OKAPUR FLEX is a one component liquid applied roof waterproofing based on pure polyurethane, consists of a polyurethane resin, mono-component, elastomeric, without reinforcing mesh (only in singular point: evacuations, upstands, …) internal layer; which once polymerised conforms an elastic lining, in form of a layer completely bonded to the support (concrete, mortar, ceramic, metal, polyurethane foam (PU) and other waterproofing membranes like PVC, EPDM and bituminous). The minimum layer thickness of the assembled membrane is 1.2 mm.