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yule1111: "a) hardy boards are better than durock which is a better replacement for plywood? any disadvantages to hardy boards as the subfloor material?"
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yule1111, just for the record HardiBacker IS NOT NECESSARILY better than Durock, I don't know where you got that information. It is simply a matter of choice for various reasons but in truth they both perform the same.
NEITHER is
it a replacemnt for plywood. They are two entirely different products with entirely different functions.
HardiBacker
CAN NOT be used as a subfloor material, never. Hardi is an underlayment material for ceramic tile and stone but can not be used as a subfloor material.