Products / FTR-Value Polyiso Insulation

FTR-Value is a polyisocyanurate roof insulation board with a closed-cell foam core laminated to fiber-reinforced or fiberglass facers, made to ASTM C1289 Type II, Class 1, Grade 2 (20 psi), with a 25 psi Grade 3 option. It comes in 4 by 4 foot and 4 by 8 foot boards from 1.0 to 4.0 inches thick for single, multi-layer and tapered installations, with a long-term thermal resistance of about 6.0 per inch (LTTR R-5.7 at 1 inch to R-23.6 at 4 inches). The data sheet states UL and FM Global classify it as a component of FiberTite roofing systems as Class A (UL 790) and Class 1A (FM 4470), and cites ICC-ES report ESR-1456.