WDL-T Elastomer（SBS）modified bitumen Waterproofing coil membrane is flaky modified bituminous waterproof sheet of uniform thickness which is made of high-quality styrene – butadiene – styrene (SBS) thermoplastic elastomer modified bitumen as raw materials, high-quality polyester long-fiber base fabric as the enhancement layer, and with the surface course covered with polyethylene film (PE), fine sand (S) and mineral aggregates (M) as isolation materials.