Hi, plumber withouth knowing, may have caused a small hole on PVC drain behind concrete wall . The drain pipe is for the bathroom lavatory. I would want to avoid damaging the concrete wall again as it already cost a fortune to have the bathroom re-tiled.. am thinking about removing the lavatory and pouring tar slowly into the entrance of the drain on the wall to seal off the small hole.. on second thought, wouldn't tar damage the PVC pipe? If so , are there alternative sealing agents that I can use? Will appreciate...

Hmmm...

Tar is a bad idea, creative, but probably cause issues down the line when part of it tears off and clogs the drain line... ;)

Exactly how did the plumber, "without knowing" cause this hole? Let us know more... OK?

Mark

Hi, thanks for response, it was the mason who must have hit the drain pipe when I had the bathroom water line repaired for a leak.. he had to dig through the concrete wall to reach the water line... the leaky water line was repaired and so I had the destroye portion of the wall re-tiled after.. problem started when I started to use the lavatory as I observed that moisture builds up after on the ceiling below the bathroom.. honestly, we tried to pour small amount of tar but I guess it didn't hit the hole... drain still leaks.. another option am thinking about is to insert a smaller drain tube that will bypass the area where the hole is supposed to be.. I may be able to estimate where it is by inserting a water hose inside and let water pass through the hose up to a point where the leak stops.. hey, I am a banker and this is definitely out of my line of work but I am trying to figure out options that will not entail too much cost and damage... can you suggest other options? Am thinking about doing the tar thing one last time before I do the second option though... again, thanks! :) will appreciate getting your response, I neeeeeeeed your help

Its really quite simple. Whoever cause the damage the pipe is responsible for all cost to repair the pipe correctly. That's the price of doing business. Some one needs to stand up for this and take responsibility to get the pipe fixed correctly. Tar is a no go, as is running a tube as you suggested. The fact is, if this isn't fixed right, you will get sewer gas, as well a water out of the small hole. There really is no quick fix here. Good luck, and I hope someone will stand behind their mistake.

So you have no access to this broken drain line? Behind a concrete wall, is it an exterior wall or what. MGD says it best, he who breaketh must fixeth

The last time I ran into this situation a contractor had sealed a tub dap-out by pouring hot tar in the hole. The tar burned a hole in the PVC and ran down the pipe until it cooled. I had to jackhammer up the slab and replace all the pipe bnack to the tub. There is no easy repair. The affected pipes must be replaced. Good luck, Tom