THERMAX™ White Finish Insulation has a glass-fiber reinforced polyisocyanurate foam core faced with 1.25 mil embossed white thermoset-coated aluminum on one side and 1 mil smooth aluminum on the other. It can be pressure-washed up to 1,000 psi with a 15-degree or greater spray tip (minimum 3' distance) and can be installed exposed to the interior without a thermal barrier.
THERMAX™ White Finish 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.
For best results, seal joints with tapes or joint closures from Dow.
Building Code Compliance
Complies with ASTM C1289 Type I, Class 2. Meets IBC/IRC requirements for foam plastic insulation. See ICC-ES ESR-1659. FM 4880 – see Factory Mutual Approval Guide. UL Classified. Calif. Std. Reg. # CA T383. Florida Building Code FL 3839.
Related Information
THERMAX™ White Finish Insulation Product Information (78KB PDF)
Dow Polyisocyanurate Insulation 15-Year Limited Thermal Warranty (95KB PDF)
Installation Procedures for THERMAX™ White Finish Insulation (Agricultural Applications) (286KB PDF)
Installation Procedures for THERMAX™ or STYROFOAM™ Brand Rigid Insulation – Closed Crawl Space (414KB PDF)
U.S. Residential
THERMAX™ White Finish Insulation has a white embossed surface that is aesthetically pleasing and can be washed, making it well-suited for interior basement and garage walls and ceilings.
| 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 |
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(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. |
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U.S. Commercial
THERMAX™ White Finish Insulation has a white embossed surface that is aesthetically pleasing and can be pressure-washed, making it well-suited for interior walls and ceilings.
Related Information
Joint Closure Systems for Enhanced Protection Against Air and Moisture Product/Installation Information (146KB PDF)
| 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. |
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07 20 00 – Board Insulation
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U.S. Agricultural
In agricultural buildings, the white embossed surface of THERMAX™ White Finish Insulation helps reduce light expense, enhances the work and growing environment and can be pressure-washed.
| 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. |
||||
07 20 00 – Board Insulation
We're here to help. If you're not finding the information you need, please let us know.