Structurally osb and plywood are very similar in strength and ability to hold nails or screws.

Thickness of osb for flooring. 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. In metric terms sheets are typically 1220 mm x 2440 mm and have thickness from 9 5 to 28 5 mm. 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. Osb can be used for subfloors although it is not as common as cdx.

However as joist spacing increases. Plywood shed flooring is usually 3 4 inch and osb 5 8 inch thick. For 23 32 inch thick panels the joists should be at least. Subfloor floor covering or finish floor is the term for the topmost eventual floor the floor that you walk on and see.

If you only intend to use boards as cladding for visual effect they can be relatively thin. Osb may have greater shear strength the ability to span distances than comparable thickness of plywood. If they are any thinner than that there can be a risk of swelling and warping. A thickness of 18mm is adequate for non loadbearing uses in dry conditions.

For 19 32 inch thick panels the joists should be 20 inches on center. 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 osb it s 23 32 inch.

For joist spans 19 2 24 inches nwfa installation guidelines recommend a minimum panel thickness of 7 8 inch osb or plywood. Osb stands for oriented strand board.

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