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.
Similar Threads: Horizontal vent
Forum Title Date
IPC Plumbing Code Questions Can I do a 90 degree horizontal to horizontal sink & shower into 3x3x2x2 wye? Jul 30, 2018
IPC Plumbing Code Questions Venting Bathroom and Laundry Rooms - Unnecessary Vents? Jul 13, 2020
IPC Plumbing Code Questions Basement Bathroom - Single Vent Jul 13, 2020
IPC Plumbing Code Questions No Future Vent In Basement--Where do I vent Toilet, Sink and Shower Mar 3, 2020
IPC Plumbing Code Questions Where to tie in new basement vent Feb 16, 2020

Share This Page