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Old 05-14-2014, 09:24 PM   #1
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PVC repair slip fitting leaking on a/c exhaust??, how?


HI,
Saw some dripping from a slip/repair coupling from the atrocious builder. Home is 7 years old and this is the first I noticed this.

This is the exhaust PVC to the outside from the furnace/blower/ac, so how is water getting in the pipe, and enough of it to leak?? Basement is 70 degrees...maybe the air cools enough to condense on the inside of the pipe?? The leak is occurring about where the white box is under the pipe.

Can I fix this with just some pvc cement slathered on the outside??
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Last edited by maxim1; 05-14-2014 at 09:28 PM.
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Old 05-16-2014, 10:47 AM   #2
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PVC repair slip fitting leaking on a/c exhaust??, how?


No one has chimed in....

it is a constant drip....
so either way I assume I must let it dry out (turn off the furnace)

then do I buy a 4" pc of pvc and cut it in half and cement next to the leak-slip/repair coupling, or would a glob of cement work just as well?

I have no experience trying to fix a failed pvc joint.

thanks in advance

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Old 05-16-2014, 12:16 PM   #3
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PVC repair slip fitting leaking on a/c exhaust??, how?


Cut the bad fitting out and replace---the pitch of the pipe might not be right--condensation needs to be able to drain out of the pipe--

I'll move this to HVAC for you--the heating pros understand this piping well--Mike---
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Old 05-16-2014, 03:54 PM   #4
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PVC repair slip fitting leaking on a/c exhaust??, how?


1. Have to cut out and replace.
2. Flue gases on 90 plus furnaces condense and there has to be a means to drain the water.
3. None of the joints look like primer has ever been put on them-here that is an automatic fail.
4. that's an awful long length of pipe-I hope its within the manufacturer's specs.
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Old 05-17-2014, 06:44 PM   #5
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PVC repair slip fitting leaking on a/c exhaust??, how?


well it apparently passed inspection, but i think the inspector and the builder were buddies.
Drain hole? wont exhaust gases come through a drain hole though?

should the pitch run back towards the furnace?
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Old 05-17-2014, 06:55 PM   #6
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PVC repair slip fitting leaking on a/c exhaust??, how?


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well it apparently passed inspection, but i think the inspector and the builder were buddies.
Drain hole? wont exhaust gases come through a drain hole though?

should the pitch run back towards the furnace?
Maxim... I did not see anyone recommend a drain hole.... but yes...you do not want any leak for exhaust gas in that pipe.

Yes... it slopes back to your furnace, where you should have a discharge tube (3/4" probably) directing it to your floor drain (or a little pump unit and tubeing directing it to your floor drain)

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