DuPont™ Thermax™ XARMOR™ (ci) Exterior Foam Insulation

Commercial | Residential | Multifamily | Wall

Use on walls and ceilings up to 30 feet high

Optimized to place behind rain screen exteriors, Thermax™ XARMOR™ (ci) Exterior Insulation is the toughest insulation available for the Thermax™ Wall System. A 4.0 mil embossed exterior foil facer provides durability and long-term performance. 


DuPont™ Thermax™ XARMOR™ (ci) Exterior Foam Insulation

Thermax™ XARMOR™ (ci)* is the toughest insulation for the patented Thermax™ Wall System. Designed for continuous insulation, Thermax™ XARMOR™ (ci)’s glass-fiber-reinforced polyisocyanurate foam core is homogenous – featuring finer cell size and better cell orientation, reducing wormholes and knit lines – resulting in one of the highest R-values(2) available (R-6.5 at 1”) for immediate insulation and weather protection on the job site, as well as long-term thermal performance.

* Thermax™ XARMOR™ (ci) Exterior Insulation 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
    Thermal Resistance1 ASTM C518 R-value, min 6.5
    Compressive Strength2 ASTM D1621 psi, min. 25
    Water Absorption ASTM C209 % by volume, max. 0.1
    Water Vapor Permeance3 ASTM E96 perm, max <0.04
    Maximum Use Temperature - °F 250
    Flexural Strength ASTM C203 psi, min. 55
    Flame Spread ASTM E84 - 25
    Smoke Developed ASTM E84 - <450

    1 Aged R-value at 1” of cured foam @ 75°F mean temperature. R-value expressed in ft2 •h•°F/Btu. R-value determined by ASTM C518 using the aging process in ASTM C1289 (90 days @ 140°F).

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

    3 Calculated flammability values for this or any other material are not intended to represent hazards that may be present under actual fire conditions.


    Available sizes

    Thickness (in.) R-Value Board Size (ft.) Edge Treatment
    Thermax™ (ci) Exterior Foam Insulation 0.625 4.1 4 x 8, 4 x 12 Square Edge
    1.0 6.5 4 x 8, 4 x 12 Square Edge
    1.55 10.1 4 x 8, 4 x 12 Shiplap
    2.0 13.0 4 x 8, 4 x 12 Shiplap

    Technical resources


    How-to videos


    Complete the system


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