How to properly plaster the walls of gas silicate blocks. Aerated concrete walls plastering technology. What tools are required

Currently, such construction material like aerated concrete. For the construction of a low-rise building, it is the best solution. Active use of aerated concrete in modern construction due to the low cost of blocks, low specific gravity, high thermal insulation properties, the possibility of machining hand tool, high fire safety.

However, after the completion of the main construction works the question inevitably arises about the further interior and exterior decoration of the house. There are various types of finishes, but plaster is the most widespread. Let's try to figure out how to plaster aerated concrete inside the house.

Plaster options for aerated concrete walls

In addition to the above advantages, which ensured the popularity of such a building material, it also has disadvantages that require a number of additional rules to be followed during finishing works... These disadvantages of aerated concrete include:

High vapor permeability;
The ability to absorb moisture very quickly and in large quantities;
Fragility.

The first two disadvantages have a particularly important effect on aerated concrete plastering. It is the high level of adhesion that significantly complicates the finishing process both from the inside of the house and outside. There are three options for plaster for aerated concrete walls:

Cement - sand;
Plaster;
Facade.

It is important to note that whichever plaster material you choose, the finish aerated concrete walls you should start with internal work. This is due precisely to the high vapor permeability of aerated concrete. When performing external plastering, the humidity of the room increases significantly, which can adversely affect the quality of internal work.

Wall decoration inside a house can serve two purposes:

Maintaining, or even increasing the vapor permeability of aerated concrete. This option is used if the main purpose of finishing is to create an optimal microclimate in the house.
Complete vapor barrier. This option is used if the outer surface of aerated concrete is also plastered; in this case, the release of steam to the outside is minimized, which has a positive effect on the durability of the external plaster.

Now let's consider which material will be most suitable for plastering your particular house.

Cement - sand plaster. Often, many ask the question: is it possible to plaster aerated concrete with cement mortar? Wall decoration with such material is highly undesirable for the following reasons:

The vapor permeability index of cement is significantly lower than that of aerated concrete. It is possible to provide an optimal microclimate in an aerated concrete house only if the vapor permeability of the finishing material is equal to or exceeds that of aerated concrete.
With significant indicators of moisture absorption, aerated concrete will intensively absorb moisture from the sand-cement mortar, and this will significantly reduce the quality of the plaster, since the acquisition of optimal strength parameters by cement plaster is possible only if it dries slowly and evenly.
Low adhesion and high specific gravity solution exclude the possibility of its reliable adhesion to the material.

Plaster. Plastering aerated concrete inside the house with gypsum has both advantages and some disadvantages. The benefits include:

1. Fast drying;
2. No shrinkage;
3. Possibility of obtaining a smooth surface;
4. With skillful plastering of aerated concrete walls, you can avoid applying the finishing layer. It is unlikely that the surface quality will allow tinting, but wallpapering is quite acceptable.

The disadvantages of gypsum mixes include:

Low vapor permeability;
A fairly large volume of water is required to mix the mixture;
High adhesion of dried plaster to atmospheric precipitation and moisture in general.

Despite the above disadvantages, plastering aerated concrete with gypsum is quite acceptable.

Facade. This type of plaster mix is optimal for aerated concrete plastering inside and outside the premises. The vapor permeability indicators of such a composition correspond to those of aerated concrete blocks, they are characterized by high adhesion, and they also have good aesthetic properties after drying.

Interior decoration of aerated concrete house

Currently, there are a large number of ready-made dry mixes for wall plastering. When choosing a material for plastering, the following factors must be taken into account:

The plaster mixture must have good vapor permeability parameters, at least equal to the parameters of aerated concrete;
To prepare the working mixture, an excessive amount of water should not be used.
The selected mixture must have a high coefficient of adhesion to the substrate;
The ductility of the plaster should ensure the walls are resistant to cracking;
The frost resistance of the selected mixture must correspond to the climatic conditions;
The time before the start of setting of the newly prepared mixture, in other words, the time during which the prepared mixture has sufficient plasticity to be applied to the base.

At present, Ceresit CT 24 is confidently leading in the market of dry mixes for aerated concrete plastering, with a huge variety of choices, in terms of price-quality ratio.

In conclusion, I would like to remind you that regardless of how to plaster aerated concrete, adherence to the technological regimes specified by the performer of the plaster mixture is directly related to the quality and durability of the work carried out. Preparation of the base should not be neglected either. Preliminary removal of various unevenness of the masonry will allow you to significantly reduce the layer of applied plaster on aerated concrete, and, consequently, its consumption.

Plastering walls from aerated concrete inside a residential building is one of the best options preserve the heat-saving properties of the enclosing structures.

The use of aerated concrete blocks as a building material is almost ideal for low-rise housing. Private houses built from them have such advantages as low weight (and, therefore, do not require the construction of too strong foundations), low thermal conductivity and an affordable price. At the same time, an increase in the moisture content of blocks leads to a deterioration in its heat-saving characteristics, and to a heavier structure. To protect the walls, aerated concrete wall plaster is required - sometimes external, but most often internal.

Finishing features

When performing internal plastering of aerated concrete, it is worth considering the features of this material and the differences from more traditional brick, concrete and stone. First of all, this applies to the cellular structure of the blocks, which were originally considered a heater, and only then they began to be used for the construction of the walls themselves. Due to the open structure, which is the result of the addition of a special blowing agent (aluminum powder) to its composition, aerated concrete has a high level of vapor permeability. This characteristic is one of the main ones when choosing a material and finishing method.

Regardless of the choice of how to plaster aerated concrete, finishing work should begin from the inside, and only then deal with the facade of the building. Changing the order and performing first external, and only then interior decoration, results in too high humidity in the room. Escaping (especially in severe frost) steam condenses in the walls at the border of aerated concrete and finishing. The moisture created in this case can lead to cracks in the plaster and the falling off of its pieces. That is why the interior finishing work is performed in the first place.

Choice of method and material

When performing finishing work, plastering of aerated concrete walls is performed in one of two main ways. The meaning of the first is not only to preserve, but even to increase the vapor permeability of the blocks. The second, on the contrary, assumes complete vapor barrier. The advantages of maintaining vapor permeability are to create an optimal microclimate, and the option with wall insulation - in safety exterior decoration which is not affected by steam leaving the building.

Unsuccessful options

It is not recommended to use cement mortar for plastering aerated concrete inside. The first reason is that smooth blocks do not allow the material to stick. The cement layer quickly falls off and the finishing has to be done again. Secondly, the best option for plastering blocks, a material with the same or greater vapor permeability index is considered as compared to aerated concrete. In cement, this characteristic is much lower, which does not allow maintaining normal conditions inside the building. For the same reason, the answer to the question whether it is possible to plaster expanded polystyrene or expanded plastic will be negative.

In addition, the cement-sand mortar has a high humidity due to the significant amount of water required for its preparation. Aerated concrete structures with high rate water absorption, absorb liquid from the finishing material. The quality of the mortar, which requires uniform drying for curing, decreases, as does its ability to adhere to walls. As a result, cracks appear on the plaster, and its quality decreases, bringing the next repair closer.

You should not choose a special adhesive mixture for finishing aerated concrete inside. Despite the fact that it is designed taking into account the peculiarities of the material, it is advisable to apply the glue in a thin layer, which is not suitable for protecting against cracks. As soon as the vapor permeability of the block is broken, they will immediately appear on the surface of the thin-layer plaster for aerated concrete from the adhesive mixture;

cracks;
seam marks;
and even mold.

Breathable finish

Choosing the option of finishing walls made of aerated concrete indoors while maintaining the natural vapor permeability of the material, they use plaster mixes on gypsum and gypsum putty. Due to the slaked lime and perlite sand in their composition, water vapor easily penetrates through the plaster layer. Another advantage of this option is that there is no need to prime the surface of the enclosing structures.

Slightly less often, mixtures containing a high content of such natural materials with a high degree of vapor permeability are used as internal plaster of aerated concrete walls:

chalk;
marble;
dolomite;
limestone.

Their vapor permeability indicators are higher in comparison not only with internal, but even with external plaster, and the dried solution is easily rubbed off, acquiring ideal whiteness. The resulting coating has excellent durability and allows further finishing.

You should know: Due to the porous structure of concrete, it is recommended to putty it only after applying a primer. If this is not done, cracks will appear on the putty.

Vapor barrier finish

When choosing the finishing of aerated concrete indoors with the elimination of vapor permeability, that is, with complete insulation of the enclosing structures, one of the materials is polyethylene film. The easiest and fastest way to fix it on the walls is to lay it under one of the finishing layers. However, the speed and ease of installation does not matter if condensation forms on the structures finished in this way and the plaster swells. More suitable option in order to plaster aerated concrete inside the house, a sand-cement mixture will become, in the composition of which there are no additives in the form dolomite flour or lime. With its help, vapor permeability decreases several times, but the possibility of plaster peeling increases after a while.

Additionally, to reduce vapor barrier, without too much affecting the quality of the finish, will help:

oil paint, which covers the walls on the final stage works;
applying 3-4 layers of special composition as a primer for aerated concrete;
using adhesives before applying the plaster. In this case, you can even do without the use of putty. Adhesives have the same properties and, in fact, replace it.

Features of work

To finish the aerated concrete with your own hands, you need to use the same tools that are needed for ordinary plastering. To prepare a plaster mixture, a special container is needed - such as a plastic tank or a bucket made of the same material. They should be large enough to accommodate all the ingredients for the plaster.

Water is added to the dry mixture that is poured into the tank. The mixture is mixed to the desired state with a drill with a nozzle or a construction mixer. As a rule, it is possible to determine the proportions of material and liquid by the inscriptions on packages with building materials.

Plaster of aerated concrete walls is applied inside the room by "throwing" with the help such tools as:

Master OK;
plastering bucket;
trowel.

The surface is rubbed with a trowel. And the excess solution from the wall can be removed with a half-scrubber. It is required to level the wall with the help of beacons, and to tighten the plaster mortar is the rule. Another tool that you cannot do without when performing work is a rail length from floor to ceiling. With its help, defects on the walls are checked - deviations of no more than 6-7 mm are considered permissible.

Plastering process

Having decided the question of how to plaster the walls of aerated concrete, they proceed directly to the performance of the work. They begin, like all surface finishing methods, with the preparation of the base. The blocks are cleaned of the mixture residues and the seams between them are closed. Before plastering aerated concrete indoors, a layer is applied to the porous surface.

Solutions for aerated concrete blocks, assuming the preservation of vapor permeability, also
they are able to pass steam, differing not only in high water-repellent properties, but also in the ability to strengthen the enclosing structures. The primer is required to be applied not in one layer, but in several. In this case, it must be taken into account that a new application is carried out only over a completely dried old one.

Anchoring the mesh for block reinforcement. Due to the large size of each aerated concrete product, the value of their adhesion to finishing materials small. And to increase the strength, reinforcement with a material is used, which contains an alkali-resistant fiber. Can be used for a gas-block mesh "chain-link" with small size cells. For its fastening, the use of 120 mm nails is required, which are well driven into aerated concrete;
If reinforcement is not used (it is necessary to decide whether a mesh is needed when plastering aerated concrete at the stage of choosing materials), the adhesion of the finishing layers to aerated concrete is ensured by grooves intersecting with each other, made by any suitable tools - for example, a hacksaw.
Application of the first layer of material (pre-selected, the better to plaster aerated concrete) on the mesh. In this case, the "spraying" technology is used, which ensures complete filling of the aerated concrete cells, and the leveling of the first layer is not carried out, which improves the adhesion to the next layer of plaster.

When applying the priming solution over the rough aerated concrete plaster, it is required to maintain the layer thickness at the level of 4–5 mm. The addition of slag sand to the primer is recommended. When applying the finishing plaster layer, it is advisable to use building material, which contains fine sand, which increases the smoothness of the blocks.

Outdoor and internal plaster walls made of gas silicate blocks have become a widespread type of finishing work due to widespread use this material in the construction of individual and apartment buildings. Products made of gas silicate provide good thermal protection of premises, significantly reduce the load on the foundation, but the technology of plastering requires knowledge of the purpose and behavior of each component involved in this process. Otherwise, the strength of the coating on the plastered wall will be less than expected.

Subtleties and tasks of gas silicate plaster

The task of correct plastering of walls is important precisely for gas silicate blocks, because, due to their specific structure, they have a very high degree of vapor permeability. Saturation of the entire mass of material with water vapor during the severe frost season will lead to the destruction of its structure by the expansion of ice crystals.

Reduce the intensity of the process to an optimal value that does not pose such a risk, and establish a comfortable balance of humidity and temperature in the house, the type of plaster used should be.

As an example, we can give the characteristics of a typical plaster mixture, summarized in the following table:

On the packaging of its products, the manufacturer indicates recommendations for the possibility of applying to certain surfaces. Usually on the front part it is indicated in large print whether it is intended this composition to plaster.

Principal points

In order to fulfill its function in full, it is necessary to comply with some requirements. They are associated with the characteristics of the material, which also appear after it has been laid in the wall structure.

Depending on the planned completion date of all construction work, the following points are taken into account:

The permissible humidity, which is inherent in gas silicate products at the exit from the production line, is up to 30%. The drying procedure for the entire massif takes at least 1 cycle of operation, therefore, after the first winter, blocks tend to appear large or small cracks. Before the start of finishing work, the laid out box of the building is kept, if possible, for about 1.5 years. If such a period is unacceptable, then it is better to first plaster these walls inside the house so that moisture can evaporate through the outer area accessible to air movement.
Cracking can also be caused by foundation shrinkage. Before plastering the walls, you need to let the house settle for 1 - 2 cycles of freezing - thawing of the soil. Otherwise, the cracks in the plaster will be deeply embedded in the main material of the walls and cosmetic rubbing will no longer be enough.
Air circulation outside is provided by using the operational capabilities of the ventilated facade of the house. Cladding different kinds panels (stone, wood, siding) or the use of a well brickwork, creates conditions for permanent removal of moisture vapor through a specially left air gap.
Do not use moisture-proof extruded polystyrene foam as an external insulation. It will retain condensation at the border of contact with the masonry.
Problems high humidity individual rooms in a residential building should not be solved only by plastering blocks and selecting a composition with exceptional characteristics. In the future, the walls in this room can be additionally protected with moisture-resistant tile glue or topcoats ( tiles, waterproof paint or vinyl wallpaper).

One of the options for the appearance of defects on gas silicate blocks 1-2 years after installation is visible in this photo:

The reason for the destruction is that a material such as aerated concrete needs reliable protection against aggressive effects. environment and destructive efforts:

mechanical damage;
precipitation;
ultraviolet radiation;
direct ingress of water;
weathering.

The porous material intensively absorbs water, which, expanding when heated or freezing into ice, breaks the cellular structure.

Means of protection will be waterproofing the basement, covering with a layer of plaster (outside and inside the building), arrangement of external thermal insulation.

The effective operation of gas blocks is largely determined by the consistent and high-quality creation of an internal vapor-tight barrier made of plaster.

Stages of aerated concrete plastering

Plastering walls made of gas silicate blocks should be started with a thorough impregnation of the entire wall area with a special primer. Unlike, which has a closed porous structure, during production, open pores are formed in the material, since fine aluminum crumbs are added to the base solution as an additive. It is the main gas generator for the reaction with the lime present in the liquid mixture.

The purpose of the primer in this case is to close the surface pores, prevent active absorption of moisture from the plaster solution (give it sufficient time for uniform hardening), and ensure high adhesion for strong adhesion to the surface.

The primer impregnation can be applied generously without gaps along the entire wall using a spray gun or roller, as in this photo:

Attempts to replace special compounds with simple spraying with water, as a rule, give a poor result in terms of the strength of the resulting plaster - the material absorbs moisture very quickly, and if it is soaked in a large number water, then he will not give it back.

Reinforcement

To prevent subsequent cracking of the plastering surface, to maintain the integrity of a monolithic seamless solid mass - this is the task ahead. In building mixtures based on cement or gypsum, there is a pronounced alkaline environment, therefore, fiberglass must be resistant to this category of substances.

During laying, gas silicate blocks form a fairly flat plane, which, if necessary, can be additionally leveled with a float with an abrasive nozzle, therefore, a sufficient thickness of the plaster layer is from 2 to 7 mm. A flat mesh is laid in it.

On walls of a large area (height), it may be necessary to level the plane with plaster vertically or horizontally. Then it is advisable to choose a more durable coarse mesh, as in this photo:

A flat mesh is pressed onto a thin (1 mm) layer of plaster or glue, which is covered with another layer of plaster mixture. The total thickness of the resulting coating should not exceed 1 cm.

Advice on how to determine the need to reinforce the internal plaster of walls from gas silicate blocks is discussed in this video:

Requirements of plastering technology

The external plastering work on the blocks begins only after the completion of the finishing work on the wall from the inside of the house, the completion of the wet mortar processes for the installation of floor screeds, plaster, and putty work.

All moisture that evaporates during these operations leaves not so much through ventilation and other openings (drafts are harmful here), but is actively absorbed by the surrounding materials and then seeks out through the pores of the gas silicate walls.

If the walls on the facade of the building are plastered prematurely, then the external protection made in the cold season will be collected at the border of the plaster and aerated concrete, freeze and tear off the plaster layer (shooting, flaking).

The decision of how to plaster the gas silicate is made taking into account the following factors:

Cement-sand mortar is poorly suited for this purpose for the following reasons: poor adhesion due to rapid loss of water (a primer will not always help); a significant decrease in the vapor permeability of aerated concrete (violation of the microclimate inside the house). For exterior decoration, the use of a cement-sand mixture prepared according to the usual recipe is simply unacceptable. This leads to a violation of the basic rule - the vapor permeability of a multi-layer wall must increase from the inner layer to the outer or be a comparable value.
A solution from a dry plaster mixture (for gas silicate blocks) must be prepared strictly according to the manufacturer's instructions indicated on the product packaging. The mixing container is taken of a sufficient size, maintaining the recommended proportions and water temperature with accuracy. The amount of added water is strictly dosed, since subsequently dilute the swollen plaster mix with an overly thick consistency is undesirable, and too liquid solution will drain. Stir evenly until smooth is best done electric drill with a special attachment.
In addition to strength, for external plasters, one should pay attention to the indicators of frost resistance and elasticity. Outside temperature changes create preconditions for cracks to appear in too rigid monoliths. We should not forget about the flammability class of the material - resistance to fire is an important indicator of the safety of a house.

Estimated consumption necessary materials and approximate prices for determining the budget structure are shown in the table:

Approach than plastering gas silicate blocks inside, simpler - for this purpose there is a wide range of gypsum compositions for interior work, which do not need to resist weather conditions.

You should not give up the procedure to plaster the room from the inside, limiting yourself to making a thin coating from one putty. The efforts expended should form a full-fledged wall covering.

Saving on cheap materials or on their quantity often leads to bad consequences. It can be argued with confidence that this is usually not a matter of bad building materials, but their misuse. If there is a need to plaster the gas silicate blocks of the outer walls, then this should be done using only specially provided materials for such types of work.

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

Aerated concrete wall plaster

Plastering of internal and external structures made of lightweight concrete is the most used method of protection from 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 set of works on the preparation and finishing of structures and to achieve the desired results.

Special characteristics of aerated concrete blocks

Aerated concrete refers to aerated concrete, consists of quicklime, cement, sand and gas-forming aluminum powder. When mixing the 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 the scope of use:

Concrete with a density of 300-400 (kg / m3) is used for thermal insulation.
Density 500-900 (kg / m3) can be used for the installation of partitions and walls.
With a density of 1000-1200 kg / m3, concrete is used for the manufacture of 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 concrete, 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 insulation 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 is important, because the more cement, the higher the strength, and the base must be stronger than the coating, otherwise it will flake 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 made of gas silicate blocks is to form a vapor-impermeable barrier and limit moisture absorption. To improve the adhesion of the coating to the base, the structural elements are covered with a deep penetration primer, the first layer is applied generously, preferably with a spray gun, after drying, you need to paint over again.

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

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

The use of glue instead of a conventional solution is associated with polymer additives in the composition, which provide strong adhesion 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 mesh is overlapped on the applied adhesive and pressed in with a notched trowel.

It is advisable to start applying the solution in 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 no more than one centimeter is applied to the reinforced surface.

Manual plastering technology is common, if the wall is large and uneven, beacons are installed and the applied layer is equal to a broad 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, the gypsum sets after 20 minutes, the cement takes a little more time, so the amount should be sufficient for production during this time. It can be leveled immediately after covering, the last step is grouting.

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

Do I need to plaster the gas block outside

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

The hygroscopicity will lead to the saturation of the 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.
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.

Materials used for outdoor work

For the application of protective agents outside, substances with the following properties are required:

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, reinforce loaded structures, plinth.
Silicate, include liquid glass;
Silicone based on organic silicon polymers, well suited for facades, but high price;
Plaster mix;
Lime-cement composition.

Do-it-yourself internal plaster of the 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 provide for the reinforcement process. It is recommended to use a fiberglass mesh that does not degrade in an alkaline environment.

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

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

Which is the best plaster

If vapor permeability is required for kitchen, bathroom or sauna rooms, mixes of gypsum with perlite sand are used. Silicate is also suitable, but it must be borne in mind that such mixtures are incompatible with acrylic, silicone, latex materials.

For use on aerated concrete, you can use cement-lime mixtures, which do not require wall priming.

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.
Primer brushes, rollers.
Master OK.
Tank for mixing the solution.
Mixer for solution preparation.
Falcon, a shield where the mixture is applied.
Grout grater.
Half-eater.
The rule of thumb is to align corners.

How to plaster: work progress

Ready-made mixtures are great for decoration, but they have a high cost, therefore, a wall preparation technology is proposed for do-it-yourself work, after which you can safely use any composition.

For preparation, you will need tile adhesive, fiberglass mesh, and a deep penetration primer. It is necessary to fill all chips and cracks with a compound 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.

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

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

How long can you go to the next stages of wall decoration

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

To proceed to the next types of finishes, you must wait until the walls are completely dry at a constant temperature. Drying will take about a month during 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 finishing of the house is an important stage of construction work, on the quality of which depend on durability, comfort of living and aesthetic appearance Houses. For finishing work, there are many modern materials and technology, but traditional methods, do not lose popularity and are still relevant at the present time. These methods allow you to achieve the required results at low cost and labor intensity.

Useful video

But it differs from them in the composition of the air bubbles inside.

Aerated concrete blocks are made of cement with a mass fraction of at least 50%.

Aerated concrete walls need external and internal finishing due to their porosity and high level of moisture absorption.

Features of aerated concrete

This building material has a cellular structure, which gives it special properties:

good thermal insulation - in terms of characteristics, aerated concrete is comparable to wood;
low mechanical stability, which leads to the appearance of cracks and chips over time;
the porous material is blown through by air currents, which is why houses made of it without finishing are considered rather cold;
unaesthetic appearance;
high absorbency leads to corrosion of the material in winter, during frost.

The special structure of aerated concrete blocks requires careful processing with finishing materials to improve its quality characteristics. External plastering is performed using special solutions that are selected for specific environmental conditions. Correct plastering of aerated concrete walls provides reliable protection of the base and its durability, and also allows you to give a more aesthetic appearance to the room.

How and with what to plaster aerated concrete indoors?

Regardless of the choice of the type of plaster, you need to start finishing work indoors. Changing the order and plastering the facade of the building will lead to excess moisture in the room. The fact is that when steam leaves the room, especially in winter, condensate accumulates between the blocks and the finish, creating places with excess moisture. This is the main cause of surface cracks and plaster shedding. To avoid such troubles, you should first tackle the plastering of the walls from the gas blocks indoors. Experienced craftsmen distinguish two types of technology for plastering aerated concrete walls in a house:

providing complete vapor barrier;
preservation and increase of vapor permeability of the material.

The main element of aerated concrete plastering using the first technology is polyethylene film. It is fixed between the layers of mortar, and the vapor permeability of the walls decreases several times. Also used for vapor barrier oil paints, which are applied as a finish, and priming the base with special compounds.

Dependence of inside plastering technology on external finishing

To accurately determine the approach to internal work, you need to decide on the external plastering. Plastering of aerated concrete walls outside the room affects the method and sequence of actions for finishing the room:

When the outer wall already has some kind of coating or is insulated with dense and vapor-proof materials, then moisture will accumulate in the walls. In this situation, interior decoration is carried out using materials with low vapor permeability. You also need to take care of reliable system ventilation so that moisture does not accumulate in the corners of the room and on the windows.
When the aerated concrete facade is not covered with anything, or is treated with porous insulation, for example, mineral wool, then its vapor permeability is not disturbed. In this case, you must first carry out work on the interior decoration of the room, and then move on to the outside.

Preparation of the base

The technology of plastering walls made of aerated concrete practically does not differ from work with any other surface. First of all, you need to make sure that the walls are even, and if this is not the case, grind them with a plane or a grater for aerated concrete. Many craftsmen skip this stage, but as a result, the costs of plaster increase, which is also used to level defects. Before applying the primer, aerated concrete walls are moistened with water. For drier rooms, it is recommended to choose a universal composition, and for the kitchen and bathroom - a deep penetration soil. \

Construction beacons are mounted on the dried surface, which will serve as a guide for the successful plastering of the room. After installing the lighthouses, the internal plaster of the walls made of aerated concrete will lie flat, and the work will move faster.

The technology for finishing the facade of the building is somewhat different in standards. First, the walls are cleaned of dust and leveled. Crevices and cracks are filled with a special aerated concrete adhesive. Once dry, apply a layer of Cellular Primer An important stage preparatory work for plastering the facades of buildings made of aerated concrete, the surface is reinforced with a mesh. When choosing the type of reinforcing mesh, it is necessary to pay attention to the fact that under the influence of an alkaline environment, the material from which it is made can dissolve. Experts recommend choosing fiberglass types.

Aerated concrete plaster (video)

How to plaster aerated concrete surfaces

In order for the repair of an aerated concrete house to serve for many years, it is necessary to correctly approach the choice of material for decorating the walls inside and outside. Masters distinguish as many as four options for processing walls made of cellular material:

Gypsum plaster.
Cement-sand mortar.
Facade mixtures.
Drywall.

The last option is the so-called dry plaster. What better drywall or plaster on aerated concrete walls is a controversial issue. Plastering a surface is a costly and time-consuming process. Working with gypsum board takes less time and, as a result, smooth walls are obtained. Procedure:

vapor barrier of surfaces using polyethylene film, membrane or glassine;
installation of the lathing for fastening the gypsum board;
fastening drywall to the frame;
putty of joints between sheets using serpyanka tape.

Any kind of aerated concrete wall leveled in this way can be applied decorative finishing... What plaster is better to plaster aerated concrete walls? To answer this question, it is necessary to know the specifics of the solutions and their interaction with the base material.

Disadvantages of different types of plasters

Name	Flaws
Cement	Low level of adhesion in relation to the gas block
	High moisture content
	The vapor permeability index is lower than that of the aerated block, therefore, the cement mortar can only be used when used for interior decoration of vapor-proof materials (plastic film, etc.)
Gypsum	Gains moisture during snow and rain
	Stains on the plaster
	Low vapor permeability
Facade	The only drawback of this type of plasters is their high cost.

Gypsum plaster

The main advantages of a gypsum solution for treating aerated concrete walls include:

fast drying;
high rate of adhesion level;
there is no need to apply an additional smooth layer;
the possibility of leveling the plaster for finishing.

Knauf Rotband, Bonolit and Pobedit Velvet are popular among the craftsmen.

Cement-sand plaster

If this option was nevertheless chosen for finishing aerated concrete walls, then there are several ways to improve the composition for better interaction with the base. Adhesion can be increased by adding more cement mortar to the standard mix recipe (for 100 kg of concrete, 8-10 kg of lime will be needed). The second option, which is acceptable, but still not recommended by the masters, is to add a mixture for processing aerated concrete to the cement-sand plaster (1: 1 ratio). Among the leaders in sales of mixtures of this type are solutions of the Baumit brand and the domestic Craps Extra-light.

Facade solutions

This type of mixture, in the case of aerated concrete, is suitable for both indoor and outdoor use. The main positive aspects of working with special plasters for aerated concrete:

high adhesion rate;
resistance to deformation and cracking;
vapor permeability is equal to that of aerated concrete;
nice view;
does not require additional finishing work.

Plastering walls on aerated concrete with your own hands is demonstrated in the video below. With a competent approach to work and the study of materials, even a novice master will cope with plastering a house from aerated concrete blocks.