The Owens Corning FOAMULAR 150 XPS 4ft x 8ft Insulation Board is a closed-cell, moisture-resistant rigid foam board built for a wide range of residential and commercial uses. It’s tough, trustworthy, and a little more boringly efficient than your average insulation—perfect for when you want to do the job right without drama.

Please note we cannot ship to the following states: California, Colorado, Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Rhode Island, Vermont, Virginia, Washington.

Key Features & Design

• Board size: 4 ft x 8 ft (32 Sq Ft per board)
• Material: FOAMULAR® 150 Extruded Polystyrene XPS Rigid Foam Insulation
• R-Value by thickness (per 32 Sq Ft board): 0.5" = R3, 1" = R5, 1.5" = R7.5, 2" = R10, 2.5" = R12.5, 3" = R15
• Performance: Excellent long-term stable insulating performance at R-5 per inch
• Moisture resistance: Exceptional moisture resistance, long-term durability
• Handling: Lightweight, durable rigid foam panels are easy to handle and install
• Workability: Easy to saw, cut or score with a scored square edge

Applications & Design Details

• High-performance FOAMULAR®150 Extruded Polystyrene XPS Rigid Foam Insulation for wall furring, perimeter/foundation, cavity wall, pre-cast concrete, crawl spaces, sheathing, and other applications
• Retards the transmission of water vapor and moisture in masonry walls
• Provides continuous insulation over steel stud framing, in insulated concrete sandwich panel walls, or in masonry unit cavity walls, or when used with non-penetrating, surface mounted furring systems over masonry or concrete walls
• Insulates and retains its properties in below-grade perimeter and foundation applications, to complement the insulating sheathing envelope around the building framing
• Provides a weather-resistant barrier (when joints are sealed) to enhance the building resistance to air and moisture penetration
• XPS Rigid Foam Insulation is great for below-grade applications. XPS is resistant to degradation from the components of common soils and will retain its insulating performance characteristics even after prolonged exposure to moisture

Technical & Safety Details

• Combustibility: This product is combustible. A protective barrier or thermal barrier is required as specified in the appropriate building code.
• Material classification: FOAMULAR® 150 Extruded Polystyrene XPS Rigid Foam Insulation is a non-structural material.
• Exposure: FOAMULAR® XPS Insulation can be left exposed for up to 60 days. During that time some degradation or “dusting” of the polystyrene surface may begin. Once covered, the deterioration stops.
• Service temperature: FOAMULAR® 150 Extruded Polystyrene XPS Rigid Foam Insulation has a maximum service temperature of 165°F.
• Horizontal applications: For horizontal applications, always turn the black print side down.
• Ventilation & coverings: Do not cover FOAMULAR® XPS Insulation either stored (factory wrapped or unwrapped), or partially installed, with dark-colored (non-white), or clear (non-opaque) coverings and leave it exposed to the sun.

Ideal for installers who want dependable insulation that’s easy to handle and proven over time. Choose FOAMULAR® 150 XPS for reliable performance across walls, foundations, and below-grade projects—without the drama.