Red Seal Drywall Finisher and Plasterer Practice Exam

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How can you determine the right screw length for drywall?

The screw should penetrate the stud by at least 1 inch
The screw should be equal to the thickness of the drywall only
The screw should be 2 inches longer than the drywall thickness
The screw should penetrate the stud by at least 2 inches

The correct answer is: The screw should penetrate the stud by at least 1 inch

Choosing the appropriate screw length for drywall installation is crucial for ensuring strong and secure attachment. The correct approach is that the screw should penetrate the stud by at least 1 inch. This ensures that the screw is long enough to provide a reliable grip in the stud behind the drywall, allowing the drywall to be firmly anchored and preventing sagging or detachment over time. Using a screw that penetrates the stud by at least 1 inch balances the need for stability with practicality in screw length. While the thickness of the drywall is important, it is equally essential that the screw engages deeply with the stud for effective fastening. This practice contributes to the overall durability and integrity of the drywall installation. Other options may suggest longer penetration depths or specific relationships between screw length and drywall thickness, but they would not provide the necessary anchor needed for most drywall applications in typical framing scenarios.