The tiled shower. It is hard to beat the sophistication, of a site built, tiled shower.
The 2015 Michigan Residential Code has a fairly long list of requirements for site built showers. They call them Shower Receptors and can be found in P2709.1 MRC.
“Where a shower receptor has a finished curb threshold, it shall be not less than 1” below the sides and back of the receptor. The curb shall be not less than 2” and not more than 9” deep when measured from the top of the curb to the top of the drain. The finished floor shall slope uniformly toward the drain not less than 1/4” vertical in 12” horizontal nor more than 1/2” per 12” horizontal and floor drains shall be flanged to provide a water-tight joint in the floor.”
