"I plan on sealing the exterior side of the wall this summer to see if that will help ameliorate the problem." I would recommend Thompson's Water Seal for masonry on the inside. You can apply it with a cheap tank sprayer but you may need to pressure wash it first if it has scummed up. _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net>