Grade 3 OSB (Oriented Strand Board) is a versatile and durable engineered wood product, ideal for a variety of construction and DIY projects. Made from compressed layers of wood strands and adhesives as well as being known for its strength and moisture resistance, Grade 3 OSB is perfect for use in load-bearing applications and environments with high humidity. Ideal for subflooring, wall and roof sheathing, and other structural uses. Available in 8' by 4' dimensions at a thickness of 11mm or 18mm. Available for delivery (charge applies at checkout) or collection from our yard. Please note: Timber is a natural product. Finish, colour and sizes may vary from illustration and description. While every care is taken to provide you the best material, with it being natural it can move, split, warp, twist, swell and shrink.