Side draining bath tub

Discussion in 'Shower & Bathtub Forum & Blog' started by ej43, Jun 3, 2009.

  1. ej43

    ej43 New Member

    Messages:
    3
    I need to install bathtub on the floor where ther is no space for P-trap.

    How far from a tub drain can the trap be located?

    That is, can I run a horizontal drain for 3 feet (at about 1 inch drop) and install a P-trap and a vent 3 feet away from the tub drain?

    Or is it asking for trouble?
  2. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    Trap must be below the fixture drain.
  3. ?

    I paid a Master Plumber and he installed the P trap 3 feet away.

    I don't think "code" requires it to be under the tub drain.

    A couple years ago I installed a sink Ptrap a few feet away from the sink drain and I got input here from hj terry and others on how to do it.
  4. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    You're right, I looked back at the code again.
    This is 2009 Florida Plumbing Code, it is similar and sometimes identical to the IPC.

    1002.1 Fixture traps. Each plumbing fixture shall be separately trapped by a water-seal trap, except as otherwise permitted by this code. The vertical distance from the fixture outlet to the trap weir shall not exceed 24 inches (610 mm) and the horizontal distance shall not exceed 30 inches (610 mm) measured from the centerline of the fixture outlet to the centerline of the inlet of the trap
  5. ej43

    ej43 New Member

    Messages:
    3
    Thanks, that looks encouraging.

    Besides violating the Florida Plumbing code by 6 inches, what problems can I encounter by placing the trap 3 feet away?
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,273
    Location:
    New England
    There will be a (hopefully small) accumulation of soap scum, body oils, dead skin, etc. build-up on the walls of the pipe. 3' of that can smell pretty raunchy. That's why the better location for the trap is right under the fixture...the water in the trap blocks not only traditional sewer gasses, but the smells from the drain line going there.
  7. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    Are you in Florida? Your location or jurisdiction might differ.
  8. ej43

    ej43 New Member

    Messages:
    3
    Good point.
    How would I clean the pipe?

    BTW, not sure if it is important here, but everything will be draining into the sewage ejection system and then pumped up.
  9. 30 inches is 762 mm. A limit has to be imposed at some point. Stretching it is a normal human endeavor.

    If this quote was retyped, it's data entry error.
    If it's copied, it's a typo in the original document.
    24 inches (610 mm)
    30 inches (610 mm)
    If I were you, I'd measure everything in metric and allow myself a margin of error in my favor. :)
  10. SewerRatz

    SewerRatz Illinois Licensed Plumber

    Messages:
    1,705
    Location:
    Chicago, IL
    24" in Illinois

    Distance of Trap to Fixture. The developed length from the fixture outlet to the trap weir shall not exceed 24 inches, except when an interceptor is used as a trap, it shall be located as close as possible to the fixture. The maximum developed length from the fixture outlet to the inlet of the interceptor shall not exceed 5 feet. (See Appendix D: Illustration B.) The standpipe inlet for an automatic clothes washer shall not exceed 48 inches above the weir of a trap.

    So your best bet is to contact your local building department and ask the plumbing inspector there what they require locally. State codes are the bare minimum, which means counties, townships, and cities can make the code even tougher.
    Last edited: Jun 5, 2009
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