Preferred lavatory drain location in vertical stack with toilet

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by augielocost, Feb 19, 2020.

  1. augielocost

    augielocost New Member

    Feb 18, 2020
    Hello - I am adding some venting to a very old house that needs more. I'm moving the toilet to take advantage of the new vertical vent and am wondering if there is a preferred location of where the sink connects to the vertical stack - above or below the toilet inlet. I cannot use a combination fitting to have both sink and toilet enter at the same vertical location and need to have separate connection points. The house is governed by IPC code. The vent is 2" and the stack is 3". They will run directly to the sewer at the lower level with no other fixtures entering the stack and a tub on the floor below will enter the horizontal Drain Options.JPG drain but it has it's own separate vent.
  2. Reach4

    Reach4 Well-Known Member

    Sep 25, 2013
    Much simpler. The lavatory sanitary tee can go inline to the sanitary tee for the toilet that serves the same bathroom as the lavatory. Two sanitary tees total. This would be the case for IPC or UPC. You could go smaller on your piping above the toilet santee, but 3 inch would be more than enough.

    Either of what you sketched would be permitted, but would not required or common.
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