Moisture regime of enclosing structures with different thickness of insulation layer

Abstract

Abstract Construction industry has different problems including the moisture regime of enclosing structures. If we want to protect an enclosing structure from the negative impact of moisture, we need to evaluate a moisture balance transfer. We used well-known graphical method to calculate the maximum wetting plane positions in three enclosing structures, which are represented the composite insulating systems with external plaster layers, aerated concrete bases and mineral wool insulations. These researching encloses differ only by thicknesses of insulation layers. It was found that the maximum wetting plane is located between the insulation layer and the external plaster layer. Moreover, when the indoor climate parameters change, the position of the maximum wetting plane does not change. However, it is determined that with a significant increase in the thickness of the insulation, the second maximum wetting plane appears inside the aerated concrete layer. This phenomenon was called as «overheating effect». To assess the position of the second maximum wetting plane we developed the criterion “relative displacement coordinate of maximum wetting plane” and obtained the graphic dependence of the introduced criterion and the thickness of the insulation.