General Roof Specification Information Koppers offers to the Architectural-Construction community a complete line of coal tar built-up roofing systems. They are the most durable of roofing systems for dead level and low slope roof decks. There are a series of two coal tar built-up roofing specifications incorporating three different reinforcement felt options. Each of these BUR specifications incorporates long lasting coal tar as the interply and top pour protective pitch. All ASTM Standards referenced in this manual apply at the time of manufacture of the product. The above referenced specifications are described via the following links. Coal Tar IRMA Fabrics Roof Maintenance  Return to Table of Contents