I had a leaky flat roof in the living room ext and I have decided to re-plasterboard the whole area about 10ft x 8ft. I will put the board up then get the plasterer who lives near by to skim it.
I am a little concerned that there is virtually no air gap between the insulalion and the roof decking. It was suggested that if I put foil backed up then I would get less possibility of condensation due to moisture migrating through the PB. If that is true would it be worth considering putting up moisture resistant PB?