THERMAXâ„¢ Heavy Duty Plus Insulation has a glass-fiber-reinforced polyisocyanurate foam core faced with nominal 16.5 mil embossed white acrylic-coated aluminum sheet laminated to plain 1 mil aluminum on one side and 1 mil plain aluminum on the other side. The surface makes it a durable choice for use in high-impact areas.
THERMAXâ„¢ Heavy Duty Plus Insulation can be installed exposed to the interior without a thermal barrier and can be pressure-washed up to 2,000 psi with any spray tip (at 3" minimum distance). It is designed as an insulation and interior finish system for walls in metal, wood post frame and concrete or masonry buildings. THERMAXâ„¢ Heavy Duty Plus Insulation is designed for use in walls only.
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 NER-681. FM 4880 – see Factory Mutual Approval Guide. UL Classified. Calif. Std. Reg. # CA T383.
Related Information
Dow Polyisocyanurate Insulation 15-Year Limited Thermal Warranty (95KB PDF)
Installation Procedures for THERMAXâ„¢ Insulations: Exposed Basement Application (215KB PDF)
Installing THERMAX Sheathing on Interior of Basement Walls
Joint Closure Systems for Enhanced Protection Against Air and Moisture Product/Installation Information (146KB PDF)
THERMAXâ„¢ Heavy Duty Plus Insulation Product Information (140KB PDF)
THERMAXâ„¢ Heavy Duty Plus Insulation has a high-performance foam core faced with 16.5 mil embossed white acrylic-coated aluminum sheet laminated to plain 1 mil aluminum on one side and 1 mil plain aluminum on the other side. The surface makes it an excellent choice for use in high-impact areas.
| 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 | 8.1 | 4' x 8' / 4' x 10' | Square Edge | 25 |
| 1.5 | 9.8 | 4' x 8' / 4' x 10' | Square Edge | 25 |
| 1.55 | 10.1 | 4' x 8' / 4' x 10' | Square Edge | 25 |
| 1.75 | 11.4 | 4' x 8' / 4' x 10' | Square Edge | 25 |
| 2.0 | 13.0 | 4' x 8' / 4' x 10' | Square Edge | 25 |
| 2.25 | 14.2 | 4' x 8' / 4' x 10' | Square Edge | 25 |
| 2.5 | 15.8 | 4' x 8' / 4' x 10' | Square Edge | 25 |
| 2.75 | 17.3 | 4' x 8' / 4' x 10' | Square Edge | 25 |
| 3. | 19.0 | 4' x 8' / 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) 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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03 47 13 – Tilt-up Concrete Insulation
07 20 00 – Board Insulation
07 21 13 – Board Insulation
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