AAV Placement Confusion

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Old 09-25-09, 06:53 PM
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AAV Placement Confusion

Hello.

Remodeling a bathroom. Im confused about the placement of an air admittance valve. Here is the drawing I made of my plumbing layout.

http://i302.photobucket.com/albums/n...0/scan0001.jpg

As you can see I have two options. Vent in the dry line above the sink or vent in the wet line between the tub and sink. I have a Black and Decker plumbing book that shows a picture of an AAV between two fixtures in a basement in the wet line with the fixtures above the AAV.
 
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Old 09-26-09, 07:28 AM
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The correct link is...

http://i302.photobucket.com/albums/n...scan0001-1.jpg

The link in the first post was edited.
 
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Old 09-26-09, 12:02 PM
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Unhappy Aav

If your diagram is close to what is actually there, why don't you run a real vent?, do you realize that AAVS' are mechanical devices that have to be exposed and they also can go bad?

I would never use one unless there was no possible way to install a real vent, your call.
 
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Old 09-26-09, 01:48 PM
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How would I go about running a regular vent in this situation?

Like this?

http://i302.photobucket.com/albums/n...0/scan0002.jpg
 
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Old 09-27-09, 12:12 PM
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Smile Vent

I would run your 2in line to the tub area and take a 2in wye off before the trap, run the branch of the wye up for you sink, when you get thru the floor, add a clean-out, reduce to 1 1/2 for the sink, continue up and over and tie into your stack.
 
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Old 09-27-09, 03:06 PM
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Old 09-27-09, 11:56 PM
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Yeah, Like that. You don't NEED the second cleanout, but it would never hurt!
 
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