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Old 10-13-2009, 07:54 PM   #1
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Need help re-routing kitchen sink vent


Hello,

I'm about to embark on a kitchen reno where I will replace all the kitchen cabinetry, update electrical to latest code, and tie into existing plumbing. I (admittedly) have little experience in plumbing, but this isn't a very big job.

The new sink is going in the same exact location. My problem is twofold:
-currently, the vent runs to the left across three cabinets, where it connects in the wall to the stack. This uses up valuable storage space
-the wall directly behind the sink is an outside wall.

I want to re-route the vent. My questions are:
-The way the sink is vented now -- is this the correct way to do it? Do you see any problems with the existing work?
-Can I run the vent on the outside wall without worry of frost closing? This will be done in order to connect the vent to the vertical stack in an adjacent interior partition wall.
-Any special considerations? I understand that the vent has to be 1/4" rise for every 12" run. Is it acceptable to run this pipe (2.25"???) through a structural (exterior) wall?
-As an alternative, could I not just do the "kitchen island sink loop" vent? That way the vent will go down and connect to the stack via the basement?
-Should I just run it, in a cleaner manner, across the three new cabinets instead, and save myself the headache?


Thanks!!!
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Old 10-13-2009, 08:02 PM   #2
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Need help re-routing kitchen sink vent


Vent can be put into outside walls.Kind of a knuckle buster of a job though.

Do you have a soffit? Drill past the window-then up an open stud bay to the soffit?

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Old 10-13-2009, 08:06 PM   #3
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Vent can be put into outside walls.Kind of a knuckle buster of a job though.

Do you have a soffit? Drill past the window-then up an open stud bay to the soffit?
Yeah I suppose I could do that, but I live in Canada -- we require 3" for vent stack exits to exterior in order to prevent frost closure. And I REALLY dont want to make a new stack.
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Old 10-13-2009, 11:16 PM   #4
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Need help re-routing kitchen sink vent


That vent is incorrect anyway. It should rise to at least 6" above the flood level rim of your sink before it makes a horizontal offset.
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Old 10-20-2009, 09:44 PM   #5
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That vent is incorrect anyway. It should rise to at least 6" above the flood level rim of your sink before it makes a horizontal offset.
Are you sure that applies in this situation? I dont see how any sink could accomodate a 6" vent riser before horizontal.
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Old 10-20-2009, 09:49 PM   #6
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It would have to go in the wall

Also get rid of that trap set up it looks to me like a "S" trap
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Old 10-21-2009, 05:44 AM   #7
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another board suggested I replace the wye with a sanitary tee. so the p-trap would come on on the horizontal of the tee, and the vent would feed up. I hope this well meet code requirements.

I will draw up a new diagram for a plumbing plan and have you guys review. Thanks!
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Old 10-21-2009, 06:20 AM   #8
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Wow i have never seen anything like that.
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Old 10-21-2009, 09:08 PM   #9
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Yes I am absolutely sure it applies in your situation. The drain should come up inside the wall, a tee installed going into the cabinet under the sink, a vent rising out of the top of the tee then proceeding where need be to get it either out the roof or tied into a vent stack or stack vent. A horizontal offset can be installed after the vent rises at least 6" above the flood level rim of the receiving receptacle...in your case, the sink.
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Old 10-21-2009, 10:26 PM   #10
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Yes I am absolutely sure it applies in your situation. The drain should come up inside the wall, a tee installed going into the cabinet under the sink, a vent rising out of the top of the tee then proceeding where need be to get it either out the roof or tied into a vent stack or stack vent. A horizontal offset can be installed after the vent rises at least 6" above the flood level rim of the receiving receptacle...in your case, the sink.
Gotcha, thank you. So there's no choice but to run the vent inside the wall.

I don't think I'll be able to put the drain inside the wall as it is an outside wall and the block/mortar foundation is in the way. Are there any alternatives?

The vent -- i could probably accomodate running inside the wall, but i'm worried about the drain according to what you're saying.
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Old 10-22-2009, 10:47 PM   #11
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Need help re-routing kitchen sink vent


You can come up through the floor into the cabinet, throw off your tee for the sink then 45 out of the top of the tee to get into the wall. Anything greater than a 45 degree angle is considered a horizontal offset. I'd try to get the drain as close as possible to the back wall so you can make the 45 degree offset with a little more ease.
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Old 10-23-2009, 03:17 PM   #12
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Not sure this is code complient but what about an AVV vent or power vent that can be put under the sink?

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