Hi Jean,
Unfortunately some people that install tile cut corners in order to give customers a cheaper price and/or to save an hour or two & the cost of a tube of caulk? Some tile people don't know the right way. Also, some customers don't hire "real" tile setters because the handyman "hack" will do it for less, well dahhhhhhh.
The joint to the tub will almost always crack, mainly because today's tubs are so flimsy. So, that joint should be caulked with a matching color to the grout. Actually any change of plane or joints of dissimilar materials should be caulked.
Chances are the lack of perimeter open gaps (expansion joints), will not cause a problem in such a small space unless there are other problems.
Jaz |