... 2. Light weight, heat insulation 3. Installation is easy Rockwool wall sandwich panel:Steel Thickness: 0.35~0 ... sheet,(2) the inner layer is rock wool sandwich,(3) the bottom layer is also steel ... : 15~20 yearsCharacter: Light in weight, heat insulation, fireproof and waterproof, benvironmental Usage: various roofs ... storages, exhibition halls, gymnasiums ,etc Insulation rock wool sandwich panel