The Owens Corning® FOAMULAR® NGX™ C-300 Extruded Polystyrene (XPS) Rigid Insulation Board is a premium closed-cell rigid foam insulation designed for residential, commercial, and institutional construction. Engineered for applications requiring enhanced compressive strength, FOAMULAR® C-300 provides excellent thermal performance, superior moisture resistance, and long-term durability. With an insulating value of R-5 per inch and a 30 psi compressive strength, it is ideal for foundation walls, under concrete slabs, exterior continuous insulation, basement walls, and other below-grade applications. Manufactured using Owens Corning's NGX™ technology, the board utilizes a next-generation blowing agent with significantly reduced global warming potential while maintaining the trusted performance of FOAMULAR® insulation. 

Each board measures 1.5" × 24" × 96" and features shiplap edges to reduce thermal bridging and improve the continuity of the insulation layer. Each board covers 16 square feet, and each bundle contains 16 boards, providing a total coverage of 256 square feet. The closed-cell XPS construction resists moisture absorption, maintains its insulating properties over time, and is GREENGUARD Gold Certified for healthier indoor environments.

Owens Corning® FOAMULAR® NGX™ C-300 Extruded Polystyrene (XPS) Rigid Foam Insulation is a closed cell, highly moisture-resistant rigid foam board well suited to meet the needs for a wide variety of residential and commercial construction applications.