Insulation of the facade using heat-insulating paint, features of the work, the advantages and disadvantages of liquid insulation, the technology of heat-insulating painting of walls. Warming the facade with paint is a good way to save money on heating your home. For this purpose, special substances are used that differ in their composition from conventional paints and varnishes. We will tell you about which paint is better for thermal insulation of walls, about its properties and application technology in this article.
Features of work on thermal insulation of the facade with paint
The thermal insulation properties of a paint having a water or acrylic base are given by special fillers that are part of it: perlite, fiberglass, ceramic microspheres or foam glass. Due to the possibility of uniform distribution of liquid material over the surface of the walls, it becomes easier to insulate hard-to-reach and embossed sections of the facade than when using tile insulation. Thick paint can replace several millimeters of conventional insulating material.
It is similar in consistency to a thick gray or white paste and can be diluted and applied to walls using a brush, roller or spray. The service life of the insulating paint coating can be 12-40 years. The temperature range of application of the material is quite extensive - from -70 ° C to + 260 ° C. The paint, which includes all the necessary components, does not allow moisture, steam to pass through and has a thermal conductivity of 0.053-0.082 W / m * K.
In addition to conserving heat in the house, the paint insulating coating has a number of other functions:
- Protection against cold penetration through walls, preventing the development of fungus, mold, condensation and corrosion;
- Strengthening the outer part of the facade and extending its service life;
- Energy saving, which allows you to save on heating and air conditioning of the premises of the house.
The principle of operation of ceramic paint for thermal insulation is as follows: hollow microspheres of ceramic filler, bonding with each other due to vacuum with an acrylic polymer, create a protective screen. The polymer base allows the microspheres to be distributed with such uniformity that the presence of cold bridges in the structure of the material is excluded. In addition, the heat-insulating effect is achieved by a wind barrier, obtained as a result of the hardening of a layer of paint on the facade.
Advantages and disadvantages of thermal insulation with facade paint
Thermal insulation with facade paint is suitable only outside the house, but at the same time it is able to compete with conventional insulation, since it has the following advantages:
- Coating resistance to ultraviolet rays and precipitation;
- Durability and low thermal conductivity;
- High adhesion, water resistance and corrosion resistance of the coating;
- The minimum amount of physical effort when carrying out work on thermal insulation;
- A high level of safety in case of fire - charring of dried paint for thermal insulation of walls occurs only at a temperature of + 260 ° C;
- Simple processing of sections of the facade that are difficult to access for insulation with other materials;
- Minimum load on the foundation - the paint coating weighs very little;
- Environmental safety - the material is absolutely neutral;
- Ease of repairing any damaged area of the paint thermal insulation coating.
The disadvantages of using paint insulation for the facade are the limited properties of the coating. In a heated, sealed and draft-proof room, such insulation of the outer walls can significantly increase the degree, but in most cases it is not the only and main insulation. At the same time, the price of paint for insulating walls from the outside is quite high, and its consumption is very significant.
Facade insulation technology with paint
Before painting the facade insulation, you need to select the material, calculate the required amount, prepare the wall surface, stock up on tools, construction equipment, and then you can proceed directly to the main work.
The choice of insulating paint
Effective insulation of the facade with paint is possible when it is applied to the walls in at least 2-3 layers. Liquid thermal insulation material should, after drying, have maximum vapor permeability and minimum water permeability.
To facilitate the choice of paint for facade insulation, you can familiarize yourself with the corresponding products of several popular manufacturers, find out the composition of their products, learn about the differences between them, the advantages of each and the disadvantages.
Below are the most famous brands of thermal insulation facade paints:
- Corund Facade … This paint copes well with the insulation of external walls, the minimum coating thickness is 1 mm. The material can withstand temperatures from -60 ° C to + 250 ° C, is sold in 20 l buckets or in cans of 3 and 10 kg. The cost of 10 kg of paint reaches $ 96.
- Astratek Facade … This painting material is used for thermal insulation of the facade, has a white color, which can be changed with the help of special dyes. The paint has a high viscosity, it is applied to the facade with a spatula or spray. The finished coating has good vapor permeability and water repellency. Its thickness is 1-3 mm, its service life is 15-30 years. Due to the absence of organic solvents in the composition, Astratek Facade paint is environmentally friendly. The price of 10 liters of material is $ 112.
- Bronya Facade … The uniqueness of this material lies in the fact that it is applied to the wall like ordinary paint, but after drying it works as a reliable thermal barrier. Bronya Facade forms a matte flexible surface with excellent thermophysical properties. The paint applied to the facade with a layer of 1 mm replaces mineral wool with a thickness of 60 mm in terms of efficiency, provides high protection against corrosion, eliminates condensation, protects the wall from the formation of mold and mildew. Due to the presence of a ceramic filler in the paint, it retains its activity at temperatures from -60 to + 200 ° C for 30 years. The reasonable price of ceramic paint for thermal insulation 420 rubles / l provides this material with increasing popularity.
The method of applying all paints depends on the scope of work. If the area of the facade is large, it is painted with a spray gun; a small surface can be painted with a roller and a brush.
When calculating the consumption of facade paint, the following should be considered:
- Base material: concrete, metal, expanded clay concrete, wood and others;
- Surface relief, paint structure and type;
- Estimated paint area and paint layer thickness;
- Weather conditions of work and the method of applying the material to the facade.
When painting 1 m2 the surface of the wall with a layer of 1 mm thick, the average consumption of liquid thermal insulation is 1 liter. If the facade has a relief, the paint consumption will increase by 15-35%. For external painting of the wall in calm weather, the material will need 2-3% less.
For a concrete facade, the recommended thickness of the paint layer is 1.5 mm, for aerated concrete, metal and brick - 2.5 mm, for a wooden one - 2 mm. The consumption of paint for wall insulation increases in proportion to the thickness of the coating.
Preparation of the facade surface for painting
In order for the heat-insulating paint on the facade not to peel off, its surface should be carefully prepared. The set of tools, without which the positive effect of the work will hardly be possible, should include rollers, paint brushes and a scraper. In addition, you need to stock up on a bucket and solvent.
Preparation of the surface for painting should begin with cleaning it. For this, you can use brushes with metal bristles and a scraper. Old paint, dust, dirt, traces of fungus, mold, corrosion and stains of various origins are subject to removal from the facade. After cleaning, the walls must be degreased and then allowed to dry on the treated surfaces.
The parts of the facade that are not planned to be painted must be protected from the insulating material getting on them with masking tape. Window and door panes should be covered with newspapers or plywood before painting. A good option for glass preservation is to use a fat mixture with added soap. Metal parts of the facade must be treated with an anti-corrosion primer before thermal insulation with paint.
Instructions for applying paint to the facade
After finishing the preparation of the facade surface, you can start priming and painting it. The primer for treating walls must be special - blocking the formation of stains and resins during the painting process. After the primer has completely dried, it is possible to apply heat-insulating paint to the facade in layers, giving each layer of the material time to dry.
The minimum air temperature at which fruitful work is possible is + 15 ° С. It is recommended to paint external surfaces in cloudy weather. This is necessary for their even drying. In the morning it is more convenient to paint the walls located on the west and north sides of the house, in the evening - on the east and south.
The application of thermal insulation paint to the facade can be done manually using brushes and a roller, or with a paint sprayer. In any case, it is necessary to ensure that it lies flat, and that the layer thickness is 0.4 mm.
When manually applying liquid thermal insulation to the facade, it is not necessary to dilute it, the paint should be thick. When using a spray gun, the acrylic-based material can be diluted with water to the desired consistency. Usually it is determined visually, it is only important to avoid the creation of thick layers of paint and its runoff over the painted surface.
When insulating the facade of a house with paint, it must be applied to the surface in eight layers. The total thickness of the thermal insulation upon completion of the work should be about 3.5 mm.
The quality of painting is determined by the absence of stripes, stains, insulation drips and grains on the finished surface. From a distance of 3 meters, the painted façade must have a perfect appearance.
How to apply thermal insulation paint to the facade - watch the video:
The cost price of thermal insulation of the facade with paint is much lower than other methods of insulation, since in this case the use of expensive tools and consumables is not required. Applying a liquid material to a wall surface is a fairly simple operation. For it to be successful, it is enough to take into account the features of the building and follow the correct technology for preparing and painting its walls. Good luck!
