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Chimney only leaks when hot

Post in 'The Hearth Room - Wood Stoves and Fireplaces' started by dys2pm, Dec 29, 2012.

  1. dys2pm

    dys2pm New Member

    Joined:
    Dec 29, 2012
    Messages:
    1
    I have a wood furnace in the basement. Water leaks threw the thimble when it is hot, not into the furnace, but at the thimble down the wall. The pipe connects into the wall under the garage slab and the cement block chimney is in the garage. There is no clean out door, just a bunch of rubble under the thimble. The wood is well seasoned oak. There is no surface water puddles outside the garage when it does rain, which has been redirected well away from the house for 3 years. The furnace has been used for about 8 years, and and started leaking last spring. I would estimate about 1 gallon of water in 12 hours. No plumbing near the garage either. Any thoughts? P.S. love these forums :)

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  2. chimneylinerjames

    chimneylinerjames Feeling the Heat

    Joined:
    Nov 26, 2012
    Messages:
    381
    Its most likely creosote. Creosote is a liquid when hot, thats why it is important to have your the male ends of the stove pipe pointing down, towards the stove. So the creosote doesn't leak out.

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