Products / WeatherBond XP HD Polyiso

A 1/2 inch high-density polyisocyanurate cover board bonded on each side to glass-reinforced felt, for mechanically attached and induction-welded single- ply systems only, in 4 by 4 and 4 by 8 foot panels. The bulletin lists an R-value of 2.5 and maximum compressive strength of 109 psi, ASTM C1289 Type II, Class 5, Grade 1, and UL 790, 263 and 1256 as a component of Class A roof systems.