Furnace exhaust pvc pipe leaking water at joint

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eaglemtn

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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.
 

breplum

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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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