Best way to get level horizontal rows with subway tile?
I'm about to start tiling the walls of my bathroom remodel. I'm using 3" x 6" ceramic subway tile in a brick pattern and tiling approx 44" up the wall off the floor (66" around the top of the tub). The floor in the bathroom is sheet linoleum (the real stuff, not vinyl). I plan on using tile baseboard pieces at the bottom where the wall tile meets the linoleum on the floor.
My house is old and the bathroom is about 1 inch un-level from one end to another (over about 9 feet). Here's my initial plan, but I wanted to run it by everyone to see if it sounds reasonable. I was going to attach temporary ledger boards to run the first course of subway tile. The height of this first row, from the floor, would be the height of the baseboard tile on the low end of the floor. The ledger board would assure the first row would be level and then I could use that row as a reference as I go up the wall. Then when I go back to put the baseboard in I would have a full tile on the low side and trim the top of the baseboard tiles on the high side.
Any thoughts? Would that look weird or jump out at you when you see it? Any alternative suggestions?