I am renovating a 2 pc ensuite and plan to add a tub. The plan has the tub drain & overflow entering the crawl space 1" from the main soil stack & vent. I was going to connect the tub to a sanitary T connection in the stack just below the floor. However, with the tub drain so close to the stack, I have no room for a P-trap let alone minimum pipe distance from the stack. Even if I vent the tub separately, ultimately the tub drain has to connect to the stack, and I can't envision how to do this without a bunch of 90's and a loop away from the stack and then back. Advice?