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Thread: Concern about slope

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  1. #1
    DIY Junior Member denikar's Avatar
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    Default Concern about slope

    Hi all,

    Great forum. First time poster with an issue that has been worrying me for a few weeks. I'm installing a new 2nd floor bathroom and have been following the latest Michigan plumbing code. The issue is where the shower drain meets the tub drain I mistakenly drilled the next joist hole too high. Now the "T" there is perfectly level instead of sloping down by 1/4" per foot per code.

    Here is a side view of the "T" in question:
    Name:  Bathroom Project 088sm.JPG
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    Here is a perspective view of the junction:
    Name:  Bathroom Project 096sm.JPG
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    In order for me to resolve the issue I would need to drill a larger hole in the joist which will violate the structual code (no hole within 2" of edge and not to exceed 1/3 of the width of the joist).

    Question is do you think this will be a major issue (with clogging) in the future or am I worrying too much?

    Thanks in advance,

    Tim

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    You have also altered the height of the shower drain, making is an ilegal S trap.
    I see too where you have the tub draining past the shower, which will siphon the shower trap.
    Also, you have a santee on it's side. At the least it should have been a wye fitting.

    Is any of this vented?

    So much wrong, in so little space.
    Last edited by Terry; 02-08-2013 at 06:02 PM.

  3. #3
    DIY Junior Member denikar's Avatar
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    Default

    Thanks for the reply. I guess I'm not sure how the height of the shower drain was altered as I used a complete "P" trap. Right after the "P" trap it slopes down to the T.

    I did not think about the siphoning issue - uggg

    As for venting yes there is one 1.5" vent in-between the shower and the tub. It is located 16" from this T and 16" from the tub drain.

  4. #4
    DIY Junior Member denikar's Avatar
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    Here is a crude sketch of the setup. Seems I have the same siphon issue with the vanity...
    Attached Images Attached Images  
    Last edited by denikar; 02-10-2013 at 05:53 PM.

  5. #5
    Retired Defense Industry Engineer jadnashua's Avatar
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    EACH trap needs its own vent...as drawn, only the tub is vented.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  6. #6
    DIY Junior Member denikar's Avatar
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    Quote Originally Posted by jadnashua View Post
    EACH trap needs its own vent...as drawn, only the tub is vented.
    Understood and will do. Thanks for the reply.

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