I have a new project. I have a 1960's bath that has a 16" deep home-made tiled tub/shower, about 16 square feet in area. I've already pulled up the old tiles on the floor of the tub and plan to leave the walls as they are. The old tiles were set on a mortar base. The bottom row of wall tiles is coved. I want to put river rock "tile" down, but want a steeper slope to make sure the floor will drain well. I'd like to raise the perimeter at least 1" and slope it down to the drain. What can I use to raise the floor of the tub area? thin-set? Cement? the sand/cement mixture "Mud" I used to slope my other bathroom? How much trouble can I expect if I cover up the coved part of the bottom row of tiles with the new pebble? I use laticrete expoxy grout, so I have a lot of confidence in the strength of the grout.
Thanks in advance for the advice.