Toilet drain clearance

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by rcoatsie, Oct 3, 2011.

  1. rcoatsie

    rcoatsie New Member

    Messages:
    2
    Location:
    RI
    Hello, ..... I am going to install a toilet above a concrete slab, and run the drain over to the cellar (about 5' of run). I have about 9.5" of space between the bottom of the toilet and the concrete slab. Should I have enough clearance for the correct drain slope ?? I can shorten the 5' run if I have to.

    Thanks ........ Robin
  2. nukeman

    nukeman Nuclear Engineer

    Messages:
    711
    Location:
    VA
    Are you saying that you are putting the toilet on a platform (2x10 joists)? I wonder since you say "I have about 9.5" of space between the bottom of the toilet and the concrete slab."

    Typically, you figure a slope of 1/4" per ft. You won't have the full 9.5" to work with as there needs to be room for the closet bend/elbow below the toilet.

    Please provide some additional details of the install so we can get a better idea of what you are actually dealing with.
  3. Terry

    Terry Administrator Staff Member

    Messages:
    15,289
    Location:
    Bothell, Washington
    You have plenty of space within a 2x10 joist space. The drain will be 1/4" per foot, or 1" in four feet.
  4. rcoatsie

    rcoatsie New Member

    Messages:
    2
    Location:
    RI
    Thanks for the reply. The slab area was part of an attached garage. It is a raised area now, but after we get this bathroom figured out, we are going to be pouring more concrete (radiant floor) around this area. They are 2x8 joists, that have been shimmed off the concrete with some pressure treated wood, so yes basically 2x10s. The bend elbow depth dimension is what I need, along with the 1/4" per ft ??
  5. nukeman

    nukeman Nuclear Engineer

    Messages:
    711
    Location:
    VA
    Correct, but it sounds like you have plenty of room. You'll only need about 1.25" of slope over that 5', so you have plenty of room.
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