Oriented Strand Boards (OSB) are engineered panels formed by layering strands of wood in specific orientations. It is compressed and bonded together using wax and resin adhesives. There are two main types, OSB 2 for use in dry conditions and OSB 3 use in humid or damp conditions. Typical uses include floors, walls, roofs and hoardings. Conforms to BSEN 636-2; structural class CE2+.