Underlayment Plywood, 1-1/8 in x 4 ft x 8 ft - Douglas Fir, Pressure Treated, Tongue & Groove. 1-1/8X4X8 Sif F/F Ply Trt Unt. Underlayment grade Plywood - this product is 1-1/8 in thick, 4 ft wide by 8 ft long and is made from Douglas Fir. This product is also pressure treated, tongue & groove.

Item Features

• Douglas Fir is the major species produced in the West, with more volume shipped than any other species and its sterling performance history is recognized the world over
• Underlayment grade particle board is cheaper, denser and more uniform than conventional wood and plywood
• Plywood is a versatile and durable wood product with uniform strength along grains regardless of direction
• Pressure-treated with preservative agents to protect against termites, decay and rot; tongue and groove joints allow the boards to be joined strongly together and function as a single flat surface