Polymeric bitumen rolls are recommended for flat roofs. New generation make not from oxydet as earlier, and of polymeric bitumen. This material elastic and strong. The ego cover using a gas torch. The main appeal of this material consists in an ego of profitability. Lacks: there can be problems if ventilation and water-drains is not correctly built. Service life depends on several factors - quality of a covering, quality of installation works and configurations of a roof. At a correct laying the material can serve 20 years