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Thread: Bathroom DWV Layout

  1. #1
    DIY Member handyman923's Avatar
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    Default Bathroom DWV Layout

    I am putting a small addition on the back of our house with a new bathroom. I was hoping I could get some reviews of my DWV layout. It is a simple bathroom with the vanity, toilet, and tub/shower.

    Originally I was going to use a horizontal wet vent, but my plumbing inspector told me that the toilet has to be the first fixture, so I am stuck venting each fixture.

    I am in Portland, Oregon, so we use the UPC.

    Thanks in advance!Name:  Bathroom Vent.jpg
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  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Here is a nice link to Bert Polk's plumbing tips

    You could wet vent the lav over the toilet if the trap arm is within 42".
    I would run the tub in 2" until you take off for the trap arm.
    Fittings below the flood level need to be drainage, not vent fittings.

    Last edited by Terry; 07-05-2012 at 10:46 PM.

  3. #3
    DIY Member timf's Avatar
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    I’m not a professional, but a few thoughts and observations…

    1) Venting all the trap arms like you show is good
    2) For the lav and tub, although maybe not required by code, I’d consider 2” drain lines
    3) Off the rolled wye on the toilet vent (if rolled 45 degrees), I think the 45 you show may need to be a 60
    4) For the toilet vent elbow, use a long sweep 90 where the vent goes from horizontal to vertical

  4. #4
    DIY Member handyman923's Avatar
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    Thanks for the feedback...

    I have changed the fiitings below the flood line to all drain fittings. I like Terry's idea of using a wet vent for the lav, but I think it will probably be over 42". I'll have to play around with the 45 or 60 at the rolled wye.

    I have updated my sketch and highlighted my changes.

    Thanks again!

    Name:  Bathroom Vent 2.jpg
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  5. #5
    In the Trades Tom Sawyer's Avatar
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    The vent for the toilet MUST rise vertically until it is 6" above the flood level rim of the highest fixture served which in your case would be the lav so, that flat section between the rolled 45 and the elbow can NOT be flat.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  6. #6
    DIY Member handyman923's Avatar
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    What defines vertical? Is it 45 degrees to the horizontal or more? If so, maybe I can slope that flat section up until I get into the wall.

  7. #7
    In the Trades Tom Sawyer's Avatar
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    It has to be at an angle of 45 degrees or more
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  8. #8
    DIY Junior Member goat's Avatar
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    hi terry, that's a great link '' Burt Polk's plumbing tips '' you think you could list some more comprehensive links relating to drain and venting coeds, I live in NC, if it matters.

  9. #9
    DIY Junior Member goat's Avatar
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    Quote Originally Posted by goat View Post
    hi terry, that's a great link '' Burt Polk's plumbing tips '' you think you could list some more comprehensive links relating to drain and venting coeds, I live in NC, if it matters.
    I'm new to forums so my formatting and ability to display images is poor. But I'd gladly take advice from anyone with coed abiding plumbing advice particularly at this time drains and venting. Any good links would be helpful. thank you for your time.

  10. #10
    DIY Senior Member asktom's Avatar
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    You need clean-outs.

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