Of magnitude reduces its

Anti -corrosion and antifungal treatment increases the life of the input steel doors, but does not solve the problem of cold and damp. Moreover, these issues are closely related to each other, since any thickness of the heat insulator layer by an order of magnitude reduces its heat -protective properties when moisture enters it. And since moisture can penetrate into thermal insulation not only from the street, but also from the side of the room, it is necessary to provide for the possibility of directed waterproofing (as in hinged ventilated facades), blocking moisture from the street, but does not prevent the exit from the inside. This is provided by waterproofing membranes laid between the steel sheet and the heat -insulating layer.