Decorative plaster called "bark beetle" is now perhaps the most popular type of facade decoration. You can see it both on private houses and on public buildings, and in a variety of versions. In general, the application of decorative plaster bark beetle is distinguished by a simple technology, but there are certain nuances, without which it will not work to get the desired texture. What are these nuances, and how to independently learn such a finish, we will consider in detail in our article.
Decorative plaster "bark beetle"
Such The material got its name because of the pattern that is obtained during the processing of the coating: the texture resembles wood worn out by bark beetles.
With proper application, this coating looks very attractive and aesthetically pleasing, but if you make a mistake, and all decorativeness is lost.
An example of plaster "bark beetle"
The creation of a characteristic pattern is provided by small hard granules contained in the plaster mixture. Their size varies from 1 to 3.5 millimeters, and the larger the grain, the more expressive the texture of the coating. Bark beetle plaster is made on a gypsum, cement and acrylic base, and marble or mineral chips act as a filler.
Acrylic compounds go on sale ready-to-use, gypsum - in the form of a dry mix. As a rule, they are all white, but can be tinted during the mixing process, as well as painted after being applied to the surface with facade paints.
Structural pattern of "bark beetle" plaster
Main characteristics of the material:
You can buy the material in any hardware store, and for a very reasonable price. As for the disadvantages: the application process requires great care and does not tolerate haste.
The pattern is very easy to smear with an extra movement of the tool, as a result of which, instead of cute grooves, you get the usual rough scratches on the surface of the plaster.
Example of finishing the facade with "bark beetle"
Plaster " bark beetle "produces a huge number of manufacturers, but you need to focus not on brands, but on the type of composition, its granularity, and the pot life of the solution. The grain size is the most important parameter, since it is it that sets the texture of the material and affects its consumption. The thickness of the plaster layer should be equal to the size of the filler granules, that is, the larger the granularity, the thicker the layer, which means the higher the consumption.
The next criterion is the type of composition.
Ready-made plasters save time, are more plastic and easy to apply, due to the content of special additives, but at the same time they are more expensive than dry mixes and cannot be stored. If you did not have time to use the entire volume of the plaster, the remainder will have to be thrown away - the frozen solution is unsuitable for work.
Decorative acrylic plaster of "bark beetle" texture, ready-made
Dry mixes are cheaper, they can be prepared in the volume that is needed, the remainder of the dry powder is perfectly stored in a sealed package. The only difficulty here can be the preparation of the solution, but if you follow the instructions exactly, then the kneading process will not cause any difficulties.
The best manufacturers of facade plasters
Comparative table of plaster compositions "bark beetle" of various manufacturers.
Ceresit CT 35
| Dry mix based on cement with mineral filler. Available in 2 fractions - 2.5 mm and 3.5 mm. The color palette includes, in addition to white, 7 pastel shades. |
The consumption rate is 2.5-4 kg / m2. Drying time 1 day, mortar setting time - 60 minutes. Packaged in bags of 25 kg
|From 670 rubles. / bag|
Ceresit CT 175
| Ready-made composition based on silicone resin . |
.. The color palette includes 200 different shades. The grain size of the filler is 2 mm. The consumption rate is 2.
7 kg / m2. Packaged in buckets of 25 kg
|From 2590 rubles. / bucket|
| Dry cement mixture with mineral granules two fractions - 1.5 mm and 2.5 mm, white. |
The consumption rate is 1.5-3.5 kg / m2. The mixture is available in white and beige. The pot life of the solution is 3 hours.
Packaged in bags of 25 kg
|From 300 rubles. / bag|
| Ready-made compound on acrylic binder. The grain size of the filler is 2 and 3 mm. The consumption rate of the mixture is 2.3-3. |
8 kg / m2. The main color is white, suitable for tinting. Packing - buckets of 25 kg
|From 2850 rubles. / bucket|
| Base - white cement, filler - dolomite chit. Available in two fractions - 1. |
5 mm and 2 mm. Viability of the solution is 2 hours, the consumption rate is 2-2.5 kg / m2.Packaged in bags of 25 kg
|From 465 rubles. / bag|
UNIS Bark beetle-Decor
| White cement-based composition , filler - marble flour. |
Available in 2 fractions - 1.5 mm and 3 mm. Consumption rate from 5 to 6.5 kg / m2. Drying time is from 2 to 3 days, pot life of the solution is 1 hour.
The main color is white, packing - 25 kg bags
|From 450 rubles. / bag|
| Cement dry mix, with mineral granules, available in 5 fractions - 1, 1.5, 2, 2.5, 3 mm. Colors - paintable white, super white and gray. |
The consumption rate is 1.5-3.3 kg / m2. It takes 2 days to dry, the pot life of the solution is 1 hour. Packaged in bags of 25 kg
| From 395 rubles. |
| Ready-made composition on silicone resins with mineral filler. Available in two fractions - 2 mm and 3 mm. The consumption rate of the mixture is from 2.8 to 3.9 kg / m2. |
Packing - bucket 25 kg
|From 4630 rubles. / bucket|
| Type of plaster - dry mix, filler - marble chips. Available in 3 fractions: 3.5 mm, 2.5 mm, 1. |
5 mm. The main color is white, suitable for tinting. Drying time is a day, mortar setting time is 3 hours. Consumption per m2 - from 2 to 4 kg. The service life of the coating is 10 years.
Packaged in bags of 25 kg
|From 580 rubles. / bag| Decorative plaster bark beetle
The process of applying a decorative coating "bark beetle" consists of two main stages: distributing the mixture over the surface and forming a pattern with a tool. But before that, it is required to carefully prepare the base, because the strength of adhesion of the plaster to the base and, as a result, the durability of the finish depend on this.
Decorative plaster should only be applied on dense and even surfaces that are not subject to shrinkage. Walls of brick, concrete, cinder block are best suited for this, but for wooden houses it is preferable to choose other finishing methods.
The basis for decorative plaster is usually a leveling cement plaster, which is applied to the walls themselves or to a layer of insulation. In some cases, the bark beetle can be applied over the facade paint.
Preparing the facade for finishing
So, first they clean the dust and dirt, remove oil stains with a solvent, cleanse and treat with an antiseptic areas affected by the fungus. All grooves, cracks and chips are sealed with cement mortar. Next, take a rule with a length of at least 2 m, and apply it to the wall in different places to check if there are deviations from the plane.
If the deviations are more than 2 mm, additional leveling with plaster or putty mixture will be required.
Alignment of the facade walls is carried out if necessary
The facade painted with oil paint should be thoroughly sanded with coarse-grained emery paper over the entire area, provided that the paint is adhered firmly and has no defects.
After the base has been cleaned and leveled, it is primed. Some plasterers argue that it is not necessary to prime external concrete and cement-sand bases, and just moisten the surface with water before applying the plaster. This approach is incorrect, and leads to a reduction in the life of the coating, because it is the primer that strengthens the upper layers of the base and provides high-quality adhesion of materials.
It is desirable to use a primer of the same brand as the plaster itself. As a rule, manufacturers indicate on the packaging of the "bark beetle" which primer is preferable to use.
Ceresit CT 16. Primer for decorative plasters
Advice. For priming the surface, it is recommended to use strengthening compounds with quartz sand.
They penetrate deep into the pores of the substrate, impart water-repellent properties, maximize adhesion. If you plan to use tinted plaster, then the soil should also be tinted to match the finish so that the base does not shine through after the patterns are formed.
Apply the primer with a roller or brush, evenly working the walls from top to bottom. This should be done in dry warm weather, on a dry surface. For a solid base, one layer is sufficient, for a dusty base - 2 layers.
After this, the walls should dry completely, on average, it takes 4 to 6 hours to dry.
Priming the facade
The plaster can now be applied.
When choosing a dry mix, you need to pay special attention to the preparation of the solution. If you still do not have experience in plastering work, do the batch in small portions, since the plaster dries quickly, and you cannot dilute it with water. Read the instructions on the package, be sure to remember the proportions of water and dry powder, because the quality of the solution depends on this.
Step 1. Take a mixing container (a regular 10-liter bucket will do), pour the specified amount of water, the temperature of which should be within 15-20 ° C, and gradually introduce the dry mixture ... On average, 1 kg of mixture requires 200-250 ml of water.
Gradually introduce the dry mixture into a container with water
Step 2. Stirring is performed with a drill with a nozzle, since it is difficult to achieve a uniform consistency manually. You need to stir at a low speed, completely immersing the mixer in the solution so that air bubbles do not form.
Stir the mixture with a drill with a nozzle
Step 3. After 2-3 minutes, when the solution becomes pasty and homogeneous, the mixer should be turned off and the plaster should be allowed to brew for 5 minutes.
Then mix again and proceed to application.
If you need to give the plaster a certain color, you should purchase the color of the desired shade in advance and add it while mixing the solution ... In this case, stir especially thoroughly so that all the pigment dissolves, and there are no streaks or individual inclusions left.
Manufacturers recommend tinting only ready-made compounds on an acrylic and silicone base, and painting dry mix plasters with facade paints after drying.
Tinting decorative plaster
Primer for decorative plasters / s.
For to apply the solution, you will need a metal half-trowel 30 cm long and a narrow metal spatula 10 cm wide.
Apply the solution on the half-scrubber
Apply a narrow solution with a spatula on a half-trowel, after which the tool is attached to the wall at an angle of 30 degrees and the plaster is distributed in an even thin layer to the thickness of the filler grain. Try to perform a minimum of movements in one area, and maintain the same pressure at all times.
It is most convenient to apply the mixture in narrow vertical stripes.
The next strip is applied so as to overlap the edge of the previous one by 5-7 mm. The solution must be stirred periodically, since the filler tends to settle to the bottom. In the process of work, individual areas should not be allowed to dry, since the transitions will be visible this way. If the area is large, it is better to work together with an assistant: one person will apply the plaster, the second will knead new portions of the solution.
Since the pattern is formed over wet plaster, each wall is processed separately from corner to corner. If you decide to first apply the mortar to the entire facade, and then start grouting, you will not succeed, since the first areas will already be dry.
The creation of a pattern is started in 10-20 minutes after application (depending on the composition of the mixture). The readiness of the plaster for grouting can be determined by the lack of gloss on the surface or by touching the wall with your hand - if the mixture does not stick to the palm, it's time to start grouting.
Take a plastic float, apply it to the surface, press a little and perform uniform movements in one direction.
As in the application, the walls are treated in sections no more than 1.5 meters wide. Movements must be accurate, there is no need to rush, and you cannot drive in one place several times. The joints of the two strips must be moistened with water.
Formation of the pattern
If you do not have time to make one plane completely, take masking tape and stick it along the line where the plaster ends layer.
Then apply a little mortar over the scotch tape, form a pattern, and immediately remove the scotch tape along with the remaining plaster. When you can continue working, first apply masking tape around the edge of the already dried plaster, and then start applying the mortar. This technique will avoid overlapping layers, as a result of which the transition will be almost invisible.
There are many variants of texture formation, the most popular of which are:
Texture shaping options
Drying the plaster layer usually takes about 2 days (for exact information look on the package of the mixture), and before that no work on the surface can be carried out.
After the specified time has elapsed, it is advisable to grind the coating with the finest emery paper in order to remove adhered mortar crumbs and smooth the surface. If acrylic tinted plaster was used, the finishing work is completed.
Grinding the walls after putty
When using a cement mixture to increase decorativeness, paint is performed. Water-soluble paints based on silicone and acrylic are best suited here. So, after sanding, the walls are cleaned of dust and treated with a deep penetration primer in one layer.
After the surface has dried, start painting. If you prefer to paint with a roller or brush, choose a tool with a long nap - this will allow you to accurately paint all the grooves and grooves. Apply the paint in two layers - the first with vertical strokes, the second with horizontal strokes.
Painting "bark beetle" plaster
Facade finishing with plaster should be performed at temperatures from + 5 ° C to + 30 ° C and humidity not exceeding 60%. Only in such conditions will the quality of the coating correspond to the specified characteristics.
That is why it is necessary to start finishing in dry, warm weather and preferably calm. Strong wind, like direct sunlight, negatively affects the plaster, contributes to its cracking. If the facade is in direct sunlight during the day, apply the plaster in the late afternoon so that the coating can harden and dry sufficiently overnight.
For beginners, it is better to start with the most inconspicuous part of the wall, since not everyone can accurately apply the drawing right away, and it is no longer possible to fix flaws on dry plaster. It is advisable to choose paint, primer and decorative putty from one manufacturer - this guarantees maximum material compatibility and coating quality.
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