SBS modified torch-on elastomeric waterproofing membranes with fiberglass or non-woven spun bond polyester felt; both sides are coated with polyethylene film or one side coated with polyethylene film, the other side is coated with silica sand, aluminum foil or natural or colored slate. The elastomeric compound is carefully produced under controlled conditions to ensure its thermal stability at atmospheric temperatures and flexibility at very low temperatures.