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ahhh... ok. So the max distance of the arm accounts for the fact that, assuming a 1/4" drop per foot, the inside top of the drain pipe (trap arm) going into the stack will not be lower then the inside bottom of the trap arm at the trap. For the siphon effect to take place, the outlet of the...

Very good... ok, so here's one thing (one of many, that is) I am unclear on. On a stack vented fixture, where the trap arm is not longer then the distances listed in the code book, why doesn't it siphon? Why would a long trap arm siphon and a short one not?

I understand. Well, I can handle all the framing issues that might arise, having been a carpenter for quite some time. I am not worried about that. But I am interested in the theory behind the DWV, so any general info related to this situation would be helpful. Whatever I end up with, I...

I am open to either of these layouts. Note that I do plan on building some type of cabinet in the top left corner. The boxed out vent will be hidden in that. One option that recently occurred to me is if the cabinet is wide enough, it could potentially go over the stack from first floor...

Actually, the lav drain meets the bath drain like below, not in the wrong direction!

Thanks for responding... The branch lines to the lav and bath are 2" copper. Actually, the minor plumbing change I had made before I ripped up the whole subfloor was to just move the lav drain (originally an S-Trap into the floor) into the wall using a P-Trap into a pedistal sink... However...

I am in the middle of remodeling the upstairs bath in my 100+ year old victorian house. My original plan was to not mess with the plumbing to much, but as usually happens in a remodel, plans have changed midway though. A couple of nights ago, as I was relaxing after a hard day of thinking...