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In some cases I have wanted the tile base lower than the sheetrock. This way there is not a large ledge for water to collect on. You can float some thin set to the surface but make sure it is completely dry prior to tiling and make a large taper or it will be noticeable.


Yes you can float on top of red guard before tiling. If you want a perfectly flat wall and assuming you are tiling then the proper way to do this is to put some 1/2" thick strips vertically make sure the strips are plumb and put a level across the two strips and make sure they are level with each other. Then you can put a fair amount of thinset and screed ...


What about adding 1/4" backer to 1/2" for firmness - Looks like a solution? The tub has been installed so another stud can't be added.

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