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Why can I put HardieBacker™ cement board directly onto concrete or other sub-floors?

April 26, 2017cement concrete directly sub-floors

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Why can I put HardieBacker™ cement board directly onto concrete or other sub-floors?

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» The primary function of HardieBacker™ cement board is to provide a water resistant flat surface to tile on; it is not designed for use over concrete. The minimum sub-floor specified is 15.8 mm exterior grade plywood sub-flooring with a deflection not greater than 3mm for live and dead loads over joists that do not exceed a span of 400 mm centres.