When it comes to selecting the best overall insulation product for roof systems, polyiso (polyisocyanurate) is the product of choice. No other foam plastic insulation has the perfect combination of features so important for long-term performance. These performance features provide excellent initial installation costs, as well as attractive life cycle payback rates, which can be easily calculated by using the EnergyWise Roofing Calculator, created by the NRCA and PIMA.
Polyiso is one of the Nation’s most widely used and cost-effective insulation products and has been cited by the U.S. Environmental Protection Agency for its responsible impact on the environment. Polyiso is a closed-cell, rigid foam board insulation used primarily on the roofs of offices, health facilities, warehouses, retail and industrial manufacturing facilities and educational institutions. Because of its high thermal performance in the home building market, it is product of choice for energy-aware homebuilders and consumers.
Polyiso insulation is the only foam plastic insulation that can be used in almost all types of roof systems without the need for a thermal barrier. Polyiso’s high-temperature stability prevents melting when mopped with hot bitumen. Polyiso is unaffected by properly applied construction adhesives, and many membrane manufacturers specify its use without the need for a cover board in single-ply adhered systems.
Polyiso's many attributes include: