In the process of decorating the exterior walls of the building today, a lot of materials are used, but one of the most popular solutions is vapor-permeable plaster. Its plus is that condensation does not accumulate inside the room, as a result of which the structure is ready to serve much longer than usual.
One drawback is that finishing work is not always possible to do on their own. This is due to some difficulties that a person who has the skills to work in such an area is able to overcome.
Description of the composition for aerated concrete and features of its use
In order to prevent cracks on the walls of aerated concrete, they must be protected from carbonization shrinkage. Care should be taken to ensure that the base material easily resists the effects of air and moisture, which will penetrate inside. An excellent protection is vapor permeable plaster.
Aerated concrete walls have one important characteristic, which is the ability to pass steam. Stucco for finishing should have the same properties. It is important that steam penetrates into and out of the building. If it settles from the inside, then with fluctuations in temperature the moisture will freeze and thaw, which will contribute to the appearance of cracks. Outside the layer will fall away, and inside it forms mold.
When finishing work, it is important to correctly determine the thickness of the layer. Without making calculations, you can take advantage of the experience of specialists. In this case, the lining is applied externally with a 2 times thinner layer than inside. Finishing should not have a thick layer, from the side of the premises this parameter is 2 cm or less.
The plastered wall should be painted with facade paints, which differ in the same vapor-permeable characteristics. Some people believe that stucco for aerated concrete is a mixture of sand, water and cement. The composition should have plasticity, high adhesion to the base and resistance to damage. If you purchase a ready-made mixture, then choosing it correctly is not a guarantee of success, you must use the material correctly.
When working with vapor permeable plaster, the characteristics of the composition are important to consider. After reading them, you can understand that you should monitor the temperature in the room, which is equal to the limit from +5 to + 30 ° C. Before starting work, it is necessary to clean the walls of dirt and stains, and if the material exfoliates, then it is cleaned. When working with a brick wall that absorbs material well, it must be primed before plastering.
If you have to work with a concrete wall or a surface of slabs that do not absorb moisture well, then the base is still primed, however, the mixture must meet the requirements for adhesion of two materials. If the plaster for aerated concrete is applied in 2 layers, then you must wait until the first is completely dry and becomes solid.
Description and characteristics of some compositions for aerated concrete
Among other market offers, you can consider the lime-cement mortar, which is used most often. It has a good ratio of quality and value. Quite popular brands are:
- KrasLand.
- Bolars.
- "Win."
- HandPutz Baumit.
The plaster can be applied in layers of 5 to 20 mm, the resulting coating will provide sufficient strength and the ability to operate for 15 years. Before purchasing a mixture, it is necessary to take into account the consumption of plaster, which will be 15 kg per square meter. Having built a bath from aerated concrete, you can finish it with a silicate compound, which is made on the basis of potassium glass. Products are notable for their low cost and service life of up to 15 years. Among the popular manufacturers of such mixtures, it is worth highlighting:
- Baumit Silikat Top.
- Knauf Kati.
The plaster is characterized by a neutral level of electrostatics, which eliminates premature dust pollution. The material is supplied in a container and is completely ready for use, which eliminates the need for solution preparation. You can finish the aerated concrete bath with silicone plaster based on the corresponding ingredient. These mixtures are in the expensive segment and have high adhesion and elasticity.
You can use the composition for new or existing buildings. The service life of the mixture on the wall exceeds 25 years. Among the most famous brands should be highlighted:
- Ceresit CT75.
- Kreisel SilikonPutz.
- Terracoat Sil.
Distinctive features of the mixtures are:
- resistance to ultraviolet;
- combination of vapor permeability and water resistance;
- possibility of use for external and internal decoration;
- ease of use;
- permissibility of sudden temperature changes;
- environmental safety.
The material is completely ready for application. The surface of prefabricated aerated concrete blocks must be prepared by coating with a primer. Synthetic base primer is used for pretreatment. After applying the plaster, you can form a relief on the surface of the facade with a plastic grater.
Description of acrylic compositions for aerated concrete
Aerated concrete can be finished with acrylic compositions based on the resin of the same name. These mixtures are highly elastic, so that no chips or cracks form on the surface. The layer is attractive because of the ability to choose any color and texture.
Acrylic compounds are used not only to protect aerated concrete, but also as a finish. Among the well-known brands you need to highlight:
- Ceresit CT60.
- Bolix KA.
- Baumit Nanopor Top.
Cons are:
- flammability;
- high electrostatic performance.
Description of gypsum mortars
Gypsum formulations should be used in a limited temperature range from +5 to +20 ° C. Walls are pre-prepared and cleaned of dust. To prevent the absorption of moisture from the solution, the facade is covered with a primer. As it can be used a mixture for cellular materials of the type “Knauf Grundirmittel” or “Winning Soil Concentrate”.
If necessary, a reinforcing mesh of polymers or metal is used, which increases the thickness and number of layers, and also prevents deformation of the material during its further operation.
The cost of the most popular vapor-permeable formulations
If you want to buy plaster for outdoor use, the price of this mixture should interest you. When buying material based on KrasLand cement, you will have to pay 240 rubles. per bag of 25 kg. “Bolars” costs a little cheaper - 205 rubles, but “AHIDA XI-S-42 will win” belongs to the same price category as the first of the mentioned mixtures.
Alternative market offers
The most expensive representative of the line is HandPutz Baumit, you can buy this mixture for 260 rubles. The price of plaster for outdoor use depends on the material in the base. For example, Baumit Silikat Top silicate mixtures will cost 4000 rubles. As for the silicone compounds, then Ceresit CT75 you can buy for 5200 rubles. 15 kg Kreisel SilikonPutz are offered for sale at a price of 2000 rubles. A 25 kg bag of Terracoat Sil can be bought for 4000 rubles. Acrylic mixtures Ceresit CT60 have a cost equal to 1900 rubles. Whereas Baumit Nanopor Top can be bought for 4400 rubles.
Properties of Ceresit CT 75 Plaster
This vapor-permeable plaster is a thin coating to create a topcoat. Among the main properties should be highlighted:
- high vapor permeability;
- resistance to pollution;
- weather resistance;
- excellent hydrophobicity;
- excellent resistance to ultraviolet;
- suitability for outdoor and indoor use;
- environmental safety;
- frost resistance.
The main characteristics of the composition
The composition contains: pigments, aqueous dispersion of acrylic and silicone copolymers with mineral fillers. Drying time before forming the invoice is 15 minutes. The density of the mixture is 1.73 kg / DM 3 . After a day, which will depend on the temperature, you can leave the facade, not afraid that it will damage the rain.
Adhesion to concrete exceeds 0.3 MPa. Operating temperature ranges from -50 to +70 ° C. The projected life is 10 years. For one square meter, 2.5 kg of vapor-permeable plaster will be needed, this is true if the grain fraction is 2 mm.
Finally
If you need to protect the walls from moisture, but keep their ability to let air in and out, then use the appropriate composition. The materials described in the article may have a different texture, which determines the method of their use.
Vapor-permeable facade plasters have different colors, which allows you to implement interesting design solutions. You can add paint to the mixture, then the coating will not be monophonic, but will have a whole palette of colors.