Abstract:
The main result of the conducted research is the establishment of the fact of variability
of the vapor permeability coefficient of material layers in multilayer external walls during the year
in accordance with the change in the relative humidity of air in the pores of materials during
operational influences and testing of fragments of external walls in natural and laboratory
conditions, it was established that the relative humidity of air in the pores of material layers of
external walls varies throughout the year in the range from 20 to 100%.