... fireproof and waterproof 2. Light weight, heat insulation 3. Installation is easy Rockwool wall sandwich panel: ... sheet,(2) the inner layer is rock wool sandwich,(3) the bottom layer is ... heat insulation, fireproof and waterproof, benvironmental Usage: various roofs and walls referring to the large size factory buildings, storages, exhibition halls, gymnasiums ,etc Insulation rock wool sandwich panel ...