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We have a stone house. Stone wall 80 cm thick, and a double platrous brick partition with a space between the wall and the brick ranging from 2 cm to 7 cm. This space, in which the outside air rushes through the roof, serves to ventilate the stone wall and thus to evacuate moisture that could rise from the ground. if so what can be done to isolate, is it not possible to put cellulose wadding in this void to block the moisture then to expose to the merule?

You can consider this solution without risk, provided it is implemented by a professional. The technique is developed in particular by SOPREMA, with cellulose wadding. You will find precise information on the site of our colleague BATIGUIDE.

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