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I have a bathtub that has horrible drainage and its because of an old galvanized horizontal pipe that connects to the stack.

I cannot replace this pipe with PVC with a better slope without compromising the floor joist structure in the ceiling. Home is from early 1900s.

However, I do have the ability to run a new drain all the way down to the basement and add a y connector that would keep the old galvanized pipe as mostly a vent.

I am a little concerned with the space I have in the ceiling to pull this off but I think I can do it. I am more concerned about the small 2 in drop where the pipe exits to the stack if I use it as a vent. (Please see images below)

Can someone give me an opinion of what I have proposed? Would the existing horizontal pipe work as a vent in this situation or would I be making any regressions here?

Today: Today

Proposed: Proposed

Photo: Photo

  • are there any other things feeding the stack above where the existing drain connects? (and what are they?) – Jasen Jan 29 at 2:54
  • The toilet and bathroom sink drain into the stack at around the same height as the tub drain. – Sealer_05 Jan 29 at 3:27
  • your new setup may need to meet the building code and I don't have the skill to answer that, – Jasen Jan 30 at 5:13
  • I'd think you could just cut out the galvanized pipe and replace it with PVC. Why don't you want to do that? – Greg Nickoloff Jan 31 at 20:02
  • Because there is no room to piece one in between the joists because it would add knuckles and it's already extremely tight. – Sealer_05 Feb 1 at 21:02
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It appears your floor joists are already compromised by being notched out for the old drain pipe. But, to answer your question, since you have no vent now I think your plan is at least an upgrade.

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