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Furnace Chimney "bleeds" water thru brick

Posted By: Jon Golli
Monday, 31 January 2000, at 1:42 p.m.

In the wintertime, only when the furnace is on, my chimney brick becomes wet from the inside of the chimney. This occurs from the basement all the way to the chimney cap. In some places the brick is exposed, in others gypsum plaster covers the brick. All plaster touching the brick becomes subsequently ruined from the water, and the exposed brick develops unattractive water spots. This is also slowly erroding the brick away from the inside. I originally thought that it was condensation, but now I'm not sure. It cannot be a leak around the flashing, because the "bleeding" only occurs in the winter when the furnace is on. I don't believe the furnace is a high efficiency model that requires special venting. My house is approx. 100 years old, but the mortar in the chimney is surprisingly intact. Do you have any explanation?

Thank you, Jon

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