The steam -barrier isolation is designed to eliminate the entry of water vapor into the heat insulator layer. To do this, mainly until recently, waterproofing reinforced films were used, which are vapor barrier microperphyted on the entire surface with conical punctures. Such films allow you to pass steam and do not pass water. The cone -shaped perforation of waterproofing films is determined by the strict rule regarding which side they should be laid in contrast to the currently used new types of vapor barrier films that can be laid by any side.
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Special materials for the formation of vapor barrier are equipped with a layer of duralumin foil. This allows you to increase not only thermal insulation parameters of the entire insulation layer, but also increases the fire resistance of vapor barrier. When installing between a layer of the heat insulator and such a film, it is necessary to leave a gap of about twenty millimeters in size, which should provide ventilation. The need for a ventilated gap is justified by the fact that, firstly, the vapor permeability of the insulating films is still insufficient for the complete removal of water vapor from thermal insulation, since there is always a certain amount of moisture in thermal insulation. In thermal insulation, moisture accumulates during its storage and transportation, not assuming that it is not possible to make a vapor barrier layer throughout the area completely sealed. The choice of insulating material depends on its compatibility with various roofing materials. It is also necessary to take into account the fact that moisture can also fall into the attic space from the street.