Kitchen Sink loop vent in wall above sink flood level w/ connection to main stack below flood level

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Richard978

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Hi guys,

I am looking to vent a kitchen sink that doesn't have easy access to the existing vent system. I understand diagram B in the attached image is code for a loop vent as they are typically used in kitchen island where the loop is directly below the counter. In my situation the loop vent would be in a wall and could go above the sink's flood elevation. My question is would the system in diagram A be acceptable as the loop is above the flood elevation at the sink but the actual vent connection to existing main stack is below in the basement?
 

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wwhitney

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Other than the issue Terry cited, either A or B would be fine for a loop vent. The connection from vent to drain occurs at the low point of the vent; after that point, the vent just has to follow the usual vent rules (other than the height of the horizontal segment), so it can rise up before hitting the main stack.

But the main question is whether you can get approval for a loop vent for a sink that isn't on an island. Lack of easy access may not be sufficient justification for the loop vent; you may have to just do it the normal, hard way.

Cheers, Wayne
 

Richard978

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Good catch. Yes, the wye would go in the flow direction. Opposite of what I drew. Thank you!
 
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