Jasonmcl
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I am adding a bathroom with a sink, toilet, and tub to some existing space in my attic. Currently the 2nd floor will be 18 inches from the floor below. A 3 inch drain line will have to run 30 feet horizontal and then vertical into the slab. The entire run for the 3 inch drain will consume 7 inches and leaves me with 11 inches for all the fittings. My question is what would be the minimum floor width that is need under the floor to attach all necessary traps and fittings?