THERMAX™ White Finish Insulation

THERMAX™ White Finish polyisocyanurate insulation is designed as an insulation and interior finish system for interior masonry or concrete walls, plus walls and ceilings in metal, wood post frame, and concrete or masonry buildings, as governed by building codes.

It features a 1.25 mil embossed white acrylic coated aluminum sheet on one side and nominal 1.0 mil aluminum on the other side. The white embossed surface of THERMAX™ White Finish is aesthetically pleasing and easy to clean. It can be pressure-washed up to 1,000 psi with a 15-degree or greater spray tip (at minimum 3' distance).

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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