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I am currently renovating a two-sided buried stable to make an apartment. It has been drained because there is water infiltration and a slab that does not touch the walls. I would like to perform a dubbing that does not touch the walls. Here's the question: between walls and dubbing, should I ventilate or do I need to trap air?

The doubling must be independent of the load-bearing walls
Any insulation must be insensitive to moisture: preferably expanded polystyrene, extruded polystyrene, polyurethane foam
High and low ventilation should be provided at regular intervals
The material used for the lining must be sufficiently resistant to more or less permanent moisture: avoid standard plasterboard and even water-repellent. Prefers cement slabs or even concrete slabs of 50 mm if the volume allows it.

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