... cost, water proofing, heat insulation 3.cycling use, wall and roof Sandwich panels:Steel Thickness0.35~0.8 mmPanel thickness50/75 ... /100/125/150 mmEffective width(1) 950mm ---for roof before is (2) 1150mm---for wallLengthAccording to customer's ... 20 yearsCharacterLight in weight, heat insulation, fireproof and waterproof,environmentalUsevarious roofs and walls referring to the large size factory ...