What is isocyanurate insulation?

Polyisocyanurate (Polyiso) is a closed-cell, rigid foam board insulation that is bonded to facers on both sides, which are composed of various organic and inorganic materials. Polyiso is used in roof, wall, ceiling and specialty applications within commercial and residential buildings of all types.Click to see full answer. Likewise, people ask, is Polyiso insulation safe?Polyiso insulation is a thermoset, closed-cell, rigid foam plastic insulation manufactured in board form. Polyisocyanurate insulation can contribute to a more fire-safe home or building after renovation work. It passes both American National Standards Institute/Underwriters Laboratories Inc.Also, what is the R value of polyisocyanurate insulation? (102 mm) thick piece of polyisocyanurate insulation; however, BSC tested a double 2 in. (51 mm) layer so the appropriate LTTR is 2 x 12.1 = R-24.2 (RSI-4.26). If the NRCA recommendation of R-5.6 / in. is assumed, 4 in. of polyisocyanurate will be R-22.4 (RSI-3.95), regardless of how many layers are used. Similarly, you may ask, what is Polyiso insulation used for? Polyiso, or polyisocyanurate, is a rigid foam insulation used in more than 70% of commercial roof construction and offers a continuous insulation solution for commercial flat (low slope) roof insulation and wall assemblies.What is Pirboard?PIR (polyisocyanurate) Boards. Polyisocyanurate (PIR) is one of the most efficient insulation material used in construction. This product is an improvement of previously used PUR boards (polyurethane), typically produced as a foam and used as rigid thermal insulation.