Koppers KOP-R Roof Insulation - Isocyanurate Koppers KOP-R Roof Insulation features a closed-cell polyiso core integrally laminated to fiber-reinforced felt facers. KOP-R Roof Insulation is specifically recommended for hot asphalt or coal tar BUR, modified bitumen and single-ply membrane systems. KOP-R Roof Insulation is also available in a 25-psi formula. To learn more about Koppers KOP-R Roof Insulation - Isocyanurate, select from the following: Benefits of KOP-R Roof Insulation Applications and Uses Table 1: KOP-R Roof Insulation Table 2: Typical Physical Properties  Return to Roof Insulation