Sagging plaster means the plaster has come loose from the wooden lath; ceiling joist sagging means the entire ceiling has a slight, convex downward bulge.

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Plaster walls, though cracked, don't suffer from the same set of gravity-borne problems as do ceilings. Walls can be repaired, and the repairs should last a long while.

Q. A painter recently repaired our unheated vestibule ceiling by applying a thin coat of plaster over the entire surface. He gave the same treatment to the walls. A big piece of the plaster has ...