Bathroom Remodel – Slow water drip from main vent exhaust stack?

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Good morning DIY folks. I just completed a bathroom remodel — and before I begin, let me just say that … I’m no expert.Here is the plumbing for my vent stack to allow the drains to exhaust properly. All I’ve done, essentially, is move the former exhaust that ran up a wet wall into the attic and put it into the wall, attaching it to the exposed 3″ pipe. Incidentally; this pipe was probably more solid than the house itself, exactly zero movement to it, which made putting the new Y in place nearly impossible.Although I cemented the Y in place, I wrapped the new seams in a bit of duct tape after the fact to ensure it was sealed all the way around. Figuring, of course, that it’s just off gasses, it shouldn’t be a problem if the joins were not perfect.The problem I’m encountering is, of course, a very slow leak. A small drip of water coming from inside that now completed and finished wall.I’ve snuck up into my attic, crawled through some blown in insulation and felt the pipe between the ceiling and the roof and feel no water. It’s also worth mentioning that during the remodel, we had a steel roof put on. So if I, somehow, broke a seal in the roof which was causing some snow to melt and come down the pipe, I’d like to think it would have been corrected by the new roof going on.What I cannot fathom is where this water is coming from. I know that I’ll have to cut a hole in the wall to find/fix it — but I’m hoping that someone here in this community can save me some time and effort and reduce the amount of holes I’ll have to cut. There shouldn’t be any water in this pipe to begin with, aside from some possibly humidity pooling — so I’m at a loss on where to begin.No — I do not have one of those diagnostic snake cameras which would also make my life easier…. via /r/DIY https://ift.tt/3nWsr0U

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