Henry^® Blueskin^® RF200TM is a self-adhered rubberized waterproof roofing membrane underlayment ideal for use on sloped roof surfaces as secondary seal under tile and metal. It's an SBS-modified bitumen roofing membrane underlayment reinforced with a superior skid-resistant polyolefin surface film to protect the building’s interior from damages caused by water infiltration as a result of ice dams or wind-driven rain.