Water leaks from a pipe with sink?

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Mav

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Whenever one of the sink upstairs is being used, can see water dripping from this area. Does not happen with a toilet or shower.

Any idea what could it be? Thanks for the help.

 

Jeff H Young

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water is leaking above so we know that much and its in the lav drainage some how it very well could be accesable from under the cabinet If it has metal piping above, there is a chance it could be at the wall where trap arm p trap connection is so a good look under there . might have to get exploratory with holes maybe a inexpensive camera DIY can save a lot but this can be beyond your level basicly follow the pipes though aint that complex but I dont want to push you to start bashing holes.
it could be the joint we see too, is that black plastic connected to pvc?
 
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Mav

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@Jeff H Young, thank you for your valuable input - it has PVC piping under the faucet and drain pipe is going through a hole in cabinet into the floor.

Tightened up the connection just now, felt it was quite loose and will monitor now. Otherwise will loosen up all connections under the cabinet and inspect them. Thank you.
 

Mav

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water is leaking above so we know that much and its in the lav drainage some how it very well could be accesable from under the cabinet If it has metal piping above, there is a chance it could be at the wall where trap arm p trap connection is so a good look under there . might have to get exploratory with holes maybe a inexpensive camera DIY can save a lot but this can be beyond your level basicly follow the pipes though aint that complex but I dont want to push you to start bashing holes.
it could be the joint we see too, is that black plastic connected to pvc?
Everything under the sink and inside the cabinet is PVC, can't tell what it is going into inside the floor.

Do I need to add any pipe dope or a teflon tape for the connection that is going into the floor? Thank you.
 

Reach4

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Is that a pipe at the very top of your photo?

You could tape/tie some toilet paper or paper towel around higher suspect areas. If that does not get wet, then the cause is below your paper.
 

Jeff H Young

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assumed when he ran water it was leaking at the lower level and dry above ? but yea toilet paper is a good tattle tale on leaks
 
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