Products / CertainTeed FlintBoard ISO HD

High-density closed-cell polyisocyanurate cover board with coated glass facers for low-slope roof systems. Panels are 4 ft x 4 ft and 4 ft x 8 ft, 1/2 in thick, with compressive strength of 80 to 109 psi and an R-value of 2.5. CertainTeed lists it as meeting ASTM C1289 Type II, Class 4, Grade 1, supporting UL Class A rated assemblies, carrying an SH-1 hail rating and scoring 10 on the ASTM D3273 mold resistance test.