Influence of protective and decorative coatings based on sol-silicate paints on the moisture regime of external walls of buildings

Abstract

The object of research is the humidity regime in external enclosing structures coated with paints with different vapor permeability: ash-silicate, silicate, acrylic and silicone. The purpose of the research is to evaluate the effect of a paint-and-varnish coating based on the developed sol-silicate paint on the change in the moisture regime of the wall, depending on the type of construction. Comparison of the effectiveness of the use of various paints and varnishes is carried out. The properties of the developed sol-silicate paint for finishing the walls of buildings are described. The results of calculating the influence of paints and varnishes on the humidity regime in the walls are carried out. To assess the humidity regime, a technique was used based on the determination of the outside air temperature, with a decrease to which condensation begins to fall out in the walls. This technique makes it possible to compare with high accuracy the humidity conditions in various enclosing structures. Comparison of the humidity regime in the walls of various designs is presented: aerated concrete (from blocks of grades D400, D600), brick, expanded clay concrete. In brick and expanded clay enclosing structures, the influence of the type of insulation (mineral wool mats, expanded polystyrene) on the humidity regime in the walls was also assessed. In the course of research, the thickness of the paint layer varied from 0.2 to 0.6 mm. According to the results of the research carried out in the article, it is shown that when using sol-silicate paint in enclosing structures, the temperature of the onset of condensation and the likelihood of condensation are reduced in comparison with acrylic, silicate and silicone paints. Recommendations are given on the choice of the type of facade paint, taking into account the humidity regime inside the fences of various designs.