KÖSTER TPO FR is a hot-air-welding roofing and waterproofing membrane made of thermoplastic polyolefins (FPO/ TPO) based on Polyethylene with centrally embedded glass fleece reinforcement. KÖSTER TPO FR membranes are classified as Broof(t2) and Broof(t3) and are only available in white color with an SRI > 85. The KÖSTER TPO FR membranes and can be applied with different application methods such as mechanical fastening and loose-laid under ballast (e.g. gravel, green roofs).