What is the primary purpose of using shims in door frame installation?

The primary purpose of using shims in door frame installation is to adjust and level the frame. Shims are small, thin pieces of material that can be inserted between the door frame and the rough opening of the wall. This adjustment ensures that the frame is plumb, level, and square, which is essential for the proper operation of the door. If a door frame is not properly aligned, the door may not close correctly or could bind against the frame, leading to functionality issues.

In practice, shimming allows carpenters to make precise adjustments during the installation process. It compensates for any irregularities in the wall or flooring, ensuring a secure and correct fit for the door. This is particularly important to avoid future problems with the door's operation, such as sticking or drafts.

The other options focus on aspects that are not the main function of shims. While aesthetics, security of hinges, and insulation may play roles in carpentry, they do not encompass the primary function of shims during door frame installation. Shimming addresses the foundational alignment and stability that are critical for proper door functionality.