Kitchen Island Sink
We are renovating our kitchen and want to put a sink in the island. I have heard that plumbing inspectors do not like this configuration and will not sign off on it….this seams strange to me since I see island kitchen sinks in every new developer building prospectus. Our plumber said that it has something…
We are renovating our kitchen and want to put a sink in the island.
I have heard that plumbing inspectors do not like this configuration and will not sign off on it….this seams strange to me since I see island kitchen sinks in every new developer building prospectus. Our plumber said that it has something to do with the vent pipe not being over the rim of the sink (english isn’t that great). If we install a sink with an overflow will this be acceptable to a plumbing inspector? Thanks for any light you can shed on this.
A loop/bow vent is the only legal and proper way to vent an island sink. The vent pipe comes up from the threaded trap tee as it normally would and makes an immediate turn via elbows. It then goes back into the floor where it ties into the pipe that also vents the sink’s under-floor drain pipe. The important points are to keep the loop as tight to the underside of the counter as possible and to have the final vent connection tie in to a vent stack at least 6″ above the flood level of the sink.
Two more points: I have looked at many new island sink installs over the years in NYC and have yet to see it done correctly. Also, if you are in old brownstones with non-vented wet-stack plumbing that there might be no point to vent a new island sink completely by the book (unless you plan on replacing all the plumbing). This particular case and perhaps a temporary installation are the only two places where you should consider using an air valve.
AAVs, Studor Vents, Pro Vents, etc.,are not allowed in New York City.
It also sounds like your plumber may not know the correct configuration, which does not actually use a Flovent or a Studor vent…
http://www.rd.com/how-to-plumb-an-island-sink/article19540.html
If it’s not allowed, which of course is ridiculous, get the renovation signed off and do it after the fact. These are standard throughout the country.
This is normally done in other parts of the country per code by using a Studor Vent.
http://www.ipscorp.com/studor
I am not sure if this is now allowed in the new code. Maybe one of the plumbers could comment further.
Jock deBoer, AIA
deBoer Architects