From reading on this and other boards, I see that in order to to convert a tub/shower to a shower I must replace the 1.5" waste line with a 2" waste line. I understand this is code, but can anyone explain the rationale? I don't see the difference between using a tub/shower and a shower. If I take a shower in a tub/shower or a shower stall, the water use would be the same. What gives?
thanks in advance.