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Membrane composed of elastomer modified bitumen and a composite polyester reinforcement. Used as a base layer within a multi layer waterproofing system or as a vapour control layer. The upper surface is finished with talcum/sand. The lower surface is protected by 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.