Shed chimney/ "flue" leaking (pics)

Discussion in 'HVAC Heating & Cooling' started by jeremytl, May 22, 2008.

  1. jeremytl

    jeremytl Scientist

    Jan 17, 2007
    durham, nc
    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.

    Attached Files:

  2. Bill Arden

    Bill Arden Computer Programmer

    Sep 30, 2006
    computer programmer
    MN, USA
    The acids and moisture have "used up" the galvanizing coating.

    I would paint the top with "stove paint"

    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: May 23, 2008
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    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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