Aerated concrete plaster with cement mortar. How to plaster aerated concrete: technology for applying plaster on aerated concrete walls

Often, developers have a question how to plaster aerated concrete from the outside. Before starting work, it is recommended to determine the important characteristics and, based on this, choose the best finish.

Aerated concrete plaster must meet the basic requirements - the mixture is tight to the surface and has good adhesion. The finishing layer is durable, frost-resistant while having the right level of vapor permeability and water repellent.

When to do plastering work

External plastering is recommended after finishing work in the building. It is generally accepted that if you do not protect the surface of gas blocks from the street, it will absorb moisture. This is not so, primed walls can stand without a protective layer for the whole winter, when the climate changes in spring, moisture from the surface will evaporate. In the opposite case, when the house is processed from the facade, evaporation vapors will be directed inside the room, which will lead to the appearance of dampness.

Note! An exception is the option of building a house on the seashore or pond. When it is required to protect the external walls from the influence of humid climate and winds.

Before plastering, the walls of the gas blocks should dry well. If during the construction process a cement mortar was used, which has the ability to absorb moisture. For this reason, exterior decoration during the rainy season will not be effective. But especially dangerous for the walls is cold water, which then turns into ice. In the process of melting, the structure of aerated concrete begins to collapse.

Facade insulation

If the building is properly insulated, then you can quickly heat the room and save money on heating costs. Insulation from the outside is recommended to be done with mineral wool, polystyrene foam, polystyrene foam or other options. For example, insulation and plastering of the facade of a house can be replaced by building an additional brick wall or treated with liquid polyurethane foam.

Types of plasters

There are several types of plaster that are suitable for processing aerated concrete walls. There are certain requirements for the composition of the mixture for outdoor work.

The material must be permeable and at the same time its coefficient should be higher than that of the treated surface - aerated concrete or sealant.
The plaster must be resistant to frost and temperature changes.
To prevent cracking, the applied layer must be flexible.
Plaster should have strong bonded qualities with aerated concrete.

Mineral

How to plaster aerated concrete walls? Professionals and private builders recommend the use of mineral-based plasters. They are among the thin-layer compositions specially created for aerated concrete finishing. Such solutions are made with their own hands, they have an affordable cost, good vapor permeability and low weight.

The finished compounds include such components:

lime;
white cement;
marble chips and other fillers.

The color palette of such plaster mixes is limited. They can be easily painted; the only caveat is the use of vapor-permeable coloring compounds. Painting is able to protect the coating from moisture, because a humid environment can destroy mineral plasters.

Silicate

The basis of this type of building plaster is potassium water glass, which is a binder component.

Advantages of the silicate mixture:

Ease of application;
Resistance to moisture;
Vapor permeability;
If necessary, painted in any color;
Acceptable price;
Long service life (up to 25 years);
Decorative qualities.

Silicone

It is better to plaster aerated concrete blocks with facade silicone plaster. It has high technical and operational characteristics, surpasses other plaster mixes.

The advantages of silicone plasters include:

water repellent properties;
building material is easily applied by hand, without the involvement of specialists;
plaster has a high degree of resistance to atmospheric phenomena and vapor permeability;
Long service life;
Fillers have a different texture;
The material is elastic.

Acrylic

The material has high decorative qualities and durability. A big disadvantage of acrylic plaster for processing aerated concrete and other cellular textures is the low level of vapor permeability. For this reason, condensation forms in the inner layer of the plastered surface. As a result, under such an impact, surface deformation occurs - peeling and cracking.

Cement-sand

Cement plaster is not suitable for the treatment of external aerated concrete surfaces. For what reasons, this popular building material is not suitable:

The solution is not fixed on a smooth surface of aerated concrete due to insufficient adhesion properties. The mixture has a high density and high weight;
When applying a cement mortar to the surface, aerated concrete absorbs moisture, weakening adhesion of materials. As a result of such rapid drying, the integrity of the layer is destroyed;
Low vapor permeability of cement mixtures - inconsistency with building standards, and violation of optimal microclimatic indicators in residential premises.

If cement plaster is used for interior work, it will protect aerated concrete walls from the penetration of steam.

Important! Expanded polystyrene and polystyrene are not recommended for use for surface treatment of aerated concrete.

Gypsum plaster

Plaster, which includes gypsum, has the following positive qualities:

dries quickly;
the solution does not shrink;
the mixture goes smoothly;
no topcoat required.

Cons of stucco walls with gypsum:

average vapor permeability;
more water is required compared to special mixtures, about 10-15 liters per 1 bag of 25 kg;
the surface will quickly get wet after rain and snow;
spots appear on the surface that need to be painted over.

Front

The mixture is most effective for processing both external walls and indoors, the material is easily applied with your own hands. Plaster has a number of positive qualities - good adhesion to the base, attractive appearance. In particular, the material has vapor permeability indices identical to those of gas blocks. When choosing plaster for the construction of aerated concrete, it is better to choose a quality special mixture, this will simplify the process of decorating the house.

If there is a choice of plaster or drywall, which is better for aerated concrete inside the house. The following facts should be taken into account: walls made of gas blocks are smooth, and they do not require alignment. Accordingly, the plaster will be cheaper, the solution will lie in an even and beautiful layer.

Do it yourself

We plaster aerated concrete on the outside with plaster intended for outdoor use. There are two options for applying the mixture - a thick layer or several thin layers, which are applied no more than 3 layers and not more than 1 cm each.

Work order:

the surface is prepared for plastering - pollution is removed;
then you should do the hanging of the surface with your own hands along the lighthouses;
spray is applied - the first layer of plaster coat;
the primer is applied and leveled;
cutting corners;
slope finish;
a coating layer is applied;
the surface is overwritten.

Technology work outside

If necessary, a heater is mounted for blocks under the plaster.
Wall preparation - surface leveling to reduce material consumption and application thickness.
Before you start plastering the walls, aerated concrete should be treated with a primer. For this, compositions intended for the fine-mesh structure of materials are used.
Application of a thin layer of plaster mix for aerated concrete surfaces - up to 5 mm. This base will serve to attach the mesh.

It should immediately be noted that it is unacceptable to plaster aerated concrete blocks from the outside with adhesive solutions. Because the glue does not fulfill the tasks. In order to protect and level the surfaces, it is recommended to use specially designed mixtures that meet all operational requirements.

When work is done on plastering the facade of aerated concrete, it is recommended to follow some rules, which are described below.

after the building is erected, it is necessary to withstand a certain period of time so that internal moisture evaporates naturally;
brand of plaster should be suitable for outdoor use;
sequence of repair work - first inside the house, after outside;
the temperature regime should correspond to +8 to +30 С0 - for outdoor decoration;
Building regulations, the observance of which should be taken into account in relation to increasing the coefficients of thermal conductivity. Each mounted or applied material to the gas block should be considered.

Reinforcement

To the question whether it is necessary to reinforce the plaster, and whether a mesh is needed. The answer is simple, since the layer of plaster coating of aerated concrete can vary from 5 to 15 mm. If the layer exceeds 10 mm, a metal mesh with a fine texture of the cells is used as the reinforcing layer. For example, a mesh with a wire diameter of 0.1 mm and a mesh size of 0.16 x 0.16 mm, or fiberglass mesh with 5x5 cm cells, is suitable.

You need to mount the grid with an overlap of 5 cm, for the corners of the house use perforated corners with a grid. This method will help prevent cracking on the plaster after the building shrinks. It is better to install the mesh in the applied solution with a spatula. A particularly important point is the installation of the grid in places with a high level of voltage - the area of \u200b\u200bwindows and doors.

Advice! If you attach the net to a dry surface, the result will be zero. Because the mesh needs to be fixed to the wall using self-tapping screws, and then apply a layer of mortar. Otherwise, the non-fixed mesh will move along with the putty.

Work order:

Align the plaster layer with the mesh using vapor permeable plaster.
It is necessary to wait until the first layer is completely dry. Otherwise, it will fall away under the weight of the next layer. This technique provides for a thin layer application of the mixture. It will take three to four days to wait for complete drying. Accordingly, the thicker the layer, the more wait for it to dry. Checking whether the surface has dried is carried out using water. Splashing liquid onto the surface, it was quickly absorbed - this means that it is time to begin further work.
A second layer of plaster is applied, which is considered to be leveling. Therefore, the layer should be even and smooth;
A third finishing layer of plaster is applied and, if necessary, it will require subsequent grouting.
Painting the surface with materials for outdoor use or applying putty.
Water repellent treatment. Experts recommend applying this solution 12 months after staining and completing all work on the facade cladding. Water repellent gives any coating additional water repellent properties.

Note! When the plaster layer dries, it must be protected from the influence of such undesirable environmental factors as moisture, snow, rain.

Putty

When deciding whether it is necessary to putty aerated concrete, it is recommended to learn about the types of building mixtures. There are 3 types of varieties of products on the market that are designed for finishing. By and large, this is facade plaster intended for thin-layer finishing of an already plastered surface, differing only in composition. Ready mixes are sold in buckets and come in silicate, silicone and acrylic.

Important! Performing work on plastering the house from the outside, it is recommended to use only steam-passing building materials. This will provide not only a reliable finish, but will serve as a decoration for the building.

Aerated concrete blocks for the construction of houses are becoming more popular: they are light, even, hold heat well due to the porous structure. But their high vapor permeability imposes serious restrictions on the choice of finishing materials and the technology for their use.

In particular, before plastering aerated concrete from the outside, you need to finish all the “wet” internal work, choose the right composition and calculate the thickness of its application. More on all this will be discussed in the article.

Features of aerated concrete and its decoration

In its composition, aerated concrete is similar to ordinary concrete: it includes cement, sand, lime and water. But the addition of aluminum powder, which is a blowing agent, gives it a specific porous structure. Moreover, unlike foam concrete, the pores are open, which increases the vapor permeability of the material.

Open pores on the surface of building blocks cannot be left without finishing for many reasons.

For example:

Exposure to precipitation. Wetting the outer layer reduces the thermal insulation properties of the walls, leads to the appearance of cracks on the surface and even their destruction when exposed to temperature changes;
Settlement of airborne dust. It, like rainwater, has an acidic character, and prolonged exposure to an acidic environment causes darkening of the surface and leads to a deterioration in the appearance of the blocks.

That is why the instruction requires a mandatory external decoration of such surfaces. It can be performed in many ways, including the installation of ventilated facades, brick cladding with a ventilation gap, etc.

But most often, special facade plasters for aerated concrete are used for protective and decorative finishes. Its main purpose is to protect the walls from the above factors, but the coating should not reduce their vapor permeability, preventing the diffusion of water vapor from the inside out.

Properly plastered walls - the key to quality home construction. How should be the internal plastering of walls made of aerated concrete many want to know. 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, acting as a blowing agent. This creates an open cellular structure, which increases the vapor permeability of the blocks. Such characteristics must be taken into account when aerated concrete plastering is carried out inside the house or outside.

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

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

Tip: Plastering walls of aerated concrete is necessary first inside the building.

Types of plaster

Interior decorative plaster for aerated concrete walls can be:

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

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

Vapor barrier. It is characterized by the presence of a large number of polymer impurities. It includes: plastic decorative internal plaster and the usual cement-sand mixture without additives.

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

The article popularly talks about widely used building materials, lightweight concrete, basic characteristics and methods of decoration using traditional technologies, plastering house elements.

Wall plaster of aerated concrete

Plastering internal and external structures of lightweight concrete is the most used method of protection against the effects of external 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 range 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 forming gas. When components and water are mixed, a reaction occurs with gas evolution, forming voids, the amount of which determines the weight, density, thermal conductivity of concrete and the scope of use:

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

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

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

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

The hygroscopicity of aerated concrete requires isolation from moisture.

Preparation of silicate blocks indoors for plastering

In aerated concrete, the amount of cement is up to 60 percent, in gas-silicate not more than 14, lime is twice as much, the rest is sand. The percentage is important, because the more cement, the higher the strength, and the base must be stronger than the coating, otherwise it will peel off. That is, home decoration must be done with a lime-cement compound.

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

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

After the primer, given that the gas-silicate composition is weak, it is necessary to reinforce to prevent cracking.

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

The use of glue instead of the usual 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 with a thickness of 2-7 millimeters, a fiberglass mesh is embedded in it, which fixes the blocks and serves as a reliable basis for the coating. The mesh is superimposed on the overlapped adhesive and pressed in with a trowel with teeth.

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

Plastering gas silicate blocks inside a building: technologies used

Gas silicate structures are protected in three stages:

1. Plastering with 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.

Manual plaster technology is common if the wall is large and uneven, beacons are installed and the applied layer is made wide by the rule.

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

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

Is it necessary to plaster the gas block outside

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

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

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

Applicable materials for outdoor work

For applying protective equipment from the outside, substances are required that have the following qualities:

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

The main types of mixtures for finishing aerated concrete from the outside:

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

Do-it-yourself inner stucco stucco: feature of work

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

Surface plastering must necessarily include a reinforcement process. It is recommended to use a fiberglass mesh that is not degraded in an alkaline environment.

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

Apply a thin layer of plaster about 5 millimeters thick and drown the mesh in it. After drying, apply the base coat using beacons.

Which is better with stucco

If vapor permeability is required for the premises of a kitchen, bathroom or sauna, 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, for which a wall primer is not required.

Set of tools

Finishing aerated concrete surfaces requires the following tools:

Spatulas.
Scraper to remove dirt and debris.
Metal brushes.
Hammer, for knocking irregularities, protruding solution.
Sandpaper.
Brushes, rollers for priming.
Master OK.
Tank for mixing the solution.
Mixer for the preparation of the solution.
Falcon, shield, where the mixture is applied.
Grater for grouting.
A half.
Rule for alignment of angles.

How to plaster: work progress

Ready mixes are great for decoration, but have a high cost, so the technology of preparing the wall is proposed for do-it-yourself work, after which any composition can be used without fear.

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

Tile glue is diluted and applied to a surface with a thickness of 5 millimeters, a mesh is pressed over with a notched trowel. When the layer is completely dry, apply the plaster in the usual way, you can use any solution.

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

How much can I proceed to the next stages of wall decoration

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

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

Internal and external decoration of the house is an important stage of construction work, on the quality of which the durability, comfort of living and aesthetic appearance of the house depend. There are many modern materials and technologies for decorating, but traditional methods do not lose popularity and are relevant at the present time. These methods allow you to achieve the desired results at low cost and labor.

Useful video

Aerated concrete has long been loved by private developers for its excellent performance and very attractive cost. However, before starting construction from it, you need to study all the "pitfalls" in this matter in order to build a high-quality and durable structure. So, when planning the decoration it is important to know how to stucco aerated concrete inside the house is possible, and what materials are prohibited. What are the reasons for such restrictions and what kind of finish is ideal for gas silicate blocks, we will consider below.

Features of aerated concrete walls

Before plunging headlong into the issue of finishing walls, you first need to understand the structure of gas blocks, from which the quality of the future home will completely depend.

The main way to obtain this cellular material is the introduction of special additives into the composition of the concrete mortar, which, when reacted, form air bubbles that tend to break out. They simply dot the aerated concrete body not only with voids, but also with thin channels, forming a surface resembling natural pumice in its texture. This structure has excellent positive properties with proper final processing of blocks:

high sound absorption coefficient;
good level of thermal insulation;
“Breathing” walls create a unique indoor microclimate that preserves warmth in the winter season and cool even in the most intense heat;
the porous structure of aerated concrete is not subject to the emergence and maintenance of colonies of fungal and other microorganisms, which as a result of their vital activity destroy walls.

Porous aerated concrete structure

But despite these wonderful performance characteristics, aerated concrete also has drawbacks due to its structure:

the porous structure is subject to increased water absorption, which is fraught with rapid destruction of the blocks;
products with the highest density and, accordingly, strength, do not differ in resistance to mechanical stress, leading to spalling and cracking;
the heterogeneous structure that retains heat so well is very sensitive to wind. Unprotected bare aerated concrete walls are heavily blown, and it’s cold inside them, despite a well-organized heating system.

Taking into account all these negative circumstances, we can conclude that aerated concrete walls need compulsory decoration. But it must be done as competently as possible so as not to disrupt the microcirculation inside the walls, which can lead to destructive processes.

Vapor permeability

The porous structure, which has been talked about so much, has another property - good vapor permeability, which is the key to the durability of any structure made of cellular concrete.

In the process of life, people release a large amount of all kinds of moisture into the atmosphere. Just imagine how the air is saturated with it when ironing, washing, drying clothes, cooking or taking a bath. Of course, part of the vapor produced is removed using artificial and natural ventilation, but the bulk falls on the walls. In its pure form without finishing, aerated concrete perfectly passes moisture without retaining it inside your body.

Another thing is if there is a facade and interior cladding, and it is mandatory for such a wall material. Therefore, both finishes should complement each other, maximally organizing the natural conclusion of humidity.

For example, a ventilated facade system was chosen as the exterior finish. In this case, the provided ventilation gap does not upset the natural moisture balance in the aerated concrete wall, leaving complete freedom for couples to go outside. In such circumstances, you can use any plaster for aerated concrete.

Ventilated facade - the best type of exterior decoration for aerated concrete walls

In the case of wall insulation devices, you need to pay attention to the characteristics of the base material. For example, mineral wool fully complies with the requirements - it qualitatively insulates and does not interfere with the removal of moisture. As in the previous example, the steam circulation is not disturbed, and the wall remains dry, so you can choose any plaster mixture.

How to maintain a natural moisture balance

But often, for one reason or another, the facade finish is arranged to bypass the basic rules, or, even worse, the insulation was made with polystyrene sheets (its vapor permeability is almost zero) without a ventilation gap. This leads to the accumulation of moisture in the thickness of the wall, which over time appears in damp corners, the collection of condensate in the room - and these are the first precursors of the appearance of fungal mold.

The consequence of violation of vapor permeability of aerated concrete walls

This serious flaw can be corrected only by using materials for interior decoration, whose ability to pass vapors is much lower than that of aerated concrete. This shielding method will prevent the accumulation of moisture inside the walls. Best used:

paints with a special composition;
waterproof wallpaper;
cement-sand plaster mortars of dense consistency.

But in this case, the importance of a high-quality ventilation device is greatly increased so that accumulated moisture does not settle on the walls and indoors, creating a greenhouse effect.

In order not to complicate the construction process, it will be most correct to initially perform interior decoration. After all, the repair involves a large amount of evaporated moisture, which just needs to go outside, and best of all if he does it through the "bare" gas silicate walls.

And one more small nuance regarding the timing of processing walls from aerated concrete blocks. Any cellular materials give a good shrinkage, which, in turn, negatively affects any finishing cladding - usually this is manifested in cracking and peeling of the decorative layer.

Therefore, it is recommended that both internal and facade finishing processes be carried out at least six months after the complete erection of the building’s box and roof device. It is best to plan this phase of construction for the spring - summer period. As mentioned above - first the interior decoration is carried out, after the end of all processes, in a month you can start processing the facade.

Which plaster to choose for interior decoration

As already noted above, aerated concrete blocks are characterized by a high degree of water absorption, which can lead to excessive drying of the applied layer of plaster. This is especially evident on gypsum compositions and cement-based mortars - quick drying, cracking and shedding. If you go from the opposite, and unnecessarily saturate the wall with water, then it simply will not be possible to plaster, since the applied layer will not be held on an aerated concrete basis.

The choice of the right materials will help to solve this problem:

deep penetration primers with a special composition. Applying them, the main thing is not to overdo it and not to oversaturated the wall surface with moisture. Therefore, before use, read the instructions and follow them strictly;
special mixtures intended for plastering precisely gas silicate blocks. Their composition perfectly protects such "capricious" porous surfaces. But this is subject to dilution of the plaster in the correct proportions with water. Not to be mistaken in this matter will only help following the instructions for use from the manufacturer.

But that is not all. The cellular surface does not have good adhesive qualities. For this reason, initially you need to apply a rough coat of plaster with a thickness of at least 5 mm. But even this finish is subject to cracking and peeling. To prevent this, plaster mesh is used. It is best to give preference to fiberglass or polyurethane fabric, due to their excellent resistance to alkaline environment and long service life. Only after applying such a reinforced plaster layer and its complete drying can we safely proceed to the finish.

The best plaster mixes

Having a little understanding of what parameters the finishing mixture should meet, let's look at its most popular and effective types:

plaster compositions based on silicates, namely “water glass”. They combine perfectly with aerated concrete surface, especially in terms of vapor permeability. But there is a small "but." Such stucco mixtures are incompatible with many types of finishing, for example, based on acrylic, latex, silicone;
gypsum plasters with perlite sand. They are ideal for aerated concrete wall surfaces, as indicated on the package. Any material for finishing is suitable for them;
cement-lime-based plaster mixes with the addition of optimizing additives. Such compositions are invented specifically for finishing cellular material, even without a preliminary primer. Interior stucco walls made of aerated concrete of a similar plan have not only excellent adhesion properties, but also apply to both rough and finish finishes.

The use of such plaster compositions is ideal for gas silicate walls and, if desired, they can be used to apply a leveling layer by yourself. Like all specialized materials, improved for use in one area, such mixtures have a very high cost, which ultimately adds up to a decent amount.

But there is an alternative that will allow to economically resolve the issue of internal plastering - the use of an ordinary cement-sand mortar in a ratio of 1: 5. But use it in relation to aerated concrete surfaces must be extremely careful and not overdo it with the addition of water to the working mixture.

The process of self-internal plastering

Even if you decide that the plastering of walls of aerated concrete inside the room will be done by masters, then knowing the process of its implementation will not hurt. Indeed, even professionals can sometimes make mistakes, and external control will help to avoid annoying shortcomings.

Preparing for plastering

The algorithm of the process for preparing walls for plastering is quite simple in execution, in which it is impossible to make a mistake. Therefore, you can do it yourself. This will require:

or plastic 100-120 cm wide;
adhesive for ceramic tiles;
deep penetration soil;
gear spatula with teeth 5-6 mm.

Stage 1. Carefully inspect the walls for building "jambs". For example, cracks and chips are to be putty with alignment to the general level of the walls. For these purposes, an ordinary repair mortar is suitable, however, if it is not required so much, it is best to use an adhesive specifically designed for aerated concrete.

Step 2. After the restored parts have dried, use a stiff brush on all walls to remove dirt and dust.

Step 3. Apply a primer in one coat. This can be done in a way convenient for you, for example, using a roller or brush. To reduce the consumption of the primer, experienced builders will use conventional sprayers. If there are none at hand, then you can just as well use the old model of a vacuum cleaner, the principle of which is to blow air. Only after high-quality drying of the first layer can you start applying the second one.

Stage 4. When the primer is completely dry, you can safely spread the glue according to the instructions and cut the plaster mesh into strips, the length of which should be equal to the height of the walls.

Step 5. Starting from the bottom, throw the prepared glue on the wall gradually moving up. The thickness should be approximately equal to a layer of 5 mm, and the width is slightly larger than the width of the mesh.

Step 6. Attach a strip of plaster and press so that it lays securely on the wall. Now it is possible to level the adhesive layer with a notched trowel so that the direction of the grooves runs horizontally. This improves adhesion to both the wall and future plaster.

Plastering

After the reinforced layer is completely dry, you can safely proceed to the main plastering process.

Stage 1. With a construction level, profiles - beacons are set.

Step 2. The working solution is mixed according to the instructions. If the choice fell on a traditional cement-sand composition, then it is taken in a ratio of 1: 5, a plasticizer is added and kneaded to a thick consistency.

Beacon alignment

Stage 3. Between two lighthouses a solution is poured over the entire height of the wall. Using the rule, the resulting layer is leveled to the desired level of smoothness. Attach the rule to the wall again and check to see if there are gaps between them. If there is, add the mortar and smooth, no - fine, plaster all the walls in a similar way.

The described technology of plaster is quite simple and even an inexperienced master can successfully use it. The main thing is to correctly choose what to plaster aerated concrete walls inside the house.