The use of plasters for the protection and improvement of external walls was traditional in ancient times, so this type of coating cannot be called innovative. Nevertheless, there is still something new in it. Modern formulations differ from their "progenitors" not only in the selection of components. Finished coatings have different characteristics, and their texture can vary not only due to the execution of an artistic image, but thanks to a variety of additives, including polymer ones. An excellent example of such composition is silicone facade plaster, which we will discuss below.
To understand why plasters with the addition of silicone are so good, you need to have an idea of this type of polymer. It is based on silicon, the molecules of which are "crosslinked" with oxygen molecules due to the addition of atoms of organic substances, and are chemical, intricately intertwining chains.
The number, length and variants of their weaving determine the properties of the final product. Today it is possible to obtain silicone with desired characteristics by simulating its molecular structure on a computer. There may be several varieties, but they are all united by one common term "silicone".
Two of them are used as a binder in the manufacture of plasters. These are siloxane, which is a low molecular weight rubber, and an organosilicon polymer, which is, in fact, the classic version of silicone.
We will not go into the chemical jungle - we will notice only that these substances have a high degree of vapor permeability, which is of paramount importance for a facade material mounted without a ventilation gap. After all, steam must be able to freely leave the room through the walls, otherwise they will constantly get wet and moldy.
To avoid this, it is the top layer of the outer finish that should have the maximum vapor permeability, which is, in this case, plaster.
It is only important that other materials used in conjunction with it - paints and primers - have the same properties.
Silicone has one more remarkable property - elasticity. Therefore, on its basis, mainly decorative elastomeric plasters are made, designed to form a relief on their unhardened surface.
Note.To enhance these properties, silicone can be combined with another type of polymer (for example, with acrylic resin), or with substances having a silicate base (for example, with liquid potassium glass).
The main advantage of silicone and other polymer plasters from cement is their non-shrinkage. Like the material itself, the finished coating has a certain degree of elasticity, and with thermal expansion it simply stretches and does not crack.
Despite the ability of silicone compounds to penetrate steam, they repel moisture. This means that the wall covering will not get wet and flake off from the base, which is another advantage of this type of plasters.
Plasters are not cheap pleasure, a bucket with a capacity of 25 kg costs about 2700 domestic production, and 5200 imported rubles.
Consumption depends on the thickness of the applied layer, but on average it is about 3 kg / m² wall area, respectively, it will be enough for finishing only 8-9 m² in one layer.
If you have to fork out, then everyone wants this very wall to be not just smooth and warm, but also pleasing to the eye. Therefore, the fact that with the use of plaster you get a coating with an interesting texture can be counted among the undoubted advantages.
The options are not too varied - basic colors from the RAL catalog.
Silicone-based plasters are most often universal, and can be used both for the exterior of the house and for its interior decoration. However, this is not at all the kind of plaster through which you can make a flat wall surface.
For its application, the base must be prepared in advance using conventional mortar or any alternative method. Some manufacturers of decorative plasters also offer basic leveling compounds with increased vapor permeability.
Alternatively, you can give the base the required quality using one of the methods of dry leveling. In relation to the facade, for this purpose, DSP (cement-bonded) or OSB (wood-polymer) boards are used.
Very often, the basis for decorative plastering is insulation, on top of which a reinforcing layer of glue and mesh is made.Such a surface also needs improvement, which we will discuss in the next chapter.
The presented instructions describe the process of bringing the insulated surface of the facade to perfection, but in principle, it can be guided in many other cases.
Table 1. Surface preparation.
Step 1 - determination of uneven areas
| In order to be able to see exactly in which areas during the reinforcement of the insulation recesses were obtained, a two-meter rule must be applied to the surface. Draw chalk around the places where you see gaps between the tool and the tie. So go over the entire area of the wall.
Step 2 - wetting the depressions with water
| As a result, all available your hollows will be outlined with chalk circles, and you will clearly see where you need to increase the thickness of the screed.
To do this, take a bucket of water, and dipping a brush into it, wet the desired area.
Step 3 - building up a reinforcing layer in certain areas
| There should be another bucket at the ready - with an adhesive mixture, which was used to adhere the insulation, and with which its surface reinforcement was made.
Spread some of the mixture on a wide trowel and build up one or two missing millimeters of screed thickness. Let the surfaces dry completely.
Step 4 - cleaning the sag
|As if carefully you have not worked, there will still be slugs on the surface. They need to be cleaned, for which you take a spatula, medium in width, with which you pass over the surface, and an abrasive mesh, through which you then grind the base.|
Step 5 - Treatment with penetrating soil
|Dust forms during stripping , which is the main enemy of any decoration. A penetrating primer will help to tie it, and along the way to reduce the absorbency of the base.|
Step 6 - applying a leveling layer with a trowel
| At a time specified by the manufacturer time it dries up - and you can proceed to the final alignment.
For this, the same adhesive mixture can be used as before, only a slightly more liquid consistency.
Place it with a trowel on a large trowel and apply in stripes from bottom to top on a small (about 1m²) section of the wall.
Step 7 - pulling the solution with a wide spatula
|Now you need to remove the excess mixture, for which you take a wide spatula and make a broach with arc movements. In this case, the removed solution is distributed to adjacent, not yet plastered areas.|
Step 8 - grouting the surface
| You may not succeed very smooth - especially if you haven't worked with a plastering tool before.
The existing flaws on the screed can be eliminated with a plastic grater, vigorously passing it in a circular motion over the still plastic solution.
The better surface quality you achieve at this stage, the better the end result will be when you finish finishing.
Step 9 - treatment with quartz soil
| Then again priming process, only now you need to use a primer, also based on silicone. All manufacturers offer adhesives for their plasters in a set.
Typically, these primers contain a coarse filler in the form of sand to roughen the surface.
They are also tinted white to create a background and the gray cement shade does not show through the thin decorative layer.
Step 10 - Applying silicone plaster
|Only remains decorate the finished base. How? Information about this will be presented below.|
In our example, a two-layer puttying was carried out with an adhesive mixture, since the surface of the insulated walls is quite even and does not have any special errors. If you have, for example, a brick base, then first you need to pre-align using a mixture with a larger dispersion of the filler (it will make it possible to apply thicker layers), and then do everything as shown in the table.
Manufacturers call such compositions plaster or putty with the addition of the word "basic" or "starting".
We figured out the quality of the base - now let's look at what visual effects can be obtained using silicone-based plaster for finishing the facade ... In general, there are a great many options, but complex types such as imitation marble are usually performed indoors.
Table 2. Popular textures on the facade.
|Decorative effect||How is achieved|
| This plaster contains two fractions of filler: 1-1.5 mm and 2-2.5 mm, for due to which a certain waviness is obtained on the finished coating.
1. Sometimes the decorating material is tinted at the factory in pleasant pastel shades; the primer paint is sold in the same color, which is applied to the base before plastering.
The mixture is applied to the surface with small grips, carefully smoothed with a trowel, and the note is structured in a circular motion with a grater until the texture appears.
| In general, the effects of most decorative coatings are achieved due to the grain size of the filler, as well as tools and improvised means that can be used in this case.
In particular, a "fur coat" can be made by spraying a solution and pressing the formed tubercles with a grater, or applying a liquid mixture and rolling it with a roller with long fur.
"Bark beetle" - imitation of wormholes on a tree
| To stylize the effect of the bug-eaten wood, which is aptly named "Bark beetle", the manufacturer adds a larger grain of filler to the plaster mix. Its minimum fraction is 2-3mm.
1. First, one layer is applied, equal in thickness to the aggregate grain size, and smoothed with a trowel.
Such plaster is usually not tinted in bulk, but surface painting is done with silicone paint.
| The most beautiful multicolor appearance of the coating, tonality and the texture of which is determined solely due to the natural qualities of the stone present in the composition. Most often it is multi-colored marble or granite chips, sometimes with the addition of small particles of mica, mother-of-pearl. |
There are a lot of pebbles in the composition, they completely cover the base and hold on to it quite firmly after the layer has dried. To protect it from external influences, a final layer is applied with a special varnish coating
| The name "Sahara" immediately suggests the idea of sand and dunes. It is them that such a coating should imitate. There is no coarse filler here, but only carefully calibrated sand with a fraction of 1.5-2 mm.
You can use a special colorant to add color to the mixture, but you can buy such a plaster already tinted if you are satisfied with the shades of yellow inherent in sand. There is a lot of filler in the plaster, so the effect is perfectly consistent with its name.
| In textured plasters, the filler is the finest, and sometimes even powdered. When working with them, the drawing is created not at his expense, but using a special tool (for example, a textured roller) or devices such as crumpled cellophane or a sponge.
With the use of such a composition, you can work in the sgraffito technique - to create ornaments and volumetric artistic images.
But the most popular effect that you see in the photo is the imitation of the texture of travertine stone.
And in conclusion, we just offer you a gallery of facades, beautifully, and sometimes unconventionally decorated with using silicone plasters:
For more details on the options for decorating the facade, see a special article.
As you can see, a facade finished with plaster can be very, very diverse when a silicone-based decorative composition is used for this purpose. And if you think over well not only the combination of shade and texture of the coating, but also supplement it with volumetric decorative elements, which, by the way, can also be plastered, your facade will delight you and attract the glances of passers-by for many years.
Posted By: Work Style |09, Nov 2020
Posted By: Work Style |10, Nov 2020
Posted By: Work Style |09, Nov 2020
Posted By: Work Style |04, Nov 2020
Posted By: Work Style |03, Nov 2020