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Author:
DIYinMO (MO)
In my 1 1/2 story upstairs bath, I need to run the WC drain about 5' back behind a knee wall to the first floor wall in order to drop into the crawl space and connect to the main horizontal drain line. Can I add a 2" wye inlet vertical in the knee wall in order to 1) drain the lab without boring floor joists, and 2) start a vent stack that accumulates all the aux vent lines before rising through the roof? Would this be an illegal short connection to an offset soil stack, or is it just a vented branch connection that drops past the first floor to connect with the building drain line? I'm under 2006 IRC.
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Author:
packy (MA)
my code says the "Y" that you propose can be a maximum of 20 inches below the toilet outlet.
so, yes you can put a "Y" in the vertical stack as long as you keep within the 20 inch limit.
and yes you can tie other vents into that new vent stack as long as they are connected 6 inches higher than the over flow of the highest fixture that stack serves..
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Author:
hj (AZ)
If I understand how you want to connect the lavatory, you CANNOT use a "Y" unless you also add a vent to the drain line. What do you mean by "start a vent"?
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Author:
DIYinMO (MO)
HJ, here's a photo of the toilet flange and my proposed connections to the same 3" drain. [s1153.photo bucket.com]
At the tee low on that 2" vertical pipe, I'd like to connect my lav drain. Above that is a cross for vents ( including the vent from the same lav) to enter. The vertical 2" pipe is connected below the subfloor to the WC 3" drain via a 3-3-2 wye combo with its 2" inlet turned vertical. I'd like to extend this 2" stack through the roof.
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Author:
North Carolina Plumber (NC)
I'd like to see the picture, but it does sound like what you are planning would be code compliant.
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Author:
DIYinMO (MO)
Photo link works very slowly for me--maybe it's a plumbing issue too!
Here's a link to my Photobucket folder: [s1153.photobucket.com]
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Author:
North Carolina Plumber (NC)
Looks good, depending on the distance from the 2" vent to the lavatory, you may not even need the relief vent that you have drawn in for the lavatory.
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Author:
packy (MA)
how high off the floor is the san tee for the lav?
should be at least 18". you can not elevate the trap higher than the tee..
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Author:
DIYinMO (MO)
The lav will be against a wall perpendicular to the knee wall which the WC backs up to. That lower tee is set for slope after the lav trap arm connects to its own vent (which comes back to the inverted cross tee above).
What concerned me is that I read somewhere "never connect a branch or fixture within 2 feet of an offset." Is the 3" WC drain running horizontally to the back wall (another 5' past this 2" vertical) considered an "offset"?
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Author:
packy (MA)
the vertical stack going down is 'offset' from the toilet connection riser.
your 'Y' is connected in the middle of the offset.
BTW, i have never heard that. however, there is something about connecting too close to the base of a stack.
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Author:
bernabeu (SC)
'google' suds pressure zone
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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
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