Bathroom plumbing

Discussion in 'Shower & Bathtub Forum & Blog' started by carlos mejia, Nov 30, 2019.

  1. carlos mejia

    carlos mejia New Member

    Nov 30, 2019
    I want to add a bathroom in the second floor
    There is a stack (cast iron) sewer line 4" that runs from the basement and comes out to the roof.
    could I tie in into the stack with a 4" 4 way sanitary tee?

    I will use the the 4" to the toilet, the opposite opening to drain the shower and sink and the up and down opening to continue on to the roof.

    There is currently a full bathroom in the basement and in the main floor already
  2. Tuttles Revenge

    Tuttles Revenge In the Trades

    Oct 15, 2014
    Very likely that stack is the vent from the plumbing on the floors below. It shouldn't be used as a drain stack. The proper way to connect is below the point where the vents connect.

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