Products / WeatherBond XFP HD Polyiso

A 1/2 inch high-density polyisocyanurate cover board laminated to coated glass-fiber-mat facers with ReadyFlash dark and light faces, for use over a variety of substrates in new and re-roofing work, in 4 by 4 and 4 by 8 foot panels weighing about 11 lbs per 4 by 8 board. The bulletin lists an R-value of 2.5, an FM severe hail rating, ASTM C1289 Type II, Class 4, Grade 1 (109 psi max) and FM 4450/4470 Class 1 approval for steel roof-deck constructions.