Elevate your subfloor game with the LP® TopNotch® 350 Durable Subfloor. Engineered for strength and designed to withstand the unpredictable elements of a jobsite, this 3/4" OSB (Oriented Strand Board) panel is the industry standard for a flat, stable foundation.

Key Features

Advanced Moisture Resistance: Built with a specialized moisture-resistant resin, these panels are designed to handle rain and humidity during construction without swelling or delaminating.

The "Rain-Drain" System: Features a unique notch system that allows standing water to drain away quickly, reducing the need for sanding and keeping your project on schedule.

Exceptional Stability: Provides a stiff, flat surface that minimizes floor squeaks and provides a rock-solid base for hardwood, tile, or carpet.

Easy Installation: Each panel features a Tongue & Groove (T&G) profile, ensuring a snug fit and easy alignment between boards.

Sustainably Sourced: LP uses SFI® certified wood fibers, making this an environmentally conscious choice for modern builds.

Technical Specifications

Why Choose LP 350?

Standard OSB can be a headache when the weather turns. LP 350 is the "Goldilocks" of subflooring—offering significantly more durability than commodity board without the premium price tag of high-end structural panels. It’s the smart choice for builders who want a squeak-free floor and a smooth inspection.

Pro Tip: For the best results and a "Quiet Guarantee," pair these panels with a high-quality subfloor adhesive.