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OK. After some internet research - looks like I have a cold roof design so 50mm celotex with 50mm ventilation space is the way forward. As I want the celotex level with the bottom of the rafters and fulsh against the plaster board, where does the lighting wiring run? Can it run in the cold...

Hi, Hope someone can help me. I have a garage that is being rebuilt as a playroom and about to insulate roof. The roof construction form top down is: Coroline Breathable Membrane OSB /Sterling Board Deck Rafters If I insulate from the underneath between the rafters do I need to...