Commercial | Interior Wall

For well-insulated and highly durable walls and ceilings

As an insulation and interior finish system for walls and ceilings, DuPont™ Thermax™ Heavy Duty Insulation stands up to tough indoor challenges with a fiberglass core and aesthestic white thermoset-coated aluminum facing.


Thermax™ Heavy Duty

DuPont™ Thermax™ Heavy Duty Insulation is an easy-to-install, easy-to-clean insulation and interior finish system for walls and ceilings in metal, wood post frame, and concrete or masonry buildings, as governed by building codes. It consists of a glass-fiber-reinforced polyisocyanurate foam core faced with nominal 4-mil embossed white thermoset-coated aluminum on one side and 1.25-mil embossed aluminum on the other. The tough 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). The heavy-duty facers help prevent water and water vapor intrusion into the insulation foam, allowing it to stabilize at a higher R-value for high, long-term thermal resistance. Used in conjunction with the appropriate joint closure system for the application, DuPont™ Thermax™ Heavy Duty Insulation – with its low perm rating – can help to reduce moisture condensation within and behind the insulation.

DuPont™ Thermax™ Brand insulation delivers wall performance you can count on. It’s ready to meet your toughest building challenges – both outside and inside the wall – with a robust ISO insulation product line and an R-value that’s proven consistent over time and a range of temperatures.


Features & benefits

Easy to cut, handle, and install
  • Easy to use
  • Moisture Resistant
  • Reduces the potential for condensation within the wall assembly (SH-295)

    Physical Properties

      Method Unit Value
    Water Absorption<sup></sup> ASTM C209 % by volume, max. 0.1
    Water Vapor Permeance<sup></sup> ASTM E96 perm, max <0.03
    Maximum Use Temperature<sup></sup> - °F 250
    Flexural Strength<sup></sup> ASTM C203 psi, min. 55
    Light Reflectance, Visual Light Spectrophotometer<sup></sup> - % 65
    Compressive Strength<sup>1</sup> ASTM D1621 psi, min. 25

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


    Available Sizes

    R-Value Thickness (in.) Board Size (ft.)
    3.3 0.5 4 x 20
    6.5 1 4 x 20
    13 2 4 x 20
    13 2 4 x 23
    15.8 2.5 4 x 8