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A waterproof roof tile underlay. Used for pitched roof applications. Gives major benefits over traditional bitumen felt. High water vapour permeability due to which the membrane absorbs moisture and directs it outside through the ventilation gap.. Completely watertight, protects the thermal insulation from the outside against rain or snow.. It has UV stabilizers, slowing down the aging process, caused by weather conditions.. Equipped with special anti-reflective coating preventing the occurrence of light reflections.