Im remodeling my bath and i had a shower/bath combination---draining into a 1-1/2 drain (cement floor) i want to set a tub 5 feet away from this drain and a shower stall 2 feet away---can i simply jackhammer a ditch and lay a new pipe over and tie into that 1-1/2 thats down in the cutout in the cement---i cannot move this---someone said that i would need a 2 inch drain--if so then i guess i will have to just go back with a tub and shower comb---any help would be greatly appreciated thanks Lee