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Bathroom ceiling flood damage
A flood from upstairs flat bathroom in purpose built block (old flats built in the 30s)
Caused plaster ceiling to completely mould over and almost completely black from mould. This leak had continued for some weeks or even months so the water had spread extensively.
Just as for daves question I wanted to know the best course of action with minimum disruption as the flat is rented out.
Would it be possible to treat the plaster and decorate over after scrubbing off the mould, the plaster does not appeared to be bowed or falling off bust just very unsightly.
the ceiling is not plasterboard but fixed to concrete above (maybe with lathes)
I have suffered leaks from the upstairs flat before and it is not unlikely that there may be further recurrence. Help!
If plaster is sound (try pushing it up with fingers), then wipe with proprietory algicide, ensure thoroughly dry, paint with stainblock (Zinsser range is good) then standard emulsion or Classidur stain blocking paint. If re-occurance is likely then consider a fungicidal paint.
Answered 3rd Sep 2012
You have an infestation of mould. Very difficult to eradicate. The best course of action is to remove the ceiling, insulate if you have condensation and replace with aqua or cement boards which do not rot. My limited experience with fungicidal paint has left me unimpressed. Black toxic mould growing indoors is hazardous and a serious health risk not to be taken lightly.
Answered 17th Jul 2014