  I hammer drilled spacing strips to floor and ran electrical heating wire as per above... I found that these strips set up fairly high...when I laid out my tiles it was apparent that I would need a very thick thinset coat to prevent tile rocking...so I used a thin layer of Mapei self leveling compound over the wires to hold them in place... then I removed the strips and screws this gave me a leveler surface to which I applied the thinset and tiles... the results were good   IN FLOOR HEATING A SIMPLE PROCESS OF LAYING TUBING AND POURING CONCRETE TO COVER
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