I live on the top floor of my condo, and the neighbour across the hall from me has been having a gurgling noise in his toilet. The plumbers have been out numerous times, snaking the vent, but it is still not fixed. This only happened a couple days after he had some plumbing work done, so this leads me to believe that this plumbing company is scamming him (or the strata I should say, as all of us in the building are footing the bill for this guy's plumbing issue). I have no problems in my one bathroom that shares the vent stack with his side, but the plumbers insisted on coming into my unit because they thought they could fix it from my side. After filling my tub up numerous times and doing some suction testing...they still did not fix his plumbing problem. If snaking the common vent stack did not work, I have read online that it is most likely a branch off pipe to just his unit that could have the problem, as none of us around him are experiencing any plumbing problems. Now these plumbers are saying they HAVE to cut into my wall to auger the pipe that is between both of our bathrooms! Even though they stated before that it could be accessed from either side of the wall. Isn't a shared vent stack exactly that...SHARED from both sides of the wall. I would never expect my neighbour to have constuction done in their place because I have a plumbing problem on my side. Can you please clarify this shared vent stack thing for me?