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Thread: Washer stand pipe, trap, and drain within one stud bay

  1. #1
    DIY Member bsperr's Avatar
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    Default Washer stand pipe, trap, and drain within one stud bay

    I'm re-plumbing our washing machine and am planning to use a sioux chief ox-box in the configuration shown in the picture. It's a 2*4 wall with studs placed 16" on center (so around 14 1/2" space between the studs). The instructions to the washing machine box say that everything should fit within the stud bay, but when I lay all of the parts out like in the picture, it takes up too much space. I was thinking I could angle the stand pipe a little bit or put in an offset on the standpipe to gain some space, but then it doesn't seem like the pipes wouldn't be seated squarely. Does anyone have any experience with these boxes or know why this configuration isn't working for me? Are there 2" p-traps that maybe take up less space? Thanks.
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    Forum Admin, Expert Plumber Terry's Avatar
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    Are you using a Santee like in the picture, or a combo?
    Are you using a solvent weld (glued) p-trap, or one with a swivel nut. the swivel nut is not legal in a wall.

    You can offset the standpipe if needed, or drill through to the next bay.
    Most of the time, I drill through from a studbay nearby.
    I also like to use a single box with valves and drain.
    Last edited by Terry; 05-27-2010 at 08:39 AM.

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    DIY Member bsperr's Avatar
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    I'm using a regular santee and a solvent weld p-trap. I thought there might be something real basic that I'm missing, but it could be that the claim that it fits within one stud bay (without a little modification) isn't too accurate.

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    Moderator & Master Plumber hj's Avatar
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    It would fit if you used a shorter piece of pipe between the trap and the tee, but then I would NEVER use that configuration regardless of how it fit.

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    DIY Member bsperr's Avatar
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    Quote Originally Posted by hj View Post
    It would fit if you used a shorter piece of pipe between the trap and the tee, but then I would NEVER use that configuration regardless of how it fit.
    Do you think it's best to just drill over into the next stud bay?

  6. #6
    Moderator & Master Plumber hj's Avatar
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    I would, and I would use a "one piece" washer box so there is better access to the valves.

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    DIY Senior Member DavidTu's Avatar
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    Are most one-box washer boxes created equal or are there favorites brands/models you guys have for higher-quality or more sturdy units?

    Thanks.

  8. #8
    Plumber jimbo's Avatar
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    The developed length of the trap arm must be minimum 4". What you show is probably under that, meaning it is an S trap.

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    Moderator & Master Plumber hj's Avatar
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    ANY trap with a vent, unless the arm is too long, is NOT an "S" trap, regardless of how short the arm is. There are many washer box designs and each has its own unique features. You use the one which suits your needs the best.

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