THERMAX™ White Finish Insulation

A glass-fiber reinforced polyisocyanurate foam insulation laminated between 1.25 mil embossed white thermoset-coated aluminum on one side and 1 mil smooth aluminum on the other.

Used In

  • Insulation/interior finish system for interior masonry or concrete walls, plus walls and ceilings in metal, wood post frame, and concrete or masonry buildings
  • Commercial, residential and agricultural buildings

Product Advantages

  • Can be installed exposed to the interior without a thermal barrier
  • Can be pressure-washed up to 1,000 psi with a 15-degree or greater spray tip (at minimum 3' distance)

Typical Physical Properties

These properties are typical but do not constitute specifications.

THERMAX™ White Finish Insulation - U.S. Residential

Nominal Board Thickness(1), in R-Value(2)(3) Board Size, ft Edge Treatment Min Compressive Strength(4), psi
.50 3.3 4' x 8' / 4' x 9' / 4' x 10' Square Edge 25
.75 5.0 4' x 8' / 4' x 9' / 4' x 10' Square Edge 25
1.0 6.5 4' x 8' / 4' x 9' / 4' x 10' Square Edge 25
1.50 9.8 4' x 8' / 4' x 9' / 4' x 10' Square Edge 25
2.0 13.0 4' x 8' / 4' x 9' / 4' x 10' Square Edge 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 at yield, whichever occurs first.

THERMAX™ White Finish Insulation - U.S. Commercial

Nominal Board Thickness(1), in R-Value(2) Board Size, ft Edge Treatment Min Compressive Strength(3), psi
.50 3.3 4' x 8' / 4' x 10' Square Edge 25
.75 5.0 4' x 8' / 4' x 10' Square Edge 25
1.0 6.5 4' x 8' / 4' x 10' Square Edge 25
1.25 8.0 4' x 8' / 4' x 10' Square Edge 25
1.50 9.8 4' x 8' / 4' x 10' Square Edge / Shiplap 25
1.55 10.0 4' x 8' / 4' x 10' Square Edge / Shiplap 25
1.75 11.4 4' x 8' / 4' x 10' Square Edge / Shiplap 25
2.0 13.0 4' x 8' / 4' x 10' Square Edge / 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) 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.

THERMAX™ White Finish Insulation - U.S. Agricultural

Nominal Board Thickness(1), in R-Value(2) Board Size, ft Edge Treatment Min Compressive Strength(3), psi
.50 3.3 4' x 8' / 4' x 9' / 4' x 10' Square Edge 25
1.0 6.5 4' x 8' / 4' x 9' / 4' x 10' Square Edge 25
1.55 10.0 4' x 8' / 4' x 9' / 4' x 10' Square Edge / Shiplap 25
2.0 13.0 4' x 8' / 4' x 9' / 4' x 10' Square Edge / 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) Vertical compressive strength is measured at 10% deformation or at yield, whichever occurs first.

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