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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.