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I plan on tiling a laundry room concrete floor.
Two adjacent walls are cinder block.
I know NOT to use grout between tiled walls and floors or it will crack.
However, since there should be little or no flexing between the surfaces, can I use grout in this situation?
There isn't a right way to do this. In my opinion I would grout the area unless it is razor thin. In most cases this won't be uniform as a wall isn't exactly flat and so you may end up with a rather large gap in some areas - more than 1/8th inch. If your grout does crack in the future it looks just fine with a layer of caulk over it.
you know it will crack. Just use flexible caulk.
