lav rough in to tub/shower drain pipe

[murphyplumbing.com]

I’m remodeling a small master bathroom and am investigating adding a lavatory rough in to an alcove area on a wall adjacent to the master bathroom. I’d like to connect the lavatory drain to the tile shower/tub drain using a horziontal Y branch line that connects to a double combination Y(back to back vent/waste stack shared by the tub/shower drain in the other bathroom).

The new lav location is about 5′ from the tub/shower vent, so I can add a revent from the lav to the vent stack above the water closet that vents to the roof. The shower/tub vent is already revented to this stack as well.

Can this be done per the UPC? I did some reading and it looks like each fixture drain line may need to be connected separately.

Thanks,

Lee

[Retired plbg1Participant]

It is hard to say but on safe side connect into pipe behind tub vent.

[Lee ShuckParticipant]

Thanks for the reply – I may just get a rough inspection without the additonal lav and ask at that time if they will allow it, then I could take it from there. Two inspections that way, but I’ll keep my project moving along and won’t have to tear out something that’s not right.

Lee

[Author]

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