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Old 12-24-2016, 06:56 PM   #1
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Hidden leak and pressure


One bathroom cabinet has noticeable water damage. The side bulges out, the toeplate bulges and inside the particle board and has evidence of water damage.

Today found small puddle of water inside cabinet. I sat with flashlight under the sink. Ran cold water. Ran hot water. Felt around both shutoff valves. Felt where popup lever is. Felt drain at sink and u-pipe. There was not one drop of water.

I went to adjoining room behind wall an no sign of water.

Where could this leak be?
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Old 12-24-2016, 07:40 PM   #2
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Re: Hidden leak and pressure


Sometimes the faucet itself leaks. Try looking underneath the sink under the faucet really good with a flashlight.
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Old 12-24-2016, 07:40 PM   #3
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Re: Hidden leak and pressure


If there was a puddle under the sink, it is obviously from the plumbing there.
It could be a drain that only leaks when the plunger is down, or it could be splash back leaking down from under the faucet, or it could only be leaking when static pressure builds up.

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Old 12-24-2016, 07:45 PM   #4
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Re: Hidden leak and pressure


Part II. Pressure

My faucets have ordinary ho hum water flow. Nothing remarkable, but satisfactory.

My daughters new house has definately more forceful water flow from all faucets. Would that be due to larger plumbing pipes, or are water pipes standard? We live 1 mile apart.
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Old 12-24-2016, 08:00 PM   #5
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Re: Hidden leak and pressure


Tomorrow when we're back over there painting I'll check more thoroughly near the faucets. House an faucets are 25 yo. The plunger hasn't been used but I'll check it out.

Thank you.

Static pressure? Not familar with that term. But this sink is near the water tank and a utility sink that was used most of the day.
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Old 12-24-2016, 08:07 PM   #6
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Re: Hidden leak and pressure


Quote:
But this sink is near the water tank
If you are referring to your house, that implies that you are on a well.
If you are referring to your daughter's it implies that your daughter is on a well.

Well, that is unless you are referring to the water heater tank.
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Old 12-24-2016, 09:18 PM   #7
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Re: Hidden leak and pressure


Be sure to plug the drain and fill up the sink, all the way to the overflow. Check for leaks around the drain assembly. Also check for leaking around the faucets when water gets splashed up around them.

Pressure could be something as simple as a water saving or partially clogged aerator. If it's an older home, do you have galvanized plumbing? It can corrode internally and cause very poor flow and pressure.
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Old 12-24-2016, 09:38 PM   #8
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Re: Hidden leak and pressure


Could be water on the counter leaking around the basin rim.

You could try laying some newspaper in there. You will see the spots where it dripped even after it dries.
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Old 12-24-2016, 10:57 PM   #9
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Re: Hidden leak and pressure


Quote:
Originally Posted by Startingover View Post
Tomorrow when we're back over there painting I'll check more thoroughly near the faucets. House an faucets are 25 yo. The plunger hasn't been used but I'll check it out.

Thank you.

Static pressure? Not familar with that term. But this sink is near the water tank and a utility sink that was used most of the day.
Static pressure is simply the pressure in the pipe when all fixtures are shut off and no water is flowing anywhere in the home. The static pressure (usually anywhere between 40 and 75 psi on municipal supply) is equal throughout the home when no water is flowing.

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Old 12-26-2016, 06:48 AM   #10
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Re: Hidden leak and pressure


Test the drain connection at the sink by filling up the sink bowl with water that has food coloring added to it. See if any water is leaking from the connection.

If that doesn't work, use flour to coat the bottom of the vanity to see where the leak is coming from.
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Old 12-26-2016, 07:06 AM   #11
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Re: Hidden leak and pressure


By 'water tank' I meant water heater. I'm trying to stop using term 'hot water heater'.

Clarenceboddick, great idea to use food color. Will investigate more this week. I do notice the 'water hammer' problem at this sink. Probably not related.

Unrelated to this post: the flooring guys had to pull all 3 toilets. My daughter bought 3 new toilets, AS, for them to install. While I was on the floor removing wallpaper I noticed the shutoff valve handle is smack against the toilet base. Almost like the handle may not be 100% open. Altho theres no way to confirm that. The flooring guys also do bathroom remodel so I guess they should know if the valve is correct or not.

The new toilets are the design with straight sides so no curve underneath to dust. The base must be bigger. I don't know anything but It seems to me the water line coming out if the wall needed to be shorter so the handle doesn't hit the toilet.

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Old 12-26-2016, 09:44 AM   #12
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Re: Hidden leak and pressure


Quote:
I'm trying to stop using term 'hot water heater'.
I agree, we heat cold water we don't heat hot water.
Kind of redundant to say "hot".

But keep in mind that your home can have other types of tanks.

Reminds me of a story my wife tells.

When she was a little girl, apparently she talked too much.
Her father told her,
"You only have so many words in life. If you use them up you
won't be able to talk any more"

Worked for a little while.
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Old 12-26-2016, 10:54 PM   #13
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Re: Hidden leak and pressure


I splashed a bit of water around the faucet and that's where the leak is. I'll try a little caulking.
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Old 12-27-2016, 06:18 AM   #14
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Re: Hidden leak and pressure


Quote:
Originally Posted by Startingover View Post
I splashed a bit of water around the faucet and that's where the leak is. I'll try a little caulking.
I think, the caulking will be good to fix the hidden leak.
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Old 12-27-2016, 06:20 AM   #15
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Re: Hidden leak and pressure


Oh, does that mean the gasket between the faucet and the sink surface is deteriated ?
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