THERMAX™ (ci) Exterior Insulation (U.S. Commercial Only)

Our 1.25 mil foil facer offers mid-range durability for an insulation that continues to outperform offering builders more flexibility to choose the right facer option for the project needs.

Used In

  • Commercial steel stud construction
  • Hospitals, education centers, public buildings, and other commercial applications
  • Exterior, continuous insulation

Product Advantages

  • One of the highest R-values available (R-6.5 at 1")
  • Features a distinct free-rise technology for better product consistency, durability and fire performance over generic polyisocyanurate insulations
  • Contains UV-stable technology and can remain uncovered up to six months
  • It reduces the potential for condensation within the wall assembly resulting in long lasting performance due to its low perm rating and high insulating value

Typical Physical Properties

These properties are typical but do not constitute specifications.

THERMAX™ ci Exterior Insulation

Nominal Board Thickness(1), in R-Value(2)(3) Board Size, ft Edge Treatment Min Compressive Strength(4), psi
.625 4.1 4' x 8' / 4' x 12' Square Edge 25
1.0 6.5 4' x 8' / 4' x 12' Square Edge 25
1.55 10.1 4' x 8' / 4' x 12' Shiplap 25
2.0 13.0 4' x 8' / 4' x 12' Shiplap 25

(1) Not all product sizes are available in all regions.

(2) R means resistance to heat flow. The higher the R-value, the greater the insulating power. R-values are expressed in ft2• h•°F/Btu. R-value determined by ASTM C518.

(3) Consult your Dow Seller or Technical Service Group for information on different R-values.

(4) Vertical compressive strength is measured at 10% deformation or yield, whichever occurs first. Since Dow polyisocyanurate insulation is a visco-elastic material, adequate design safety factors should be used to prevent long-term creep. For static loads, 3:1 is suggested. For dynamic loads, 5:1 is suggested.

Have a question?