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  #1  
Old 5/3/07, 1:02 PM
Eric Hyde Eric Hyde is offline
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Default Air Admittance Valves

I've been running into these plumbing vent valves a lot recently, the kind that do not require roof penetration, and I'm curious to know from some more seasoned inspectors what they think of them. Are these kind of venting valves okay under a kitchen sink or in the attic?

Here's a good picture of them.

Thanks.
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  #2  
Old 5/3/07, 4:43 PM
Jeffrey R. Pope, CMI's Avatar
Jeffrey R. Pope, CMI Jeffrey R. Pope, CMI is offline
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Default Re: Air Admittance Valves

They are a mechanical valve and, therefore, subject to failure. Check your local codes to see if they are allowed. IRC says they're okay, UPC does not recognize them.



IF YOUR INSPECTOR IS NOT USING THERMAL IMAGING, YOU'RE NOT GETTING THE WHOLE PICTURE
Jeff Pope
JPI Home Inspection Service
Santa Clarita CA
(661) 212-0738
Santa Clarita Home Inspection
http://www.MyInspector.net


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  #3  
Old 5/3/07, 7:04 PM
Marcel R. Cyr, CMI's Avatar
Marcel R. Cyr, CMI Marcel R. Cyr, CMI is offline
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Default Re: Air Admittance Valves

Quote:
Originally Posted by jpope
They are a mechanical valve and, therefore, subject to failure. Check your local codes to see if they are allowed. IRC says they're okay, UPC does not recognize them.


Jeff, you bring up a good point here.

Maine does not allow Mechanical vents as of last year. How would we address the fact of it's existance in dwellings before the Code change?

Since we are not Code Officers, how does it get addressed in the report?

Could we look at it as a Safety issue?
Point out that it is no longer accepted by the Building Plumbing Code and needs to be upgraded?

What are your thoughts on that subject?

Thanks

Marcel
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  #4  
Old 5/3/07, 7:28 PM
Jeffrey R. Pope, CMI's Avatar
Jeffrey R. Pope, CMI Jeffrey R. Pope, CMI is offline
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Default Re: Air Admittance Valves

CA does not allow them, although some local jurisdictions do. Here is one of my standards when I see these. You might be able to modify it for your state.

Quote:
The drain-waste-vent system (DWV) employs a mechanical vent, also known as an air-admittance valve or AAV. This application may have been approved by this local jurisdiction, however, you should be aware that this type of system is not recognized by California Building Officials as an approved vent system. Although they may function as intended, AAV's are a mechanical component, and as such, they are subject to failure over time. Failure of these mechanical vents may allow sewer gases to escape into the attic or living space, which would result in potentially hazardous and unhealthy conditions. If, at any time, you notice an odor consistent with waste or sewage, you should immediately contact a qualified plumber to evaluate the AAV's.
I think it's a bit of a stretch to call it as a "safety" issue, unless they are not functioning.



IF YOUR INSPECTOR IS NOT USING THERMAL IMAGING, YOU'RE NOT GETTING THE WHOLE PICTURE
Jeff Pope
JPI Home Inspection Service
Santa Clarita CA
(661) 212-0738
Santa Clarita Home Inspection
http://www.MyInspector.net


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  #5  
Old 5/3/07, 7:43 PM
Marcel R. Cyr, CMI's Avatar
Marcel R. Cyr, CMI Marcel R. Cyr, CMI is offline
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Default Re: Air Admittance Valves

Thanks Jeff, that was a lot of help.

Marcel
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  #6  
Old 5/3/07, 8:18 PM
Charley L. Bottger's Avatar
Charley L. Bottger Charley L. Bottger is offline
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Default Re: Air Admittance Valves

Just ran into my first AAV in an attic this week on a 3 inch vent set me back on my heels for a moment used to seeing them on sinks not in the attics here; darn Plumbers connot find a good one any more all they want to do is take short cuts. Maybe we should all turn the clocks back and start using outhouses again????
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  #7  
Old 5/3/07, 9:42 PM
James H. Bushart's Avatar
James H. Bushart James H. Bushart is offline
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Default Re: Air Admittance Valves

Quote:
Originally Posted by jpope
Here is one of my standards when I see these. You might be able to modify it for your state.
It may be worthy to add the smell (rotten eggs) of hydrogen sulfide, or "sewer gas" to your list of odors.

One of the problems with hydrogen sulfide is that, after a few whiffs, it will deaden the olfactory nerves (sense of smell) and while still being in high concentrations, it becomes odorless.

Hydrogen sulfide effects are also cumulative and, repeated exposures even to small levels, have been known to cause neurological damage.

The nose not always knows.
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Old 5/3/07, 9:57 PM
Jeffrey R. Pope, CMI's Avatar
Jeffrey R. Pope, CMI Jeffrey R. Pope, CMI is offline
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Default Re: Air Admittance Valves

I might just do that. Thanks James. . .



IF YOUR INSPECTOR IS NOT USING THERMAL IMAGING, YOU'RE NOT GETTING THE WHOLE PICTURE
Jeff Pope
JPI Home Inspection Service
Santa Clarita CA
(661) 212-0738
Santa Clarita Home Inspection
http://www.MyInspector.net


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  #9  
Old 5/4/07, 9:08 PM
homebild homebild is offline
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Default Re: Air Admittance Valves

It is not unusual that you should be seeing air admittance valves on plumbing vents in Oklahoma since Oklahoma has adopted the International Plumbing Code and the plumbing provisions of the International Residential Code statewide.

Both the IPC and IRC plumbing provisions allow air admittance valves on all vents except for pneumatic sewage ejectors, except on the required one 3" vent that penetrates the roof as a main vent, and where local codes restrict or forbid AAV use.

AAVs are also allowed in Maine jurisdictions and elsewhere that have adopted the IPC and IRC plumbing provisions.

To see which ICC Codes, if any your state or municipal jurisidction have adopted, click the state on the ICC map link here:

http://www.iccsafe.org/government/adoption.html

Last edited by homebild; 5/4/07 at 9:12 PM..
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  #10  
Old 5/5/07, 6:23 PM
Brian C. Hoagland Brian C. Hoagland is offline
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Default Re: Air Admittance Valves

Quote:
Originally Posted by cbottger
Just ran into my first AAV in an attic this week on a 3 inch vent set me back on my heels for a moment used to seeing them on sinks not in the attics here; darn Plumbers connot find a good one any more all they want to do is take short cuts. Maybe we should all turn the clocks back and start using outhouses again????
How much you wanna bet that valve was installed post contruction after some moron completed the roof without the penetration? May not be the plumbers fault!
</IMG>
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  #11  
Old 5/6/07, 9:10 AM
Charley L. Bottger's Avatar
Charley L. Bottger Charley L. Bottger is offline
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Default Re: Air Admittance Valves

Quote:
Originally Posted by bhoagland
How much you wanna bet that valve was installed post contruction after some moron completed the roof without the penetration? May not be the plumbers fault!
</IMG>
I will bet anything you have to loose.
The home was a 100 years in age and had been gutted in 1995 with a new bathroom installed in the original part of the home the plumber just did not want to cut a hole in the roof. Would of been very easy in that location of the roof that is why they started making hole saws and sawzalls?????
</IMG>
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  #12  
Old 5/6/07, 1:12 PM
Marcel R. Cyr, CMI's Avatar
Marcel R. Cyr, CMI Marcel R. Cyr, CMI is offline
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Default Re: Air Admittance Valves

Quote:
Originally Posted by homebild
It is not unusual that you should be seeing air admittance valves on plumbing vents in Oklahoma since Oklahoma has adopted the International Plumbing Code and the plumbing provisions of the International Residential Code statewide.

Both the IPC and IRC plumbing provisions allow air admittance valves on all vents except for pneumatic sewage ejectors, except on the required one 3" vent that penetrates the roof as a main vent, and where local codes restrict or forbid AAV use.

AAVs are also allowed in Maine jurisdictions and elsewhere that have adopted the IPC and IRC plumbing provisions.

To see which ICC Codes, if any your state or municipal jurisidction have adopted, click the state on the ICC map link here:

http://www.iccsafe.org/government/adoption.html




Back to Codes


StateIPCIRCUPCNSPC
Approval Status


as of 8/ 2006


AlabamaXX
Approved


AlaskaX
Not approved


ArizonaX
Approved


ArkansasX
Approved


CaliforniaX
Partial approval


ColoradoXX
Approved


ConnecticutX
Approved


DelawareXX
Approved


D.C.XX
Approved


FloridaX
Approved


GeorgiaXX
Approved


HawaiiX
Not approved


IdahoX
Not approved


Illinois
Not approved


IndianaXX
Approved


IowaX
Not approved


KansasXX
Partial approval


Kentucky
Not approved


Louisiana
Not approved


MaineXX
Partial approval


MarylandX
Approved appendix "E"
2005 edition


Massachusetts
Not approved


MichiganXX
Approved


Minnesota
Not Approved


MississippiXX
Approved


MissouriX
Partial approval


MontanaX
Not approved


NebraskaXX
Not approved


NevadaX
Partial approval


New HampshireX
Approved


New JerseyX
Approved appendix "E"
2005 edition


New MexicoX
Not approved


New YorkXX
Approved except NYC


North CarolinaXX
Approved


North DakotaX
Not approved


OhioX
Approved


OklahomaX
Approved


OregonX
Not approved


PennsylvaniaXX
Approved except
Philadelphia


Rhode IslandXX
Approved


South CarolinaXX
Approved


South DakotaX
Partial approval


TennesseeX
Approved


TexasXXX
Partial approval


UtahXX
Approved


VermontX
Approved


VirginiaXX
Approved


WashingtonX
Partial approval


West VirginiaXX
Approved


WinconsinX
Approved


WyomingXX
Not approved


IPC=Internatinal Plumbing Code IRC=International Residential CodeUPC=Uniform Plumbing Code NSPC=National Standard Plumbing Code

<DIV class=printhide id=u52 style="Z-INDEX: 1000; LEFT: 0px; POSITION: absolute; TOP: 0px">
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  #13  
Old 5/7/07, 9:13 PM
homebild homebild is offline
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Default Re: Air Admittance Valves

Right, Marcel

AAVs are permitted in Maine jurisdictions but ONLY where they are approved by Code..

Both Studor (only one such manufacturer of AAVs) and the ICC Plumbing Codes acknowledge this...

Whether or not AAVs can be used in Maine depends entirely on the municipality involved.
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  #14  
Old 5/7/07, 9:35 PM
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Peter C. Russell Peter C. Russell is offline
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Default Re: Air Admittance Valves

AAVs IMO are great for older homes, but do have their draw backs due to failure, but if that's the only way to vent a sink what are you going to do?

I point them out and educate my client on their limitations and put that into the report. I see nothing wrong with them, I have one in my house.
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