Horizontal wet vent

Discussion in 'IPC Plumbing Code Questions' started by Stereo, Jan 15, 2020.

  1. Stereo

    Stereo Member

    Joined:
    Dec 14, 2019
    Location:
    Colorado
    Regarding horizontal wet venting, the 2018 IRC P3108.1. says, in part, “Each fixture drain show connect horizontally to the horizontal branch being wet vented OR shall have a dry vent.”

    Can the drain of a lavatory downstream of the start of a horizontal wet vent (with additional fixtures entering the horizontal wet vent horizontally further downstream) connect to the horizontal wet vent vertically if it has a dry vent, or does the lavatory drain still need to enter the horizontal wet vent horizontally? The code is unclear, but I’m wondering if a vertical entrance of the lav’s water would interfere with the air gap that needs to be maintained in the upper half of the horizontal drain.
     
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