A: It depends on the type and size of the crack. Hairline cracks take only a little patching plaster. Larger cracks require reinforcement with mesh tape. Cracks larger still, where the plaster keys ...

There are two kinds of cracks in old lath and plaster walls. Both can be repaired, but one is a much more serious problem. By Ronda Kaysen Q: Our Gramercy co-op was built in 1929. The thick plaster ...