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Thread: WC venting, UPC code

  1. #1
    DIY Senior Member DavidTu's Avatar
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    Default WC venting, UPC code

    I have the following situation for a WC (see pics)... the WC is dropping to a closet bend then going down for around 1ft at 45-deg... I can vent it either on the 45-deg drop (so about 10" below WC) or after it levels out (around 14" drop from the WC). I cannot vent before dropping down b/c there is a chimney in the way and I must turn and drop right away.

    Normally, for a fixture the vent take-off must be above the p-trap weir; in a WC of course that is not possible... but I am wondering what the acceptable limits are... or how far can I drop below WC closet flange before venting?

    So am I ok with alternative #1 or #2 (see pics) or must I do something else?

    Thanks!
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  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    For the water closet, either would be fine. It needs to be a wye or combo fitting on the vent.
    For a water closet, you could even have taken it off the vertical with a wye. In King county, the vent should be within six feet of the flange.

  3. #3
    Moderator & Master Plumber hj's Avatar
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    Either will be fine, but if the inspector is one who only reads the book, but does not know WHY it is in the book, he may have a problem with it.

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    Forum Admin, Expert Plumber Terry's Avatar
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    The Seattle inspectors are good. I don't see a problem.

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    DIY Senior Member DavidTu's Avatar
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    Thanks much!

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