We are offering roof heat insulation material. aeroalm premium wf ( double bubble insulation ) consist two layers of fire retardant air bubble film both side laminated with woven fabric laminated aluminium foil. roll size (w x l) 1.2m x 40m bubble size 4mm x 10 mm total thickness (mm) 8 mm reflection ratio 97% thermal resistance emissivity 0.03-0.04 temperature range -122 ℉ to 230 ℉(-50°c ~ 110 °c)