Furnace exhaust pvc pipe leaking water at joint

Discussion in 'HVAC Heating & Cooling' started by eaglemtn, Apr 8, 2021.

  1. eaglemtn

    eaglemtn New Member

    Joined:
    Feb 4, 2021
    Location:
    Minnesota
    I had the furnace replaced three years ago. This winter I noticed water leaking from one of the pvc pipe joints in the exhaust pipe. I hung a bucket under the pipe to see how much water was leaking. I would guess that in a month's time in a MN winter, probably 2 quarts leaked.

    What would be the best way to seal this joint? The joint is part of several elbows - the pipe changes directions in this section. I would like to just seal up the joint instead of cutting this whole section out and redoing it.

    Would putting silicon caulk around the joint be sufficient? I was going to wait until summer when the furnace isn't working to make sure it's all dry in that joint.
     
  2. fitter30

    fitter30 Well-Known Member

    Joined:
    Feb 2, 2020
    Occupation:
    Retired service tech
    Location:
    Peace valley missouri
    Proper way is to cut a section out and use repair couplings and a short piece of pipe.
     
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  4. breplum

    breplum Member

    Joined:
    Oct 2, 2004
    Occupation:
    Plumbing and heating contractor
    Location:
    San Francisco Bay Area
    The original installers should be willing to fix for no charge since it was definitely poor assembly on their part.
    I don't recommend silicone, though that could work.
    Putty epoxy can work if esp. if you can rough up the area with sandpaper.
    The best product I can personally attest to is DuraCraft All Craft Epoxy. It cures hard, but it has held on some ABS 2" plumbing joints that I have been observing for years (as a working test).
    https://www.amazon.com/DuraCraft-DU...ocphy=9031997&hvtargid=pla-634076901757&psc=1
    But you could try something cheaper as well.

    If you do have to cut out a section, we use 2" (or 3") no-hub couplings (the shielded, code approved type) all the time.
     
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