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Yes, you can install drywall over plaster, but there are important factors to consider. While it can create a smooth, flat surface, it is often not the best approach. Installing drywall over plaster will increase the wall's thickness, which can cause issues with existing window and door frames that may no longer fit. You might also need to adjust power outlets to keep them accessible. A better, though more expensive, option is to remove the old plaster and lath entirely before installing new drywall. Drywalling directly over plaster seals in the old material, and if any problems arise later, you will need to remove both layers down to the structural beams for repairs. Given the potential complications, this job is best handled by professionals.

Furring strips, thin strips of wood or metal, are not always required for ceiling drywall installation. If the ceiling surface is even and in good condition, drywall can be directly attached to the ceiling joists using screws. However, furring strips become essential when dealing with irregular surfaces or when additional insulation or soundproofing is needed. They create a level substrate for attaching the drywall. Ultimately, the decision to use furring strips depends on the condition of the existing ceiling and the specific requirements of the project.

You should always hang drywall from the top down. Starting at the top makes it easier to create a straight, tight line between the ceiling and the wall. Any gaps that occur will be at the bottom, where they are easier to manage. You can either cut the bottom piece of drywall to fit the remaining space or cover the gap with baseboard trim. Additionally, starting at the top is physically easier, as you won't have to fit the top sheet into a tight space between the lower sheet and the ceiling, or try to balance the upper sheets on the lower ones while securing them.

Yes, walls on the top floor can be load-bearing if stacked on the floor’s foundation.