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LP SmartGuard Treated 350 TopNotch

LP® TopNotch® 350 Premium OSB Sub-Flooring With SmartGuard® delivers strength, stiffness and premium moisture resistance at a great price. It creates a strong, smooth surface ready for your finished flooring application. The easy, self-spacing tongue-and-groove profile speeds installation with no special tools or handling. Our proprietary SmartGuard process provides lasting defense against termites and fungal decay. Backed with a 100-Day "No-Sand" Warranty and a 25-Year Transferable Limited Warranty.


  • Strength, Stiffness and Premium Moisture Resistance at a Great Price
  • Easy Self-Spacing Tongue-and-Groove Profile
  • Moisture-Resistant Edge Seal
  • 100-Day "No-Sand" Warranty
  • 50-Year Transferable Limited Warranty