No this is not a floating system. The instructions tell you to put silicon on the tapcons before you screw them in. They also say to use low expansion foam around the edge if you are butting the floor up to an existing wall.

My concrete is pretty flat so I have no worries about using 1/2 inch. The instructions say you can use as skinny as 7/16 if you want to.

-Ben
HT v2.0
HT v1.0