Exterior gypsum sheathing fasteners should be spaced _____ apart.

For exterior gypsum sheathing, fasteners should be spaced a maximum of 7 inches apart to ensure proper attachment and structural integrity. This spacing is critical because it allows for adequate support while minimizing the risk of the sheathing panels shifting or sagging over time. The manufacturer's specifications and building codes generally dictate these spacing requirements, which are designed to maintain the performance of the sheathing against weather exposure, structural loads, and potential impacts.

Each of the other spacing options exceeds the recommended distance, which would compromise the sheathing system’s effectiveness and could lead to issues such as moisture infiltration or structural failure. Proper installation of fasteners at the correct spacing not only ensures compliance with safety standards but also prolongs the life of the exterior sheathing.