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thanks very much for your advice on this, the roof tiles have a breathable membraine circa 1985 so will I still need to put in vent tiles at the ridge if using foil backed kingspan between the rafters? I definately dont want to bodge this up, do the job once & get it right. Will install...

Hi, thanks for reading this, Just boarded out loft floor for a new hobby room, want to insulate roof & sort out the 2 end walls. Got 9.5cm deep roof rafters and was thinking 50mm kingspan polystyrene (or similar) up between all the rafters leaving 45mm for ventilation between kingspan and the...