The article presents the results of a study of the combined effect of plaster coatings and facade paints on the humidity regime in the walls made of aerated concrete brands D400 and D600. The influence of the characteristics of paints and plaster coatings on the temperature of the beginning of condensation is estimated. The position of the planes in which condensate begins to precipitate for all the structures under consideration is determined. It is found that in enclosing structures using cement-slag plaster, the temperature of the beginning of condensation is higher than the temperature of the beginning of condensation in enclosures in which cement-vermiculite plaster is used. When using VAK "Silicate" and VAK "Silicon 2" facade paints, which are distinguished by the highest vapor permeability, this difference is maximal and amounts to 2 C and 2.3 C, respectively. When using VAK "Tsokol" and VAK "Acryl 1" facade paints, this difference is minimal and amounts to 0.2 C and 0.5 C, respectively. It has been established that when using cement-slag plaster and paints VAK "Tsokol", VAK "Acryl 1", VAK "Acryl 2", VAK "Silicone 1", VAK "Silicone 2", moisture condensation occurs at the border of aerated concrete-external finish, which creates the danger of detachment of the plaster composition from aerated concrete. These structures are also characterized by rather high temperatures of the onset of condensation from -5.4 °C and above. When using VAK "Silicate" paint and cement-slag plaster, moisture condensation begins in the thickness of aerated concrete, which is more favorable for the enclosing structure. Recommendations are given on the choice of the type of paint and the type of plaster composition for walls made of aerated concrete grades D400, D600.