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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.

There is no way to cut drywall without making dust, but you can reduce the amount of dust and especially the dangerous airborne particles by using manual cutting tools. Using a utility knife to score and snap your drywall will minimize dust production, and a jab saw for cutting cutouts for boxes and fixtures will generate almost no airborne dust. Even if you use these methods, you should still wear a respirator and safety goggles to avoid damage to your lungs and eyes.

Drywall can be installed directly on ceiling joists. In fact, this method is common in many construction projects. Drywall sheets are attached to the joists using screws, ensuring a secure and stable installation. Before attaching the drywall, it's important to mark the joist locations on the ceiling, allowing for accurate screw placement. Proper spacing between screws and careful taping and mudding of joints are crucial to creating a smooth and flawless ceiling surface. If the joists are in good condition and level, installing drywall directly on them is a practical and efficient approach.

In most cases, plaster repair will improve your home’s energy efficiency because a solid barrier of the insulative material helps keep conditioned air inside your home. Major plaster repair jobs like repairing large cracks or crumbling sections of plaster or applying a skim coat might make a noticeable difference in your heating and cooling bills. Not only can plaster repairs improve efficiency, but they can also reduce strain on your HVAC equipment, potentially saving you money on maintenance and repairs.