
So, to go a little bit more in detail, I have fixed a 3mm thick carpet to the 9 inch lime stone walls, then the 75 mm Rock Wool, after that is the 2.3/4 inch by 1.1/2 inch frame roughly in metric 70mm by 38 mm wooden frame which is not touching the rock wool, so between the rock wool and the plaster board there will be an air gap of 70 mm.
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