NV C-17C Drywall Practice Questions - Nevada C-17C Drywall Contractor Examination Exam

Where does IBC 2018 2509.3 prohibit water-resistant gypsum backing board?

Only when the board is 5/8 inch thick Over a vapor retarder in a shower or bathtub compartment, and where there will be direct water or continuous high humidity On any wall in a dwelling unit Only on ceilings above 9 feet

Correct Answer:

Over a vapor retarder in a shower or bathtub compartment, and where there will be direct water or continuous high humidity

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