TPO is thermoplastic polyolefin that can be used in a variety of applications. On flat or low-sloping roofs, a TPO roof system is made up of a single-ply roofing membrane supported by a properly built solid base – sometimes an engineered insulation system. Ranging from 40 mils to 80 mils and beyond. TPO roof membranes are available in a variety of thicknesses. And the quality of the products varies greatly from one producer to the next. To construct watertight seams and seals around roof edges and penetrations, the membrane is bonded to the roof by adhesives, mechanical fasteners, and other heat welding procedures. TPO roofing systems create an excellent barrier that repels snow, water, and ice, as is the goal with most roofing systems. To keep your contents and structure safe and dry.