AAV on "S" Trap

[Kenneth Blair]

Are AAV's allowed with S traps. In this installation the AAV does not have the minimum 4" clearance above the crown of the trap but I was just wondering if they are allowed on S traps in most areas.

[Brian A. MacNeish]

Originally Posted by kblair1

Are AAV's allowed with S traps. In this installation the AAV does not have the minimum 4" clearance above the crown of the trap but I was just wondering if they are allowed on S traps in most areas.

Not allowed in Canada unless by some local inspectors.

[Jeffrey R. Pope]

The question should be - "are AAV's allowed" - period. The S-trap is wrong, regardless of the vent system used.

Many jurisdictions do not allow AAV's, so you'll have to check with your AHJ. If so, then it should be at a higher elevation under the sink.

That whole drain line configuration is a mess, I'd defer the entire thing for correction.

[Jeffrey R. Jonas]

Would have been cheaper and easier to do it the right way to begin with!

[agallatin]

AAVs are allowed here but only in applications where stacks aren't possible . Such as a sink in a kitchen island , that would be the most likely . Yes the job in the pics is a mess .

[Marcel R. Cyr]

Jeff is right, the s-trap is illegal and the studor vent is only allowed in certain areas. Here in Maine this whole abortion is illegal.

[Brian A. MacNeish]

Originally Posted by agallatin

AAVs are allowed here but only in applications where stacks aren't possible . Such as a sink in a kitchen island , that would be the most likely . Yes the job in the pics is a mess .

No need to use AAV in an island sink.

http://www.familyhandyman.com/DIY-Pr...an-island-sink

[Marcel R. Cyr]

Brian, help in lieu of suspense to help the guy.

[James R. Szczesny]

Nice pic Marcel,

[Brian A. MacNeish]

Originally Posted by mcyr

Brian, help in lieu of suspense to help the guy.

Attachment 41916

Didn't the picture from the article come through on your system? If it did then I don't understand your comment.

When you get into the article the picture actually blows up very well!

[Gary Mohel]

Can an AAV be used in a crawl space on a pier and beam house?

[Dustin Racine]

here (alberta) u can only use aav's or "cheater vents" 1)on a island, 2)where theres a serious chance of freeze up on a vent terminating to open air or 3) where installing a true vent is not practible (assuming if u had to start opening walls to tie vent in above "flood level rim" of fixture on above floor). Not word for word out of the code, but thats my interpretation.Also, cheater vents should be piped as high as possible under cabinets for best results, "T" fittings are not allowed in drainage applications, and as u said there's also a "s-trap" That drain should be ripped out and redone.

[John Allingham]

Originally Posted by Brian A. MacNeish

Not allowed in Canada unless by some local inspectors.

Brian
What province are you in. It's my understanding that they are allowed in Ontario...saw our friend Mike Holmes install one on one of his shows.

[Marcel R. Cyr]

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i can't speak for the ontario code but while it hasn't been approved for use in canada, stores are allowed to sell them.

as long as it is installed as close as possible to the trap, accessible, and as high as possible for the fixture it serves (ie; under the counter), you shouldn't have any problems.

if it's installed properly, when the water is discharged or drained from the fixture you should be able to hear it sucking in air.

Another post says;


They are legal in Canada, but with restrictions. The main one being the vent must be of the "approved type" ie. Studor AAV, Oatey SureVent, etc.


Section 2.5.9 of the National Plumbing Code of Canada covers this.

Here's the entry from the code book (I love my scanner!)



2.5.9. Air Admittance Valves
(See A-2.2.10.16.(1) in Appendix A.)

2.5.9.1. Air Admittance Valve as a Vent Terminal

1) Individual vents may terminate with a connection to an air admittance valve as provided in Articles 2.5.9.2. and 2.5.9.3. (See also Sentence 2.2.10.16.(1).)

2.5.9.2. Air Admittance Valves

1) Air admittance valves shall only be used to vent
a)fixtures located in island counters,
b)fixtures that may be affected by frost closure of the vent due to local climatic conditions,
c)fixtures in one- and two-family dwellings undergoing renovation, or
d)installations where connection to a vent may not be practical.

2) Air admittance valves shall be located
a)not less than 100 mm above the horizontal branch drain or fixture drain being vented,
b)within the maximum developed length permitted for the vent, and
c)not less than 150 mm above insulation materials.

2.5.9.3. Installation Conditions

1) Air admittance valves shall not be installed in supply or return air plenums, or in locations where they may be exposed to freezing temperatures.

2) Air admittance valves shall be installed in accordance with the manufacturer`s installation instructions.

3) Air admittance valves shall be rated for the size of vent pipe to which they are connected.

4) Installed air admittance valves shall be
a)accessible, and
b)located in a space that allows air to enter the valve.

5) Every drainage system shall have one vent that terminates to the outdoors in conformance with Sentence 2.5.6.2.(1).

[John Allingham]

Looks like they have to be installed in the horizontal part of the drain also, pretty much eliminating them from use on an S-trap.

7.5.9.2. Air Admittance Valves

(1)

Air admittance valves shall only be used to vent,

(a)

fixtures in buildings undergoing renovation, and

(b) installations where connection to a

vent may not be practical.

(2)

The air admittance valves shall be located,

(a) above the

flood level rim of the fixture it serves,

(b) within the maximum

developed length permitted for the vent,

(c) not less than 150 mm above insulation materials, and
(d) installed in a location not subject to back pressure.

(3)

Air admittance valves shall,

(a) only vent

fixtures located on the same storey, and

(b) be connected to the horizontal

fixture drain.