DuPont™ Thermax™ Light Duty Foam Insulation

Commercial | Residential | Multifamily | Wall

Designed for easy installation and continuous insulation

Equipped with a fiberglass-reinforced foam core, Thermax™ Light Duty Insulation combines long-term thermal resistance with facers that prevent water and water vapor intrusion.


DuPont™ Thermax™ Light Duty Foam Insulation

DuPont™ Thermax™ Light Duty Insulation is designed as an insulation and interior finish system for walls and ceilings in metal, wood post frame and concrete or masonry buildings, as governed by building codes. Thermax™ Light Duty consists of a glass-fiber-reinforced polyisocyanurate foam core faced with nominal 1.25 mil embossed white thermoset-coated aluminum on one side and 1.25 mil embossed aluminum on the other. The tough 1.25 mil white embossed aluminum surface makes it a durable insulation/finish choice for use in moderate-impact areas, and it can be pressure-washed up to 2,000 psi with a 15-degree or greater spray tip (at 3’ minimum distance).


Features & benefits

Feature Benefit
Easy to cut, handle, and install
  • Easy to use
  • Moisture Resistant
  • Reduces the potential for condensation within the wall assembly

    Physical properties

    Method Unit Value
    Compressive Strength1 ASTM D1621 psi, min. 25
    Water Absorption ASTM C209 % by volume, max. 0.1
    Water Vapor Permeance ASTM E96 perm, max <0.03
    Maximum Use Temperature - °F 250
    Flexural Strength ASTM C203 psi, min. 55
    Light Reflectance, Visual Light Spectrophotometer - % 65

    1 Vertical compressive strength is measured at 10 percent deformation or at yield, whichever occurs first


    Available sizes


    Thickness (in) R-Value Board Size (ft) Edge Treatment
    0.5 3.3 4 x 8, 4 x 12 Square Edge
    .75 5.0 4 x 8, 4 x 12 Square Edge
    1.0 6.5 4 x 8, 4 x 12 Square Edge
    1.55 9.8 4 x 8, 4 x 12 Square Edge, Shiplap
    2.0 13.0 4 x 8, 4 x 12 Square Edge, Shiplap