I am planning a kitchen remodel in which I will move the sink/dishwasher from the wall to an island about 10' from the current 2" stack in the wall. I also have a 2" iron stack running from my second floor showers through my kitchen to the basement (currently enclosed in a column that will run through the new island). I originally thought I could drain/vent the new sink through this 2" stack, but it sounds like I can't because this is a "wet" pipe and cannot also be used as a vent.
It seems that I could use the 2" stack inside the column to drain the new sink, but I will then have to run a revent up through the second floor to somewhere above the shower. Or, I could loop vent the new kitchen sink back to its original stack in the kitchen wall. The loop vent seems easier...
My question then, is there a maximum distance that I can loop vent from the new island sink to the existing kitchen drain stack? Is 10'-13' to far?
Sounds like you have a good understanding of how plumbing works. Cutting into the 2" sounds fine and then vent as you are suggesting or perhaps you could use a PROVENT. A provent (or AAV) is not legal in all states so check your local codes, but if acceptable this mechanical vent simply screws into the pipe just above the trap.. see image. Although not ideal, that would take care of the venting pretty easy.
Otherwise, please describe how you plan to get the vent relooped back to the old vent... curious how you plan that as this is an island sink..? I understand the vent going upstairs and connecting in at 6 inches above the flood level of the SINK (not the shower), but how can you revent by looping back? Let me know... OK?
Thanks massplumber and speedball,
I've read your comments on similar posts and appreciate your expertise.
To answer your question, massplumber:
Otherwise, please describe how you plan to get the vent relooped back to the old vent... curious how you plan that as this is an island sink..?
I had planned to run the vent and drain into the basement, then into the stack from the current kitchen sink, closing off the current sink's tee and using the whole stack only as the vent/drain for the island, as I found online in this tutorial... Black & Decker Power Tools
However, in another post, Milo (the California plumber) said it violates code because the vent connects below the overflow level of the sink. Is this true? If so, I could try to send the vent up higher into that wall to connect to my current kitchen stack above the overflow level.
I'll tell you, I have a few different ways to do this. One is very much like Tom's (see image) and another is closer to black and deckers' version (click on massislandvent2.pdf, below left). I can present a couple other ways, too...
Since you really seem willing to do this job according to best practices/priciples I would suggest that you find out exactly how they pipe an island sink up in your area.
If you cap off the old kitchen sink and use the old stack as a vent stack then it sounds to me like you meet the 6 inches above flood level rim requirement that Milo talked about... as long as nothing above this old vent... right?
Anyway, maybe if you tell us what code you fall under we can give better info... maybe? Otherwise, you should be able to find the info. Online via Google
Thanks again Mark. I live in the Saint Louis, MO, area.
In my last house, I did quite a bit of "creative" DIY plumbing, but we plan on being in this one for a while, so I'd like to do things right.
I adapted your picture to reflect my plans:
This pretty much follows the Black and Decker suggestions. Let me know if you see any problems. Are you saying that even though the vent hits the stack in the basement its OK because nothing else drains above it? I thought maybe I needed to take my foot vent up into the kitchen wall and attach it to the stack above the flood level of the island sink. Alternatively, I thought maybe I could use the 2" shower stack to drain and the old kitchen sink line to vent? Would that change anything?
Beardz, you don't need to run the vent pipe up inside the wall as the vent is already above the flood level rim of the sink... heck, it goes up to the 2nd floor or higher... right? Think of it in terms of the old sink... the vent just continued up right as it is now... same applies here.
If, as an example, you wanted to reconnect the old sink and still install a sink in the island then you would have to open up the wall and take the island sink vent and connect that 6" above the flood level rim of the old sink. Hopefully, that clears that up...
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