Waterproofing flat roofs is a sensitive task. Even the slightest lack of care and attention can lead to damage and leaks. Locating such problem areas after work has been completed is not only difficult, but, if the worst comes to the worst, it can also be very costly. REGUPOL resist protects the sealing and insulation against mechanical damage and strongly mitigates thermal, chemical and UV-related effects, thus preventing premature ageing. REGUPOL resist offers clear technical, physical and financial advantages over protective screeds or protective concrete. REGUPOL resist is a protective layer in accordance with DIN 18531ff, which we obtain from the upcycling of 95 percent recycled raw materials and have been doing so for over 65 years. Because we produce in Germany in an environmentally friendly and resource-saving way, we have been awarded the NRW Environmental Economy Prize in 2020 and the NRW Efficiency Prize in 2021.