DuPont™ Thermax™ (ci) Exterior Insulation* is a rigid board insulation consisting of a glass-fiber-reinforced polyisocyanurate foam core faced with nominal 1.25 mil embossed BLUE™ thermoset-coated aluminum on one side and 0.9 mil smooth, reflective aluminum on the other. Designed for continuous insulation, Thermax™ (ci)’s foam core is homogenous – featuring finer cell size and better cell orientation, reducing wormholes and knit lines – resulting in one of the highest R-values(2) available (R-6.5 at 1”) for immediate insulation and weather protection on the job site, as well as long-term thermal performance.

Thermax™ (ci)’s integral durable thermoset coated aluminum facer provides a drainage plane and water resistive barrier, eliminating the need for a membrane or building wrap when used in conjunction with DuPont™ Flashing Products. With its low perm rating and high insulating value, Thermax™ (ci) can reduce the potential for condensation within the wall assembly. Thermax is also engineered with unique fiberglass reinforced core for enhanced fire performance making it the only polyisocyanurate insulation to have FM 4880 approval and can be used on walls and ceilings, up to 30 ft.