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Thread: Shed chimney/ "flue" leaking (pics)

  1. #1
    Scientist jeremytl's Avatar
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    Jan 2007
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    Default Shed chimney/ "flue" leaking (pics)

    Greetings friends: I hope this isn't too off topic for this forum. Here's whats going on: I have a potbelly stove in my shed with a 6" standard flue pipe going up through the ceiling. When it enters the attic of the shed, it is double-walled from there on through the roof. (See pics attached
    It has been leaking for a few months now so I went into the attic to take a look and I could see daylight in a few pinhole-sized areas around the OUTSIDE perimeter of the double wall. So, are there any options to patch it with some kind of heat tolerant caulk or do I need to tear up the flashing and redo the whole set-up? The shingles are fairly old and if I can avoid opening a can of worms, thats ideal. Thanks in advance.
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  2. #2
    Computer Programmer Bill Arden's Avatar
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    Sep 2006
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    MN, USA
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    Default

    The acids and moisture have "used up" the galvanizing coating.

    I would paint the top with "stove paint"

    Edit:
    I would also cut the shingles back about 1/2 inch on the top side so that the shingles are not in contact with the pipe.

    Then paint...
    Last edited by Bill Arden; 05-23-2008 at 08:39 PM.
    Important note Ė I donít know man made laws, just laws of physics
    Disclaimer: I'm a big fan of Darwin awards.

  3. #3
    Moderator & Master Plumber hj's Avatar
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    Aug 2004
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    Default vent/flue

    If that is conventional class B double wall it is not for use with a wood burning stove in the first place. In fact you should have triple wall pipe with the air spaces between the layers.

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