Originally Posted by T-Bolt
You will have the most problem with the grout cracking. Use a polymer based grout that is intended for use with luxury vinyl tile (LVT). I have used it on lots of projects with a zero failure rate.
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I have seen this in manufactured homes. They used standard grout and it cracked and came out in chunks. The ground it all out and re grouted with the flexible stuff.
In mine the regular grout held up fine but I went to great lengths to stiffen the sub floor.