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I grouted the horizontal along the tub and it cracked. I removed the grout and replaced with caulk. 2 years down the road still good. By the way, I read similar info about caulking wherever there is a change in plane, but ignored it. I also caulked where the tile floor meets the tub. My verticals, corners, are fine with grout. You have to remember there are different thermal expansion properties between the tub/shower pan and the tile so you will eventually get cracks where these 2 different materials meet.
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