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Thread: Missing vent?

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  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.

  3. #3
    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.

  4. #4
    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
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Size:  23.7 KB

  6. #6
    DIY Senior Member dlarrivee's Avatar
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    I don't see much wrong with your latest drawing, seems common to me.

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