No, drywall should not rest directly on the floor when installing it in walls or ceilings. Proper drywall installation requires a small gap between the bottom edge of the drywall and the floor or subfloor. This gap allows for a few important reasons:
Avoid moisture damage: Keeping the drywall slightly elevated above the floor helps prevent water or moisture from wicking up into the drywall in case of spills, leaks, or moisture rising from the floor.
Accommodate for flooring materials: Leaving a gap allows space for various flooring materials such as carpets, hardwood, tiles, or laminate to be installed later. If the drywall were installed flush with the floor, it would be challenging to fit these materials underneath the drywall, resulting in a less clean and professional-looking finish.
Reduce the risk of damage: Having a gap between the drywall and floor can prevent damage from occurring due to slight movements or settling of the floor.
To maintain the gap during installation, use shims or other leveling materials along the bottom edge of the drywall sheets. This ensures a consistent gap along the length of the wall or ceiling. After installation, the gap can be concealed with baseboards or other floor trim.
Remember to follow local building codes and best practices for drywall installation in your area to ensure a safe and professional outcome. If you're uncertain about the installation process, it's always a good idea to consult with a professional contractor or drywall installer.