Exterior Insulation - Thermax™ | DuPont
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Exterior Insulation - Thermax™ | DuPont

  • Available in

  • Use

    Exterior board insulation
  • Applications

    Commercial, residential
  • Characteristics

    Long-term thermal performance, dimensional stability, immediate insulation, weather protection
  • Sizes

    48" x 96", 48 x 144" in typical thicknesses of 0.625", 1.0", 1.55", 2.0", 2.5", 3.0"
  • Certification

    Complies with ASTM Type I, Class 2
  • Guarantee

    20 years
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More about this product

The DuPont Thermax™ product line is a systematic approach to achieving efficiency at every level: simplified design, streamlined construction and optimized energy consumption for a reduced carbon footprint.

DuPont Thermax™ Exterior Insulation features a unique fiberglass-reinforced foam core, delivring one of the highest R-values available for immediate insulation and weather protection on the job site.

Thermax™ is a rigid foam board insulation with a glass-fiber-reinforced polyisocyanurate foam core that helps improve fire performance and dimensional stability designed for immediate insulation and weather protection, as well as long-term thermal performance.


  • Easy to cut, handle, and install
  • Moisture resistant
  • Helps reduce the potential for condensation within the wall assembly
  • Provies air and water protection
  • Long-term thermal resistance
  • R-Value of 6.9 at 1" thickness

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