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I am remodeling a kitchen at a 5-year old home. The home owner has requested an island be added to the center of the kitchen. The existing kitchen configuration is “u-shape” including a peninsula. The exisitng peninsula houses the sink and the dishwasher. The sewer vent is run through the short wall to the main stack at a near wall. The entire house is constructed on a slab. I am having a difficualt time trying to figure out how to install the vent back to the wall under the slab. Please help.
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John:
There is a nice article in Journal of Light Construction on Island Vents this monthn. The bottom line is that in any island configuration, whether you are installing a downdraft stove or a sink, you will need to bust up concrete to the soil stack to vent.
No big deal, as you will also have to bust up concrete to bring in supply lines, right? Make sure you sleeve those copper lines, John.
Good Luck!
*John: Taunton's excellent book on rough plumbing (versus the one on fixtures) has a detailed diagram of plumbing a vent for an island. Get out the jack hammer. Sorry. -David
*In these parts most all kitchen sinks that are installed in islands are vented via a Sutdor vent (air admittance valve). Some people don't like 'em, but the house I currently live in has at lease 3 of them - due to a slam-bam plumber. They seem to work fine for the most part. try http://www.studor.com/specifications.htm
*I beleive the mechanical vents are allowed by code in certain situations. I had a home once with one under the kitchen sink and never had any problems. I dont like the idea of using them but its a heck of a lot less than tearing up the slab
*Maybe you need a "brace" for those (potential) cabinets over the island? A false one you could run the vent through? I doubt the homeowner will still want the island when he/she hears how much trouble it will be for a little vent line.
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I am remodeling a kitchen at a 5-year old home. The home owner has requested an island be added to the center of the kitchen. The existing kitchen configuration is "u-shape" including a peninsula. The exisitng peninsula houses the sink and the dishwasher. The sewer vent is run through the short wall to the main stack at a near wall. The entire house is constructed on a slab. I am having a difficualt time trying to figure out how to install the vent back to the wall under the slab. Please help.