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?
Nothing I would trust.
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.)
Do you only have the *sound* of a drip,
or is there actually evidence of dampness in the wall?
If only sound, the pipes may be plastic (PVC/ABS);
these plastics don't absorb much of the dripping noises
and you may have to live with it.
No I don't know everything from birth. But fairly close to it, I remember
distinctly seeing on Sesame Street, Bert & Ernie doing this routine:
"BEFORE you can have a cookie, you have to lift the cover.
AFTER you lift the cover, then you can have a cookie."
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