OSB Board & OSB3 Boards | 9mm, 11mm & 18mm OSB

OSB board is commonly used for flooring, roofing, wall sheathing, timber frame construction, loft flooring, sheds, workshops and general building projects. The correct board type and thickness depends on the application.

OSB3 is a classification of oriented strand board under BS EN 300. It is a load-bearing board intended for use in humid conditions and is widely used for structural construction applications.

9mm OSB3 is commonly used for wall sheathing, timber frame work, sheds, workshops, joinery and general construction where a thinner structural sheet is appropriate.

11mm OSB3 is commonly used for wall sheathing, roofing, timber frame construction and other building applications where a structural engineered wood panel is specified.

18mm OSB3 is commonly used for flooring and subfloor applications. Suitability depends on support spacing, loading, fixing and the overall floor construction.

An 8x4 OSB sheet is commonly supplied as 2440 x 1220mm. Plywood Etc also supplies a range of smaller and part-sheet OSB sizes.

OSB3 is designed for load-bearing use in humid conditions, but it should not be considered completely waterproof. Prolonged exposure to water or weather can affect OSB, so the board should be protected and installed appropriately.

OSB is manufactured from oriented wood strands, whereas plywood is manufactured from layers of wood veneer. Both are available in structural grades, but they have different construction, characteristics and applications.

Yes. OSB3 is commonly used as structural wall sheathing within suitable timber frame and construction systems. The thickness and fixing method should follow the project specification.

The correct thickness depends on the intended application, support spacing, loading and construction method. For structural work, always follow the relevant design and installation requirements rather than selecting board thickness on application alone.