Air Admittance Valve Placement

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  #1  
Old 12-21-13, 11:52 AM
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Air Admittance Valve Placement

Why can't I install valves below the trap of a drain? I'm installing a few air admittance valves on some drain lines that are way too far from he soil stack. The instructions indicate that you have to put the valve right after the trap and at least 6 inches higher than the trap.

The areas I'm putting these are pretty tight and without a lot of room to install a 6" high valve. I'm trying to find a reason why I can't just install the valve at some other part on the line in an easy-to-access location below the trap? I have several locations of the drain pipe that are nearly horizontal (they obviously are tilted downward) that would be ideal to put such a valve.

The only reason I can guess is in case it gets clogged and would start draining out of the valve. But this would be highly unlikely to happen based on how my drain lines are situated. Any and all help is appreciated from anyone. Thanks
 
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Old 12-21-13, 12:34 PM
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Why can't I install valves below the trap of a drain?
Because thats the rules... Thats what code dictates. You cannot have the vent below the trap weir period...

some drain lines that are way too far from he soil stack.
What does that mean? You would not tie the vent back into the soil stack unless its 3ft above the flood plane of the highest fixture in the house...

Most likely ties into the attic to the stack, or through the roof....


The only reason I can guess is in case it gets clogged and would start draining out of the valve.
You can guess and would seem logical but thats not the case.


 
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Old 12-21-13, 12:37 PM
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Old 12-22-13, 06:36 AM
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Thanks for your response and graphics!
 
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Old 12-22-13, 06:50 AM
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I hope it works out for you....

Good luck.
 
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