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We have a problem with "blown" plaster/paint on the inside of all exterior walls in a Victorian stone house converted into flats 4 yrs ago. Trouble is we are on the top (third) floor and any exterior remedial/inspection work would require scaffolding. Expensive. A surveyor has looked at it from the ground and has said stonework/pointing looks to be in good condition. All walls were replastered and painted during the conversions. Effected walls first turned brown and then bubbled. Any suggestions on cause and remedial work would be appreciated.

How many walls are effected and are they all external walls?

Are there any chimneys on these walls?

Is there good ventillation in the rooms?

Hello again. Seven walls - all exterior - have been affected. No ventilation in rooms other then when the windows are open. Thank you

In the first instance you need to ventillate.
Open windows are not enough because the time of year when you need ventillation the most in a flat is the time you need them closed.
This is the cheapest option to try.
stadium do a black hole ventillator which has a wind baffle to iliminate the through draught in inclement weather.
Most contractors will install them for around 100 quid each.
These are quick to install,no after install servicing and do not require make good or redecorating.
In my experiance most landlords foot the bill as i can be derogitory to the inernal decoration and health of the tennant or lease holder.
But dont forget that this will puncture the external fabric of the walll and that is owned by whoever actually owns the building....its a mine field mate... good luck

Many thanks for your information - appreciated. Will certainly look into it.