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Bernie41 12-08-2011 07:33 AM

My vanity sink is "sweating"
Dear friends, I would like to pick your brains and see if you can suggest some solution for this "strange" problem. In my bathroom I have a vanity sink which is sweating. The sink has no cracks and the connections are all in good shape without any visible leak. Nevertheless, if I touch underneath the sink I get my hand wet. All the towels located un a drawer under the sink are humid and I cannot put anything there because of the humidity in such environment. I have tried to locate the cause of the leak and cannot find any dripping. Beside of this and if there is a leak I cannot imagine the water going upwards and moistening the whalo sink. Thanks in advance for your suggestions.

Bud Cline 12-08-2011 09:27 AM

Porcelain sink?
Forced-air heat probably propane?
No ventilation or exhaust fan?
Need to know more.

Bernie41 12-08-2011 11:23 AM

My sink is sweating
Thanks for your answer Bud
Yes you are right, there is no ventilation in the bathroom.
Nevertheless In the morning I dried all the sink carefully and wanted to see what happens. After several hours, (nobody used the bathroom, no vapor from the hot shower or anything else) when I checked in the afternoon it was wet again. :(

Bud Cline 12-08-2011 11:33 AM


Thanks for your answer Bud

Well, those weren't intended to be answers, they were supposed to be questions as noted by my use of the question-marks. Just testing some theories but without answers it is all for naught..

plumbing 12-08-2011 01:13 PM

Hi, the leak may be behind the wall or/and check your "angle stops". Heat rises molecules speed up H2o "water" sticks to the air molecules and the water will rise with the air. angle stops have a compression ring which compresses to the copper stub-out so moisture my be slipping out from ring. So get some channel locks and a crescent wrench and grab the angle stop from the "in side" with channel locks and tighten "big" nut with crescent wrench "just a quick errt"/ "{{{{NOT TOO TIGHT}}}}". also give the small nut one too "connected to line". they are brass so it may have loosed up over time. Also TURN "ON" FAUCET TO RELIEVE PRESSURE while working!

Licensed plumber!

Bud Cline 12-08-2011 01:28 PM

Now there's a leak???

plumbing 12-08-2011 01:48 PM

there is moisture. like if you where boiling water and put a lid over it then pressure will built but up the steam needs a way to escape so it pushes the "(lid)ring in angle stop" to the side, walla steam. But since it's a pressurized water pipe there is always pressure, so water is always trying to escape. The ring is brass on a copper pipe and when you put one on the water is off "i hope:whistling2: " and it does not fit properly until hot water gets past it and again molecules speed up therefore pipe fitting expands then cools down."puts a lot of wear on it " kinda like bending a piece of metal back and forth until it snaps it gets warm from the friction causing the molecules to expand then separate. so ring may have got warm then cold then.etc.. "it gets loose and vapor comes out."

Bud Cline 12-08-2011 01:54 PM

I ain't buyin' none of that in this case.:laughing:

There are billions of those types of connections in this country alone. If that was the case 70% of the connections in the entire country would be leaking on a daily basis.:) No sale!:no:

plumbing 12-08-2011 02:18 PM

I have been a plumber for 26 years i have worked with problems related to this tons of times. Im not saying this is a guarantee fix but it is the first thing i would do. It can also be a connection error with stub-out in the hold rite where "pex/zurn?" fitting is attached "BEHIND DRYWALL" where it is crooked.

Bud Cline 12-08-2011 02:27 PM

Can't argue with you just don't think this is the case this time. I've been married for 35 years but that doesn't make me a good husband.:whistling2:

plumbing 12-08-2011 02:32 PM

sorry, i type like i am angry but you cant really show expressions while typing so please forgive my typing:).

oh'mike 12-08-2011 06:05 PM

One cause of that problem occurs with the cultured marble tops is this---

Sometimes the overflow channel that runs from the little hole in the sink down to the drain will begin to seep-

I've only run into this twice--but it does happen---the casting was thin on one and eventually gave out---the other was a tiny crack hidden by the thin plastic mold that was used to form the sink.

Both sinks were old and began leaking after a number of trouble free years.

plumbing 12-08-2011 06:11 PM

TO: Oh'mike

nobody used the bathroom.

oh'mike 12-08-2011 06:23 PM


Originally Posted by plumbing (Post 789284)
TO: Oh'mike

nobody used the bathroom.

:eek: What are you talking about? OP has a wet sink bottom--

I am trying to find the problem--the water is coming from somewhere--

plumbing 12-08-2011 06:35 PM

I understand but how would water come from overflow when there is no water being ran.

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