Basement Bar Sink Drain

[snooze091]

Hi -

I would like to add a bar sink to my basement. There is currently a roughed in bathroom (sink, shower, toilet). My understanding is that this is a wet vent and based on the code if I want to add a fixture outside the bathroom I would need to vent it, but then drain after the wet vented bathroom fixtures. This requires digging up the concrete. Before I think about that path I would like to:

A. Verify that the drawings below would NOT meet code.
B. If A is true, do I have any other options

Ohio - IPC
Thank You!

 

[Mulon1982]

Hi -

I would like to add a bar sink to my basement. There is currently a roughed in bathroom (sink, shower, toilet). My understanding is that this is a wet vent and based on the code if I want to add a fixture outside the bathroom I would need to vent it, but then drain after the wet vented bathroom fixtures. This requires digging up the concrete. Before I think about that path I would like to:

A. Verify that the drawings below would NOT meet code.
B. If A is true, do I have any other options

Ohio - IPC
Thank You!

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By the way, if you’re planning to design the bar area itself, I found some really creative bar wallpaper ideas that might inspire you — they make a huge difference in turning a basement bar into a stylish and cozy space.

You’re correct — under the IPC (as adopted in Ohio), you typically can’t tie a new fixture into a wet-vented bathroom group unless it’s within that same group. Adding a bar sink outside of it would indeed require its own vent and a proper connection after the wet vented portion of the system, which often means opening the slab.
That said, before you start digging, it’s worth checking two things:

1. Existing venting layout – Sometimes a vent stack or dry vent line nearby can be utilized if accessible.
2. Studor (AAV) options – In some jurisdictions in Ohio, air admittance valves are allowed if installed per code and accessible for maintenance. This could save you from breaking concrete.

Still, your first step should be confirming the layout with your local building department or a licensed plumber — they can verify exactly how your wet vent is configured and whether an alternative venting method could pass inspection.