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Thread: Vertical Wet Venting Question

  1. #1
    DIY Junior Member sethamin's Avatar
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    Default Vertical Wet Venting Question

    Is the following wet venting permissible under UPC?

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    I'm pretty sure the answer is no, but thought I'd check with the experts just in case, since it would make my life easier.

  2. #2
    DIY Junior Member sethamin's Avatar
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    I think this is the relevant section of 2009 UPC:

    908.1 Vertical Wet Venting.
    908.1.1 Where Permitted. Wet venting is limited to vertical drainage piping receiving the discharge from the trap arm of one (1) and two (2) fixture unit fixtures that also serves as a vent not exceeding four (4) fixtures. Wet-vented fixtures shall be within the same story; provided, further, that fixtures with a continuous vent discharging into a wet vent shall be within the same as the wet-vented fixtures. No wet vent shall exceed six (6) feet (1,829 mm) in developed length.
    This doesn't seem to disallow it, but I still seem to recall reading somewhere the UPC disallows wet venting into vertical drainage. Maybe 2012 UPC has some changes on this?

    Anyone?

  3. #3
    Moderator & Master Plumber hj's Avatar
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    quote; recall reading somewhere the UPC disallows wet venting into vertical drainage.

    That is the way the majority of wet venting is, and always has been, done. But, unless that is a side inlet sanitary tee for the tub connection it is wrong,. It cannot go into a double "Y or double combo. The lavs cannot use a double combo OR a sanitary cross, it must be a "back to back fixture fitting".
    Licensed residential and commercial plumber

  4. #4
    DIY Junior Member sethamin's Avatar
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    Quote Originally Posted by hj View Post
    That is the way the majority of wet venting is, and always has been, done. But, unless that is a side inlet sanitary tee for the tub connection it is wrong,. It cannot go into a double "Y or double combo. The lavs cannot use a double combo OR a sanitary cross, it must be a "back to back fixture fitting".
    What about a double fixture fitting for both of them?

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    Moderator & Master Plumber hj's Avatar
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    Do you realize what a 3" B2B fixture fitting costs?
    Licensed residential and commercial plumber

  6. #6
    DIY Junior Member sethamin's Avatar
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    Well, I do now. They're pricey. I just have to figure out if it's cheaper to do that rather than running an individual vent for the toilet and tub and tying them back in above.

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