Moving Drain (& supply lines in the way) for shower

A written code only tells you what you are allowed to do.
"Shall rise vertically" means that it is the only way which it is approved to be done.

The drain line can be re-routed in any direction that will bring you to a wall in which you can run the vent.
New York State Plumbing Code- The vent "shall rise vertically" (905.4) within 6 feet of the trap. (906.1)

You can interpret the code incorrectly all you want, you're still in the wrong, it says so right there.

I already told you how you could do this properly, but you chose instead to ignore that advice and try to use the existing drain with slight modifications. I asked what was under the bathroom for a reason. It is more work, but sometimes doing things properly takes more work.

I take offense to the wording "chose to ignore". I am faced with a very difficult situation here, trying to make right what someone did incorrectly before me. The space below this job is finished living space (a half bath to be precise).

The code is written in a manner leaving it unclear. If horizontal runs are strictly prohibited, it should say so. To me all it says is how high you need to run the vent before stopping. It also says the vents should be graded to drain.

I take it neither of you have access to the UPC, to answer my question about what it says about flat venting?

hiperco said:

I take it neither of you have access to the UPC, to answer my question about what it says about flat venting?

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I do not, because my state has it's own code. If you live in a state that has it's own code, you have to follow it first and foremost.

If you want to try to avoid the code, call your plumbing inspector over and ask him what he will allow. He's the only one that should be signing off on your work.

Terry said:

On this forum, you will tend to get advice as to the best way of doing things.

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Quoted for truth.

The "best" way of doing things needs to address ALL design parameters and constraints, and may mean compromises in form while still achieving the required function. Given the presence of the cable bundle (and the holes in the joists not properly placed already), the presence and routing of the water supply lines, the proximity of the main waste pipe, the proximity of the water closet connection to the main waste pipe, the need to center the drain in the shower floor, the finished living space below, etc, my proposed design accommodates these constraints and provides a vent to the drain that will almost certainly work without issue for the life of the structure.