Hi everyone - new to the forums and in need of help. We live in a ranch style bongalow with the main bathroom on the main floor. I noticed a considerable amount of water in basement laundry room which is directly under the main bathroom. I ran a bath and let it drain and there was no leak. I then ran the shower and was met with a steady stream of water coming down into the basement. The tub itself has a diverter on the main spout and a single turn knob for the hot and cold (in case that makes a difference). Also, we have noticed lately that there's water coming from out of the turn knob but wasn't sure what the cause of this would be and not sure whether the new leak and that existing issue would be related now. I have zero experience with plumbing and any help in directing my efforts would be greatly appreciated. Thanks so much in advance.

I am wanting to add a second bathroom to my home on the second floor. It was rough plumbed by the home builder many years ago and never finished. It is directly above the main bath and the kitchen. As you can see, there are water lines and the vent pipe for the first floor. If needed, the dimensions of the room are 10' x 6'. The ceiling height is 88", the roof slope begins 28" from the open wall and drops down to 67". I am hoping to not have to tear the floor up to do this project. I have a rear drain toilet and raised platform shower in mind, assuming the ceiling will accommodate this. My questions are: Would there be any issue tying into this vent pipe to use as the drain? Is my plan feasible/realistic? Any helpful information/advice would be wonderful. Thanks!