DuPont™ Thermax™ Metal Building Board

Commercial | Residential | Multifamily | Wall

Easy installation in walls and ceilings

Ideal for metal structures as well as standing seam metal roofs, Thermax™ Metal Building Boards deliver long-term R-value and are listed in 1-, 2-, 3- and 4-hour UL fire rated wall assemblies.


DuPont™ Thermax™ Metal Building Board

Thermax™ Metal Building Board* provides both insulation value and an interior finish system for walls in metal buildings as well as in standing seam metal roofs. It consists of a polyisocyanurate foam core with 1.25 mil embossed aluminum facers on both sides and a Sound Transmission Classification (STC) of 15. Thermax™ Metal Building Board offers high, long-term thermal resistance, with facers that help prevent water and water vapor intrusion into the insulation foam allowing it to stabilize at a higher R-value. Used in conjunction with the appropriate joint closure system for the application, Thermax™ Metal Building Board – with its low perm rating – can help to reduce moisture condensation within and behind the insulation

* Thermax™ Metal Building Board is a former product of The Dow Chemical Company


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

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


    Available sizes


    Thickness (in) R-Value Board Size (feet) 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