Century City, CA ~ Coal Tar Pitch Roof Restoration

Roofing Problem: Management was seeking an economical yet durable cure for the thirty year old aggregate (slag) surfaced coal tar pitch roof. Typically coal tar is incompatible with other roofing materials. Removal and replacement of the existing roof and insulation adds significant cost to the project.

Roofing Answer: We specified and provided project management for the installation of a cold process polyester and fiberglass reinforced system. The “unblown” (not oxidized) bentonite clay stabilized asphalt emulsion while water tight, allows residual coal tar outgassing and moisture vapor to permeate without blistering or delaminating. After thoroughly vacuuming and cleaning the existing surface, a chopped fiberglass leveling base coat was applied, followed by two additional layers of polyester reinforced asphalt and reflective surfacing. This roof resulted in substantial savings during application and has performed well for a number of years.

For additional information see: Cool Roofs