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Thread: Laundry drain pipe help for s-trap location. Canada

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    DIY Junior Member klrman's Avatar
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    Default Laundry drain pipe help for s-trap location. Canada

    Hi, I'm new here My house is very old and still has a 1 1/12 inch laundry drain pipe. It runs 40 feet across my crawlspace. I'm going to vent it and know how to do that correctly, but since the drain pipe is only 1 1/2 inches instead of the standard 2 inch and I need to re-locate it to the back wall, would it be more ideal to locate the s-trap lower than 24 inches from the top to offset possible back spill? I was thinking 36 inches or so but I'm not really sure.

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    Plumber krow's Avatar
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    Quote Originally Posted by klrman View Post
    Hi, I'm new here My house is very old and still has a 1 1/12 inch laundry drain pipe. It runs 40 feet across my crawlspace. I'm going to vent it and know how to do that correctly, but since the drain pipe is only 1 1/2 inches instead of the standard 2 inch and I need to re-locate it to the back wall, would it be more ideal to locate the s-trap lower than 24 inches from the top to offset possible back spill? I was thinking 36 inches or so but I'm not really sure.
    I 'm not really clear what you are asking.

    But, s-trap are not allowed anywhere in north America....... except maybe Mexico (maybe you mean p-trap) Let us know if you have a laundry sink in your set up. Regardless of whether you do or not, whether its 1 1/2" or 2 ", you need to install a clean out at the 20' mark beyond your p-trap or have access to 20' of pipe in both directions from a clean out (for rodding purposes.)

    To answer your original question , as best as I can understand it, (without a laundry sink) it can go at any hieght, prefferably a 2" diameter drain line. 36" - 40" is a comfortable height.

  3. #3
    DIY Junior Member klrman's Avatar
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    Sorry I meant p-trap. No laundry sink. I just wasn't sure how low the p-trap should be from the top of the standpipe? (drainpipe for wash machine) if the standpipe is around 40 inches?

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    Forum Admin, Expert Plumber Terry's Avatar
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    Just increase the standpipe to 2"
    That will give you some added volume.

  5. #5
    DIY Junior Member klrman's Avatar
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    Quote Originally Posted by Terry View Post
    Just increase the standpipe to 2"
    That will give you some added volume.
    Like 2" stand pipe, 2" p-trap running into the 1 1/2 inch drain pipe under the house?

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    Moderator & Master Plumber hj's Avatar
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    If the 1 1/2" line is inadequate, and I would suspect that a 40' horizontal line WOULD be, it will overflow regardless of the riser OR trap size.

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