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Author:
Lookin4Answers (CA)
I am trying to add a shower drain to an existing line. I am wondering if the following will be within code in California and actually work?
This is the current set-up:
It was a vanity with two sinks. The drain (2 inch) goes straight down and the vent (1-1/2 inch) goes straight up:
[s24.photobucket.com]
This is what I would like to do:
Red = 2" Shower drain, connected with a 2 x 2 x 2 wye.
Green = 2" Wet vent
Yellow = 1-1/2" Vanity drain, connected with a 2 x 1-1/2 x 1-1/2 T.
Blue = 1-1/2" vent to roof
[s24.photobucket.com]
I am getting rid of the other vanity drain on the right side.
Any help is appreciated.
Edited 4 times.
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Author:
packy (MA)
my code does not allow the vent to be reduced to 1 1/2..
must stay full size thru the roof.
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Author:
Lookin4Answers (CA)
Is that because I'm linking 2 things to one vent (vanity and shower)?
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Author:
steve (CA)
California code doesn't state it can't be reduced. It states the dry vent section is sized
per Table 702.1 and 703.2 and those Tables allow for 1½" dry vent.
Scroll down to Section 908.0 and look at 908.1, 908.1.1, 908.1.2, 908.2, 908.2.1 and 908.2.2., for wet vent requirements.
[www.iapmo.org]
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Author:
hj (AZ)
we use a 1 1/2" vent all the time. It has been decades since I have installed a 2" vent on a lavatory or shower, But, if I am reading the picture correctly you CANNOT connect the shower with a "Y".
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Author:
packy (MA)
steve, that is why i qualified my response by saying "my code"...
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Author:
hj (AZ)
But, the person does NOT know if "your code" applies to him, which is why we add qualifiers.
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Author:
North Carolina Plumber (NC)
As long as it's not being used to vent the toilet , 1 1/2" is fine here in NC.
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Author:
m & m (MD)
The existing lav drain is connected to the stack by a combination Y & 1/8th, not a sanitary tee as code ("my code"] requires.
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Author:
steve (CA)
As m & m stated, a double combo tee was used(wrongly by CA code) in the wall and you need to install a sanitary tee when you change the drain for the single sink.
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Author:
Lookin4Answers (CA)
Thank you everyone for your helpful information. After reviewing the responses please clarify if this sounds right. I can maintain the 1-1/2 inch vent, but I will maintain the 2 inch wet vent. I will connect the shower and lavatory drains using a sanitary tee?
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Author:
steve (CA)
If the shower trap arm is attaching to a vertical drain pipe, then yes to the sanitary tee. And yes to the 1½" dry vent and sanitary tee for the sink.
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Author:
Lookin4Answers (CA)
Thank you so much.
Edited 1 times.
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Author:
hj (AZ)
The connection can be a sanitary tee, Y and 1/8 bend, or combo as long as the lavatory is vented and not using the stack it is connected to as the vent.
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Author:
hj (AZ)
The photo is at the wrong angle and too far away to diferentiate between a double combo or a back to back fixture fitting, but it is immaterial since he is removing the second sink and can easily change it to a sanitary tee when he makes the shower connection.
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