Taking advantage of special paints for facades could be a savvy option to protect protect the exterior from environmental impact and prolong the lifespan of the concrete surface. The option is appreciated by engineers: not only they paint facades of buildings, but also utilise this painting method to protect concrete structures from moisture and biological factors. When choosing paint for concrete for the exterior you need to take into consideration their properties, which must be above reproach. Mentioned below are the aspects you should consider when choosing the product.
Moisture. The paint should not pass moisture into the material of the walls.
Fire resistance. In case of fire, the paint should not be ignited and contribute to the spread of fire.
Adhesion to the concrete, an ability of materials to adhere to the surface by means of intermolecular effects. With a low degree of adhesion to concrete paint will peel off and get separated from the concrete surface.
Light resistance. It is the quality of the paint shows its ability to retain the original color when exposed to ultraviolet rays.
Resistance to changes in temperature. This feature of the painting material characterises its ability to resist changes in temperature. The temperature range of outdoor paints for concrete are large enough: from -50° to +50° C. Such companies as Britannia, standing out from the crowd with innovative exterior wall coatings solutions, go even further and offer the products that stand out -65°.
Water vapor permeability. The paint provides a surface layer of the concrete facade, thus allowing the passage formed inside a pair of premises. It should have a zero water absorption and maximum vapor permeability.
Consumption. This aspect stands for the amount of paint needed to paint 1 square meter of the surface. The concept of coverage indicates how thin coat paint should be to make a smooth color transitions from one color to another.
Resistance to mechanical damage and biological effects. The paint on the surface should be strong and not be damaged by impact and shearing.
Painted surfaces should be resistant to soiling and easy to clean. The denser the ink composition, the worse it is exposed to contamination. Its quality is defined by its resistance to mold and fungal attack, and ideally, the paint should contain antibacterial components in its composition.
According to the method of solubility distinguished are water-soluble coatings and organic solvent coatings.
Water-soluble coatings are based on synthetic resins; they are comprised of pigments, additives and fillers. In this case water is used as binder. Use these types of paints is reasonable when the outdoor temperature is above 0°C. Soluble paints have all of the above properties; the average time of service of painted surfaces equals 12 years.
Coatings that contain organic solvents include such products as white spirit or xylene. To utilise these paints the temperatures should rise above 0°C as well, plus they can be used at a humidity level of 80%. The drawback of these paints is that they are flammable and toxic; therefore, they are less in demand among buyers as compared with water-soluble products.