[jimbo2012]

Tile must be glued or installed in thin set.

Why would you spend all that money on base that can move, it could cause cracking and grout loosening up.

THe right way to do ANY floor is to first do a moisture content test on the concrete, I bet these guys don't do it, it takes 60-72 hours to run that test, ask me how I know....I'm doing it right now.

To be blunt, if these guys do it like that they are not true pros IMO.

U get to bare concrete and spend 3-400 dollars for the thin set or moisture barrier glue according to the results of the moisture content test.

Real pros know this........it's your money and choice.