Grout is not appropriate at this location.
If you prefer the look of grout, however, you may still be able to pull it
off. Most grout manufacturers now make a line of matching "grout caulks" in
both sanded & unsanded varieties. They have the same color and texutre as
the grout, but the adheasion and flexibility of caulk.
Personally, I use siliconized caulk in this scenario.
Free advice - Don't be like a typical sub when you do it. Use tape to mask
both sides of the joint and then caulk. That will give you a nice, clean
look without smearing caulk down into the grout joints.
While everyone prefers silicone caulk, I have seen standard floor grout used
in several hotels (Embassy Suites in Paradise Valley comes to mind) and
seems to hold w/o problems year-after-year.
You could always use grout and if it doesn't seem to hold in your situation,
buy some silicone calk and repair it. Personally I would be tempted to at
lease try it.
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