complextlt
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- Joined
- Jan 2, 2015
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Your vent issue is easily solved by using an Air Admittance Valve in the drain. The picture provides a typical under-sink application. This allows "air behind water" and stops sewer gasses from re-entering the room. Since it is accessible for maintenance, it should pass inspection.
We use these in remodel situations which prevent easy connection to existing vents. Your only challenge is the drain pipe itself. Your best bet would be 2" pipe but 1 1/2" is common and typically allowed. (Remember: Many sink drains are 1 1/4" at the tail pipe so a simple plastic adapter washer that takes you from 1 1/4" to 1 1/2" is used) You will need a slope of at least 1/8" per foot from the end of the p-trap to the drain stack connection. If you are stuck with multiple 90 degree turns, a steeper slope is preferred. However, your distance to the drain stack is less than 6 feet, so I believe you are good to go.
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