Rigid XPS insulation for walls, foundations, slabs, and protected membrane roof systems.

Why builders specify DuPont™ Styrofoam™ Brand XPS

DuPont™ Styrofoam™ Brand XPS is engineered for projects where thermal performance has to hold up in real building conditions. Its closed-cell structure is positioned by DuPont as a core advantage because it helps the insulation resist moisture and retain long-term thermal performance, including in damp below-grade and exposed environments. DuPont also highlights broad code and standards alignment for the product family, including ASTM C578-based product types and IRC/IBC/IECC pathways through evaluation reports.

Within the Styrofoam™ Brand lineup, different products serve different assemblies: residential sheathing and cavity walls, foundation walls and slabs, tongue-and-groove board installations, commercial roof and plaza deck applications, and higher-load conditions where compressive strength matters. That makes this brand page useful not just as a product list, but as a starting point for understanding where DuPont’s XPS solutions fit best across residential and commercial construction.

DuPont™Styrofoam™Brand Scoreboard Extruded Polystyrene (XPS) Insulation is a grey, extruded polystyrene foam insulation board that is scored longitudinally on 16” and 24” centers, making it easy to size to commonly used widths, cut and install. It has excellent insulating characteristics, high resistance to water and water vapor, exceptional compressive strength and long-term durability.

Styrofoam™Brand Scoreboard XPS Insulation is designed for use in exterior cavity wall and foundation applications. Like all Styrofoam™ Brand Extruded Polystyrene products, Styrofoam™ Brand Scoreboard resists moisture to deliver a stable R-value over the long term.

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Explore DuPont™ Styrofoam™ Brand XPS insulation for walls, foundations, slabs, and roof systems. Shop moisture-resistant rigid insulation built for long-term thermal performance.

What makes Styrofoam™ Brand XPS stand out

  • Moisture resistance

    DuPont positions Styrofoam™ Brand XPS around its closed-cell structure and moisture resistance, emphasizing long-term performance even in standing water, wet soil, and other damp conditions. This is a major reason the product family appears so often in below-grade, slab, cavity wall, and exposed building-envelope applications.

  • Long-term thermal performance

    Styrofoam™ Brand XPS is promoted by DuPont for high, long-term R-value retention, with the broader product family centered around roughly R-5 per inch and select products such as Cavitymate™ Ultra and Ultra SL called out at R-5.6 per inch. This makes the brand particularly relevant where insulation value must stay dependable over time.

  • Strength across demanding assemblies

    The product family spans multiple compressive-strength tiers, with DuPont noting options from 15 psi up to 100 psi depending on the product. That range helps explain why Styrofoam™ Brand XPS appears in wall systems, foundations, slabs, cavity walls, commercial roofs, plaza decks, and other assemblies where durability and load resistance matter.

DuPont™ Styrofoam™ FAQs

What is DuPont™ Styrofoam™ Brand made from?

DuPont™ Styrofoam™ Brand is an extruded polystyrene (XPS) insulation product family. DuPont describes it as a closed-cell foam insulation system designed to provide moisture resistance and durable long-term thermal performance across multiple building applications.

Where are Styrofoam™ Brand XPS products commonly used?

Depending on the specific product, DuPont positions Styrofoam™ Brand XPS for sheathing, foundation walls, slab and below-grade work, masonry cavity walls, wet cavity wall environments, and roof or protected membrane roof applications. Different products in the lineup are optimized for different assemblies, so the intended application should always guide product selection.

Why is Styrofoam™ Brand XPS often chosen for moisture-prone applications?

A core reason is the product family’s closed-cell structure. DuPont repeatedly emphasizes moisture resistance, low water absorption behavior, freeze-thaw durability, and long-term R-value retention, which is why the brand is frequently used in foundation, slab, cavity wall, and other damp or exposed conditions.

Does DuPont™ Styrofoam™ Brand XPS come in different strength levels?

Yes. DuPont states that Styrofoam™ Brand XPS is available across a wide compressive-strength range, from lower-strength residential sheathing products to higher-load options that reach 60 psi or even 100 psi in specialized applications. That range is one of the reasons the lineup can serve everything from standard wall assemblies to more demanding infrastructure or roof-related use cases.

DuPont™ Styrofoam™ buying guides & resources

  • What Is XPS Insulation and Where Does DuPont™ Styrofoam™ Brand Fit Best?

    Understand what extruded polystyrene (XPS) insulation is, how closed-cell boards perform in moisture-prone assemblies, and where DuPont™ Styrofoam™ Brand products are commonly used across walls, foundations, slabs, and roof systems.

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  • DuPont™ Styrofoam™ for Walls, Foundations, and Slabs: How to Choose the Right Product

    Compare the logic behind sheathing boards, cavity-wall products, and below-grade solutions so you can choose the right Styrofoam™ Brand XPS option for the assembly you are actually building.

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  • Styrofoam™ Brand Roofmate™ and PMR Systems: What to Know Before You Specify

    Learn why protected membrane roof and green roof assemblies often call for moisture-resistant, durable insulation boards, and how Roofmate™ fits into DuPont’s roofing-focused XPS lineup.

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