Chimney leaking repaired with a rubber membrane. The most prevalent problems are flat roof leaks on Brownstone dwellings in Brooklyn are the Chimney and walls. So often we see that someone tried to repair the transition from roof to the wall with tar.
That is the worst type of repair. Tar is not to seal walls or chimneys. If there is a leak that comes from these areas then the best is to cover it with a membrane. Very little tar should be used.
http://commercialroofusa.com
Waterproofing and Leak Specialists