Concrete backer board for tile

[franz fripplfrappl]

I would like to install ceramic tile over radiant floor tubing.

Can I do this with acceptable results?

1. Install PEX on top of existing subfloor and use furring strips of appropriate thickness between loops.

1. Install 1/2" concrete backer board on top of furring strips.

Heat transfer plates and thermal mass not an issue at this point. I am more concerned about structural integrity, i.e., will back board be strong enough to support tile without flexing or cracks in either tile or mortar.

[RicodJour]

No. The backerboard must be fully supported, and preferably adhered to the subfloor.

R