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Can cement board be installed directly to the floor joists?

cement directly floor installed joists
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Can cement board be installed directly to the floor joists?

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No, cement backer board is not a structural member. It must be installed over an exterior plywood subfloor, 5/8″ minimum thickness.

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No, cement backer board is not a structural member. It must be installed over an exterior plywood sub floor, 5/8 inch minimum thickness.

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