plaster board moisture content

Hello, I'm new to this forum so hopefully this is the most appropriate place for this thread! I'm looking to buy a top floor flat, my only concern is some dark marks on most of the walls (internal and external facing) and ceilings. The external facing walls seem to have marks that correspond to...

hello all having a bit of a problem with a newly plastered ceiling, every joint has opened up hairlines down the board's length and some wider ones on the width joints. The ceiling screwed up tight (no popped heads) fibre taped every joint tapered edge boards 2 coats of multi 2 separate mixes...