I'm trying to add a sink in my laundry room, one problem I'm having is how to vent the drain as there are water supply pipes (going to the upstairs) in the way preventing me from going straight across to tie into the venting for the washer and floor drain. So I was wondering if I can tee off the existing vent line running horizontally out of the room and send a pipe towards the ceiling to meet the vent pipe from my new sink. I would just build a soffit to cover it. See picture of drawing for better understanding.
Additionally to drain the sink can I tie into the horizontal part of the floor drain vent or do I tie into the 3" main drain line in the house. See picture this is the plumbing under laundry room in crawl space
Thank You for your help
Additionally to drain the sink can I tie into the horizontal part of the floor drain vent or do I tie into the 3" main drain line in the house. See picture this is the plumbing under laundry room in crawl space
Thank You for your help