I am currently in the process of remodeling my bathroom in a 40+ year old house that I just recently bought. This project started because the floor tiles were coming up from the floor at the left front corner of the tub. This is a left hand drain tub. At the point where the tiles were coming up, the 3/4 floor was water stained.
I replaced the 3/4 floor around the entire bathroom. The sub floor was fine. I bought a new 60x30 soaking tub. I followed the manufactures installation instructions. the tub was level on three corners. The front of the tub - left corner was not touching the floor. There was a 1/2” difference between the tub and the floor. The manufacturer of the tub (American Standard) does indicate that you can not put leveling material under the tub, which means that the only location I can level is by the integral apron. I can not drill the tub by the flange, to support it on the wall joists, because it will crack.
A friend suggested that I put shims on that one side. This concerns me due to that fact that the gap under the tub extends about 20 inches before the apron contacts the floor.
Plus due to the weight of the water and bather, could the shims deteriorate, causing damage to the tub and drain?
If I place 1/4 cement backer board on the floor and then the 1/2 tiles, both butted to the tub, one side of the tub would to be lower than the other by 1/2 to 3/4 inch.
Alternatively If I level the floor by the front of the tub across the room, this would raise the entryway into the bathroom by at least 1.5 inches. I assume that I would have to put a strip of 1/2 plywood on the floor under the tub, across the room and then thinset the rest, from the height of the plywood to the center of the room. Then I would place the cement board on that.
I really don’t know which way is better aesthetically, practically or structurally.
Please let me know what the best course of action is and how I should do it.
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