Additional Vent Stack Required?

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canyonblue77

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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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Cacher_Chick

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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.
 

hj

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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.
 
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canyonblue77

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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!PlumbPlan2.gif
 

canyonblue77

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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.


PlumbPlan5.png
 

Terry

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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.

dwv_b1.jpg


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

canyonblue77

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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?
 

Terry

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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

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Good you have slow drains or cats in the home. It's great for a little box.

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canyonblue_dwv.jpg


The lav trap arm can be up to 42" long
The shower trap arm can be 60"
 
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canyonblue77

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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!!!
HandDrawn2.jpg
 
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