Coal Tar Pitch Roofing
1. General: For an informative, in-depth general article about various roof systems, see this page at the Whole Building Design Guide site, which is maintained by the National Institute of Building Sciences.
4. Technical: See this Coal Tar Membrane System Specification, as well as Coal Tar Application and Design Considerations for insight into how a coal tar pitch roof system is put together. Both documents are made available by Durapax.