What should you do if a door frame is not level before securing it?

When a door frame is not level before securing it, the best course of action is to adjust with shims. Shimming is a common practice used to ensure that the door frame is perfectly plumb and level, which is crucial for the proper operation of the door. If the frame is out of alignment, it can cause issues such as difficulty in closing, gaps around the door, and increased wear on the hinges.

Using shims allows you to make precise adjustments to the height and alignment of the frame, compensating for any irregularities in the framing or the floor. Once the shims are in place and the frame is level, you can then secure it confidently, ensuring that the door will operate smoothly and fit properly. This attention to detail is essential for achieving a professional finish in carpentry work.

Other options, such as ignoring the issue or installing the frame anyway, could lead to problems down the line, including improper functionality and increased maintenance needs. Sanding the frame edges is not applicable in this context, as it does not address the root cause of an unlevel frame and may further complicate the installation process.