Plumbing Bathrooms above each other

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by boboIam, Jun 14, 2019.

  1. boboIam

    boboIam New Member

    Joined:
    Jun 14, 2019
    Location:
    Louisville, KY
    Hi I'm trying to figure out how to plumb these two bathrooms in my renovation. It's a full bath on the first floor and a second floor master bath. They're stacked above each other.

    Routing the pipes for waste and vent is a little tricky for me to figure out it seems for a few reasons. First, the bathrooms sit against the stairs on both floors, so on the toilet wall, there are beams under the sole plate supporting the staircase. Secondly the second floor bathroom is deeper and wider, so two of the perimeter walls don't line up. The walls that do line up is the exterior wall and the wall against the stair case. Third, on the second floor we're adding a washer and dryer on the other side of the wall shared by the vanity. I would like to plumb everything into the basement and then route it out from there.

    Could I route the stack up the doorway wall in the first floor, make a turn for about a foot, then go up the second floor bath's doorway wall? Could I use an exterior wall? I'm attaching the drawings, one of the first floor, one of the second and one with the two drawings overlaid. I'm in Kentucky. Walls are 2x4.

    Thanks in advance for the help wrapping my head around this. I'm sure that I'm leaving needed info out, apologies in advance for that.

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  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    A lot depends on the direction of the floor joists and where the bearing points are.
    How high are the ceilings? Perhaps going below the floor joists and dropping the ceiling.

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    The washer can't be included in any wet venting as it's a pumped fixture.
     
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  4. boboIam

    boboIam New Member

    Joined:
    Jun 14, 2019
    Location:
    Louisville, KY
    Thanks Terry, the joists run parallel with the front of the house. Ceilings are only 8', so don't want to drop them.
     
  5. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Your drawing did not label the front. Is that the top of the pictures?
     
  6. boboIam

    boboIam New Member

    Joined:
    Jun 14, 2019
    Location:
    Louisville, KY
    Sorry, the front is the left side of the drawing.
     
  7. Stuff

    Stuff Active Member

    Joined:
    Mar 7, 2013
    Location:
    Pennsylvania
    To be blunt: Your questions make it seem like you are in over your head. Get a quote from a plumber.With all of the walls open the price might not be too bad.

    It is common to have a stack in the outside wall. Hot and cold supplies have a problem with freezing in northern climates, though, so they get run in interior walls.

    Whatever wall you put a stack in should be 2x6. Google wet wall.
     
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