I'm reconfiguring an upper floor bathroom and trying to figure out the plumbing. In particular, I want to move the toilet to the far left hand side of the bathroom; put a double vanity in the middle; and a shower stall on the right. The main stack is in the middle of the bathroom, so the toilet presents a problem, as I can't drill a large enough hole through the joists (I have true 2x9 joists, so maximum hole size is 3"). My idea is to drop the line just below the joists and run it in a soffit until I can join the main stack, which is embedded in a large brick channel in the exterior wall.
I'm in NYC so I believe I'm under UPC. One question I have is whether I need to add a cleanout on the right hand side (I'm assuming the toilet counts as a cleanout on the left). Another one is whether than double 1/4 bend is allowable; I would assume so since it's directional, but I've never really seen anyone use one before.
Any feedback appreciated.