hi there re-doing a bathroom upstairs which was badly renovated in the first place. 1950 house -
cast iron stack, ABS/copper in bathroom bathroom is 10x5 the tub is located with a 10' run to the main stack. the sink drains into the main stack and the toilet drains into the main stack. the sink is vented as is the tub at source. the drain from the tub currently is 1.5" running ...