Slab on grade, one bath, back to back with Kit.
My sketch shows the bath tub, wc and a floor drain for the boiler/HW, with a 3" branch in the plumbing wall to pick up the two sinks and laundry tub. My inspector says the double San T for the wc and floor drain is wrong. We use the 06 UPC and in 706.2 it says the double san T is ok if I am reading it right. My inlets are 3" and the 4" barrel would be two pipe sizes larger, 3"-3.5" then 4". What do you think? The inspector wants me to dig up the slab and replace the san t with a double fixture fitting or fill in the floor drain with concrete. The pipe above the slab has not been done yet, but this is what I thought it would be. Do I need vents in the 3" branch? All trap arms are well within the critical distance. The inspector wants each of the fixtures in the 3" branch to drain separately into the 4" stack, not to use a branch. He also wants me to use a laundry tub (2 fixture units) for the washer drain hose instead of a stand pipe which is 3 fixture units. Thanks for the help.