Facade plaster for aerated concrete. Plaster for aerated concrete: features of internal and external How to properly plaster aerated concrete outside

24.11.2019

Repairs inside or outside the premises will not do without plastering walls and other surfaces. At the design stage it is necessary to familiarize yourself with the features of plaster, which are divided into types, they differ in characteristics and price. The right kind finishing material is half the battle, because Mixture characteristics can vary significantly., and what is ideal for one type of room may be completely unacceptable for another.

Some features of plaster

Plaster is a mixture that is used for surface treatment as a rough finish. What are the functions of the material? With the help of plaster, you can level the walls, repair cracks and other defects. Herself the structure of this solution is a coarse mixture, so after drying the surface will have rough surface. These effects can be easily eliminated in the future.

You can plaster walls of almost any type, concrete and wooden structures will be protected from the harmful effects of factors environment. Various techniques and materials are used for plastering walls made of aerated concrete. Trends in the field of construction are developing in such a way that such building material as aerated concrete is becoming increasingly popular. It has a lot of advantages in comparison with concrete and brick construction.

The building, erected from aerated concrete, has increased energy-saving properties. This material is much lighter than traditional analogues, due to this fact, it is possible to reduce the cost of arranging the foundation and the construction time is significantly reduced. What kind of plaster is better to plaster the walls of aerated concrete blocks?

How to plaster aerated concrete walls?

One of the ways to finish walls made of aerated concrete is plastering. For plastering walls from blocks of cement-sand type - this is best option. As for the process of applying the finishing layer, if desired, you can apply it directly to the wall. The same can be done with brick walls. However, some difficulties may arise in doing so.

Brick has not big sizes, That's why seams between bricks serve as a connecting element when applying plaster. In the case of aerated concrete, the situation is somewhat different, because the aerated concrete itself is large. This problem can be solved in several ways. Consider the main ones that are often used in practice.

Walls can be plastered both inside and outside the room. Both types of finishes have some features. When choosing a plaster, it is best to choose the one with the highest adhesion coefficient. This is to ensure the quality of adhesion of materials.

Preparatory work

Before applying a layer of plaster, the walls of aerated concrete are preliminarily prepared, this is necessary in order to ensure adhesion of materials. How is it done and what does this stage of surface finishing include?

First, you need pay attention to the seams between aerated concrete, they need to be well sealed, approximately 4 - 5 mm. The wall is leveled, and all defects that may occur, dust and other trace elements that reduce the quality of adhesion of materials, are cleaned. To clean the surface, you can use sandpaper, which will help to more thoroughly sand the blocks.

How to use the grid when plastering walls?

If you decide to use the third method of surface finishing, then you need to know what is used in this case. galvanized mesh. It is more durable, reliable and does not rust. As for the size of the grid cells, you should pay attention to the one in which the cells are small. After the preparatory work you will need to attach the mesh directly to the wall. This must be done with ordinary nails. They are driven into the wall first by one third, after which the nail is bent, fixing the mesh.

Particular attention should be paid to the edges of such a section, they usually stick out, before applying the plaster, all edges should be bent, then they will not stick out from under the plaster.

When the mesh is fixed, it is necessary to start applying the first layer of plaster. This is done in a way known as "spray", it is mainly used to fill grid cells with mortar. After it, several more layers of plaster will follow. This will necessarily be a primer layer, which must be kneaded by adding slag sand to the solution. The final layer will be the final layer, to prepare the solution for it, you must use fine sand.

All layers of plaster can be apply when the previous layer is not completely dry. This will reduce the time without reducing the strength and quality of the finishing layer.

Mortar for plastering walls can be purchased already in ready-made, it is sold in dry condition. To prepare the mixture, you just need to add water. But, it is also possible to prepare cement- sand mortar on one's own. In this case do not save on the quality of the cement itself, since the water-repellent ability of the plaster will suffer as a result. When plastering walls, a lot of tasks and requirements are solved, such as thermal insulation characteristics of the surface, water resistance, sound insulation, and so on.

The construction of floors from aerated concrete material has several advantages. First of all, it is light weight and low coefficient of thermal conductivity. In order to avoid destruction, a wall made of this material must be finished. Due to its porous structure, indoor plastering of aerated concrete walls is carried out with the nuances associated with maintaining the microclimate inside the house. Therefore, not every finishing material can be used.

Material Properties

Before proceeding with the choice of plaster composition for walls made of gas blocks, it is advisable to understand what properties they have and why not every type of finishing material is suitable. Aerated concrete is an energy-efficient material for various types of construction. According to its parameters, it belongs to the group of cellular concrete, since its larger volume is made up of gas bubbles. The advantages of such building material are:

thermal insulation properties;
low specific gravity;
good sound insulation;
possessing fire resistance of I and II degrees;
ease of processing.

Working with aerated concrete is easy and fast. From it you can build a house on your own, without resorting to the services of construction organizations. About a day, a person can lay up to three cubic meters of gas blocks. The composition of the material includes cement, lime, sand, aluminum paste and water. All substances are mixed in a given proportion, the value of which determines the strength of the resulting block. The reaction between aluminum paste and lime produces hydrogen. It contributes to the appearance of a huge number of pores, reaching a maximum size of two millimeters.

The mixed mass with the ongoing reaction is sent to the molds, where it solidifies. After the frozen form is cut into standard blocks and polished. Despite all its merits, aerated concrete blocks are hygroscopic. And this means that not every finishing mixture is suitable for plastering walls from gas blocks. Due to the high porous structure, the internal plaster of aerated concrete walls is simply necessary to protect it from the effects of environmental humidity. Moisture quickly penetrates into the thickness of unprotected gas blocks through the structure of air bubbles, causing their destruction.

Features of use

The construction technology using aerated concrete is not particularly different from the construction of walls from another type of block materials. The difference lies only in the binder composition for the blocks. The connecting seams are made with the minimum possible thickness to prevent the formation of cold bridges. Therefore, when building walls, glue is used that allows you to make a seam with a thickness of not more than three millimeters. Thus, the features of the use of aerated concrete are as follows:

Mortars used for plastering interior and exterior surfaces differ in their characteristics due to different conditions environmental impact. For outdoor use, they must not only be resistant to moisture, but also not change their parameters with temperature fluctuations.

Solution Requirements

It is necessary to select plaster with great responsibility. The final result will depend on this choice in the end. When choosing how to plaster walls from aerated concrete indoors, first of all, environmental conditions and the requirements for the resulting wall are taken into account. When choosing a building mix for plastering, pay attention to the following parameters:

When choosing a mixture, it is necessary to pay attention to its labeling. It should indicate the main characteristics and the purpose is written - for cellular concrete. Usually the price of such plaster is slightly higher than that of ordinary mixtures.

Types of plaster mixes

In specialized outlets you can find products from various manufacturers. There are several most commonly used types of plaster. Depending on the composition of the mixture, they are: lime-cement, gypsum, silicate and silicone.

Plasters based on cement-sand mortar are not considered very suitable. Although of all other types are the cheapest. Such a solution has a low vapor permeability coefficient and quickly gives up its moisture to aerated concrete. Because of this, it breaks technological process solidification and adhesion of the solution. Therefore, this type of mixture as internal plaster for aerated concrete is almost never used.

In the case of plastering with just such a mixture, lime is added to increase vapor permeability, and after drying, a layer of gypsum finishing putty is applied on top of the plaster. To improve adhesion, a primer is used that provides increased adhesion of materials, which eliminates the difference in price compared to specialized mixtures. It should be borne in mind that a decrease in vapor permeability leads to the formation of mold.

The use of glue used to bond the blocks together is undesirable. The adhesive mixture is developed exclusively for application in a thin layer. It will not be possible to make an even protective coating from it, and the cost of such material is quite high.

Gypsum plaster is considered the most popular for plastering gas silicate blocks. Its advantages include:

optimal drying time;
does not shrink;
with sufficient skill, the applied layer forms a perfectly flat surface;
the quality of the plaster allows not to apply the finish coat.

In addition, gypsum also has disadvantages: mediocre vapor permeability, the likelihood of various spots on the surface, the process of mixing the solution requires a large number water.

To work with gas silicate blocks, it is recommended to use a special facade plaster. It is she who provides the desired indicator of vapor permeability and good adhesion to the base. Due to the low absorption coefficient, there is no need to apply additional layers of plaster. This type of mixture quickly gains strength, it usually already contains fibers for reinforcement. The main downside is the price.

When choosing the type of plaster, financial possibilities are also evaluated. The cheapest way would be to use a lime-cement composition, but at the same time the quality of the finish will be the lowest. Silicate compounds are optimal in terms of price-quality ratio, but require additional puttying. Mixtures based on silicone additives are ideally combined with the characteristics of aerated concrete blocks, but they are also the most expensive.

Finishing technology

Regardless of the mixture chosen, before you start plastering aerated concrete indoors, you will need to prepare both the tools and the surface. At the first stage, the surface of the overlap is inspected for the presence of glue sagging and irregularities in the seams. Defects in the seams are sealed with putty, and the influxes are cleaned off with a spatula, planer or grater.

The next step is to apply a primer. Before applying it, dust is removed from the surface, for example, by wiping with a damp cloth. After drying, the primer is already applied. It is distributed evenly over the entire surface. The easiest way to do this is with a roller or a wide brush. The choice of primer type depends on the type of room and the plaster mixture planned for use. So, for a gypsum mortar, a universal primer is suitable, and for a sand-cement mortar, a primer deep penetration.

With insufficient skill, as well as for the convenience of plastering, beacons are installed. Their height limits the thickness of the applied solution. They are located on the wall vertically to the floor. The distance between them is chosen less than three to four centimeters of the length of the rule, and the evenness of the installation is determined using a level.

Application technique

As soon as the preparatory stage is completed, proceed to the direct application of a layer of plaster. To do this, using the directions of the instructions shown on the bag with the mixture, a solution is prepared. The standard ratio is 1 kg of plaster per 0.5 liters of water. It should be noted that with an excess of water, the solution will spread, and with a shortage, it will crack.

After kneading to a creamy state, the solution is left for five minutes and mixed again. The mixture should be prepared in small portions, even if the surface to be plastered is large. This is due to the "life" of the material, which averages 40-50 minutes, after which its properties deteriorate.

A trowel or spatula is used to spread the solution. Throwing starts from the bottom up in such a way that the layer of plaster overlaps the height of the lighthouses. Then, along the lighthouses, making translational movements, they carry out the rule as if on rails, removing the excess.

As soon as all the work is completed and the plaster hardens, the beacons are removed. The voids formed after their removal are filled with putty. The entire wall is inspected for defects, if necessary, puttied with a spatula.

On the last step performed finishing. To do this, if necessary, grouting and sanding is performed.

Required Tools

When performing plastering work without the use of special tools, it will not be possible to achieve an acceptable quality of finish. For work, you will need to use both manual and electric type tool. But at the same time there is a necessary minimum, without which you can not do. It includes:

container for kneading;
putty knife;
trowel;
level.

Of course, even with a high level of craftsmanship, it will be impossible to achieve evenness and smoothness of the surface without beacons. In addition to the minimum tool, you will need to have a rule, a trowel, a grater, an angled spatula, a drill with a whisk for kneading.

Plastering of aerated concrete surfaces is a necessary measure due to the fact that the porous structure of the material allows moisture to pass through well, and this is unacceptable for the durability of any residential building. Aerated concrete bricks are highly hygroscopic. Therefore, facade plaster for aerated concrete is applied without fail, preferably in two layers, and with preliminary protection of the walls with a primer and antiseptics.

Any atmospheric precipitation is the risk of wetting the walls of gas blocks, which, after drying, can begin to collapse, becoming covered with microcracks inside and outside the house. And this risk increases markedly in winter time, because the water in aerated concrete, when frozen, will expand and burst the building material, violating its monolithic structure.

Before plastering the facade and side walls of the house, especially in winter, the outer surface must be protected from moisture with a polyethylene film. After obligatory plastering, any decorative material for the exterior cladding of the facade can be attached to the surface finished with mortar.

Purpose of finishing outside:

Increasing the heat and noise insulation of the building and premises;
Minimization of the probability of wetting the walls with precipitation;
Protection of external surfaces from contrasting outdoor temperatures;
decorative feature.

The application of plaster is the most common method of finishing facades and walls made of aerated concrete due to its relative cheapness and ease of execution. But even such a simple process requires study, so a small overview of the characteristics of the plaster compositions used in construction for outdoor work and the methods of plastering aerated concrete surfaces will be useful.

Three types of practical and cheap building materials for wall decoration are common, therefore, how to plaster aerated concrete should be decided after studying all the options:

Cement-sand mortar

This is the most common internal plaster mixture for builders, but it is not recommended to use it for plastering gas blocks from the outside, since the gas brick does not hold cement well. And, if a primer or fiberglass mesh can be used on the walls inside the house to hold the plaster cement-sand mortar, then these methods are not suitable for working outside due to the constant exposure to temperatures and precipitation. It is undesirable to protect gas blocks with a cement-sand mortar, since gas blocks immediately absorb moisture from the mixture. The reasons for the ban are as follows:
1. The cement-sand mixture has a lower vapor permeability coefficient than aerated concrete. And the most important rule of the plasterer is to use a material whose vapor permeability coefficient is the same as this indicator or greater than that of aerated concrete;
2. Expanded polystyrene or polystyrene is not recommended to insulate the house for the same reason.
The plaster applied on aerated concrete on cement contains a lot of water, since it is kneaded on it. Aerated concrete is initially produced with a high moisture absorption coefficient, so moisture from the solution will quickly get inside the wall, leveling the adhesion, layer quality and strength of aerated concrete blocks, because the main condition for the strength of concrete is slow setting and hardening;
Cement-sand mortar has low adhesion, that is, adhesion. Therefore, for plastering internal walls, lime can be added to the mortar in proportions of 1:10 (lime - cement);
Cement mortar must be closed finishing layer plaster, as the starting layer will be rough.

Construction adhesive mixture

Construction adhesive is a very expensive solution, and it is impractical and uneconomical to apply it in a large layer instead of plaster;
When plastering aerated concrete blocks with a building adhesive mortar, the vapor permeability of aerated concrete will decrease, since the glue does not pass air well. As a result of clogging of the pores in the blocks, the material may begin to crack, mold may appear in poorly dried places, local peeling of the adhesive plaster is possible.

Gypsum for aerated concrete

The positive aspects of plastering with gypsum mortar:

Gypsum plaster mixture quickly sets and dries;
Gypsum mortar does not shrink;
Even a thin plaster surface will be smooth;
For such plaster, a finishing decorative layer is not needed.

Disadvantages:

The vapor permeability coefficient leaves much to be desired;
Large water consumption;
Any atmospheric precipitation moistens gypsum plaster to the entire depth of the layer;
Due to too good adhesion, colored spots may appear on the surface due to the penetration of mineral dyes in the composition of aerated concrete into the gypsum layer.

Gypsum or alabaster is considered the most effective composition for plastering aerated concrete surfaces outside and inside the house. This mixture for facade finishing works has a vapor permeability coefficient equal to that of aerated concrete, excellent adhesion, attractive appearance.

What kind of plaster is better to plaster aerated concrete walls?

Exist special blends for work on aerated concrete. It is preferable to use mixtures with the following properties:

High or medium vapor permeability;
Not more than 200 ml of water per 1 kg of the mixture for its mixing;
The minimum and maximum thickness of the plaster layer (the greater the difference, the better);
Index of adhesion with the main surface - ≥ 0.5 MPa;
Resistance to low temperatures;
Crack resistance;
Long working solution life.

Conditions for plastering aerated concrete surfaces

Holding plastering works in the warm season, it suggests the rainy season, but the wetting of aerated concrete blocks is not as critical as the freezing of moisture inside them. Therefore, it is better to protect the aerated concrete dwelling with moisture-proof films at any time of the year, since the walls may simply not have time to dry in the fall before frost.

The newly erected walls of the house must dry out before they are plastered, therefore both construction and plastering on aerated concrete should be carried out in the summer. Due to the fact that the first row of gas bricks is usually laid on a cement-sand mortar, the drying time of the walls increases, and this circumstance must be taken into account when calculating technological processes.

Applying two or three layers of primer to aerated concrete will significantly reduce its water absorption. The practice of building private housing has shown that the best time for the construction of aerated concrete walls of the building - the season when the temperature at night does not fall below 0 ° C.

There are three options for finishing aerated concrete surfaces, taking into account the order of finishing work:

First held exterior finish. Private developers mistakenly think that first of all it is necessary to protect the house from the outside so that the walls do not get wet from rain and snow. But even wet in the fall, but primed aerated concrete in the spring will quickly dry at positive temperatures. With walls covered with plaster, moisture in winter will only evaporate inside the housing, which will not only extend the drying time of the walls, but also affect the occurrence of cracks on the internal walls of the house;
First held interior decoration. With such an organization of the process, the moisture accumulated in aerated concrete has only an outlet to the outside, and the possibility of cracks will be minimal. Therefore, this finish option is considered the most correct;
Exterior and interior decoration is carried out simultaneously. This option is the worst of all three. Moisture in gas blocks is clogged, and its slow evaporation will lead to cracks, mold, and peeling of the plaster layer.

Internal plastering technology

Before plastering the walls, they must be leveled with a special planer, grinder or grater on aerated concrete. Leveling will help save on the thickness of the plaster layer - if you apply too thick a layer, the plaster may begin to crack or even peel off.

Sanded walls should be primed, but it is not recommended to dilute the primer with water. Then metal beacons are attached to the walls - 2-3-meter perforated ribbed corners that determine the thickness of the plaster layer. The corners are attached to plaster or alabaster, the distance between them is determined by the width of the rule or the widest spatula. The verticality of the fastening is checked by level.

On the walls for aerated concrete, the plaster is applied from the bottom up, and leveled with the rule. Voids and irregularities are filled with mortar using a smaller spatula. After an hour and a half, when the first layer of the solution has set a little, it is moistened with a spray bottle, and leveled with a wide spatula (rubbed). It is desirable to remove lighthouses before this operation, as they can serve as the point of occurrence of "cold bridges". Internal corners are aligned and reinforced with the same beacons, the outer corners are reinforced with a metal perforated corner without ribs, and a fiberglass mesh. After the last layer has completely dried, the wall must be rubbed.

If the interior walls are to be painted, it is recommended to use a paint with good vapor permeability, for example, acrylic, water-based or PVA-based paints, as well as those based on organic solvents.

How to plaster aerated concrete inside the house updated: January 23, 2017 by: Artyom

One of the popular wall materials used for the construction of private houses is aerated concrete. But despite their fame, very often at the stage of finishing an already built house, fatal errors, because of which the natural microclimate of the aerated concrete house is disturbed. And before proceeding to a detailed description of the process of processing the facade, you need to understand why such misconceptions are born, how to avoid them, and what kind of facade plaster for aerated concrete should be.

A little about aerated concrete

To understand the issues of finishing, let's move away from this topic a bit in order to understand how important it is to do everything right and what affects the cladding technology. To do this, you need to plunge into the technology of block production. And if we briefly describe its description, then special additives are introduced into the finished cement-sand mortar, the result of the reaction of which is the formation of a porous structure. If we consider in more detail the body of gas silicate concrete, we can see not only microvoids, but also many tubules that dot them, forming an “open” cellular structure, which has a mass positive properties, such as:

high heat capacity. It is provided not only by the porous body of the blocks, but also by their precise geometry, which allows the use of a minimal butt joint from a special adhesive composition that does not allow the formation of "bridges" of cold;
noise isolation;
not susceptibility to various fungal formations;
The "open" structure of the concrete creates a unique atmosphere inside the premises - coolness will remain in summer, and in cold period warmly. But if this natural vapor permeability system is violated, for example, by illiterate plastering of aerated concrete walls, then the house will be stuffy, and condensation will begin to accumulate on the walls, which will lead to mold.

But the cellular structure of aerated concrete blocks also has certain disadvantages:

a high degree of water absorption leads to the rapid destruction of the walls without the possibility of recovery. Therefore, special attention is paid to waterproofing;
the structure, consisting of open pores, is very well ventilated, which makes the house quite cold, even despite a good heating system;
the heterogeneity of the body of blocks, even of the highest density, makes them susceptible to mechanical stress, which are imprinted in the form of large chips and potholes.

But is it necessary to plaster aerated concrete blocks or is it necessary to install a more solid cladding? Of course, the ventilated facade system is perfect option for decorative wall protection, but if you choose the best way to plaster aerated concrete outside and follow the technology, then this method of finishing will be no less effective.

When is the best time to plaster gas silicate walls

Aerated concrete belongs to the family of cellular concrete, so it has some of its general properties, namely shrinkage. This phenomenon is inevitable, and if finishing is done earlier than six months later, then its cracking is inevitable.

But as we remember, aerated concrete does not like water, therefore, after the walls are erected, rhinestones need to be treated with a deep penetration primer, which reduces water absorption. For reinsurance, you can cover the walls with polyethylene.

The rest of the plastering is best done in the summer, but if the planned finishing falls on the colder period of the year, then it is allowed to be carried out when the temperature at night does not fall below 0 0 C.

The quality of the erected structure of aerated concrete directly depends on the sequence of production of finishing outside the premises and inside. Consider possible ways analyzing their advantages and disadvantages.

Method 1 - parallel plastering inside and outside the house

The production of such a finish is very convenient from a technical point of view, and saves a lot of time. But if we consider this method from the other side, then it is less preferable, since the quality is lost and the characteristics of a newly built house suffer.

Any technology for plastering walls made of aerated concrete implies significant evaporation of moisture. Of course, most of it will be weathered with the help of natural and artificial ventilation, but the bulk of the moisture will fall on the walls. Simultaneously carried out plaster from the outside will clog it for a certain time, which is undesirable.

Method 2 - when the exterior finish is carried out first

It is more logical to initially finish the walls of aerated concrete from the outside in order to prevent their destruction under the influence of atmospheric phenomena. But this is not entirely true, if this is done, then the vapors will be directed inwards, which is highly undesirable.

But even overwintered primed walls will easily give up moisture and all vapors in the spring, without destroying the structure. But if a house is being built near a body of water, then priorities change, and under such circumstances, you first need to protect the walls from the street from exposure to abundant moisture.

Method 3 - when interior decoration is carried out first

Of the proposed options, this is the best, because the volume of moisture formed during the finishing will freely come out through the unblocked pores of aerated concrete. After the plaster is completely dry, you can safely proceed to the cladding of the facade.

Treating the walls with a deep primer with this method of finishing will not interfere with the removal of excess moisture.

What mixture to prefer as facade plaster

The building materials market is replete with a huge range of plaster mixtures intended directly for the processing of aerated concrete. If you believe the manufacturers, then they are all the best in their field. But this is far from true. The characteristics of the main groups of plaster compositions summarized in the table will help you decide.

Type of plaster	Advantages	disadvantages
Silicone blends based on organosilicon polymers	resistance to water absorption; does not deteriorate under the influence of precipitation; high level of vapor permeability; easy to apply	high price
Silicate plaster based on liquid adhesive glass	hydrophobicity; low water absorption	unaesthetic appearance after dust settling; limited choice of colors
acrylic blend	high strength; good decorative qualities	flammability; low vapor permeability. But this can be corrected by using enhanced protection against moisture and organizing the ventilation system of the room with power.
Mineral plaster: lime-sand; cement-sand	resistance to temperature extremes; good adhesion; resistance to cracking; vapor permeability; low cost	does not have high decorative qualities

All vapor-permeable plaster, except for mineral, is available as a ready-mix. In this regard, studying the characteristics various kinds pay attention to the setting time. The longer it is, the easier it will be for beginners to apply the mixture.

But still, the preparation of ordinary cement plaster composition much more profitable from an economic point of view. Therefore, all inexperienced builders are tormented by the question: “is it possible to plaster aerated concrete with cement mortar?”. The answer is unequivocally no, for the following reasons:

low adhesion with a gas silicate surface;
high humidity, which is detrimental to such cellular walls;
low coefficient of vapor permeability, which will not allow moisture to escape.

Some craftsmen even contrive to mix concrete with stucco for profit. But instead they get a lot of problems and the need for large funds to correct the consequences.

Self-finishing the facade with plaster

There is nothing clever about how to plaster aerated concrete as competently as possible. Next is the matter of technology. Plastering can be carried out using several technologies:

thin layer;
thick layer.

There is no particular difference in them, the choice is yours, depending on which way it will be more convenient to apply the plaster.

Training

In both cases, before finishing, you need to prepare the base.

Stage 1. The walls are cleaned with a stiff brush from dirt.

Stage 2. Defects in masonry joints are eliminated with an adhesive composition.

Stage 3. If there are potholes in the blocks, they also need to be “patched” with the same masonry adhesive or mounting foam.

Stage 4. Beacons are mounted on nails - a profile along which alignment will occur.

Stage 5. The base of the walls is primed with a hydrophobic composition with a surface 2–3 mm thick.

Stage 6. After it dries, a composition for a 5 mm reinforced cloth is applied.

Stage 7. A reinforcing mesh (fiberglass or metal) is fixed on the walls with an overlap of 5 cm. It is better to do this with a solution than with self-tapping screws. Since in the first case, the grid will become one with the wall and, accordingly, will “sit down” together with aerated concrete, preventing the appearance of small cracks in the plaster layer. By the same principle, they are installed and fixed plastic corners. Only after the reinforcing plaster has dried can it be continued.

Thick plaster surface

When carrying out plastering using this technology, it is meant to apply one layer sufficient to perfectly level the wall - at least 10 mm.

Stage 1. Dilute the plaster mixture in a small amount.

Stage 2. The composition is thrown onto the walls.

Stage 3. The plaster is aligned with the beacons by the rule.

Stage 4. After plastering the entire surface of the walls, wait until it is completely dry and only after that you can paint as desired.

Thin-layer plaster surface

Plastering walls using multi-layer technology is also not difficult and is more suitable for beginners.

Stage 1. The first layer is applied in 3-4 mm on aerated concrete. Only after it has completely dried can you continue further.

Stage 2. The applied plaster is considered to be leveling, so special attention should be paid to evenness. Again, we are waiting for complete drying - about 3-4 days.

Stage 3. The final step is to cover the finish surface, which can then be rubbed down if necessary.

Stage 4. After the previous application has dried, the walls can be painted.

To increase the life of the plaster, it is necessary to treat it with a water-repellent solution. It will extend the life of the plastered surface by almost two times. Especially the use of such compounds is relevant in areas with high humidity.

As you can see, plastering the walls yourself is not so difficult. In the first 10 m 2 you will develop your application style, after which the process will go much faster.

Renovation inside the premises is carried out in several stages. When conducting repair work it is important not to forget about plastering concrete walls from the inside. Plaster for aerated concrete plays an important role, even if we are talking on carrying out work in panel buildings of modern planning. As a rule, concrete slabs have an uneven surface, and this defect cannot be corrected with putty alone. Block coverage is necessary for a number of reasons. These include the smoothness and cleanliness of the wall surface.

Ways

For plastering the internal surfaces of a building, during the construction of which aerated concrete was used, two methods are used. The first method is that plastering on aerated concrete is carried out in such a way as to achieve vapor permeability in concrete walls due to the unique qualities of the material. Builders do not recommend using mortar and cement and sand for finishing blocks indoors. Aerated concrete blocks instantly absorb liquid, after which they become covered with cracks. It will not be easy to mask the irregularities that have appeared even after priming the vapor-permeable wall.

Some specialists are engaged in plastering gas blocks using a different method - vapor barrier. At the same time, the indoor climate will be the same as in reinforced concrete buildings. The only difference is that such plastering will be more reliable.

Promotes vapor permeability of the walls

The components contained in aerated concrete contribute to the vapor permeability of the building material. However, this factor requires the selection of a certain composition of mixtures for repair and finishing work on the walls of the building. To do this, it is necessary to perform plastering in such a way that the inner wall is vapor-permeable or, on the contrary, vapor-proof. In a house with such a wall, the microclimate will self-regulate. In addition, they will not be in the wall.

vapor barrier

To process inner wall and increase the vapor barrier at least ten times, experts apply a solution, the thickness of which should reach two and a half centimeters. The plaster contains cement and other ingredients. Sometimes, for this purpose, workers put a film of polyethylene under a layer of plaster. But experienced builders are not advised to carry out such work, since the film can peel off plasters and walls due to condensation.

What materials and tools are used?

Everything depends primarily on the task that customers and specialists have set for themselves. For its implementation, building materials are selected that can properly interact with aerated concrete and have the property of vapor permeability. Professionals recommend treating the inner surfaces of the walls of the blocks with a mixture of gypsum, sand and lime. Builders also use tools that include chalk or marble.

For finishing work, specialists use tools for plastering. The mixture is prepared in containers of the appropriate size. The solution is mixed with a mixer either. Thin-layer plaster on aerated concrete is applied to the blocks with a trowel or trowel. Rubbing surfaces is carried out using a grater. A half-ter is used to remove excess mixture. The surface of the blocks inside the walls is leveled with beacons. The aerated concrete plaster is pulled together by the rule between the guides. Builders determine the quality of the work carried out with a rail.