What is the minimum length of drywall screw required for installing 1/2 inch gypsum board to wood studs?

To install 1/2 inch gypsum board (drywall) onto wood studs, the minimum length of drywall screw required is 1 1/4 inches. This length is optimal because it ensures adequate penetration into the wood studs while allowing enough of the screw to grip the drywall securely.

Using a 1 1/4 inch screw strikes a balance, providing sufficient length to securely attach the gypsum board without risking damage to the drywall or over-penetration into the studs. This specific size is widely recommended in industry standards, ensuring the drywall remains firmly attached while also enabling proper finishing techniques without complications.

Longer screws, such as those measuring 1 1/2 inches or 2 inches, may not be necessary and could potentially lead to issues like tearing the board or creating an unsightly appearance. Conversely, a screw that is only 1 inch in length would not provide enough hold, leading to weak spots or the risk of the board pulling away from the stud over time. Thus, 1 1/4 inches is the correct answer, as it meets both structural and aesthetic needs in drywall installation.