Is this shower drain to code?

Discussion in 'Plumbing Code Questions' started by Mikeiii, Feb 5, 2013.

  1. Mikeiii

    Mikeiii New Member

    Messages:
    13
    Location:
    California
    Can a shower drain be added to this existing washing machine drain?

    The pink pipes in the diagram would be new?

    Thanks

    Mike

    UpstairsBathShowerDrainPipes.jpg
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,809
    Location:
    New England
    No, when the WM was running, it would siphon the proposed shower drain dry. EACH trap needs a vent. Depending on how big that pipe is, you might be able to do it IF you added a vent, but a WM drain line can be problematic. You don't want sudsy water getting pumped into your shower!
    Last edited: Feb 5, 2013
  3. Mikeiii

    Mikeiii New Member

    Messages:
    13
    Location:
    California
    Thanks for the answer.
    I know very little about drains but I'm trying to remove a shower wall that contains a vent. (the green wall in the diagram)

    Would there be too many bends in the line to bring the shower drain to the vent in wall A and from there back to the current drain below the green wall?

    UpstairsBathShowerDrainPipes1.jpg
  4. Mikeiii

    Mikeiii New Member

    Messages:
    13
    Location:
    California
    Would this setup work?

    Attached Files:

  5. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,236
    Location:
    Land of Cheese
    If you look at your first drawing you will note that the vents are vertical. They have to be that way to ensure that no waste ever backs into the vent and stays there.
  6. Mikeiii

    Mikeiii New Member

    Messages:
    13
    Location:
    California
    Thanks.
    I'm starting to understand.
    I do have a sink drain with a vent that is vertical but it would be a 6ft run from the shower trap.
    Is that too far?
  7. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,809
    Location:
    New England
    The vent must come off of the trap arm before the waste turns down, and must be within 5' with a 2" pipe. It must go vertical before it can go horizontal.
  8. Mikeiii

    Mikeiii New Member

    Messages:
    13
    Location:
    California
    Thanks I think it is going to work.
  9. Sean Beck

    Sean Beck Plumber

    Messages:
    68
    Location:
    Toronto, Ontario, Canada
    You could say that the drain upstream of the proposed pink drain could be a wet vent, and providing that that drain is 1.5", then it can take up to 2FU (fixture units) which would cover the washing machine. You just have to make sure the distance from the trap of the shower to the proposed wet vent would be more than 2 x the diameter of the drain pipe (so probably 3 inches).
  10. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,236
    Location:
    Land of Cheese
    Most codes only allow wet venting bath groups, so venting past the laundry would not be permitted.
  11. Terry

    Terry Administrator Staff Member

    Messages:
    14,770
    Location:
    Bothell, Washington
    Right.
    No inspector would allow a washer in any wet vent situation. That washer would suck the trap so fast it wouldn't be funny.
  12. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,052
    Location:
    Maine
    Not only that but the washing machine rain has to drain into a 3" or larger horizontal or vertical branch.
  13. frodo

    frodo New Member

    Messages:
    12
    Location:
    Mississippi
    can you do this ..[​IMG]
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