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  1. #1
    Michael Burch's Avatar
    Michael Burch Guest

    Default WI code for air gaps

    Does WI require an above counter air gap be installed, or can I loop and attach to the under side of the counter? I also have a garbage disposer. I am putting in a granite counter and I would like to avoid putting an above the counter air gap. Thanks for any help.

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  2. #2
    Join Date
    Nov 2007
    Location
    Chicago
    Posts
    548

    Default Re: WI code for air gaps

    I am not sure what WI requirements are, you should check with the local plumbing inspector in your town. Having one is not a bad idea though. They do make decorative type air gaps so it will not be so unsightly. In the picture there is a few examples.

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  3. #3
    Join Date
    Mar 2007
    Location
    Hudson, WI
    Posts
    645

    Default Re: WI code for air gaps

    From WI plumbing code.

    Comm 82.33(9)(d)1.
    1. `Residential type.' The indirect waste piping from a residential-type dishwashing machine shall not exceed a developed length of 10 feet. The indirect waste piping from a residential-type dishwashing machine shall be installed in accordance with one of the following methods:

    Comm 82.33(9)(d)1.a.
    a. Where an air-gap or air-break is located below the countertop, the indirect waste piping from the dishwashing machine shall discharge to a standpipe. The standpipe shall be at least 1 inches in diameter and shall extend at least 15 inches above the trap weir.

    Comm 82.33(9)(d)1.b.
    b. Where an air-gap or air-break is located above the countertop, the indirect waste piping from the dishwashing machine shall discharge to local waste piping. The local waste piping shall connect to the kitchen sink branch tailpiece above the trap inlet, the standpipe or to the dishwashing machine connection of a food waste grinder. When the local waste piping discharges to a standpipe, the standpipe shall be at least 1 inches in diameter and shall extend at least 15 inches above the trap weir. Where a hose is used for local waste piping, the developed length shall not exceed 18 inches.


  4. #4
    Join Date
    Nov 2007
    Location
    Chicago
    Posts
    548

    Default Re: WI code for air gaps

    Well since WI allows under the counter air gap. You just need to plumb in another trap with at least a 15" stand pipe. Then you can use the air gap pictured below.

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  5. #5
    Jim Weyenberg's Avatar
    Jim Weyenberg Guest

    Default Re: WI code for air gaps

    Michael,
    I'm with you on that one, I would not want to have that clutter on top of my granite either. Michael Larsons post second paragraph is what I see in new construction the most, a separate trap under the counter with a 15" stand pipe and the dishwasher discharging into the top. This accomplishes 3 things really, no clutter on the counter, no occasional over flow, and most importantly the noise is substantially reduced.

    Jim Weyenberg
    HouseMaster Inc.
    Senior Inspector
    2006 HouseMaster Inspector of the Year
    920-309-3410


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