Toilet drain pipe running sideways?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by BobT3354, Jun 9, 2008.

  1. BobT3354

    BobT3354 New Member

    Jun 9, 2008
    Milwaukee, WI
    I am helping my brother with his bathroom remodel. It is a 100+ year old house that has been updated at various times over the years. When we took up the subfloor near the toilet, I noticed that the drain pipe from the toilet runs sideways, or even a slight reverse slope for a little bit (less than a foot) before it ties into the stack. The toilet has always worked fine, but I'm wondering how this could possibly work? Is it just that the volume of water coming from the toilet washes through the sideways part and down the stack or what? I guess I'm just worried about putting the floor back down like this.
  2. Mikey

    Mikey Aspiring Old Fart, EE, computer & networking geek

    Nov 8, 2005
    Hansville, Washington
    Ideally you'd have the recommended 1/48 slope (1/4" per foot) in the line. The line is probably a 4" CI (?), so if it's sloped a little bit backward, then you'll have a little bit of a puddle left at the lower end when things settle down after a flush, but not likely any waste to speak of. If it's "always worked" I wouldn't bother fixing it. A real plumbing pro might have a different opinion.
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  4. SuperDaddy

    SuperDaddy New Member

    Mar 25, 2008
    New York
    Ha. My toilet drain pipe goes "sideways" for over 20 feet before leaving the house.
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    Horizontal is fine if it has some slope to it. The larger the pipe, the less it needs.
  6. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    The pipe could come frontwards for all the toilet cares. All it wants is a hole in the floor to sit on top of. Once the waste is in the pipe the toilet's job is done.
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