Ask Experts Questions for FREE Help !
Ask

    Venting Basement Toilet in same wall with Soil Stack

    Asked Oct 26, 2008, 09:11 PM 12 Answers
    Hi,
    I'm new to the forum, found it through googling my plumbing questions. It has helped already. Here is my question. I am confused about venting my toilet and keeping it in the path of the main drain under the slab. In other words the main stack will be dropping down the wall in essentially the same location where I would like the vent stack to run. I'm struggling figuring out all the connections for the toilet drain and vent; any assistance would be greatly appreciated. This is essentially new construction, so I have some flexibility in the location of the drain, except that it must slope left to right in this layout of the bathroom:

    Attached Images Attached Images  
    Search this Thread
    Share |
    12 Answers
    speedball1's Avatar
    speedball1 Posts: 28,585, Reputation: 1908
    Senior Plumbing Expert
     
    #2

    Oct 27, 2008, 04:35 AM


    Good morning Gary,
    You haven't given us much to work wit. Go back and draw in the main stack vent from above. How about the under slab drainage? Is it in or do you have to rough it in yourself? Where does the main run under the slab? All you've given us is a fixture lay out with no other details. No main under the slab to tie to, No stack vent coming down from above that might give us some idea where the main was located. In short go back a connect some of the "dots" for us. Back to you, Tom
    Helpful
    Gary65's Avatar
    Gary65 Posts: 7, Reputation: 1
    New Member
     
    #3

    Oct 27, 2008, 07:38 PM

    Thanks for your response. This is essentially new construction. There are currently no stacks and no main drain. I want to place them such to provide the dry vents as is best practice. My only limitation is that I'd prefer the stacks in the wall as indicated and that the drain will need to run in the direction indicated. It's a clean slate that I want to do the best way possible.
    Helpful
    Gary65's Avatar
    Gary65 Posts: 7, Reputation: 1
    New Member
     
    #4

    Oct 30, 2008, 08:08 PM

    I'm not sure what else I can add. Is there a more appropriate forum for new construction?
    Thanks,
    Gary
    You did just fine Gary It would have neen nice if you had drawn in the location of the stack vent and where you think the main ran but we can work with what we have. Tom
    Helpful
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 6,039, Reputation: 393
    Plumbing Expert
     
    #5

    Oct 30, 2008, 11:28 PM



    Gary, Enclosed is how I would run your rough-in drains/vents. Red line indicate drain lines, blue dots vents for each plumbing fixtures. You can combine vents above anti-siphon level and run single vent all the way to the roof. Get back to me if you have any other question. Milo
    Attached Images
     
    Helpful
    speedball1's Avatar
    speedball1 Posts: 28,585, Reputation: 1908
    Senior Plumbing Expert
     
    #6

    Oct 31, 2008, 05:43 AM


    Milo'sgiving you the UPC version which runs a vent on everything except the family dog. My code's a little more user friendly and doesn't require as many fittings. Of course if you live in California you're just out of luck.
    Helpful
    Gary65's Avatar
    Gary65 Posts: 7, Reputation: 1
    New Member
     
    #7

    Oct 31, 2008, 08:45 PM

    Thank you guys so much, I appreciate the effort. I'm assuming then that in both codes the toilet vent then is a wet vent through the soil stack from the upper floors?

    Thanks again!
    Helpful
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 6,039, Reputation: 393
    Plumbing Expert
     
    #8

    Oct 31, 2008, 11:38 PM

    Gary, under UPC there are no wet vents: there is no other plumbing fixture connected above to any vent.
    Helpful
    speedball1's Avatar
    speedball1 Posts: 28,585, Reputation: 1908
    Senior Plumbing Expert
     
    #9

    Nov 1, 2008, 04:37 AM
    I'm assuming then that in both codes the toilet vent then is a wet vent through the soil stack from the upper floors?
    That vent behind the toilet is a stack vent with fixtures discharging from up above? This is exactly why I asked for more information in mny first post? In that case both drawings are incorrect. One of the basic mandates of both Milos and my codes are that you can not dischaqrge a major fixture past a unvented minor one. In my drawing the lavatory and in Milos drawing the down stairs toilet doesn't have its own dedicated vent. From now on I'm refusing to draw up plans based on guesswork. My fault not yours Gary. Sorry Dude! Back to square one I guess. Tom
    Helpful
    Gary65's Avatar
    Gary65 Posts: 7, Reputation: 1
    New Member
     
    #10

    Nov 1, 2008, 08:06 PM

    I did not draw the soil stack because there is not a specific place that it needs to come down. That is part of my question: where should/could it go to have the best design?I had hoped the note in my drawing would have been adequate "6" wall for main vent stack and soil stack from upper floor..." Had I drawn it in, it would have forced you guys down a design path. I'm not looking for guesswork, just the best drain/vent design. I have a pretty good idea how to do it. I was just looking for a fresh approach from someone with more experience than myself, without any bias towards the design. As I said a clean slate with the givens as shown and in my original post.
    Helpful

Not your question? Ask your question View similar questions

 

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Add your answer here.


Check out some similar questions!

Broken Toilet Vent Stack inside wall? [ 4 Answers ]

We had a leak in our roof. The roofer said it occurred at the one of the exits for the vent stacks on the roof and fixed it. However, he "fixed" all the others. Right after he left I went to flush one of the toilets and it now sounds as if we are next to niagara falls. The bathroom backs up...

Basement toilet vent stack [ 1 Answers ]

I am putting a toilet, shower and sink in my basement, on an outside wall. We are on a septic system and I am chosing to use a collection tank and ejector sewage pump. How do I vent this system? Can I just go out through the joist headers? There is no stack remotely close that goes to the roof that...

Basement toilet way too far from finished wall. [ 4 Answers ]

I had our house built 5 years ago roughed in for 1/2 bath in the basement. Now that I'm finishing the basement, I've run into a problem. All the walls are framed, drywall is up and bath is ready for toilet installation. Much to my chagrin, I realized now that the center of the soil stack is 20"...


View more questions Search