... cost, water proofing, heat insulation 3.cycling use, wall light wall Sandwich panels:Steel Thickness0.35~0.8 mmPanel thickness50/75/100 ... steel sheet,(2)the inner layer is rock wool sandwich,(3)the bottom layer is also steel sheetRockwool ... ,environmentalUsevarious roofs and walls referring to the large size factory buildings,storages, exhibition halls, gymnasiums ,etcPackingPacked by shipping ...