Polyisocyanurate (polyiso) exterior wall insulation is a high-performing closed-cell, rigid foam continuous insulation that is bonded to various organic and inorganic facers on both sides. Polyiso accounts for over 75 percent of the insulation used in new and retrofit residential and commercial construction in the U.S.
While an emphasis on the quality of roofing is important, an equally important facet is often overlooked—the application of insulation below the roof deck
