Adding a 1/2 bath in basement - this rough in look ok?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by jeff1675, Apr 15, 2013.

  1. jeff1675

    jeff1675 New Member

    Messages:
    2
    Location:
    Syracuse, NY
    New on the forum here but have lurked a long time. Great info from a lot of knowledgeable people. Thanks.

    Just wanted a look at a pretty basic 1/2 bath addition in a basement in upstate NY.

    Tapped into existing 3" drain line under slab. About 2-3' to the right is the main vertical stack coming down from above floors. On the wall to the right is an existing mud-sink with its own vent.

    I understand that because I am within 6' of the stack the toilet will not need its own vent.
    This look ok?


    bath1.JPG bath2.JPG
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,423
    Location:
    Bothell, Washington
    The toilets from above will affect the lower toilet if it's not vented.

    You need a vent between the toilet and the waste stack or waste horizontal.
  3. jeff1675

    jeff1675 New Member

    Messages:
    2
    Location:
    Syracuse, NY
    Thanks Terry
    "will affect" meaning it wont work or something more subtle? This is the case even with 3" lines and the vertical stack less than 3' away from this new wye? Have been told that close it wouldn't need its own vent.
  4. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,282
    Location:
    Land of Cheese
    Look at it this way- the stack is not and cannot be used as a vent if there is any drainage coming into it from above.
    It does not matter what size or how far away it is.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,272
    Location:
    Cave Creek, Arizona
    quote; Have been told that close it wouldn't need its own vent.

    Who told you this? Someone from Home Depot?
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