Products / CertainTeed FlintBoard ISO

Closed-cell polyisocyanurate roof insulation board with fiber-reinforced felt facers for low-slope roof systems. Panels are 4 ft x 4 ft and 4 ft x 8 ft in thicknesses from 1 in to 4.5 in, at 20 psi standard or 25 psi; CertainTeed also publishes a tapered version, FlintBoard ISO T. CertainTeed lists it as meeting ASTM C1289 Type II, Class 1, Grade 2 (20 psi) or Grade 3 (25 psi).