NV C-4E Drywall Practice Questions - Nevada C-4E Drywall Contractor Examination Exam

The 20, 45, and 90 designations on setting-type joint compound refer to what?

The sanding grit that must be used The maximum joint width in inches The fire-resistance rating in minutes The approximate working time in minutes before the compound sets

Correct Answer:

The approximate working time in minutes before the compound sets

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