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Thread: Washing Machine standpipe height?

  1. #1
    DIY Junior Member katespade's Avatar
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    Default Washing Machine standpipe height?

    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.

    That puts the top of the standpipe at 45" from the floor
    edit by Terry
    Last edited by Terry; 09-04-2013 at 06:56 PM.

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    Moderator & Master Plumber hj's Avatar
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    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.
    Licensed residential and commercial plumber

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    Forum Admin, Expert Plumber Terry's Avatar
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    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.

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    DIY Senior Member asktom's Avatar
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    If it is open, I have made the standpipe 3" or 4" (strap it to the wall).

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    DIY Senior Member dj2's Avatar
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    Ideally, the standup pipe should be about 42"-48" tall.

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    DIY Senior Member asktom's Avatar
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    The UPC states the standpipe must be between 18" & 30" tall. Most plumbers go for 30".

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    DIY Senior Member dj2's Avatar
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    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. #8
    DIY Senior Member asktom's Avatar
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    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. #9
    DIY Senior Member dj2's Avatar
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    Quote Originally Posted by asktom View Post
    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.
    ...Now it's clear...

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