Im moving my tub 8 away from its present stack/vent with only a 9 1/4 joist space to run the drain line. To vent this should I wye in just beyond the trap and run another parallel line above the drain line over to the vent stack? Using 1 1/2 waste line, does the vent line also have to be 1 1/2 or will 1 suffice?
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