XPS R-5 1 in. x 4 ft. x 8 ft. (32 sq. ft.) Rigid Foam Board Insulation

About This Product

Owens Corning FOAMULAR® NGX F-150 is a next-generation extruded polystyrene (XPS) rigid foam board engineered for dependable thermal performance with a smaller environmental footprint. Produced with an advanced blowing agent, it dramatically reduces global warming potential compared to legacy FOAMULAR products while keeping the proven durability and insulating power the XPS R-5 1 in. x 4 ft. x 8 ft. (32 sq. ft.) Rigid Foam Board Insulation is known for.

This 1 in. thick, 4 ft. x 8 ft. panel covers 32 sq. ft. and delivers R-5 thermal resistance. The scored square edge (SSE) lets you snap the board into smaller widths without special tools, and the lightweight panels are easy to score, cut, and install. FOAMULAR NGX resists moisture and retains its insulating value even after exposure to water, making it well suited for basement walls, crawl spaces, garages, foundations, and exterior sheathing. Long-lasting performance is backed by a limited lifetime warranty.

Key Features

• High thermal performance with R-5 at 1 in. thickness

• Advanced formulation reduces global warming potential by up to 90%

• Scored square edge (SSE) snaps cleanly into smaller widths

• Moisture-resistant with excellent R-value retention in wet conditions

• Lightweight, durable, and easy to cut with standard tools

• Unfaced, formaldehyde-free panel resists mold and mildew

• 15 psi compressive strength (F-150); FOAMULAR family available up to 100 psi

• Installs on concrete, plywood, and wood for interior or exterior use

• Suitable for basements, crawl spaces, foundations, exterior walls, and sheathing

• ENERGY STAR® listed and GREENGUARD certified for low emissions

• Does not contain HFC 134a

• Must be covered with a 15-minute thermal barrier, such as drywall

• Not intended for soundproofing and does not have an STC rating

• Always verify local building codes for vapor barrier requirements

• Acrylic or latex paints may be used if applying finishes