How to plaster walls from a gas block inside. The technology of plastering walls from gas silicate blocks. Internal plasters on cellular concrete

As you know, foam concrete structures are one of the most popular options for building houses, baths and other buildings. The material is easy to use, has high performance and decent thermal insulation performance. And the most important stage of work on finishing this type of structure is the external and internal plastering of walls from gas silicate blocks.

What requirements should the finish meet?

For the cover to work long years without repair and damage to the structure, it must have the following properties:

Resistance to mechanical damage, this factor is important both when applied from the outside and from the inside. This property allows the layer to withstand various deformation effects and remain intact for a long period of time.
Vapor permeability- a factor whose importance is difficult to overestimate, it allows the remaining moisture to leave unhindered, preventing the appearance of condensate inside the structures. Due to this, the service life of the building and the preservation of the original properties of all materials are significantly increased.
Moisture resistance, if inside the house this property may be needed only in bathrooms, shower rooms and pools, then outside it is strictly necessary. After all, if water gets into the material, then when low temperatures freezing occurs, accompanied by the expansion of the substance and the destruction of the protective layer.

The preservation of the original properties of the material at any temperature is important at, since they are affected by many adverse factors, which are especially detrimental in the cold season.
The mortar must adhere well to the substrate - this is the only way to guarantee the highest strength of the coating, in addition, any cavities under the material can cause flaking of the material.
Material elasticity, it must be plastic so that seasonal movements of the structure, shrinkage of the building, expansion of materials when heated do not cause cracks to form on the surface. In addition, the elastic mortar is much easier to apply and level.
Fire resistance of substances included in the composition allows you to provide fire safety building and its resistance to impact high temperatures– The higher the fire threshold, the better protected you and your family are.

The main features of the work

Before you start plastering walls from gas silicate blocks, you should carry out a whole complex preparatory activities. This is due to the specifics of this type of work and the need to comply with technological process ().

Preparation of materials and tools

To streamline the preparation process, you should follow a certain sequence of actions so as not to forget a single detail:

First, you should measure the area that will be finished with a solution. Next, it is worth checking the plane of the walls with a plumb line or a level, if there are irregularities, then they will need to be leveled, and the mixture consumption will increase significantly. Despite the fact that the price of plaster is low, it needs a lot, so accurate calculations will save money.
If thermal insulation is carried out, then the required amount of material should also be calculated. Most often, foam or facade is used for this. mineral wool 5 cm thick or more. The volume of insulation is measured in cubic meters.

When using heaters, do not forget about fastening; for this, a special adhesive for thermal insulation and special dowels with pressure washers are used.
Plaster mesh - another indispensable attribute solid foundation, with its help, the surface becomes resistant to cracking. It is best to choose an option with a density of at least 200 g / m 2, while choosing products from trusted manufacturers.

Plaster beacons for setting the required level of the future wall and greatly simplifying the work. It is difficult to overestimate the importance of these elements - they are the elements that determine the geometry of the surface.
Highly important element- a solution for priming the surface, because thanks to it the structure of the base is strengthened, and absorbency is significantly reduced, so that plastering work can be carried out more efficiently.

Advice! It is best to use a facade primer both outside and inside the premises, it has higher qualities and will ensure the highest quality of work.

Rule or, as builders call it, cutter. With its help, the solution will be drawn along the beacons, and thus the surface will be perfectly leveled. You should not take too wide options - if you do not have experience, and you do all the work yourself, then a length of 2 meters is enough.
A container for preparing a solution, it can be special variant made of plastic or an improvised vessel of sufficient size.
To prepare the solution, it is better to have a drill with a mixer. The volumes are quite large, and you will get tired very quickly if you carry out this step with your hands.
To throw the mortar, a plasterer's trowel or a special ladle is most often used - they can be found in any store construction tool, and the choice of a specific option depends on what is more convenient for you to work.
A grater for leveling the surface and a half-ter for removing excess mortar from the surface.

If you have all of the above, you can get to work.

main stage

Consider how to properly plaster walls from gas silicate blocks:

First of all, the surface is cleaned of all contaminants, sagging of the solution and other stains. Sometimes it may even be necessary to wash the surfaces to remove all the dirt. Work should start dry. clear weather at positive air temperature.
First of all, the surfaces are coated with a primer, this step is mandatory, and ignoring it significantly reduces the strength of the surface. The easiest way is to use a brush-brush or a roller with fur pile. They provide high speed of work and high quality of a covering.
After the composition has dried, you can proceed to fixing the insulation, and if it is not there, reinforcing plaster mesh. It should be stretched and fit snugly to the surface. Pay attention to the quality of the product - the material should not stretch, otherwise it will not work to ensure the proper level of rigidity.

Highly milestone- display of lighthouses on the facade. They are fastened with plaster mortar, the easiest way to do this is with laser level, but you can get by with a plumb line or level. First, two extreme elements are fixed, a cord is pulled between them, and the remaining beacons are placed.

Further work can be continued after the solution has solidified and the beacons are securely fixed. Remember that a solution layer exceeding 15 millimeters is not recommended. At the same time, it must be applied in two layers of 7-9 millimeters.
The first layer is applied with a trowel or a ladle, while it can not be leveled much, anyway, there will be a final coating on top, which will make the surface even.
Remember that the solution must be prepared as required by the instructions, too liquid, as well as too thick consistency makes it difficult to work and degrades their quality. Most often, a bag of solution is poured into the container, and water is added in a proportion of about 1 liter per 5 kilograms.

The prepared solution is thrown onto the wall in sufficient quantities, after which it is leveled along the beacons using the rule, the excess solution is pulled together and collected back into the container.
You need to rub the surface with a grater when it has not yet completely frozen. The work is done in a circular motion, the excess solution is removed. If the surface is too dry, it can be moistened with a spray bottle.
And don't forget to check the plane of the wall with a long wooden lath, and you need to control both vertically and horizontally. If all is well, you need to wait for the solution to dry completely, after which you can proceed to further work.
As a final finish, several options can be applied: various facade paints, which allow the material to breathe, but at the same time protect it from moisture. Another option is decorative plaster compositions, with which you can give the walls a certain structure. And of course, do not forget about such an option as facing with clinker tiles or other facade materials.

Subject to all the requirements of the technology, such a coating can serve you for several decades, while do not forget to periodically update paintwork- it will refresh appearance at home and protect the material.

Advice! After one and a half to two years, it is recommended to treat the surface with a water-repellent composition, it will give the surface additional moisture resistance.

Output

As you can see, the work is quite within the power of any person who wants to master the new kind activities. At the same time, significant funds saved on the wages of builders are saved.

The video in this article will help to cope with the work even better, it clearly explains some of the nuances.

The article popularly talks about the widely used building materials, lightweight concrete, the main characteristics and methods of finishing using traditional technologies, stucco house elements.

Aerated concrete wall plastering

Plastering of internal and external structures made of lightweight concrete is the most used method of protection against external influences. climatic conditions and giving the house an original respectable appearance, as well as internal comfort.

The prevalence of technology is due to the ability to inexpensively and on their own to carry out a set of works on the preparation and finishing of structures and achieve the desired results.

Special characteristics of aerated concrete blocks

Aerated concrete refers to cellular concrete, consists of quicklime, cement, sand and aluminum powder that forms gas. When mixing components and water, a reaction occurs with the release of gas, forming voids, the number of which determines the weight, density, thermal conductivity of concrete and areas of use:

Concrete with a density of 300-400 (kg/m3) is used for thermal insulation.
Density 500-900 (kg / m3) allows you to use for the construction of partitions and walls.
With a density of 1000-1200 kg / m3, concrete is used to make load-bearing walls.

Concrete has gained popularity in housing construction due to its properties:

Low thermal conductivity allows it to be used as a heat insulating substance.
Frost resistance can reach 150 cycles, among lightweight concretes only expanded clay concrete has greater durability.
High fire resistance.

Of the negative qualities for construction, hygroscopicity can be noted, which means that aerated concrete needs to be coated.

The hygroscopicity of aerated concrete requires isolation from moisture.

Preparation of gas silicate blocks indoors for plastering

In aerated concrete, the amount of cement is up to 60 percent, in gas silicate - no more than 14, lime is twice as much, the rest is sand. The percentage matters, because the more cement, the higher the strength, and the base must be stronger than the coating, otherwise it will peel off. That is, the decoration of the house must be done with a lime-cement composition.

When finishing, you need to remember that the base must be stronger than the coating.

The main function of plastering surfaces from gas silicate blocks is the formation of a vapor-tight barrier and limiting the absorption of moisture. To improve the adhesion of the coating to the base, the structural elements are coated with a primer. deep penetration, the first layer is applied generously, better with a spray gun, after drying, you need to paint over again.

After priming, given that gas silicate composition the base is weak, it is necessary to carry out reinforcement to prevent the appearance of cracks.

The rough layer of reinforcement is made of glue, on which the blocks were laid, experienced craftsmen use tile adhesive for this, as a cheaper composition.

The use of glue instead of a conventional solution is associated with polymer additives in the composition, providing strong bonding with a thin layer of the mixture.

After applying a thin layer of glue, 2-7 millimeters thick, a fiberglass mesh is embedded in it, which fixes the blocks and serves as a reliable base for the coating. The grid is superimposed on the applied glue with an overlap and is pressed with a spatula with teeth.

It is desirable to start applying the solution after 5-7 days, when the reinforced layer gains strength.

Plastering of gas silicate blocks inside the building: technologies used

Protection of gas silicate structures occurs in three stages:

1. Plastering lime- cement mortar.

2. Priming.

3. Putty.

A lime-cement or lime-gypsum mortar with a thickness of not more than one centimeter is applied to the reinforced surface.

The technology of manual plastering is common, if the wall is large and uneven, beacons are installed and the applied layer is equalized with a wide rule.

The solution is kneaded in a bucket, small tank or trough, water is poured into the poured mixture and stirred to the required consistency, you need to cook a little, gypsum sets in 20 minutes, cement needs a little more time, so the amount should be sufficient to produce during this time. You can level immediately after throwing, the last step is grouting.

After finishing with a long rail, the evenness of the surface is checked, irregularities within 5-7 millimeters will be invisible.

Is it necessary to plaster the gas block from the outside

The need to protect the facade of aerated concrete is due to its properties:

Hygroscopicity will lead to the saturation of gas blocks with water, which in case of frost will cause the destruction of the structure.
Mechanical impact will cause chips, dents, cracks.
The material has a porous structure with open pores through which the circulating air carries away heat.
Rough aerated concrete house looks unrepresentative.

For aerated concrete structures, the danger is the accumulation of moisture inside the blocks, which freezes during temperature changes and destroys the block from the inside. Therefore, the protection of external surfaces is mandatory, the method of protection by plastering is widely used due to different reasons one of which is the low cost of this technology.

Applicable materials for outdoor work

For application protective equipment outside, substances are needed that have the following qualities:

permeable to water vapor;
not wet;
with good grip;
frost resistant.

The main types of mixtures for finishing aerated concrete outside:

Acrylic for aerated concrete, strengthen loaded structures, plinth.
Silicate, include liquid glass;
Silicone, based on organosilicon polymers, well suited for facades, but high price;
Gypsum mixture;
Lime-cement composition.

Do-it-yourself internal plastering of a gas block: a feature of the work

Due to the high hygroscopicity of the material, plastering inside the house has its own characteristics.

Plastering surfaces must necessarily include the process of reinforcement. It is recommended to use a fiberglass mesh that does not collapse in an alkaline environment.

The surface should be painted over with a deep penetration primer twice.

Apply a thin layer of plaster with a thickness of about 5 millimeters and drown the mesh in it. After drying, apply the main layer using beacons.

What is the best plaster

If vapor permeability is required for kitchen, bathroom or sauna rooms, mixtures of gypsum with perlite sand are used. Silicate is also suitable, however, it should be noted that such mixtures are incompatible with acrylic, silicone, latex materials.

For use on aerated concrete, cement-lime mixtures can be used, which do not require a primer on the walls.

Set of tools

Finishing aerated concrete surfaces requires the following tools:

Spatulas.
Scraper to remove dirt and debris.
Metal brushes.
Hammer, for knocking down irregularities, protruding mortar.
Sandpaper.
Brushes, rollers for priming.
Master OK.
Tank for mixing solution.
Mixer for preparing the solution.
Falcon, a shield where the mixture is applied.
Grater for grouting.
Poluterok.
The rule is to align the corners.

How to plaster: work progress

Ready mixes are great for finishing, but have high cost, therefore, for do-it-yourself work, a technology for preparing the wall is proposed, after which you can safely use any composition.

For preparation, you will need tile adhesive, fiberglass mesh, deep penetration primer. It is necessary to level all the chips and cracks with a composition for laying aerated concrete blocks, then remove dust and debris from the wall with a cheek and paint over with a deep penetration primer twice.

The tile adhesive is diluted and applied to the surface with a thickness of 5 millimeters, the mesh is pressed on top with a notched trowel. When the layer is completely dry, plaster is applied in the usual way, any solution can be used.

The cost of this technology will be an order of magnitude less than when using ready-made plasters.

How long can you move on to the next stages of wall decoration

After the end, the beacons are removed, the resulting dents are subsequently sealed with putty.

To move on to the following types of finishes, you must wait until the walls are completely dry when constant temperature. Drying will take about a month in the warm season so that temperature changes do not lead to cracking or peeling. It is undesirable to speed up the process; if necessary, a heater is used.

The interior and exterior decoration of the house is an important stage of construction work, the quality of which depends on the durability, comfort of living and the aesthetic appearance of the house. For finishing work there are many modern materials and technology, but traditional methods, do not lose popularity and are relevant at the present time. These methods allow you to achieve the desired results with low cost and labor intensity.

Useful video

Aerated concrete plaster, internal and external, must have optimal parameters, protecting the walls of the structure from destruction and cracks under the influence of external influences. There are several basic options for finishing mixes that will improve and maintain the quality of the base. The right technology application will ensure a long service life and decorative coating.

Aerated concrete has good thermal insulation properties and a high degree of vapor permeability, due to the porous structure. To preserve the quality of the material, preventing the accumulation of condensate and the occurrence of mold, will help correct finish aerated concrete.

In this article, we will answer main question, so how to plaster aerated concrete outside the house and inside.

Aerated concrete blocks

Basic requirements for plaster

It should be noted right away that ordinary plaster it is not recommended to apply to a house made of aerated concrete blocks. Primarily because the standard sand solutions different high density, this leads to poor adhesion when applied to the gas block and the rapid appearance of cracks.

Adhesion(from lat. adhaesio - sticking) in physics - the adhesion of surfaces of dissimilar solid and / or liquid bodies.

The plaster must maintain an optimal microclimate inside the building, protecting the walls from moisture. Therefore, mixtures with a vapor-permeable base should be chosen. Otherwise, steam escaping from the house will get stuck inside the walls, as the plaster will simply block it from escaping. Thus, moisture will begin to accumulate in the walls, which will eventually lead to their destruction. Of course, nothing will happen to the house in a few years, but in six or eight years, an almost irreversible process of destruction will begin.

Plaster for aerated concrete should be:

resistant to external atmospheric influences;
have good adhesion (adhesion to aerated concrete);
resistant to sudden changes in temperature;
high degree of compressive strength (protection against cracking);
vapor permeable;
moderately dense;
improving the thermal insulation of walls;
have a decorative look.

When choosing a plaster for aerated concrete, one should not ignore any of the items listed above.

Applying plaster to a house made of aerated concrete blocks

The lack of facade finishing of aerated concrete structures will lead to darkening, deformation, and peeling of the surfaces of the blocks.

Types of plasters suitable for aerated concrete blocks

Choice plaster mixture for aerated concrete, it primarily depends on whether you are going to clad the walls from the outside or from the inside. Plasters according to the type of application are divided into external and internal.

As you understand, exterior plaster is intended for facade decoration. Since it performs protective functions here, its strength, moisture resistance and thermal insulation indicators should be higher.

Internal mixtures are intended for finishing walls in rooms, therefore, the presence of moisture resistance in the characteristics of these plasters can be ignored, with the exception of wall cladding in the bathroom. Due to the lack of resistance to moisture internal blends are much cheaper than outdoor ones.

Applying the final layer of plaster on aerated concrete

Popular plasters for aerated concrete

Mixtures for finishing facades from gas blocks are divided according to the type of composition into:

lime-cement;
acrylic;
silicate;
silicone.

Lime-cement mortars quite durable and at the same time vapor-permeable, because their main component is lime, which replaces sand. Eliminate poor water resistance, elasticity and limited selection color palette material can be using various additives. Modern ready-made mixtures contain special fillers that improve the properties of the coating.

acrylic it is advisable to finish the building from aerated concrete only if there is high-quality internal insulation of the walls. Such plaster cannot boast of good vapor permeability, but as decorative finishes, it is strong and reliable.

silicate plaster for aerated concrete is made on the basis of liquid potassium glass. The covering differs in good moisture resistance, vapor permeability and durability. The silicate type solution is easy to apply. The finishing layer is resistant to dirt and abrasion, providing a decorative effect. finish coat long term (more than 25 years). The problem of silicates is a small choice of colors.

Alignment of walls with silicate plaster

Silicone compounds contain resins, organosilicon polymers. Qualitative characteristics materials are optimally suited to create a durable coating. Silicone type plaster retains elasticity after application, which ensures that there are no cracks on the surface even when the blocks shrink. It is important to note the special decorative finish, thanks to special fillers and color variations can be given original look facade.

Silicone plaster can undoubtedly be called a leader among others, it has all the advantages of silicate compounds, besides it is durable and looks great. But the price of silicone mixtures is much higher than others.

On our website you can find contacts construction companies, which offer the service of designing houses from aerated concrete. You can directly communicate with representatives by visiting the exhibition of houses "Low-Rise Country".

The most popular manufacturers

The building materials market is saturated with a huge amount of plaster mixes various brands for finishing aerated concrete surfaces. Popular compositions have optimal characteristics for work.

Applying plaster on the interior walls of a house made of gas blocks

Ceresit CT 24. Mineral composition mixture gives the solution plasticity. The material is easy to apply. The coating is able to withstand up to 100 cycles of low temperature exposure. Coloring is recommended to be done after complete drying (after seven days).

CERESIT ST 77. acrylic look the mixture is used for facade decoration, providing the strength of the coating with a sufficiently thin layer of application. The material is frost-resistant, resistant to external influences. It is used in the presence of hydroprotection and ventilation inside the house.

Founding Startwell T-21. Cement-lime plaster is characterized by frost resistance, a sufficient level of adhesion. The resulting coating is resistant to shrinkage and moisture.

Video description

See the video comparison of facade plasters for aerated concrete:

Baumit Silicon Top. High level adhesion and plasticity is achieved due to the basis of the mixture - silicone resins. The coating retains its decorative effect for a long time, thanks to its dirt-repellent properties. A wide choice of a palette of colors of the material (up to two hundred shades).

Weber.pas silicone. Mixture based on silicone emulsion. There is a possibility to choose the appropriate grit size. Optimum material resistance to moisture, temperature, dirt.

Baumit Silikat Top. Silicate type of plaster. The covering differs in durability, good vapor permeability. The composition has a different grain size and up to two hundred variations of tinting.

Surface priming before plastering

Internal plaster walls made of aerated concrete

Internal work on plastering walls from gas blocks is carried out with gypsum mortars with various additives. Composites in the form of perlite, marble chips will increase the decorative effect of the finish. There is the possibility of coloring the composition with various colors.

Gypsum mixtures without additives are different necessary level vapor permeability, which allows the plaster to be used as a base for wallpapering. Standard work sequence:

elimination of irregularities, chips on the surface of the walls;
removal of dust and application of the first layer of solution;
installation of reinforcing mesh;
applying the second layer.

After complete drying, you can glue the wallpaper, paint the walls or apply a third, decorative layer plasters.

Internal work is carried out only subject to the preliminary application of a waterproofing composition, priming.

Interior plaster walls

External plastering of aerated concrete walls

Plaster for aerated concrete front view can be applied while using various technologies: thick-layer, or thin-layer finish. The sequence of work includes:

mandatory preparation of wall surfaces, leveling;
priming (compositions based on acrylate siloxane);
applying a thin layer of mortar - the basis for attaching the mesh;
reinforcement (protection against cracks);
leveling the finishing layer;
the second layer of coating (formation of a smooth, even surface);
finishing layer of plaster, grout.

A year after the completion of the facing work, it is recommended to apply a water-repellent solution. Thanks to the processing of the facade with this composition, moisture-proof and water repellency coatings.

Features of plastering walls from gas blocks

Proper execution of work must take into account the characteristics of the material of construction. Aerated concrete blocks may have differences in structure. Sawn options have an open, pronounced cellular structure and do not require special training when finishing.

The formed blocks are covered with a hydrophobic layer with a buried pore structure and need to be additional processing. Grinding surfaces with a metal brush will help to increase the adhesive properties of the material.

Video description

Watch the video of the process of applying plaster to a house made of aerated concrete:

It is also important to remember the rule of increasing the degree of vapor permeability from the inner layer to the outer surface. Facade finishing should be twice as thin as the inner coating.

It is strongly not recommended to carry out work on plastering surfaces from gas blocks earlier than 6 months after the walls have been erected. The structure must dry completely, getting rid of excess moisture accumulated during the laying of the material.

Plastering on reinforcing mesh

Optimal conditions for applying plaster

External plaster aerated concrete must be produced under certain conditions. It is important to complete interior work elevated levels of humidity. Bearing structures walls of gas blocks must be completely dry, not exceeding 27%. Otherwise high humidity provoke a violation of adhesion and lead to peeling of the finishing layer of the facade.

The optimal time for finishing inside the house is spring, the facade of the building is the end of summer.

External temperature conditions for work should correspond to + 5- + 30 ° С, with air humidity not more than 80%. If it is necessary to carry out finishing at low temperatures, it is recommended to use a special deep-penetrating primer before the onset of acceptable weather conditions.

Proper work will help to avoid peeling, cracks and defects. It is forbidden to apply the coating in the heat, under the influence of direct sun rays and in windy weather.

Plastered facade of aerated concrete house

Conclusion

Choosing a quality solution for plastering aerated concrete structures will help improve performance characteristics material, will create a strong and durable surface protection.

Properly plastered walls are the key to quality home construction. Many people want to know how the internal plastering of aerated concrete walls should be carried out. The article will tell you all the nuances and sequence of decorative wall plastering.

Aerated concrete blocks are most often used in the construction of low-rise buildings.

Their main characteristics are presented in the table:

In the manufacture of aerated concrete blocks, aluminum powder is added to the solution, which acts as a blowing agent. This creates an open cell structure, which increases the vapor permeability of the blocks. Such characteristics must be taken into account when plastering aerated concrete inside or outside the house.

Plastering of aerated concrete should begin with inside building, and then its facade. This is due to the fact that the water used in "wet work" will go outside through the blocks and the existing ventilation.

Water vapor at negative temperature environment will begin to condense inside the walls of the house and at the border of blocks with exterior finish (see Exterior finish of aerated concrete house - a responsible matter). When freezing, moisture will lead to inevitable cracking of the plaster layer, and then peeling it off.

Tip: It is necessary to perform plastering of aerated concrete walls first inside the building.

Types of plaster

Internal decorative plaster for walls made of aerated concrete can be:

Vapor permeable. It includes mixtures made on a gypsum basis. The best option- Aegis TM35 plaster mixture, which includes lime.

The mixture has a minimum weight, sufficiently high adhesive properties, good strength of the hardened coating layer.

Vapor barrier. Differs in the presence a large number polymer impurities. It includes: plastic decorative internal plaster and ordinary cement-sand mixture without additives.

The best option than plastering the gas block inside is the usual inexpensive gypsum mixture used in conjunction with a vapor barrier primer.

Indoor plastering of aerated concrete walls is one of the topical issues in the construction of gas blocks. The fact is that the material needs to be plastered for a number of reasons, the main of which are the cleanliness and smoothness of the surface, since without additional measures the finishing layer will not hold well. To make it clearer, all these nuances should be understood in detail.

Aerated concrete blocks are characterized by ease of use: the material is warm and light. This facilitates their trouble-free cutting to obtain the required dimensions. However, a completely logical question may arise, why do we need aerated concrete plaster? The point is that the blocks smooth surface, which will not allow you to properly fix the finishing layer. In this case, the choice of plaster mixtures for a gas block should be approached very carefully. Plastering walls from the inside allows you to solve the following tasks:

protects the surface from jumps temperature;
provides good level adhesion to other materials;
improves thermal insulation characteristics;
provides vapor permeability;
protects against moisture.

It should be borne in mind that aerated concrete, like foam concrete, has a cellular structure. Therefore, plastering must be carried out in compliance with the technology. Otherwise, air circulation is disturbed, which leads to a deterioration in the properties of the material. Plastering of aerated concrete walls outside the premises is also necessary. The outer finish protects against the effects of precipitation and the accumulation of harmful gases and dust.

When to plaster?

The gas block, due to its porous structure, easily absorbs moisture, so it must be immediately protected from such negative impact. If construction material wet, there is nothing critical in this. However, you should not allow freezing of water in the block. As a result, cracks may simply appear, the strength will decrease, and there is no need to hurry with the cladding. After the masonry is completed, the walls must dry. That's why aerated concrete walls it is necessary to plaster only in heat. If the blocks are not stacked on a special adhesive mixture, which provides a seam of small thickness, increases the drying time.

There are situations when in the warm season it is not possible to perform Finishing work. In this case, the walls are covered with deep penetration soil, which will reduce moisture absorption. In addition, it is recommended to cover the walls with plastic wrap. If you follow the advice of the masters, then it is best to finish the walls of aerated concrete during the period when the temperature at night does not fall below 0˚С. Depending on the region, such temperature indicators correspond to the time from late March to early October. From the above, we can conclude whether it is necessary to plaster aerated concrete walls.

Types of plaster mixes

Before you figure out how to plaster aerated concrete walls, you need to decide on the materials that are suitable for these purposes. Building mixtures can be purchased ready-made or kneaded independently immediately before application. To prepare a high-quality solution, it is necessary to use a filler, which is used as sand, gravel, sawdust or stone chips and a binder ( slaked lime clay, gypsum, cement). Water is added to these components. Cement-sand plaster and mixtures, which use slaked lime, cement and sand, are prepared on construction site. To date, clay is used quite rarely.

As for ready mixes for plastering, they are supplied in dry bags. They include:

cement;
gypsum;
sand;
fillers.

Such mixtures are divided into cement and gypsum, which have their own properties and features in application. Cement-based compounds have a longer drying time, are subject to cracking and sedimentation. Plaster on aerated concrete is applied in a layer 5-10 mm thick.

What mixture to choose?

All the mixtures that were listed above have different properties and, when applied to a building material, act differently. But the question of which plaster is better to plaster aerated concrete walls remains open. First, consider what is used to protect the outer walls, which are constantly affected by precipitation, wind and temperature. As a rule, these are mortars based on cement and sand. They have proven themselves in constant contact with moisture. But the question is - can they be used for plastering aerated concrete? Due to the porous structure, the gas block quickly absorbs moisture, as a result, the cement simply does not have time to gain the necessary strength.

To plaster aerated concrete walls with cement mortar, you need to do it right, i.e. with technology. To prevent moisture from the building mixture from being absorbed into the block, the surface must be prepared. For this purpose, it is covered with several layers of a deep penetration primer, with each layer being completely dry before applying the next. Before applying the plaster, the surface of the wall is wetted. To avoid cracking, it is recommended to use a mesh.

How to plaster aerated concrete inside the house? Gypsum mortars, unlike cement mortars, dry faster, and the surface is less prone to cracking. Mixtures based on gypsum are used for partitions and internal walls, since such compositions are of little use for external use due to the constant influence of moisture. Ready plaster mixtures contain various additives and fillers in their composition, due to which the surface is endowed with resistance to cracking and negative influences.

If there is a choice between ready mix and made before use, it should be taken into account that the properties of dry plaster are more predictable. In the process of production of such compositions, the moisture content of the sand, the quality of the cement, the accuracy of all components are controlled. As for mixtures that are prepared on site, it is quite problematic, if not impossible, to check the quality of cement. The main disadvantage of dry plasters is the high cost.

Preparatory activities

To fully answer the question of how to properly plaster an aerated concrete surface, it’s worth starting with the tools that you need to work. In fact, the tools used are the same as for applying a traditional plaster mixture. To prepare the solution, you will need a container, which can serve as a plastic bucket or tank. By volume, they should be sufficient to stir all the components.

After pouring the dry mixture into the container, add water. To mix the solution, use a construction mixer or a drill with a nozzle. To achieve the required consistency, the proportions of water and material are determined according to the inscriptions on the bags with dry plaster. To work, you will need the following tools:

Master OK;
plaster ladle;
trowel.

Plastered aerated concrete is rubbed with a grater, while the excess mortar is removed with a trowel. Beacons are used to level the surface, the solution is pulled together using the rule. An obligatory tool for checking defects on the surface of the walls is a long rail from floor to ceiling. The maximum deviation should be no more than 7 mm.

Plastering the surface from the inside

After deciding how to plaster aerated concrete, proceed directly to the workflow. As with any other type of finish, you first need to prepare the surface. Gas blocks need to be cleaned of residues masonry mixture and close the seams. As already noted, a primer is applied before plastering. Internal plastering of aerated concrete walls consists of the following steps:

Reinforcing mesh attachment. To increase the strength of the rough finish, you can use a chain-link mesh with a small mesh size. In addition, a reinforcing material with alkali-resistant fiber is added to the composition of the mixture. The mesh is fastened with nails 120 mm long, which are well driven into the aerated concrete wall.
If the reinforcement process is not expected, special grooves must be made for better adhesion of the block surface with finishing materials. For these purposes, any suitable tool such as a hacksaw.
Applying the plaster mixture on the reinforced base. In this case, they resort to applying the mixture by spraying, when the voids of aerated concrete are completely filled. The first layer of plaster is not leveled, which will provide better adhesion.

A primer must be applied over the rough layer of plaster. It is recommended to add to the priming solution slag sand. It is desirable to apply the finishing layer of plaster using building mixtures with fine sand in the composition, which allows you to get a smoother surface. At the end of the process, the already dried solution is smoothed to make the surface as even as possible. As a rule, smoothing is started 24 hours after application. To make the surface smoother, the blocks are sprayed with water.

The final step is Painting works that involve the use of paints. Materials in this case are selected with a high degree of vapor permeability. After the surface is painted, it is recommended to apply a water repellent, which will increase the durability and strength of the finishing layer. Lifetime interior decoration depends on many factors. One of the main ones is the quality of the materials used, i.e. should be based on cost. The characteristics of the gas block are no less important, because on the surface Low quality even a good finishing mixture will not hold well.

Exterior wall plastering

The most budgetary and common plaster for outdoor use is cement-sand. However, the mixture is not suitable for aerated concrete due to low vapor permeability. For these purposes, mineral, silicate or silicone facade plasters. They have a number of necessary characteristics: vapor permeability identical to aerated concrete, good adhesion, have a beautiful appearance. They start plastering the facade only after the completion of all processes, as a result of which moisture is released inside the room, and the surfaces are completely dry. Gas blocks must be dry, and the maximum allowable humidity is 27%. If this figure is too high, the water vapor that will escape to the outside will cause peeling of the finishing layer. Facade plaster for aerated concrete should be endowed with the following qualities:

frost resistance;
high adhesion to the base;
increased compressive strength;
weather resistance;
decorative.

Plaster for exterior decoration can be applied to the walls of the house in a thick layer (thick layer) or thin (thin layer). Thin-layer plaster is characterized by the fact that the material is applied in several layers with a thickness of not more than 10 mm. After preparing the surface and covering with soil, a thin layer of plaster (up to 5 mm) is applied and reinforced with a mesh.

For reinforcement, metal (wire diameter - 0.1 mm, mesh size - 0.16 * 0.16 mm) or fiberglass mesh (mesh size - 50 * 50 mm) is used. Its installation is carried out with an overlap of 50 mm. In addition, the corners of the building are formed, for which a perforated corner with a mesh is used, which prevents the appearance of cracks due to shrinkage of the building. Using a spatula, the mesh is sunk into the applied mixture. Reinforcing material must be installed at the locations of doors and windows. Then the plaster layer is leveled and waiting for it to dry. The second layer is considered leveling, so you need to strive to create the smoothest possible surface. After the finishing layer is applied and the surface is rubbed with subsequent grouting. It remains to cover the building outside with paint, apply textured plaster and a hydrophobizer.