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Old 10-09-2012, 06:36 PM   #1
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Vent stack for 3x sinks


Hi all,

From what I learned in the other thread about our toilet, I am going to assume that the following is NOT ok, due to one of the sinks being over 6' from where the vent stack is currently located?

Is my only option to give that solitary sink by the toilet it's own vent stack?
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Old 10-09-2012, 08:54 PM   #2
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Vent stack for 3x sinks


that would work fine. the 2 sinks together could use the same drain. where is the vent for the toilet? if close enough the single sink vent can vent the toilet also.

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Old 10-09-2012, 09:00 PM   #3
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Vent stack for 3x sinks


depending on your governing code, you can go 8 feet on a 2 inch waste arm and depending on how the complete bathroom is vented you could vent all three sinks on a single stack, again your code permitting.
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Old 10-09-2012, 09:23 PM   #4
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Vent stack for 3x sinks


They don't have to be within 6 feet of a vent stack, they have to have their own vent within "X distance" My version of UPC on a 2" line is 5 feet, and 1-1/2" line is 3.5 feet.


Hold on, more drawings coming up.......
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Old 10-09-2012, 09:29 PM   #5
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Vent stack for 3x sinks


On the left is an example of the trap arm being run horizontally in the wall for a lav or a kitchen. That has to meet the minimum distance from trap weir to vent. IE 5 feet for 2" or 3.5 feet for 1.5"


On the right is an example of a vent below the floor for a shower (similar to one of the toilet drawings I put in the other thread) Same rules apply there.
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Old 10-09-2012, 10:01 PM   #6
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Vent stack for 3x sinks


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Originally Posted by weekendwarrior9 View Post
Hi all,

From what I learned in the other thread about our toilet, I am going to assume that the following is NOT ok, due to one of the sinks being over 6' from where the vent stack is currently located?

Is my only option to give that solitary sink by the toilet it's own vent stack?
Ya know Mr. Warrior,
You have asked how to vent a toilet, shower and lavs. You've received answers from several plumbers from across the country- all using different codes.
Where are you located? Do you know your governing code? Is this a single story or are you using lower level vent stacks to drain into?
Give us a drawing showing your existing plumbing and I'm sure one of us will draw something for you
Allen likes to draw
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Old 10-09-2012, 10:05 PM   #7
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Vent stack for 3x sinks


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Old 10-10-2012, 12:12 AM   #8
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Vent stack for 3x sinks


Sorry, I didn't want to confuse a single thread with multiple different questions.

I live in California. We are on California Plumbing Code 2010 (UPC 2009).

It is a single story dwelling, perimeter foundation.

No existing plumbing, everything was ripped out by previous owners, or by us as we came through and replaced the badly damaged walls. Only thing left are various holes in the subfloor, and the location of where I need the main sewer tie-in to be.

I really appreciate the help, trying to learn as I go here. Trying to understand the principals behind the answers ya'll are giving so I can apply to similar scenarios.
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Old 10-10-2012, 12:15 AM   #9
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Vent stack for 3x sinks


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On the left is an example of the trap arm being run horizontally in the wall for a lav or a kitchen. That has to meet the minimum distance from trap weir to vent. IE 5 feet for 2" or 3.5 feet for 1.5"


On the right is an example of a vent below the floor for a shower (similar to one of the toilet drawings I put in the other thread) Same rules apply there.
I see. And I presume that the 5' is the total run of the pipe, so 2 feet through one wall, then 90deg turn, then 3 feet in the next wall to meet up by the 5 foot limit?
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Old 10-10-2012, 08:09 PM   #10
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Vent stack for 3x sinks


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I see. And I presume that the 5' is the total run of the pipe, so 2 feet through one wall, then 90deg turn, then 3 feet in the next wall to meet up by the 5 foot limit?
True, but then you're talking 2 x 90 degree turns, and that isn't really allowed. It's referred to as "dirty arming" and one 90 degree turn is all that's allowed on a trap arm less than 3"
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Old 10-10-2012, 08:11 PM   #11
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Vent stack for 3x sinks


In otherwords, your original drawing looks just fine to me, i was simply trying to explain the distance rule.



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