... 2.Light weight, heat insulation 3.high quality,reasonable price light sanwich roofing panel:Steel Thickness0.2~0 ... steel of panelslifetime15~20 yearsCharacterLight in weight, heat insulation, fireproof and waterproof,environmentalUsevarious roofs and walls ... gymnasiums,freezing stores and purification workshops (tempkeeping,heat insulation,weight bearing,weatherproof,rich color and good appearance4 ...