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What Jim is referring to is to install the hardibacker above the mud pan, so that the boards aren't sitting in the mud, and can't absorb moisture in from the pan. As a extra precaution, applying redgard on the cut edge of the hardibacker wouldn't hurt to eliminate entry points for moisture, should water ever get between then silicone bead between the pan and hardibacker.
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“ Sometimes you set tile, other times tile sets you!”
Christopher Machado
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