insulating an unventilated flat roof

Joined
9 Dec 2013
Messages
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Location
Somerset
Country
United Kingdom
just had a new unventilated GRP flat roof fitted, what's the best way to insulate this without getting any damp or condensation problems? I have exposed rafters which are 4'' deep and 14'' apart. I want to finish it with plasterboard/skim and down lights.
 
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