Red Seal Drywall Finisher and Plasterer Practice Exam

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What is the standard thickness of residential drywall sheets?

1 inch
3/4 inch
1/2 inch
5/8 inch

The correct answer is: 1/2 inch

The standard thickness of residential drywall sheets is typically 1/2 inch. This thickness offers a balance of durability and weight, making it suitable for most interior walls and ceilings in residential construction. It provides adequate coverage and fire resistance while being easy to handle and install. While other thicknesses, such as 5/8 inch, are used in specific applications (like for ceilings or when additional fire resistance is required), 1/2 inch remains the most common choice for standard interior wall applications in homes. Options like 1 inch and 3/4 inch are generally not standard for residential drywall applications and are more commonly associated with specialty boards or specific construction needs.