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Thread: New shower drain into existing laundry drain?

  1. #1

    Default New shower drain into existing laundry drain?

    I'm planning to install a new standup shower stall on the same first floor as an existing nearby laundry room. So could I conveniently drain the shower into the 2" laundry drain line in the basement that pass right by the location of the new shower stall? I'd plan on installing a 2" drain pipe and trap from the shower unit and Y into the existing 2" laundry line.
    Thanks,
    John

  2. #2
    Plumber BAPlumber's Avatar
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    Jul 2007
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    Vashon, Washington
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    Quote Originally Posted by jsr
    I'm planning to install a new standup shower stall on the same first floor as an existing nearby laundry room. So could I conveniently drain the shower into the 2" laundry drain line in the basement that pass right by the location of the new shower stall? I'd plan on installing a 2" drain pipe and trap from the shower unit and Y into the existing 2" laundry line.
    Thanks,
    John
    if you can fit a 2" p-trap and still get 1/4" per ft. of fall, and vent it, it should be okay. the only other issue is if other fixtures tie into that 2" line.

    If there was a tub or shower there before, there should be a vent already and you could tie into it.
    Brent

  3. #3
    Plumbing Designer FloridaOrange's Avatar
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    Dec 2005
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    Where are you located? Florida code, which is loosely based on the international code prohibits venting a bathroom fixture with a non-bathroom fixture (2004 FPC 909.1). If you could get a vent in to service the bathroom you'd be good to go.
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  4. #4
    Commercial Plumber markts30's Avatar
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    I would check to see if you can tie into the drain - if your tie in is closer than 8' you might be out of luck (sudsing fixture)...
    As well, you would have to vent the shower on it's own (use a combo on the drain line with a san-tee above it then vent out the top and swing the trap arm to the shower drain.)

  5. #5

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    I'm in Connecticut. Thanks for your replies. Guess I'll rely on local authorities on the definitive word.
    John

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