a gap should be made using ventilation slats;

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If the beams create a flat surface, then the vapor barrier should be attached to the wooden slats. This will create ventilation.

Vapor barrier inside the house:

material is attached to the slats;
The next step is to build a frame base for the insulation.
after laying the insulation, the water barrier is fixed;
The last stage is finishing.
When laying vapor barrier material in a frame house, you need gcash data follow these rules:

use membranes to create a ventilation layer;
vapor barrier installation is not done on both sides.
The material is secured with a stapler and the borders are sewn with tape.

Is additional protection needed?
In a wooden house, additional protection is not required. But in frame buildings, such material as hydro-, wind protection is applicable. It is fixed to the external finish. After that, OSB, thermal insulation, vapor barrier and finishing are applied.

Is it possible to lay several layers?
There is no need for this, because the vapor barrier material is created in such a way that it fully performs its functions. In addition, in some cases, in addition to vapor barrier, additional materials are used to protect the insulation and walls (wind protection, waterproofing).

Attention. Some types of membranes are made of several layers. Using this material will provide additional protection for walls in damp rooms.

How difficult is it to make a vapor barrier with your own hands