TECHNOLOGY OF PRODUCTION OF MALAR WORKS.5. Facade decoration

Facade finishes include a variety of surfaces, the properties of these surfaces are crucial when choosing paint. It is also necessary to take into account the harsh operating conditions, the effects of salts, the temperature difference from +40 ° C to -40 ° C. It is necessary to take special care in painting the buildings of the old building, in which a multitude of paint layers repeatedly applied prevents moisture from reaching the plaster layer. As a result, moisture remains between the layer of plaster and the paint film, which simultaneously leads to a weakening of the plaster and deterioration of the properties of the paint film: peeling or cracking in the cold in winter. Therefore, it is necessary to completely remove the old paint before painting the surfaces and use systems that are open for the penetration of water vapor.

For an inorganic base (untreated, previously painted with silicate or cement paints), the best choice is to use silicate paint, which is also the most modern and effective for covering facades. Immediately after applying the paint to the surface, a chemical reaction begins, the paint penetrates deep into the mineral base, while slightly changing the color of the stone. After the paint dries, no film forms on the surface, which provides excellent results on water vapor permeability. Silicate paints can be applied on unfinished concrete surfaces, surfaces with a lime (chalk) coating; oil, alkyd and latex coatings are not allowed on the coatings. If necessary, pre-level the surface of the applied silicate primer.

For an organic base, emulsion silicone paint may be recommended, which is relatively open to diffusion during use. An integral element of such acrylic-latex paints is siloxane, which, being a paint binder, significantly improves its water vapor permeability characteristics and enhances the resistance of the coating to water and dirt. The paint has one-sided moisture permeability, allows the building to "breathe", protects the surface from destruction. Primer for the treatment of new surfaces should also be based on siloxane.

Often on the surface of the concrete salt occurs. Salts are carried out with moisture and appear on the surface of the concrete in the form of white spots or plaque after painting. The presence of salts indicates the movement of moisture and plaque may form again if the causes of this phenomenon are not eliminated. This movement of moisture can also cause paint to peel off. In addition, the penetration of moisture into the concrete leads to the formation of cracks due to freezing and expansion of water in the winter and the appearance of rust stains on the reinforcing steel. For such constructions, special acrylic-based facade paints are recommended.

Before painting the brick walls, it is necessary to assess the humidity of the facade, especially in the window cover area. It is important to check the joints of the masonry, and if necessary, clean and repair the individual seams to prevent the ingress of moisture. The paint must be highly resistant to alkalis. For brick walls, it is possible to recommend a front silicate paint or paint based on siloxane.

For wooden facades, the paint should include components to protect the wood from mold, blue and fungus. Primer with the same components of the structure must be treated. For the finishing layer, it is necessary to use facade acrylic-latex paint made specifically for wood and metal surfaces. Careful preparation of facades, their priming and painting can ensure the operation of the facade for 7 ... 10 years.