DuPont™ Thermax™ Heavy Duty Polyisocyanurate Insulation is designed as an insulation and interior finish system for walls and ceilings in metal, wood post frame, and concrete or masonry buildings, as governed by building codes.

Thermax™ Heavy Duty Insulation is designed with a glass-fiber-reinforced polyiso foam core, featuring durable aluminum facings: 4 mil embossed white thermoset-coated aluminum on one side and 1.25 mil embossed aluminum on the other. This tough insulation is ideal for moderate-impact areas and can withstand pressure washing up to 2,000 psi with a 15-degree or greater spray tip at a minimum distance of 3 feet. It meets USDA requirements for incidental food contact materials, making it suitable for surfaces like floors, walls, and ceilings.

Additionally, Thermax™ Heavy Duty Insulation offers high, long-term thermal resistance. Its facers prevent water and vapor intrusion, stabilizing the insulation at a higher R-value. When used with the appropriate joint closure system, its low perm rating helps reduce moisture condensation within and behind the insulation.