How to plaster a wall of aerated concrete with your own hands. Plastering the exterior walls of a house made of aerated concrete by machine. We prepare the necessary tools and building materials

Aerated concrete, as a material, appeared about a hundred years ago. However, in our construction market, aerated concrete was brought in mass access much later.

This is a lighter and more convenient material in processing, from which you can assemble load-bearing structures and engage in the construction of low-rise buildings.

However, aerated concrete has several features that should be considered during its processing. In particular, this concerns the choice of material to be used for plastering. aerated concrete walls. Below we will take a closer look at how to plaster aerated concrete and all the nuances of such work.

Features and purpose

To begin with, let's figure out what aerated concrete actually is. In its structure, aerated concrete is very similar to standard concrete. It is poured in the same way using a binder, filler and water.

However, the pouring technology is slightly different due to the fact that aluminum powder or powder is also added to the mixture. When reacting with water, aluminum begins to release an excess amount carbon dioxide, which fills the entire mold cavity and makes the solution bubbly.

As a result, the concrete solidifies, having inside many small cells ranging in size from 1 to 3 mm. When the technology for creating an aerated concrete block for a house was invented, everyone thought that in all respects it would defeat ordinary concrete and become more popular for work, taking over the entire building materials market.

However, such thoughts were premature. Of course, if we compare what type of material better in terms of ease or ease of processing, then cellular concrete will win. It is better finished and processed, as it has a specific structure. It is also worth understanding that a properly created aerated concrete will be better able to withstand temperature drops.

And it is also well characterized by a vapor-permeable structure. That is, concrete, in fact, forms a breathing wall. Unlike the usual cement mortar, which in these parameters is no different.

But aerated concrete also has its drawbacks. In particular - an indicator of strength. If we make a comparison solely on this indicator, then standard concrete will win here.

The construction technology allows you to build buildings of any height from it, while in most cases it is allowed to build buildings up to 10 meters high from aerated concrete. Of course he's 4 or 5 storey houses I'm sure it will work, but it's not worth the risk.

Also, aerated concrete absorbs moisture more strongly. Moreover, when you hold it, negative processes begin inside the block. This affects what composition of the mixture the plaster for aerated concrete should have.

The surface of the gas block from which the houses are assembled also has its effect. The fact is that initially it has rather weak adhesion with individual solutions. thin layer gypsum plaster aerated concrete walls, if you do not select mixtures special purpose, can generally collapse in a matter of months. Well, or a good crack, which is also unacceptable.

It follows from this that mixtures to perform plastering works for aerated concrete must be special and meet several requirements at once.

1.1 Requirements for plaster

So, plaster for aerated concrete should be slightly different from the standard. Moreover, we immediately note that using ordinary plaster when performing work on finishing a house from aerated concrete, it is completely prohibited.

This is explained by the fact that standard sand solutions are too dense. They do not fit well on such surfaces and quickly crack. Their even more unacceptable property is their weak vapor permeability or its absence. This leads to quite negative consequences.

If you plaster standard concrete or brick houses, then there is no problem. But at home from gas block Ytong – this is a completely different conversation.

Here in the popularity race without fail plaster with a vapor-permeable base will win. Otherwise, the steam that exits the house will be blocked by a layer of finish from the outside, and get stuck inside the walls. The dew point in the house will move to their center, which will lead to the accumulation of moisture.

Nothing bad will happen in one year. It won't happen in a couple of years. But 5 years of such operation can already lead to the beginning of the process of destruction load-bearing structures Houses.

Now we note the specific requirements that the plaster on the gas block must satisfy. She must be:

Vapor permeable.
Moderately dense.
Protect the wall from external influences.
Moisture resistant.
Improve wall insulation.
It is good to lay down on aerated concrete.
Be easy to handle.

As you can see, there is nothing extraordinary in such a list, but it is better not to ignore any of these indicators.

2 Types and differences

Now let's turn to the main types of plasters for aerated concrete blocks. If you are going to make the right choice, then you will have to figure out which mixes are best suited for which jobs. Fortunately, there are no major differences in most cases.

By type of application there is plaster:

outdoor;
internal.

Exterior plaster, as you know, is intended for facade decoration. Outside the house, it must perform protective functions, so the mixture is characterized by more high performance strength, water resistance and improved thermal insulation. The cost of compositions for finishing gas blocks outside will also be higher.

Internal samples are intended for work indoors. They no longer need water-repellent properties, unless we mean mixtures that are intended for bathroom decoration.

This naturally reduces their cost. However, if we compare plasters according to the main parameters, then, of course, the first option will win.

2.1 Popular plaster compositions

According to the type of composition they are divided into:

lime-cement;
acrylic;
silicate;
silicone.

In the first version, the main element is lime. She replaces sand mortar, making the final composition of the mixture quite durable, but at the same time with the possibility of vapor permeability.

Acrylic plaster will win if you need to choose a composition for decorative finishes. It is the most durable and reliable, capable of forming an extremely tenacious finished surface.

The problem with acrylic is its poor vapor permeability. Outside the house, such mixtures can only be used after thorough work on insulating the walls from the inside of the building. Inside, the plaster is not so dangerous, but it will prevent the passage of vapors through the walls, and hence the self-regulation of the microclimate in the room.

silicate compounds are much better than the first two. If you apply them correctly, then you will not have any problems in your work. They are vapor permeable high density and are easily processed. The problem with silicates is quite a small choice of color prices and dust settling on the plaster layer, what is not in the best way affects his appearance.

As for silicone samples, they are the undisputed leaders when it comes to the specific qualities of plaster mixtures. They have all the advantages of silicate compositions, but at the same time they are very durable and look great. The only negative, as you probably guessed, is the high price.

The choice of plaster must be approached with great responsibility. It is the choice that affects what results you get in the end. Remember that you always need to find a compromise between cost and performance. But it is better not to go too far, buying the cheapest option.

If you are going to finish the walls inside the house, then in a pinch, ordinary lime-cement compositions will do. Of course, in terms of their characteristics, they will be inferior to everyone else, but interior decoration does not require anything extraordinary from the plaster mixture. And you will save a decent amount.

Acrylic plasters are best used only for decorative finishes inside or outside the house. Moreover, if you are going to use it outside, then here you already need to take care of high-quality vapor barrier inside the house, as well as the arrangement of normally functioning ventilation.

Silicate compounds are great for any type of work, but after plastering, they must be finished in a mandatory manner with another layer of putty in order to level the problem with colors and dust emission.

With silicone substances it's even easier. It is difficult to name a method of their application that would be considered unacceptable. In any situation, such mixtures will perfectly fulfill their purpose. The only barrier is the price. It's up to you to decide.

As for specific manufacturers, the most popular on this moment are Profit, Ceresit Atlas, etc. In particular, their products are known on the market:

Ceresit CT 24;
ATLAS KB-TYNK;
Profit Contact MN;
Sh-36 Decor.

2.3 Technology for finishing walls from a gas block

As an acceptable and simplest technology for plastering walls, we choose to work with the help of beacons.

Our grandfathers also used lighthouses, although they adapted wooden planks for this purpose, and not small ones. aluminum profiles. However, this technology has proven itself better side, and not just like that.

Before starting work, it is necessary to prime the walls from the gas block. For this, special primers are used, which by themselves can slightly reduce the water absorption of the material, improve it thermal insulation properties and adhesion.

Then you can apply beacons. Beacons are mounted on small solution bubbles. They are laid in increments of 1-1.5 meters. Each beacon is set to its own level, and the next beacon.

Aerated concrete is gaining more and more popularity as a building material. And this is not surprising. Big sizes blocks can significantly reduce construction time, and the cellular structure retains heat, allowing you to reduce heating costs. But this material requires serious protection from moisture.

Aluminum powder is added to the main solution from which aerated concrete is made. At one of the stages technological process, this component releases gas, forming cells filled with air. AT this case the pores remain open, and moisture quickly accumulates in them.

Therefore, the material is protected from precipitation both at the stage of building walls and after the “box” of the house is ready. Moisture accumulated in autumn or spring time, will also quickly leave under the influence sun rays. But in winter this factor will be destructive. And over time, small cracks will appear on the walls, and then peeling.

In addition, aerated concrete has the following characteristics:

Low thermal conductivity.
Strength depends on the foundation. If it shrinks strongly, then cracks will soon appear on the gas block.
Durability if the material is protected from water.
Fire and environmental safety.
Soundproof properties.
High vapor permeability, which makes the home comfortable, because the internal vapors quickly escape to the outside, and do not accumulate in the premises.
High rates of moisture absorption, which forces the house to be lined with moisture-repellent materials.

When is the best time to plaster aerated concrete walls?

Most often, plastering is chosen for finishing gas-block walls. But you should choose the right time to do the work, as well as suitable composition. We will deal with the type of plaster for the facade a little lower, and now we will consider the time of holding finishing works.

Do not plaster immediately after erection. The walls are given time to dry completely and shrink. Enough to wait a year. If this is not done, cracks will appear on the finish.
Pick up warm time year, when the night temperature does not drop below 0 degrees. In such a situation, the moisture that the aerated concrete absorbs from the solution will quickly be released, and the finish will dry.
To protect the walls in winter from moisture and frost, they are covered with deep penetration soil. Under such protection, the house will withstand the load of one frosty season without changes in the structure.
As a barrier to unlined walls fit and polyethylene film.

Do I need to pre-insulate the outside?

As mentioned above, the walls of this building material retain heat well. Therefore, with a competent calculation of the thickness of the structure, there is no need to insulate the house. It is better to do this with the help of professionals. They take into account the climatic conditions of the region where the building is being built.

You should not make the walls too thin so that they need to be additionally insulated, since it will be difficult to choose a heater. The aerated concrete structure has high vapor permeability, and if the thermal insulation does not cope with this task, then condensate will appear with outer side walls. This will lead to both the destruction of aerated concrete and insulation.

If it is already necessary to perform insulation, then choose a material that can pass steam from interior spaces. According to the rules prescribed in the State Acts, the steam capacity from the inner walls to outdoor decoration should increase. Only in this case it will be comfortable to be in the rooms, and mold and fungus will never settle on the walls.

What mixtures are best to use?

When choosing a mixture for plastering gas-block walls, the presence of the following properties is noted:

Moisture repellency.
Good adhesion to the base.
Resistance to low temperatures.
Elasticity.
Decorative.

Range construction stores offers several types of plaster mixtures. All of them have positive and negative aspects to use. It is especially important to use for plastering aerated concrete suitable options. Therefore, we will consider each type separately.

Lime-cement

This is an example of thin layer light plaster. It is used only for interior work. Not worth the usual cement mortar. He does not have required characteristics to preserve the properties of our material. But with the addition of lime, everything changes:

The mixture adheres well to the base.
Apply in a thin layer.
The vapor permeability of the solution increases.
The finish is durable.
Inert to the appearance of mold fungi.
Affordable low cost.

There are, of course, several disadvantages:

The finished solution quickly hardens, therefore it is difficult to work with it, especially for a beginner.
Great expense for square meter implies an increase in costs, even at a low cost of the product.
The solution is prepared independently, since only a dry mixture is sold.

Acrylic

This option is used for decorative facade decoration gas block houses. It is applied in a thin layer, but at the same time it has a number of advantages:

durable;
elastic;
resistant to low temperatures;
color retains its original brightness for a long time;
helps to strengthen the base in places where the load is increased;
repels moisture.

Despite the large number of advantages, there are such disadvantages that raise great doubts about the correct use of acrylic compounds for aerated concrete:

Low vapor permeability. Waterproofing is installed on the base or a ventilation system is being built in the house.
The acrylic composition is highly flammable, therefore it is not suitable for wall sections near fire.
High price.

silicate

Great for both interior and exterior finish compositions based on liquid glass. This plaster is sold only in ready-made. Mix it thoroughly before use. The main advantages are:

vapor permeability;
water-repellent properties;
a large selection of textures;
affordable price.

But before plastering aerated concrete, it is worth exploring the disadvantages that exist here, like any other material:

Dirt and dust accumulate on the surface of the finish, which reduces the attractiveness of the coating.
A small selection of colors and shades.

Silicone

This option is made on the basis of silicone emulsions or resins. It is great for facade wall decoration. It has such undeniable advantages:

Hydrophobicity (repels moisture, practically does not get wet).
steam permeability.
It is convenient to apply, therefore it is suitable for those who decide to do everything with their own hands.
Plastic.
Crack resistant.
For a long time retains the original color.
Easy to clean from dust and dirt.

Of the shortcomings, only the price is noted, which is an order of magnitude higher than the previous options. But is it worth saving your time and day, if the material has so many advantages.

Cement-sand

most famous and affordable option plaster mixtures, which is perfect for different bases. But aerated concrete does not withstand the use of a cement-sand mixture. It all stems from the lack of certain characteristics.

Is cement mortar suitable for this purpose?

If a beginner takes up the matter, then he should study all the intricacies of plastering aerated concrete. One of these nuances is the impossibility of using a conventional cement-sand mixture. The reasons for this are as follows:

Low steam transmission capacity.
The solution has a large amount of moisture. The gas block quickly absorbs water and then gives it away for a long time, which increases the term of work. In addition, cement plaster with rapid evaporation of moisture loses its strength, as a result of which cracks appear.
Aerated concrete has a smooth surface, and the cement-sand mixture has low adhesion rates. Therefore, the solution clings poorly to the base and can slip during operation. To avoid this, the walls are coated with a primer for aerated concrete, but this does not always help.

Add lime to the usual solution.
Mix a special mixture for a gas block and a cement mortar in a ratio of 1x1.

And glue for porous concrete?

A special adhesive mixture, which is intended for laying aerated concrete, should also not be chosen as a material for plastering walls. Although the glue is designed taking into account all the nuances of using a porous material, it is not suitable for plaster:

It is applied only in a thin layer.
Designed for grouting.
Does not have the ability to pass steam. Which leads to the appearance of condensation on the inner walls, and then mold.

Such material is used only for its intended purpose.

Interior decoration

It is customary to perform internal alignment of walls with plaster first. Thus, the moisture that is absorbed from the solution will quickly leave the thickness of the wall. on the internal walls from aerated concrete are not much different from plastering other surfaces. Follow this plan:

Foundation preparation. Removal of bumps and other irregularities. It is better to do this when the walls are being erected, since in the future this leads to an increase in the wastage of the mortar.
Padding. It is advisable to choose a deep penetration primer, especially for rooms with high humidity such as bathroom or kitchen. Never dilute the primer with water. This reduces the quality of the soil layer.
- help to control the thickness of the applied layer. The distance between elements is slightly less than the length of the rule.
Spraying or spraying the first layer. The solution should not reach the top edge of the beacons.
Formation of corners with a perforated profile with a reinforcing mesh.
Application of the second layer. The thickness will be less. The solution is also thrown, but immediately leveled by the rule. At the same stage, beacons are removed.

If the surface is to be painted or covered with wallpaper, then the surface should be made perfectly smooth. For this, apply finishing layer and rub it down.

Outdoor

After interior work will be completed, proceed to the improvement of the facade. Be sure to check the dryness of aerated concrete. applied plaster on wet walls, may peel off. It is also important to choose the weather conditions:

The optimum temperature is from +5 to +25 degrees Celsius.
Lack of wind.
Humidity is not more than 80%.
The walls are best hidden from direct sunlight.

Wall preparation

Aerated concrete has a smooth flat surface, and therefore it is not necessary to align the walls additionally. But during the laying process, small voids sometimes appear in the seams or chips on the blocks. They are sealed with the same glue on which the material was laid.

All flaws fill the solution and leave to dry completely. Therefore, the treated areas are rubbed with a metal float in order to remove the protruding solution. Dust is removed with a brush or a damp cloth, but make sure that the material is not too wet.

Padding

For priming facade walls choose deep penetration compounds. They create a strong film that prevents the absorption of moisture, but at the same time the steam passes through smoothly. Also, an additional layer will increase the adhesion of the plaster and the base.

Apply primer in several layers, depending on climatic conditions terrain. To do this, use a roller or brush. The composition completely covers all the walls without bald spots. If there are corners or other inaccessible places, they are treated with a small brush.

Plaster and reinforcement

Reinforcing mesh must be used, even if the layer is small, about 1 cm, and the base is well treated with soil. This will make the plaster layer durable and reliable. Choose a glass fiber product that is alkali resistant.

Reinforcement and plastering are performed simultaneously, following this plan:

Cutting the grid into strips.
Preparation of the solution, according to the instructions indicated on the package, if a dry mixture was bought. The finished solution is simply mixed so that all components are evenly distributed.
A solution is collected on a wide spatula and evenly distributed over the surface, about 0.5 cm thick.
A special perforated profile with a reinforcing mesh is applied to the corner. The grid is smoothed over the applied solution.
Next, separate pieces of the grid are laid. Be sure to make a whip of 5–10 cm. The reinforcement is smoothed by immersing it in a solution. In places where it looks through, add a little mixture and smooth again.
Surface treated small areas with the expectation of full use of the finished solution.

After the entire facade is plastered, it is left to dry completely. There should be no flaws and protruding reinforcement on the surface.

Finishing layer

As finish coat choose decorative composition. The solution is either prepared according to the instructions, or mixed in a container. Apply with a wide spatula. The layer does not exceed 0.5–1 cm. At this stage, they work especially carefully, since the remaining flaws will be noticeable.

When the layer dries a little, it is overwritten and either a smooth surface or texture is created, respectively. Then the layer should dry completely and only after that you can start painting, if necessary. , in this case, is as carefully selected as the plaster mixture.

Currently, such building material as aerated concrete is becoming more and more widespread. For the construction of a low-rise building, it is optimal 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 machining hand tool, high fire safety.

However, after completing the main construction works the question of further interior and exterior decoration of the house inevitably arises. Exist different kinds finishes, but it was plaster that was most widely used. Let's try to figure out how to plaster aerated concrete inside the house.

Plaster options for finishing walls made of aerated concrete

In addition to the above advantages, which ensured the popularity of such building material, it also has disadvantages that require the implementation of a number of additional rules during the finishing work. 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 plaster. Exactly high level adhesion significantly complicates the process of finishing both inside the house and outside. There are three options for plastering walls made of aerated concrete:

Cement - sand;
plaster;
Front.

It is important to note that no matter what material you choose for plastering, the finishing of aerated concrete walls should begin with interior 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 the 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 consider what material will be most suitable for plastering your particular home.

Cement - sand plaster. Often, many people ask themselves: 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. Provide an optimal microclimate in aerated concrete house is possible only if the vapor permeability of the finishing material is equal to or exceeds the performance of aerated concrete.
With significant moisture absorption rates, aerated concrete will intensively absorb moisture from the sand-cement mortar, and this will significantly reduce the quality of the plaster, since the acquisition cement plaster optimal parameters strength is possible only under the condition of slow and uniform drying.
Low adhesion and high specific gravity solution exclude the possibility of its reliable adhesion to the material.

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

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

To disadvantages gypsum mixtures relate:

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

Despite these shortcomings, plastering aerated concrete with gypsum is quite acceptable.

Front. This type of plaster mixture is optimal for plastering aerated concrete indoors and outdoors. 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 the house from aerated concrete

Currently, there are a large number of ready-made dry mixes for wall plastering. When choosing a material for plastering work, the following factors should be considered:

The plaster mixture must have parameters good vapor permeability, at least equal to the parameters of aerated concrete;
An excessive amount of water must not be used to prepare the working mixture.
The selected mixture must have a high coefficient of adhesion to the base;
The plasticity of the plaster should provide the walls with resistance to cracking;
The frost resistance of the selected mixture must correspond to climatic conditions;
The time until 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.

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

In conclusion, I would like to remind you that regardless of how to plaster aerated concrete, compliance with the technological regimes indicated by the performer of the plaster mix is directly related to the quality and durability of the work being done. Do not neglect the preparation of the base. Preliminary removal of various masonry irregularities will allow you to significantly reduce the layer of applied plaster on aerated concrete, and, consequently, its consumption.

But if such wetting occurs in winter period, then this can lead to the development of a destructive process. The fact is that when freezing, water tends to expand, and therefore the blocks will appear small cracks, which will not only spoil the appearance of the facade, but also significantly weaken the supporting structure.

The process of preparing walls, from gas silicate or aerated concrete blocks, for applying cement-based plaster

Facade plaster - the best choice for aerated concrete

Of all the options present on the modern construction market, it is facade plaster is exactly the material that most closely matches technical specifications aerated concrete. She possesses optimal performance vapor permeability, has excellent adhesion and attractive appearance. Because such aerated concrete plaster will be the best choice for finishing walls made of gas blocks.

Consider its main advantages over analogues:

High rates of vapor permeability, which allows gas blocks " breathe».
The minimum amount of water required to mix the mixture. This indicator should not exceed 0.2 liters per 1 kilogram.
Resistance to low temperatures.
Excellent adhesion.

Crack resistance.
Long viability of the solution.

Which plaster is not suitable for aerated concrete and why

One of the most popular types plaster is a cement-sand mixture. However, it is completely unsuitable for working with gas blocks. Regardless of what material the blocks themselves were laid on (adhesive mortar or cement), the use of this finishing material is unacceptable for the following reasons:

The vapor permeability of cement is lower than that of a gas block. This is the main reason why the use of plaster of this type should refrain.

The moisture content is also important indicator for gas blocks. In a cement-sand mortar, it is increased, since for its mixing it is necessary to add quite a large number water. Since aerated concrete is characterized by high moisture absorption, it will absorb water from the solution, which can not only destroy the structure of the blocks themselves, but reduce the quality of the plaster solution.
Cement mortar is characterized by low adhesion. This is due to the large weight of the solution and the presence of large impurities in its composition.

Gypsum plaster is a good option for plastering aerated concrete walls. But at the same time, it has a number of disadvantages before the facade:

The vapor permeability of such compositions leaves much to be desired.

Manifestation white coating- efflorescence

When it snows or rains, such compositions are distinguished by fairly rapid wetting.
On such a surface, spots may appear that need to be painted over.
Contains large quantity water than specialized plaster mixes for aerated concrete.

The best time to apply plaster

Considering that aerated concrete has a high water absorption, it needs to be provided good protection from getting wet. As mentioned above, the wetting of this building material is not critical, if frost is not predicted. In any case, after laying the walls, you need to give time to dry. It is enough to wait about a month and you can apply the plaster mixture.

Ideally, plastering of the facade of a house made of aerated concrete is carried out in the warm season. If it is impossible to perform these heat work, then the walls should be covered with a deep penetration primer. It will reduce water absorption. It is also desirable to protect the walls using polyethylene, which is left over from the packaging of aerated concrete pallets.

Masters advise to carry out work during the period when the air temperature at night does not fall below zero degrees. Thus, it is possible to plaster the walls from the end of March to the beginning of November.

How to plaster the walls of a house from gas blocks

One of the main misconceptions is that the main task of plaster is to protect the walls from the outside. The only problem is that if such walls are not primed, then with the advent of spring they will “give up” the accumulated moisture. And since there will be a layer of plaster outside, all the moisture will go inside the house. As a result, cracks on the inner walls are possible.

Advice! Protection Priority external walls exists only if the construction of the house takes place in close proximity to the sea, lake or any body of water.

Carrying out simultaneous finishing of internal and external walls is also unacceptable. The fact is that in this case, the moisture that the gas block will somehow pick up in itself, in this case, simply will not have any way out. And its settling inside the block will only accelerate the processes of its destruction.

Yes, plaster for outdoor work on aerated concrete has good performance vapor permeability. But still they will not be enough to quickly remove moisture.. And this becomes especially critical when the average air temperature at night drops below zero. As a result, the gas block will begin to quickly collapse.

Considering all of the above, it should be noted that the most profitable and the right option is like this: first applied internal plaster, and after drying this layer - the outer. In this case, the moisture accumulated inside the aerated concrete blocks will have an outlet to the outside, which will not bring negative consequences for the building itself.

How to do interior decoration

Consider the sequence of work on interior decoration aerated concrete walls:

Preparatory stage. First of all, the walls must be properly prepared: leveled, for which a special planer for aerated concrete is used.

We apply a primer. Some masters suggest diluting the primer with water in a ratio of 1 to 1, which is incorrect, since it negatively affects the adhesion of the material. The primer composition is selected depending on the purpose of the room. For example, if a deep penetration soil is required for a kitchen or bathroom, then any universal material can be taken for the hallway.
Installing beacons. They allow you to adjust the thickness of the applied solution. Arrange them according to the width of the rule, and the accuracy is controlled by the level.
We throw a starting layer or "fur coat". Work should be carried out from the bottom up. Next, we describe the rule for beacons, aligning the resulting layer. When voids form, they are immediately closed.

Processing the first layer. After the applied plaster dries, it is necessary to moisten it with a spray gun, and then level it. At the same time, it is desirable to dismantle lighthouses, since they are cold bridges. The recesses formed after them are immediately sealed with a solution.
We form the corners. To create even and strong outside corners, use perforated corner, which is installed on a small section of the grid and smeared with composition.

Applying the final layer. Grouting is carried out if necessary, then paint can be applied to the walls. Finishing walls are not carried out if they are subsequently covered with wallpaper.

Since the paint is also characterized by certain indicators of porosity, it is necessary to approach its choice with all care. Good options are compositions based on latex, PVA, acrylic emulsions, cement and paints based on organic solvents.

How to plaster walls outside

How to plaster aerated concrete outside? best material for such a finish is decorative facade plaster. There are two application options here:

Thick-layer finishing, providing for the application of the material in one thick layer.
Several layers involve thin-layer plaster. This option for wall decoration will be discussed below. It involves the application of a finishing material with a thickness of not more than 10 mm.

External plaster is applied as follows:

The wall is being prepared. We are talking about leveling the surface, which is done in order to reduce material consumption.
Before plastering, the wall must be properly primed.
After that, the starting layer of the mixture is applied. In thickness, it should not exceed 5 mm.

The finishing layer is reinforced metal mesh with small cells. It is overlapped by 50 mm. At this stage, the corners of the house are also formed, for which a perforated corner is used. The main task of the grid is to prevent the formation of cracks in the plaster layer, which may occur during the shrinkage of the building.
To "drown" the grid in the solution, a spatula is used.

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

In particular, before plastering aerated concrete from the outside, it is necessary to complete all the “wet” internal work, select the appropriate composition and calculate the thickness of its application. All this will be discussed in more detail in the article.

Features of aerated concrete and its finishes

The composition of aerated concrete is similar 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 unfinished for many reasons.

For example:

Impact of 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;
Settling of airborne dust. She, like rainwater, has an acidic character, and prolonged exposure to an acidic environment causes a darkening of the surface and leads to deterioration appearance blocks.

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

But most often, a special facade plaster for aerated concrete is used for protective and decorative finishes. Its main purpose is to protect walls from the factors listed above, but at the same time, the coating should not reduce their vapor permeability, preventing the diffusion of water vapor from the inside to the outside.