What should be done if a nail is overdriven in fiber cement siding?

When a nail is overdriven in fiber cement siding, filling the hole and installing a new nail is the correct course of action because it ensures the integrity of the siding installation. Overdriving can compromise the hold and may lead to water infiltration, which can cause damage over time. By filling the hole, you help restore the protective barrier against moisture that fiber cement siding is designed to provide. Installing a new nail at the correct depth helps secure the siding properly, preventing potential issues such as sagging or warping.

Proper fastening is crucial in siding applications to maintain durability and avoid water damage. This method also adheres to best practices in installation, ensuring that the finished exterior is not only aesthetically pleasing but also functionally sound. The other suggestions, like leaving the nail as is, covering it with a cap, or simply removing it without addressing the hole, do not provide the necessary remedial work to maintain the siding's performance and could lead to future complications.