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You can plaster over an old plaster ceiling if the existing plaster is in good condition. Ensure the surface is clean, free of loose material, and roughened slightly to promote adhesion. Applying a bonding agent or primer can further enhance adhesion. Proper preparation ensures a smooth and long-lasting plaster finish.

Plaster walls last 30 to 70 years, although expertly applied and well-maintained plaster can last for centuries. That’s why it’s important to leave plaster installation to a pro, treat cracks as needed, and have a pro inspect any concerning cracks as soon as possible. These efforts can greatly extend the life of your plaster walls for decades to come.

It is possible to apply plaster on the interior or exterior of your home, but we don’t recommend it. Plaster is easy to apply in theory, but in reality, it can be a challenging material to work with, and it’s difficult to get the finished product to look clean, even, and smooth. Many DIYers end up calling in a professional afterward to touch up the area or even redo it entirely because of mistakes they made in the process. Hiring a plaster pro will cost more, but it’s usually the best option to achieve high-quality results.

The short answer is yes, a sagging plaster ceiling is dangerous. Sagging plaster on a wall is something you should fix immediately, but it isn’t a major concern. If the same type of sagging occurs on a ceiling, however, you could be in danger of your ceiling falling in large chunks. When plaster sags, it loses its strength and ability to hold itself up. The bonds that hold it together are strong, though, so if a sagging area falls, it will take large pieces down with it.