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lothia 04-29-2013 09:03 PM

Peninsula Sink removing Pony wall becomes Island Plumbing?
I apologize to ask just another kitchen plumbing question, however after searching a long time for what I am trying to accomplish, the most similar results I have found have been on this site (here), in that all of the plumbing is in the sink box.

To start, the basics:
I live in Seattle WA in a midrise building, the stack is roughly 4 feet from the sink, the sink will be a 27" single bowl sink. The only cabinet box between the stack and the sink is a 15" wide 4 drawer box, there is a chance I can reduce the drawer sizes to allow 3-4" of space behind one if need be.

Currently the sink and dishwasher are at the end of a peninsula, there is a 7" wide pony wall behind them that goes up roughly 42" and has the sink plumbing at the very top going vertical to the stack.

My goal is to remove this 7" pony wall, move all of my kitchen cabinets (new) back 7 inches and have all the plumbing in the sink box (new one will be 30"). my problem is, can this be accomplished without large expenses in plumbing?

Below are some photos of the current set up of plumbing.
Basic look under sink, currently it is 7" deep sink, aprox 22" wide and the box I believe is 27" wide. The new sink will area will be 9" deep, sink aprox 27" wide and the box will be 30".
I believe that white thing sticking out of the bottom is a waste removal or something, and not sure how it would work/exist if I don't have the wall in back either.
This is the current layout of the plumbing under the sink. The black pipe is the water overflow from the dishwasher that goes up to through the counter to the sink (I don't know what it's called). The white is the exit of the disposal.
Picture looking down the plumbing, it appears that my waste pipe goes directly into the floor and probably takes a sharp left turn to the stack.
Picture looking up the pony wall the plumbing going north. I see the two electrical (one is telephone i believe while the other is power).
This is the part that makes me worry if I can vent properly. This photo is all the way up the pony wall and I believe that is a horizontal vent that goes to the stack because it is at least 6" above the floor level. This is what would have to change.

I figured adding photos would make it easier to understand. With that entire pony wall being removed, the sink would move back 7" to actually be directly above the waste pipe. What would be the optimal plumbing/venting solution? Can a island loop be done in the space directly below the sink with the current waste pipe and water plumbing set up?

I can provide any additional details if they are required or that I may have missed.

Edit: I forgot to mention I am willing to reduce the disposals size if that is even possible, but I don't want to lose it. If plumbing is made easier with having the dishwashers exit pipe entering into the disposal and then going to the waste pipe that would be fine as well.

Edit 2: Also unless it wasn't clear, I live in a condominium, the floors are wood but it makes modifying anything below ground much much more difficult.

TheEplumber 04-29-2013 09:15 PM

199 Attachment(s)
To do an island vent you need too access the floor joist space from below so you can run the foot vent. Also, island vents take up a lot f space below the floor and often don't fit in typical joist depth.
Your best bet is to use a studor vent (auto air vent) inside the cabinet and abandon the horz. vent. I believe Seattle/ King Co. excepts them in their code standards.

lothia 04-29-2013 10:00 PM

Would I not just be able to put the foot vent where the toe kick of a cabinet would be? If I am 4' or less from the vent that would be enough space for it get the 1/4" per foot required I believe. Wouldn't the hardest part just be combining the two pipes together?

Or if I had the space behind my lowest cabinet drawer couldn't go directly behind the cabinet drawers?

With all the hate online for AAV's it just seems like an island fixture vent would be optimal.

TheEplumber 04-29-2013 10:34 PM

199 Attachment(s)
will this fit?

Javiles 04-29-2013 11:30 PM

Not to mention vent loops are no longer code approved in some areas. :no:

Alan 04-30-2013 09:20 AM


Originally Posted by TheEplumber (Post 1169858)
will this fit?

They forgot the cleanout on the upper end of the foot vent.


lothia 04-30-2013 12:13 PM

Why would a loop vent be against code? If I require a vent in a peninsula I thought the only two options are AAV's and Loop vents.
I was looking at fitting an loop similar to that image, however It would be directly behind the sink like this,

I thought that if the cleanout was right above the foot vent it was considered good?

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