I have a drip in my downstairs wall whenever the upstairs bath room shower, sink or toilet is used. So, I'm assuming the common pipe is where the drip originates from.
I'd like to avoid tearing into the wall or sub floor. Is there a liquid I could pour down the drain that may stop the drip?
The first thing I might try is having it snaked out (and don't forget the vent stack, could be something plugging it up). If you're lucky, that will prevent the level from rising high enough to reach the leaky bit. Probably won't, but may be worth a try (worse case scenario, the snake perforates a bad pipe or otherwise makes the situation acute).
If it were me, I'd call around and try to find a plumber with a flexible scope thing (either fiber optic or a micro-camera) who could get a look at the pipes without make more than dime-sized holes until the problem is located. Then, if you've lived a good, clean life, it might only take a small opening to apply a fix. (This might even suggest that it could be fixed by some pourable goop.)
Guess you're another one of those few people who know everything from birth, and so never have to ask a question? I admit to being envious, it sure must be convenient.
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