Basement bathroom - struggling for layout ideas

Discussion in 'IPC Plumbing Code Questions' started by Greg Reed, Apr 9, 2020.

  1. Greg Reed

    Greg Reed New Member

    Joined:
    Feb 16, 2020
    Location:
    Colorado
    I'm planning to add a bathroom to my basement, but struggling for a good layout. As you can see from the attached layout, I have two 3" stacks coming down from the first floor. I'm ASSUMING its a straight line from the 1st to the 2nd (running right to left in the pic). After that, I have no idea where the pipe goes. Also don't know if the pipe grows to 4" somewhere? I do have access to underneath the stair landing, obviously with limited headroom.

    Any suggestions for a good layout?
    (Venting is another challenge - only vent to tie in to is the 1 1/2" one at the laundry sink. But I have to cross under the stair landing, at a height of ~ 42")

    Code is 2015 IPC , according to town website (not sure why not 2018 yet, but anyway ...)

    upload_2020-4-9_10-31-52.png
     
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL

    Attached Files:

  3. Sponsor

    Sponsor Paid Advertisement

     

    Attached Files:

  4. Greg Reed

    Greg Reed New Member

    Joined:
    Feb 16, 2020
    Location:
    Colorado
    Thanks for quick reply. But perhaps my description wasn't accurate. That stack is coming down from above, then turns 90 deg to horizontal under the basement slab, running top right to bottom left in the pic. This bathroom group is on that same slab. So as you have drawn it, the waster almost does a 360 deg turn?
     
  5. Greg Reed

    Greg Reed New Member

    Joined:
    Feb 16, 2020
    Location:
    Colorado
    I'm thinking now about this as a possibility. Shower to tie in separately, with its own vent.
    Toilet to tie in before shower, wet vented from lav. The lav drain would run horizontally in the wall, drop to vertical above 3" toilet line.
    upload_2020-4-9_11-52-9.png
    Thoughts ??
     
  6. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Got it. I misinterpreted So looks like you can wet vent the toilet with the lav before it joins the flow, and the shower gets its own dry vent. Dry vent is vertical, and can be an AAV.

    This is the same as yours.
     

    Attached Files:

  7. Greg Reed

    Greg Reed New Member

    Joined:
    Feb 16, 2020
    Location:
    Colorado
    Finally, like this:

    I'm having a hard time to make a normal 3D "stick man" sketch that shows this.
    upload_2020-4-9_13-46-41.png
     
  8. GTPlumber

    GTPlumber New Member

    Joined:
    May 22, 2020
    Location:
    Atlanta, GA
    This doesn't have to do with your situation, but according to 2018 IPC, can you not just wet vent the shower from the LAV as well. Did the 2018 IPC remove the requirement of the Lav being the last fixture in a wet vented area?

    I know yours is 2015, I'm just wondering about 2018 however.
     
  9. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    See https://wabo.memberclicks.net/assets/pdfs/Plumbing_Venting_Brochure_2018.pdf Figure 1 on page 12. I don't know what the 2015 version said.
     
Similar Threads: Basement bathroom
Forum Title Date
IPC Plumbing Code Questions No Future Vent In Basement--Where do I vent Toilet, Sink and Shower Mar 3, 2020
IPC Plumbing Code Questions Where to tie in new basement vent Feb 16, 2020
IPC Plumbing Code Questions Moving basement Washing Machine Jan 3, 2020
IPC Plumbing Code Questions Moving basement stack & vent question Aug 10, 2019
IPC Plumbing Code Questions Basement plumbing Apr 4, 2019

Share This Page