# Humidity Conditions of Aerated Concrete Walls Depending on the Type of Finishing Coating
## 3 Results  
Let us determine the temperature at the beginning of the condensation for all 48 considered external fences. To do this, we consistently use Formulas (1)-(5). In this article, we present the calculations summarized in Table 3. These calculations were performed for an external enclosing structure located in the city of Voronezh, using aerated concrete at the grade D400. Cement-sand plaster with a density of 1800 kg/m\({}^{3}\) was used as an exterior finish in the structure. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Fencing Layers**} & **Distance from the** & \multirow{2}{*}{**\(\mathbf{R}_{xiv}^{t}\)****m**\({}^{2}\cdot\)**\({}^{\circ}\)**C/W**} & \multirow{2}{*}{**\(\tau_{xiiv}\)****\({}^{\circ}\)**C**} & \multirow{2}{*}{**\(E_{xi}\)**, Pa**} & \multicolumn{2}{c}{\(\mathbf{R}_{xiv}^{t}\)****} & \multirow{2}{*}{**\(e_{xi}\)**, Pa**} & \multirow{2}{*}{**\(E_{xi}\)**-\(e_{xi}\)**, Pa**} \\  & **Inner Surface**, **cm** & & & & & \\ \hline \hline \multirow{2}{*}{\begin{tabular}{c} Inner surface of \\ the wall \\ \end{tabular} } & 0 & 0.115 & 19.13 & 2214 & 0.027 & 1273.8 & 940.6 \\ \hline \hline \multirow{2}{*}{\
\begin{tabular}{c} Lime–slag plaster \\ \end{tabular} } & 1 & 0.136 & 18.97 & 2192 & 0.098 & 1243.0 & 949.4 \\ \hline \hline \multirow{2}{*}{
\begin{tabular}{c} Aerated concrete \\ D400 \\ \end{tabular} } & 2 & 0.208 & 18.43 & 2120 & 0.142 & 1224.3 & 895.5 \\ \cline{1-1} \cline{2-6}  & 3 & 0.279 & 17.90 & 2049 & 0.185 & 1205.5 & 843.8 \\ \cline{1-1} \cline{2-6}  & 4 & 0.351 & 17.36 & 1981 & 0.228 & 1186.8 & 794.1 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Thickness of the aerated concrete layer, m.  
The distribution of the water vapor pressure, at an outdoor temperature of \(t_{out}=-3.1\), equal to the temperature at the beginning of the condensation \(t_{b.c. }\), for this outer wall, is presented in Figure 3.  
The findings from the investigations, conducted to identify the temperature at which condensation begins (\(t_{b.c. }\)) for each of the examined 48 enclosed structures, are displayed in Table 4.  
It has been observed that as the thickness of aerated concrete increases, the \(t_{b.c. }\) decreases, except for the enclosing structure in the city of Vorkuta using the developed DBM as an exterior finish. Additionally, it has been found that higher densities of aerated concrete and outer finishing coatings result in lower \(t_{b.c.}\). The amount of condensed moisture that accumulates in the fence during the winter period was determined by comparing the \(t_{b.c. }\) with the average temperature for each month from October to April. If the \(t_{b.c. }\) for a specific fence variant exceeds the average monthly temperature for any given month, condensate will form during that month. Let us compare the temperature at the onset of condensation, \(t_{b.c. }\), for the outer walls of a building located in the city of Voronezh with the average monthly temperatures (Figure 4). \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Fencing Layers** & **Distance from the Inner Surface, cm** & \(R_{\text{xir}}^{t}\)**m\({}^{2.\,\circ}\)C/W** & \(\tau_{\text{xir}}\), \({}^{\circ}\)  
It has been established that conditions for the formation of condensate will not be created in walls made of D600 grade aerated concrete blocks. In the walls made of aerated concrete blocks of grades D350 and D400, plastered with a cement-sand composition or Knauf GRUNBAND, condensation will occur at the average monthly temperatures for December, January, and February (Figure 4, curves 1,2). In the walls of aerated concrete blocks made of the D500 grade, plastered with a cement-sand composition, condensation will occur at the average monthly temperatures for January and February. In the walls of aerated concrete blocks made of the D500 grade, plastered with Knauf GRUNBAND, conditions for the formation of condensate will not be created.