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Thread: Additional Vent Stack Required?

  1. #1
    DIY Junior Member canyonblue77's Avatar
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    Default Additional Vent Stack Required?

    I'm a diy'er that bit off a little more than I can chew, but I'm stubborn and intend to make it happen.
    The attached picture is a very simple version of what I'm in the middle of with plumbing my bathroom reno.

    Basically I want to know if the additional vent stack in green would be required or is the current 4" stack enough venting and close enough?

    Is the "stacked" connection of the drain pipes in blue acceptable? (I intend to use wyes instead of tees although I don't believe it's required)

    Is the fact that the vent technically begins below the height of any of the traps an issue?

    If the green vent would be required, is it ok that all 3 fixtures would be using the same vent.

    And last question... do I have too many bends in my proposed vent stack? (Would be 6 45 degree turns and 1 90 degree turn) It will end up passing through 2 stories and have a developed length of nearly 50 feet.
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  2. #2
    Test, Don't Guess! cacher_chick's Avatar
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    What you have drawn is not allowed anywhere. A fixture's vent connection must be made above the highest fixture's drain connection on the stack.

    Every trap must be vented prior to it's connection to the waste stack.

  3. #3
    Moderator & Master Plumber hj's Avatar
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    1. How "close" the other vent is has absolutely NOTHING to do with whether you need the green vent.
    2.The way you have it drawn, "Y" are not only "not required" but they are illegal
    3. IF it is done correctly, all three fixtures can use the same vent
    4. Air is a gas so the vent can have as many fittings as necessary.
    5. IF the vent "begins below the level of the trap" it is a BIG issue.
    Last edited by hj; 09-27-2013 at 07:00 AM.
    Licensed residential and commercial plumber

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    Forum Admin, Expert Plumber Terry's Avatar
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    The lav needs a vent within 42"
    The shower within 60"
    and the toilet within 72"

    A vent comes off on the high point on a trap arm, not below. A vent below serves no purpose. It's not a vent.

    Here is a nice link to Bert Polk's plumbing tips
    Last edited by Terry; 09-27-2013 at 07:51 AM.

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    DIY Junior Member canyonblue77's Avatar
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    Ok, so factoring those things and narrowing in on the bathroom, the new drawing should be (more) correct...
    Are there additional considerations that I'm missing?

    I appreciate the rapid feed back from both of you!Name:  PlumbPlan2.gif
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  6. #6
    Forum Admin, Expert Plumber Terry's Avatar
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    You still have the vent below the lav and the shower. Why aren't you putting the vent straight up, and using a trap arm at a horizontal to the fixture?

    Here is a nice link to Bert Polk's plumbing tips

  7. #7
    DIY Junior Member canyonblue77's Avatar
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    More a limitation to my drawing ability than my design intention.
    I re-drew using horizontal arms and the identified elbows really represent traps.
    My largest obstacle will be the vent for the toilet, the wall behind the toilet sits directly ontop of a joist in the basement. The other nearby walls have their own complexities.

    As a diy'er I am amazed at how complex plumbing is, I do electrical work all the time with no issue.
    Hope the electricians of the world aren't insulted but IMHO plumbing requires a greater level of skill.


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  8. #8
    DIY Junior Member canyonblue77's Avatar
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    Thanks for this link!!! Best link I've seen yet for pictorially explaining some of the issues.

    Here is a nice link to Bert Polk's plumbing tips[/QUOTE]

  9. #9
    Moderator & Master Plumber hj's Avatar
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    Actually, once you get the sink and shower/tub vents correct, you probably don't need the one for the toilet.
    Licensed residential and commercial plumber

  10. #10
    DIY Junior Member canyonblue77's Avatar
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    Default Toilet Vent

    Quote Originally Posted by hj View Post
    Actually, once you get the sink and shower/tub vents correct, you probably don't need the one for the toilet.

    How can I determine whether or not the toilet vent is needed?

  11. #11
    Forum Admin, Expert Plumber Terry's Avatar
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    How can I determine whether or not the toilet vent is needed?
    On the West coast, if you ran the lav with 2", including the vent, that would "wet vent" the toilet.
    It needs to be fixtures on the same floor, which these are.



    The upper floor here wet vents the lav on the right
    The lower floor wet vents the tub/shower on the left.

  12. #12
    DIY Junior Member canyonblue77's Avatar
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    I'm about as far east as you can get...

    Terry,
    You run a great site full of valuable information, I'm sure it takes a significant effort to maintain.
    What's the best way for someone to support the continued success of your forum?

  13. #13
    Forum Admin, Expert Plumber Terry's Avatar
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    What's the best way for someone to support the continued success of your forum?
    If you find an ad interesting, clicking on it helps me.
    Sometimes I see ads on the forum and I want to click on them, but that's against the rules for me.
    It's okay when others do though.

    Also, an easy one is something like

    http://terrylove.biz/home/75-bio-cle...n-cleaner.html
    Good you have slow drains or cats in the home. It's great for a little box.

    http://terrylove.biz/home/89-longstr...-these-cd.html

    Nice if you like Surf Style music. This is my son's band.
    In November they are recording a followup to this. Eight more songs.



    The lav trap arm can be up to 42" long
    The shower trap arm can be 60"
    Last edited by Terry; 01-21-2014 at 09:20 AM.

  14. #14
    DIY Junior Member canyonblue77's Avatar
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    Something that I forgot to mention is that there is a concrete wall with a small opening that is in the basement and splits the plumbing into two sections... the waste stack and vanity are on one side and the toilet and shower on the other.
    This drawing roughly represents how I think it could be done. The opening in the concrete sits 12 inches lower than the bottom of the floor joists not too mention the 60 year old 3" hot water heat feed/return pipes in the way. There is no way I could draw all the 3 dimensional aspects but the drawing should indicate the overall horizontal and vertical runs. Pending any other advice I will take pictures of results and post. THANKS AGAIN!!!
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