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Membrane composed of elastomer modified bitumen and a non woven polyester reinforcement. Used as an upper layer under ballast within a single or multi layer waterproofing system or as a base layer within a multi layer waterproofing system. The upper surface is finished with talcum/sand. The lower surface is protected by a thermofusible film. Energy consumption and used ancillary materials during installation are considered and are based on the average installation scenario of the product. The installation phase includes 10% overlapping material. The membrane has a reference service life of 70 YEARS, if combined with Soprema top layer.