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Membrane with a vapour-pressure and tension dispersion system, composed of elastomer modified bitumen with fire retardant additives and a composite polyester reinforcement. Used as a single layer waterproofing system on surfaces where fire retardant properties and partial adhesion are required. The upper surface is finished with slates and the overlap is protected by a thermofusible film. The lower surface is provided with thermofusible bitumen stripes alternated with non-stick stripes 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.