a shed floor strong and durable secrets of shed for a good shed floor start with quality materials a good plan and then watch the workmanship wooden shed flooring buy sheds direct as with roof bracing shed flooring is not normally a top consideration when selecting. Osb roof decking thickness 7 16 1 2 or 5 8 currently we space rafters 16 oc and use 7 16 osb with h clips.

Structurally osb and plywood are very similar in strength and ability to hold nails or screws. Osb has the appearance of giant cornflakes pressed together to form structural panels in sizes similar to plywood such as 4 x 8 x 5 8. In germany both osb 3 and osb 4 are used for loadbearing purposes. For 23 32 inch thick panels the joists should be at least.

For 19 32 inch thick panels the joists should be 20 inches on center. In metric terms sheets are typically 1220 mm x 2440 mm and have thickness from 9 5 to 28 5 mm.

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