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Thread: Is this shower drain to code?

  1. #1
    DIY Junior Member Mikeiii's Avatar
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    Default Is this shower drain to code?

    Can a shower drain be added to this existing washing machine drain?

    The pink pipes in the diagram would be new?

    Thanks

    Mike

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  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    No, when the WM was running, it would siphon the proposed shower drain dry. EACH trap needs a vent. Depending on how big that pipe is, you might be able to do it IF you added a vent, but a WM drain line can be problematic. You don't want sudsy water getting pumped into your shower!
    Last edited by jadnashua; 02-05-2013 at 08:18 PM. Reason: changed drain to vent....
    Jim DeBruycker
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    DIY Junior Member Mikeiii's Avatar
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    Thanks for the answer.
    I know very little about drains but I'm trying to remove a shower wall that contains a vent. (the green wall in the diagram)

    Would there be too many bends in the line to bring the shower drain to the vent in wall A and from there back to the current drain below the green wall?

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  4. #4
    DIY Junior Member Mikeiii's Avatar
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    Would this setup work?
    Attached Images Attached Images  

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    Test, Don't Guess! cacher_chick's Avatar
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    If you look at your first drawing you will note that the vents are vertical. They have to be that way to ensure that no waste ever backs into the vent and stays there.

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    DIY Junior Member Mikeiii's Avatar
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    Thanks.
    I'm starting to understand.
    I do have a sink drain with a vent that is vertical but it would be a 6ft run from the shower trap.
    Is that too far?

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    Retired Defense Industry Engineer jadnashua's Avatar
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    The vent must come off of the trap arm before the waste turns down, and must be within 5' with a 2" pipe. It must go vertical before it can go horizontal.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    DIY Junior Member Mikeiii's Avatar
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    Thanks I think it is going to work.

  9. #9
    Plumber Sean Beck's Avatar
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    Quote Originally Posted by Mikeiii View Post
    Can a shower drain be added to this existing washing machine drain?

    The pink pipes in the diagram would be new?

    Thanks

    Mike

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    You could say that the drain upstream of the proposed pink drain could be a wet vent, and providing that that drain is 1.5", then it can take up to 2FU (fixture units) which would cover the washing machine. You just have to make sure the distance from the trap of the shower to the proposed wet vent would be more than 2 x the diameter of the drain pipe (so probably 3 inches).

  10. #10
    Test, Don't Guess! cacher_chick's Avatar
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    Most codes only allow wet venting bath groups, so venting past the laundry would not be permitted.

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    Forum Admin, Expert Plumber Terry's Avatar
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    Right.
    No inspector would allow a washer in any wet vent situation. That washer would suck the trap so fast it wouldn't be funny.

  12. #12
    In the Trades Tom Sawyer's Avatar
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    Not only that but the washing machine rain has to drain into a 3" or larger horizontal or vertical branch.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  13. #13
    DIY Junior Member frodo's Avatar
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    can you do this ..
    the tree of liberty must be refreshed from time to time with the blood of patriots and tyrants
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