Decking systems are made with high-strength galvanized steels and with the Galvalange and Sendzimir procedures. Subsequent phosphating step, first base and painted with polyester finish silicone or polyvinyl fluorene (PVDF). The isolates used are always free of CFC. The insulation will depend on the option you choose. All systems are based on panels or plates of 1 meter in width which overlap lengthwise. They are connected together by means of steel screws with sealing washers with EPDM tip without mastic or silicone sealants that may change over time. (In systems that must be exposed screw head screws are used nonmetallic).