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Should USG Durock® Brand Cement Board Panels be waterproofed in wet area use?
For most interior applications, Durock® Brand Cement Board Panels are not affected by water and do not need to be waterproofed. Durock® is water durable but not waterproof. If you're looking for added protection to water sensitive material behind the Durock®, you may consider adding a waterproofing membrane. TCNA guidelines recommend the use of a waterproof membrane in interior wet areas.
For exterior applications, consult your design professional as vapor permeance is climate dependent.