I'm in a house where the plaster was done in an old style. Not lath-and-plaster as one of the tags suggests but simply plaster mixed in with hay or something fibrous on top of brick.
With the humidity this has gradually started to turn to dust in two places. Downstairs this is happening in the corner of a wall and, upstairs, a piece of ceiling just under the attic has practically fallen. This can become a problem downstairs as the red bricks underneath could also soak up humidity and falling to eventually degrade too.
It was suggested that I use some tinfoil (?) then replaster but this sounds weird. How could I redo this properly? Get rid of all the plaster that's loose and put some new plaster in or use gyproc panels instead?