Oriented strand board
Oriented strand board', commonly called 'OSB', is a type of particle board which is made of carefully positioned strands of wood. Aspen and other similar woods are cut into long strands parallel to the grain of the wood. It is manufactured into sheets made up of wood strands, wax, and resin adhesives. Sheets are formed under pressure and heat. The finished sheet size varies by country. OSB is very strong making it ideal for building construction. Its most common uses in construction are for covering walls, floors and roofs before the finish products are applied.