A 4 mm thick, torch applied polyester reinforced modified bitumen roof membrane which is quickly and easily installed to both old and new roof surfaces. It's thicker, tougher and stronger than most other single-ply materials. Requires no adhesives. Heat welding insures water tight seams that don't com apart. Contains ZHD-7, SWEPCO's highly effective oxidation inhibitor which adds longer life by combating deterioration from infrared and ultraviolet radiation. One of SWEPCO's liquid coatings is used as a final protective coating over Uni+Shield®.