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Thanks for the feedback I have a warm roof and the airspace is 200mm, which is the depth of the joists. Are you saying that I should fill this airspace with the insulation and do away with the insulation in the upper part of the warm roof. This would get ride of the need to use 150mm+ screws to...

I have a 36 sqm GRP warm flat roof that bangs when there is a large temperature variation during the day. It is worse in the evenings when the temperature is cooling and in the mornings when the temperature is increasing. I notice that there were threads running on this topic in several years...