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Old 02-25-2012, 09:38 PM   #1
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Powder room venting

Hi all,

I live in an old house with a single bath on the main floor. I think the plumbing was last updated in the mid-70s. I would like to install a powder room on the second storey. The main stack does not run up through the roof; it stops in the basement and is vented out the side of the foundation. I have attached an annotated photo in hopes that someone can help me out. My plan was to cut in below the kitchen sink pipe and add a 'y' fitting for a 3" pipe that would go up through the floor and make two 90 degree turns before arriving at the flange. From the flange there would be a 3' horizontal run, a 90 degree elbow and a 10 ft or so vertical run, then a 45 degree elbow to the main pipe. I tried to show this in my photo. I thought to us a Studor type Air Admittance Valve, as I believe this is allowed with toilets in my area. Is this possible? Do I need another vent? Have I got too many bends? Thanks a lot for your expertise.
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Powder room venting-2nd_toilet_diagram_3.jpg  


Last edited by mjordan76; 02-25-2012 at 09:48 PM.
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Old 02-25-2012, 09:47 PM   #2
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You will need to vent the new fixtures at the top floor.
I won't ask why there is a 3" vent thru the foundation- it's not right
Do you know what code is used in your town?


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Old 02-25-2012, 10:14 PM   #3
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yes agree with e plumber..you will need to vent on top floor....not sure about aav on a commode...don't seem right but then again neither is that 3" vent out the side of house....adding pr is ok ..just up grade plumbing to someones code...ben
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Old 02-26-2012, 08:19 AM   #4
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here they allow aav on toilets as long as you have one vent going to the out side

just click on the different codes at bottom to read all aav codes

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