Washing Machine standpipe height?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by katespade, Sep 4, 2013.

  1. katespade

    katespade New Member

    Messages:
    1
    Location:
    San Jose
    GE high efficiency washing machine drum broke. Replacing with LG high efficiency 5.1 cu. ft. model. The current setup is such that the p-trap is 2 feet above ground and the standpipe is 1.5 inches pipe that is 21 inches in length. Would that work for the LG 5.1 cu. ft model ? I had absolutely no problems with the previous washing machine as far as draining was concerned.
    Tks.

    Last edited by a moderator: Sep 4, 2013
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,503
    Location:
    Cave Creek, Arizona
    No way to tell you. It depends on how fast the washer pumps the water out. If the 1 1/2" riser is adequate it will drain, if not it will overflow.
  3. Terry

    Terry Administrator Staff Member

    Messages:
    14,903
    Location:
    Bothell, Washington
    Like mentioned above, is the pipe is clear and fast running, it may work.
    In the last fifty years or so, they moved to a 2" trap and line. However, there are still plenty out there done with 1.5" that are still in use.

    I sometimes make the standpipe 2" if its open and I can make the change easily.
  4. asktom

    asktom Member

    Messages:
    529
    Location:
    Victor, MT
    If it is open, I have made the standpipe 3" or 4" (strap it to the wall).
  5. dj2

    dj2 Member

    Messages:
    409
    Location:
    California
    Ideally, the standup pipe should be about 42"-48" tall.
  6. asktom

    asktom Member

    Messages:
    529
    Location:
    Victor, MT
    The UPC states the standpipe must be between 18" & 30" tall. Most plumbers go for 30".
  7. dj2

    dj2 Member

    Messages:
    409
    Location:
    California
    A standard washer is about 36" tall. The panel is another 6" or so. Together we have, where is my calculator oh here it is, about 42". So around here, the stand pipes are 42" to 48" tall.

    Newer washers are on pedestals and are even taller than 42".
  8. asktom

    asktom Member

    Messages:
    529
    Location:
    Victor, MT
    The standpipe is 18" t0 30" tall (usually 30"). The trap is roughed in at 6" to 18" above the floor (commonly 12"). (UPC 804.1). 30" + 12" = 42". The trap can be roughed in at up to 18", which gives 48" total height.
  9. dj2

    dj2 Member

    Messages:
    409
    Location:
    California
    ...Now it's clear...
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