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Old 02-05-2016, 09:04 PM   #1
jkk
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Venting kitchen sink under window


My kitchen sink sits under a wide window. Receptacle boxes under window are 41" from floor, to bottom of window. With countertop height being 36", there's not way I can get the vent height to meet the 6" higher than sink requirement. I would think this is a common dilemma for sinks under windows. Other than using an AAV, which I'd rather not, are there other options?

My other problem is running the 1/5" vent up through double plate in a house with no eave. Getting a 22.5 or 45, in the attic, at top of that vertical vent pipe just above the double wall plate, seems like a job for a contortionist ...
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Old 02-05-2016, 09:10 PM   #2
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Vent pipe for kitchen sink has a sweep 90 above the sink, goes a few feet, then another sweep 90 takes it up towards the roof, where it has another 90 then travels a few feet before another 90 takes it up through the roof.

That not work?
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Old 02-05-2016, 09:12 PM   #3
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Run the vent and drain up the side, next to the window and run a horizontal trap arm to the sink location. At the plate line, drill up through the roof to vent the sink by itself.
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Old 02-05-2016, 09:15 PM   #4
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I had the exact same issue when I built my house. I put a provent under the windowsill. I put it in so that if I ever had to change it all I had to do was pull the windowsill out and I could unscrew it and screw in a new one. That was 25 years ago. I have never had any issues.
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Old 02-05-2016, 09:16 PM   #5
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Picture would be great.
"1/5 vent" Guess you mean 1-1/2" vent.
An AAV does not need to be higher then the sink.
What is it your doing that makes you ask the question?
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Old 02-05-2016, 09:34 PM   #6
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Quote:
Originally Posted by joecaption View Post
"1/5 vent" Guess you mean 1-1/2" vent.

What is it your doing that makes you ask the question?
Yes, 1.5". I think i was confusing the situation where you join an existing vent, where the joint needs to be above flood plane. Since there is no ven yer, i guess i can use a tee at drain connection, go vertical a little bit and the run over to side
of window. My mistake.

The hard part is accessing the area above the plate. Very little room there.
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