Products / GenFlex HD ISO High-Density Polyiso Insulation

GenFlex HD ISO is a half-inch (13 mm) high-density polyiso cover board with a closed-cell foam core and a coated glass facer on both sides. It is made in Grade 1 (80 psi minimum per ASTM C1289) and Grade 2 (110 psi minimum), in 4 ft x 4 ft and 4 ft x 8 ft boards. The data sheet lists ASTM C1289 Type II Class 4 and code approvals FM 4470, UL 790 and UL Classified. It is used under fully adhered or mechanically attached single-ply and cold-applied modified bitumen systems, and is not to be attached or surfaced with hot asphalt.