Used by top builders and carried by leading suppliers, LP® TopNotch® 350 Durable Sub-Flooring is designed for optimum stability in both directions and its smooth surface is sanded to lay flat. LP TopNotch 350 creates a strong, smooth foundation for a variety of finished flooring. We back LP TopNotch 350 with a 200-day "no-sand" warranty and a 50-year transferable limited warranty.
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