Horizontal wet vent

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

  1. Stereo

    Stereo Member

    Dec 14, 2019
    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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