Which floor is it generally good practice to begin door installation?

Beginning door installation on the top floor is considered a good practice primarily due to the gravitational forces involved in installation and the potential for error management. When you start at the top, you can ensure that the openings and structuring are aligned and correctly measured as you progress downwards. This approach minimizes the risk of errors that are harder to rectify if they occur on lower levels after the top has already been installed.

Additionally, starting at the top allows for a more efficient workflow, as any adjustments or issues encountered at that height can be dealt with immediately before moving to the lower levels. If a problem is discovered while installing on a lower floor, it can necessitate revisiting the work done above, which is not only inefficient but may also complicate alignment and fitting further down.

This practice is common in various construction projects, where working from the highest point allows for gravity to assist in the installation process, and reduces the risk of needing to carry heavy materials up multiple floors repeatedly, saving both time and labor.