Durapax Coal Tar Roofing and Waterproofing Pitches are derived from base tars extracted from bituminous coal during the coking process. A variety of feedstocks are then blended and distilled to achieve the proper specification, physical properties and performance characteristics. The thermal treatment during the coking and distillation process produces a material with a unique chemistry. This chemistry yields properties that are ideal for applications in built-up roofing and waterproofing systems. Roofing bitumens made with a coal tar base are the premium products of choice. Coal tar's tight aromatic molecular structure produces inherent characteristics which provide coal tar pitch with a natural resistance to the severe effects of temperature, moisture, ponding water, and corrosive elements found in many environments.