PVC roofing sheet has become a very widely used roofing materials nowadays. It is widely applied in poultry, warehouse, plant, factory, workshop, carport, shed, mobile house and so on. PVC roofing sheet can make up the disadvantages of metal roof sheet because of its great functions. PVC roof sheet is light weight, anti corrosion, anti rusty, fire proof, water proof, heat and sound insulation. In heavy corrosive enviroment, like ceramic warehouse, brick factory, chemical workshop, coastal area, if we apply metal roof sheet, we have to change the roof very frequently. But PVC roof sheet are very endurable to corrison, it can stay in good condition in such a corrosive environment.