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Old 07-04-2012, 10:53 PM   #16
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S to P trap convert


air gap needed

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Old 07-04-2012, 10:59 PM   #17
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?...never used a AAV trying to picture installing one that would be above F L R and be accessible without being buried in the wall
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Old 07-05-2012, 12:04 AM   #18
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air gap needed
Or high loop, if allowed by AHJ.

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Old 07-05-2012, 12:19 AM   #19
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Vent requirement for laundry washer drain pipe

Here's a post from a few years back on the forum that has a pretty good drawing & discussion concerning AAVs. One thing I don't like about them is that since they are a mechanical device they are therefore prone to failure more often than a conventional vent.
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Old 07-05-2012, 12:36 AM   #20
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Or high loop, if allowed by AHJ.

key words if allowed by AHJ.
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Old 07-05-2012, 05:19 AM   #21
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When the AAV is lower than the flood rim of the sink then water will overflow through it first, leading to a leak you won't seek at the sink first.
This is true but that will only happen if the drain is clogged down stream from the trap.

Realizing that it is not code compliant, I have seen plenty of AAVs installed below sinks and they work fine. Very common in sinks located in kitchen islands or peninsulas.

Not all codes require an air gap for the DW.
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Old 07-05-2012, 07:12 AM   #22
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When the AAV is lower than the flood rim of the sink then water will overflow through it first, leading to a leak you won't seek at the sink first.
so what about kitchen island situations how can you ever have an AAV above and flood rim in any island install? SO I guess the AAV as high a possible and a 2" drain will be my only option? would it help to put in a 2.5" drain ?
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Old 07-05-2012, 07:58 AM   #23
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so what about kitchen island situations how can you ever have an AAV above and flood rim in any island install? SO I guess the AAV as high a possible and a 2" drain will be my only option? would it help to put in a 2.5" drain ?
For a island or peninsula sink drain without an AAV, you use a "Siamese vent".

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Old 07-05-2012, 08:38 AM   #24
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thanks for that input, sorry again I have been asking questions based on my knowledge and now I see my situation more clearly... there is no vent on anything on the 1st floor. I have a drawing of what I currently have- there is no vent for anything on the 1st floor. the sink drains ok sucks at the end but is not slow.

There is a vent for the 2nd floor bath that services the sink/toilet/tub but there is no way to tie in to that you'll have to trust me the vent is above the bath which is an addition onto a 100 yr old house than had and outhouse originally.

It's a plumbers job I know but I am trying to DIY -- I wonder if I could :

#1 put a vent out the wall and up along the outside of the house

#2 put an AAV inside the wall behind the sink

the house is a balloon frame but there are fire blocks on some so it is not always easy to go up and behind the new sink area is fire blocked -- am I whistling dixie here ?

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Old 07-05-2012, 08:49 AM   #25
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$1 You could install an outside stack but it will look like hell. Check with the AHJ before you do.

#2 An AAV can be installed in the wall but it needs to be accessible for maintenance. Use a return air grill or an access panel.
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Old 07-05-2012, 09:09 AM   #26
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I"ll have to check to see if AAV is allowed, Studor site says they are legal in PA

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