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

As a key component of the THERMAX™ Wall System, the lightweight polyisocyanurate foam insulation provides continuous insulation, a drainage plane and water-resistive barrier, eliminating the need for a membrane or building wrap.

Used In

  • Exterior steel stud walls in commercial applications

Product Advantages

  • Provides continuous insulation on exterior wall
  • Long-term thermal performance
  • R-value of 6.5 at 1"
  • Eliminates the extra step of installing a membrane or building wrap

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.

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