PVC stands for polyvinyl chloride which is a thermoplastic membrane and was first installed in Europe in the 1960s and first installed in the USA in the 1970s. PVC roofing system is highly flexible, weather resistant, and is an energy saver with its reflectivity. The seams are heat welded for great reliability and a watertight seal. It is an energy saver with its reflectivity. PVC is available in many different colors and can be installed fully adhered or mechanically attached.