Adding 3rd floor bathroom to pre-existing drain stack

Discussion in 'IPC Plumbing Code Questions' started by Michael Classe, Jul 24, 2020.

  1. Michael Classe

    Michael Classe New Member

    Joined:
    Jul 24, 2020
    Location:
    Charlotte, North Carolina
    Charlotte - NC:

    I've been thinking about this project on and off for a few years and I've finally had some time to sit and plan it. 3 story single family house, second owner. During construction, an independent waste stack was run to the 3rd floor and capped. The previous owners didn't want a bathroom on the 3rd floor. I do. The independent stack is capped right under an area perfect for a bathroom, but it is really tight under the floor. I can't get 1/8" fall if I use a traditional closet bend which is why I'm using the 45 degree flange into a wye. Everything in black was there when I bought the house, red is what I'm proposing to add. Any suggestions or recommendations would be greatly appreciated!

    3rdFloor1.jpg

    Mike
     
  2. Stuff

    Stuff Well-Known Member

    Joined:
    Mar 7, 2013
    Location:
    Pennsylvania
    1. You can change to 2" upstream of the toilet
    2. Instead of 45º closet bend, use normal 90º going to horizontal wye?
    3. Tie the shower in between the toilet and lav.
    4. Instead of AAV go through the roof for a real vent.
     
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  4. Michael Classe

    Michael Classe New Member

    Joined:
    Jul 24, 2020
    Location:
    Charlotte, North Carolina
    Thank you very much for your feedback! This required some additional design changes to incorporate, hopefully I'm getting closer. Appreciate any comments.

    1) You can change to 2" upstream of the toilet.
    Done
    2) Instead of 45º closet bend, use normal 90º going to horizontal wye?
    Done
    3) Tie the shower in between the toilet and lav.
    Since we changed the arrangement, the shower is now the most downstream fixture and should accept the horizontal wet vent, right?
    4) Instead of AAV go through the roof for a real vent.
    I put an option to connect to the existing vent stack / stack vent. It's going to take a run of 25' of 2" to get there, so I'd really prefer to utilize an AAV unless there is a really good reason not to.

    3rdFloor2.jpg
     

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