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Afternoon, I'd like to insulate roof in the garage. I know already that I have to look at cold roof solution. I know that there should be ventilation between roof board (wooden board with felt on top) and insulation. But I cannot have any ventilation in between, as beams are done across the garage (if it makes sense). So my question is - shall I just buy some polystyrene and stick it on the wooden board from the bottom - or should I pack cavity with wool and stick plasterboard. This would make sandwich - roof board/insulation/plasterboard Last thing which I want is to do something wrong, have condensation problem, which would lead to rotten roof. I will upload some photos later.