New Washing Machine Drain Trap Location?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by molo, Sep 25, 2009.

  1. molo

    molo Member

    Sep 23, 2006
    Cold New York
    I am installing a washing machine. I plan to have the pipe come 36" above the floor and am wondering if it's acceptable to locate the trap below the floor. Is this too far from the top of the standpipe?

    Thanks for any replies :)
  2. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    The trap needs to be on the same floor as the fixture.

    When the standpipe is too long, it siphons.

    Last edited: Jun 2, 2010
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  4. Winslow

    Winslow Plumber

    Dec 30, 2005
    According to the UPC the standpipe must be between 18-30 inches measured from the trap and the trap must be between 6-18 inches above the floor. You cannot locate the trap underneath the floor.

    Last edited by a moderator: Jun 2, 2010
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