The article presents the technical analysis of the structure and physical characteristics influence of various plastering coverings on on moisture conditions of AAC-blocks homogeneous walls. The diagrams of partial (maximum and actual) pressure distributions of water steam along the thickness of the tested homogeneous outside walls are provided. Calculations and diagrams were done for both the coldest month of the year and the coldest five-days period, i.e. under the worst climate conditions. The essential patterns of the influence of plastering covering charactristics (thickness, density, vapor permiability coefficient) on humidity accumulation processes in walls are determined. Practical recommendations for finishing of AAC-blocks walls to protect them from excessive moistening can also be found in the research.