in reading over the post, again I read that the tile seams were separating or spreading apart. I did not read that they were just coming up.
I would have answered differently if I understood also that the tiles were just coming up at the seams.
I have been to areas where the tile actually separated due to floor settling and this was the only way. But, this case was actually stretching apart due to the house settling forces.
So, read it again and you might see my side. This is why I was puzzled at first, but went on ahead.
© 2017 Renovate Your World LLC