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Thread: Missing vent?

  1. #1
    DIY Junior Member jbg's Avatar
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    Default Missing vent?

    Hey Folks-

    Great Forum. This weekend I went to move a 2nd floor toilet 6 ft from existing spot to create an alcove for it. I opened up some of the first floor ceiling to see what I was up against. Below is what I found. Toilet is direct to 3" soil stack. The tub and shower have branch drains to the 3" soil stack which runs down the front wall of the house. Tub and shower are vented to vent stack at back corner of house. First question is, am I missing a vent for the toilet? If so, any ideas how to easily fix this?

    missing vent.pdf
    Last edited by jbg; 01-24-2011 at 12:13 PM. Reason: attachment

  2. #2
    Test, Don't Guess! cacher_chick's Avatar
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    One would need to know where and how the lavatory is attached to the system to say for sure. Many areas allow the WC to be vented through the lav.

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    DIY Junior Member jbg's Avatar
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    Thank you cacher. The 3" waste pipe starts at the 2nd floor toilet via two 45 degree angles from the toilet, then travels 8 ft horizontally, then 90 degree turn and straight down to the slab. If the Shower and tub branch drains didn't connect to the 3" waste pipe during the horizontal run, it would be a dedicated waste pipe for the toilet only. Nothing else hooks into it below or above it. Seems like the branch waste drain is the only vent for the toilet.

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    Test, Don't Guess! cacher_chick's Avatar
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    As you have drawn it, the toilet line can pull air through the tub and shower vents, but this is not a proper vent for the toilet.

  5. #5
    DIY Junior Member jbg's Avatar
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    Thanks Cacher. I misspoke. After a few more openings in the ceiling one of the branches is not from the shower but the sink. So it looks like the attached. I think this is OK but not great. If I move the toilet drain to the other side of the 3" soil stack but within 3ft of the branch drain/vent am I still OK?
    Name:  Vent.bmp
Views: 444
Size:  23.7 KB

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    DIY Senior Member dlarrivee's Avatar
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    I don't see much wrong with your latest drawing, seems common to me.

  7. #7
    Test, Don't Guess! cacher_chick's Avatar
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    What you have now drawn is what I would have expected to see.
    Not clear on where the toilet is being moved to, but it has to be upstream of the 2" coming off the lav or your vent will be broken.

  8. #8
    Moderator & Master Plumber hj's Avatar
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    As long as the "vent" is being "washed" by the lav or shower/tub the orientation of the toilet is immaterial. "Moving the toilet 6 feet" however COULD be a problem.

  9. #9
    DIY Junior Member jbg's Avatar
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    Thanks Everyone. I wasn't as clear as I should have been. In that last drawing, I wanted to move the toilet to 3 ft on the other side of where that branch drain comes in. If that causes a vent issue, I guess I could move the toilet and the extend that branch drain a few more feet to come in down stream of the toilet. Would that work better?Name:  Vent.bmp
Views: 339
Size:  26.0 KB
    Last edited by jbg; 01-26-2011 at 11:57 AM.

  10. #10
    Test, Don't Guess! cacher_chick's Avatar
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    You need to find out what the maximum allowed distance is between the WC and it's vent.

    Should not have any 3" upstream of the WC. The tub and/or lav will not be able to clean the 3" line.

  11. #11
    DIY Senior Member dlarrivee's Avatar
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    Quote Originally Posted by cacher_chick View Post
    Should not have any 3" upstream of the WC. The tub and/or lav will not be able to clean the 3" line.
    Although I agree there shouldn't be 3" upstream of the w/c... I don't see it causing a huge problem, what exactly needs "washing" upstream of the w/c?

  12. #12
    DIY Junior Member jbg's Avatar
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    I'll look to see if I can move the branch downstream of the WC. Thank you very much for you help on this

  13. #13
    DIY Senior Member dlarrivee's Avatar
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    Quote Originally Posted by jbg View Post
    I'll look to see if I can move the branch downstream of the WC. Thank you very much for you help on this
    That isn't what we are getting at... you've mistaken something there.

    The piping only needs to be 3" downstream of the w/c, leave your drawing the same but make sure you use 2" upstream of the wye where your w/c ties in.

  14. #14
    DIY Junior Member jbg's Avatar
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    Ah. Great. That makes my life a lot easier. I really appreciate the help.

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    Homeowner geniescience's Avatar
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    Must know the total distance of the NEW 2" pipe, and its fall (drop, slope).

    Even if you do everything as said above, you can still cause a big problem. Best is to hire a Master Plumber. Next best is to leave it as is. Worst is to build something new, based upon a little bit of internet learning. If you want to go ahead and move the pipes around, you still need to answer the question in my first sentence, and a few other questions. Posting a very accurate drawing is best. Next best is posting a drawing showing distances.

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