Stacking Drains?

[greyboy39]

Is stacking drains in this fashion prohibited? Both drains are serving sinks, one kitchen, one bathroom on shared wall. 

[Jim Katen]

What plumbing code are you on? 

Are there any other fixtures that dump into that vertical pipe? 

[greyboy39]

We're on the 2015 UPC. Nothing else drains into that pipe from above.

[Jim Katen]

As I read the requirements, it's fine. 

908.1 .1

Wet venting is limited to vertical drainage piping receiving the discharge from the trap arm of one (1) and two (2) fixture unit fixtures that also serves as a vent not exceeding four (4) fixtures. Wet-vented fixtures shall be within the same story; provided, further, that fixtures with a continuous vent discharging into a wet vent shall be within the same story as the wet-vented fixtures. No wet vent shall exceed 6 feet (1829 mm) in developed length.

908.1.2  

The vertical piping between two (2) consecutive inlet levels shall be considered a wet-vented section. Each wet-vented section shall be not less than one (1) pipe size of the upper fixture or shall be one (1) pipe size exceeding the required minimum pipe size for the sum of the fixture units served by such wet-vented section, whichever is larger, but in no case less than 2 inches (50 mm).

908.1.3

Common vent sizing shall be the sum of the fixture units served but, in no case, smaller than the minimum vent pipe size required for a fixture served, or by Section 904.0.

[greyboy39]

Thanks Jim I'm reading the same.