Concrete backer board for tile

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.
2. 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.
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Franz Fripplfrappl
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No. The backerboard must be fully supported, and preferably adhered to the subfloor.
R
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