Full bath drain renovation

[Squiner]

I gutted my 4'x14' bathroom. I am attempting to correctly design the drain and venting. I have attached a drawing of my design. I have checked with the IRC 2009 and I think this is correct.

Based on IRC 2009 Table P3005.4.1, I need to have a 3" drain branch for this bathroom. Therfore, do I need to have a 3" dry vent connected to this wet vent? Table P3108.3 requires a 2 1/2" wet vent for a DFU of 6. But P3005.3 also says "The dry vent serving the wet vent shall be sized based on the largest required diameter of pipe within the wet-vent system served by the dry vent."

The last concern I have is that the vent will be 14' from the toilet, is this too far or does exception for P3105.1 apply here: "Exception: The developed length of the fixture drain from the trap weir to the vent fitting for self-siphoning fixtures, such as water closets, shall not be limited."

Thanks for your help!

 

[phishfood]

The section of pipe from the shower stall to the vertical vent is not allowed to be horizontal. You need to turn up for the vent, and put a sanitary tee on top of that to attach the shower drain to. The code you are looking at differs considerably from what I am familiar with, so I can't comment on your other questions.