plethodon
New Member
Hello - I have what appears to be an unvented bath trap. Pic shows the current set up and what I'd like to do about it. Depicted plumbing is in my cellar. The bath drains into a 4" horizontal pipe downstream from a vertical 4" stack that goes throught the roof (single storey bldg) via a 2X6 stud wall. The horizontal runs directly below the wall. The horizontal is properly sloped and is 17" below the floor at the vent. The plan is to install a 16" trap arm (2" pipe) via a tee into the vent stack. My understanding is that I will the have to replace the tee connection between the horizontal and vent stack with a wye. A 4" vertical toilet pipe currently drains into the horizontal pipe via a tee 14" upstream from the vent stack and I plan on changing its tee into a wye as well. Does my plan allow proper venting of the bath drain and toilet? Thank you.