This gap allows

According to construction standards, the gap between the wall of the building and the insulation should be more than 40 mm, although in different countries the size of this gap is allowed from 20 mm to 50 mm. This gap allows the air to pass freely between the wall and the facing material, dried the insulation if moisture came on it. So that the air does not blow out of the insulation, it is covered with a moisture -proof windbreaker film.