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I forgot to put an insulation between the inner wall and the plasterboard doubling. It is a stone house whose walls are more than 50 cm thick. What are the risks? Should I install ventilation grilles so that the air circulates between the internal stone wall and the partition of plasterboard or not. Last precision, the space between the wall and the partition sometimes reaches 20 cm even starting closest to the interior wall!

Forgetting the insulation... you just have not isolated your wall! A double-wall is a good solution to improve a little insulation of a wall. You might be able to repair this oversight by infusing insulation in bulk (it's a professional job, unless you can pour cork granules from the attic) into the building void. It is not essential to ventilate a double partition.

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