Oriented strand board (OSB) is a type of engineered wood similar to particle board, formed by adding adhesives and then compressing layers of wood strands (flakes) in specific orientations.

Oriented strand board (OSB) is a building material made from shredded or flaked timber particles. OSB is often used for similar purposes as plywood or fibreboard. Its name is taken from the placement of the individual timber particles it is made from, which are aligned by a machine, and coated in resin and wax. Each layer is laid perpendicular to the previous in order to maximise the strength of the finished product. Once the desired thickness has been achieved, the strands are heated and pressed together to result in a board that is strong, thin, durable and flexible.