Kevin, I built a buffet about 24 inches deep, 70 inches wide, and
put a tile top on. The top has a 3 inch oak border around, and a 4
inch divider piece in the middle. The tile is 6 inch square (matches
the entry hall), each half is 2 rows of 8 tiles I think. I stuck the
tiles down with some type of glue, and when dry, filled with the same
grout used in the hall. The border is white oak, 3/4 inch thick, and
the center where the tile is is about 1/4 inch thick. All glued up
before the tile went in. I built this 2 years ago, and it is in the
dining room at approx 70 degrees. Not a crack to be found anywhere.
I did the same thing for a backstop to the buffet, 12 x 70 inches, and
no problems there either.
Hope this helps.....