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Once dried, Venetian plaster becomes a rock-like substance that’s durable and excellent at resisting damage. If properly sealed to resist moisture and maintained, Venetian plaster should last for at least a decade but potentially as long as a lifetime. Thanks to its mineral content, it can also develop a patina.

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.

Common causes of ceiling cracks along drywall seams include poor drywall installation techniques, structural issues, truss uplift, and foundation problems. Temperature and humidity also play major roles in ceiling cracks flush with the wall. As the drywall shrinks and expands from major temperature changes or extreme humidity shifts, this can cause the drywall to crack.

Common causes include water leaks, settling, and impact. Address underlying issues to prevent recurring damage.