So I'm working on a bathroom that was finished to about 90% by the original contractor. I'm trying to finish things up but want to make sure I do things correctly.
I always assumed the vent was connected, as I said they did 90% of the work, but as I was flushing the supply lines, I dumped the bucket of water into the tub and it would not drain. I figured it may have a little bit of debris because this bathroom has been sitting unfinished for almost eighteen years, but I began to think the vent wasn't connected and sure enough it wasn't.
So I've posted a video, and I'll offer an explanation as to what you are seeing:
The first thing is the drain line for the sink. The second is the drain line for the tub which has a p-trap. The third thing is the drain for the toilet, this main part is where the tub drain connects, and it also branches out on the other end, I always assumed it was for a cleanout, but apparently it was for the vent. You can also see the unfinished connection between the toilet/tub connection, and the sink. Lastly the video goes sideways and you can see the unfinished vent. The vent does tee off and connect to the sink above the ceiling.
I just want to make sure I connect it correctly, I have a feeling it wouldn't be right to just bring it down the the concrete, elbow it and connect it to the line where the toilet is, but then again that might be the right way. If that is the right way would I put a cleanout instead of an elbow?
I figured it was wrong because the toilet or tub could back up into the vent, but at the same time those drains need air behind them to work properly.
I also did a paint mock up if that helps: