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That it is the best solution to isolate the roof of my garage (simple volige + tile for the moment). Thanks in advance Julien

You do not specify the nature of your frame but one can imagine that it is about beams supporting rafters on which nails are nailed. The simplest thing would be to stall insulating panels (mineral wool) semi-rigid between the rafters, plus skewer a cross layer of glass wool in roll on lines fixed on the rafters. A metal frame will be able to receive plasterboard for a good finish. Always leave an air gap of 2 cm between the floor and the insulation.

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