California Residential Inspector Practice Exam

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How far apart should screws be spaced when fastening two layers of 3/8" gypsum board to ceilings?

12 inches
14 inches
16 inches
18 inches

The correct answer is: 16 inches

The recommended spacing for screws when fastening two layers of 3/8" gypsum board to ceilings is 16 inches on center. This spacing is essential for ensuring that the boards are properly secured and will effectively carry the load, while also minimizing the risk of sagging or buckling over time. Fastening the boards at this interval helps distribute the weight of the gypsum board evenly across the framing members, providing a sturdy and resilient installation. Using appropriate screw spacing also helps to reduce the likelihood of cracks forming in the joint compound during the drying process or over time due to structural movements. The guidelines for spacing screws are established by industry standards and best practices to achieve optimal performance of gypsum board installations. Other distances, such as 12, 14, or 18 inches, do not meet the standard recommendations for this specific application, making them less suitable for ensuring that the gypsum board is securely attached to the framing.