Plastering walls made of gas silicate blocks from the outside. Instructions for plastering gas silicate blocks. Tools required for work

Treating walls with plaster: advantages and disadvantages compared to other types of finishing work
Construction and repair technologies are changing, new materials are appearing, but plaster remains a popular method of wall finishing that has stood the test of time. Reliability, thoroughness and durability of the result obtained are strong arguments in favor of plastering.

Drywall, which gained popularity due to its ease of installation and became an excellent option for perfectly leveling walls, could not completely displace its “fundamental” competitor. Although communications are conveniently hidden under sheets of plasterboard and a thermal insulation layer can be placed - these are undoubted advantages, but they do not withstand loads, reduce the area of the room and require finishing- these are the disadvantages.

The process of plastering aerated concrete inside a house, like any other room, is labor-intensive, it takes more money and time, you have to go through a rather “dirty” period, but as a result, the walls acquire a high-quality coating that can last for several decades. Of course, it also requires decorative finishing, but unlike a plasterboard base, its strength will withstand almost any load - shelves and canopies can be mounted on these walls and any design and renovation experiments can be implemented.

Plaster can be applied to any surface, with the exception of very uneven walls, which require a thick layer to level concrete mixture. In this case, it is easier and more profitable to use plasterboard finishing.

Selection of material for plastering aerated concrete walls

Aerated concrete ( gas silicate blocks) is a relatively new building material, but it has gained incredible popularity and the title of “revolutionary” on the market. Thanks to its cellular structure, it provides good thermal insulation combined with excellent air and moisture conductivity.
Its excellent air and vapor conductivity characteristics place special demands on the technology, quality of finishing and materials used.

Firstly, the finishing material should not drown out these valuable qualities, completely blocking the pores and depriving the house of the ability to “breathe”.

Secondly, porous aerated concrete, while providing good air exchange, can quickly “dry out” a plastered wall and cause cracks to appear on it.

Therefore, the choice of material for plastering aerated concrete surfaces is approached with special care. It is necessary to use specially formulated plaster mixtures marked “For aerated concrete”. They have added components that bring the properties of the plaster as close as possible to the properties cellular concrete and improving its adhesion, adhesive and vapor-permeable characteristics.
In addition, the solution prepared from these mixtures acquires elasticity and durability and can be applied to the walls in a thin layer.

Sequence of work

For the same reasons, the sequence of work has its own specifics: first, the interior walls are plastered, they wait until they are completely dry, and only then can the exterior finishing work begin. The moisture must completely escape from the inside to the outside, and not vice versa.

The plastering process consists of three stages:

preparation of the base;
applying the base layer;
applying the finishing coat.

Preparing the base. Gas silicate walls have a smooth, uniform surface with very thin seams, since glue, rather than concrete, is used for masonry. A smooth surface necessarily requires the application of a primer layer, which strengthens the adhesion of the plaster and the wall and reduces the moisture-absorbing properties of aerated concrete so that drying occurs evenly.

Applying the base layer. After the primer has dried, the dry mixture is diluted with water in accordance with the manufacturer’s instructions and a base reinforcing layer of plaster is applied to the wall using a notched comb trowel. It is reinforced with alkali-resistant fiberglass mesh: it is simply pressed with a trowel into the upper third of the layer and smoothed. The mesh sheets are embedded in the plaster with a one-on-one overlap of 8-10 mm. They prevent the occurrence of deformations, shrinkage and cracks.

Sufficient thickness of the base layer is about 4 mm - special additives in the mixture for aerated concrete make it possible to obtain a durable coating with minimum thickness. The plaster takes a long time to dry - you have to put up with this. As a rule, 1 mm is given 1 day to dry, i.e. The entire layer will dry for about 4 days.

Applying the finishing coat. It is recommended to prime the base reinforcing layer before applying the topcoat. The decorative layer is applied with a metal float. Its thickness depends on the size of the fractions in the mixture - solid particles that give the plaster a relief pattern. For example, if the size of the fractions is 2 mm, then the thickness of the decorative layer should not be more than 2 mm.

Having leveled the plaster and waited a little until it “sets”, they “texture” it with a plastic trowel - giving it relief. Some topcoats do not require further painting because... already contain color pigments.

It would be useful to know that finishing work in a house made of aerated silicate brick is not recommended to begin immediately after the construction of the frame. Humidity "fresh" aerated concrete block from the factory is high - about 30%, it is advisable to wait about six months for it to dry to 15%. Aerated concrete walls do not require special insulation, so the house can be used at first without finishing.

Finishing begins with plastering the aerated concrete inside the house, i.e. from the internal walls, and finish with the external ones, and in no case vice versa. Drying should take place through the outer wall.

Work is carried out in compliance with temperature regime within the range from +8 to +30 C. Optimally – at 15-20 C.

If you follow the recommendations, the right technology works and selection of appropriate materials, plastered aerated concrete walls will last for decades, providing comfortable air exchange, absence of dampness and cracks on the surface.

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

Methods

For plastering the internal surfaces of a building in 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 cement and sand mortar for finishing blocks indoors. Aerated concrete blocks instantly absorb liquid, after which they become covered with cracks. It will not be easy to disguise the emerging irregularities even after priming the vapor-permeable wall.

Some specialists plaster aerated concrete blocks using another method - vapor barrier. In this case, the microclimate in the room will be the same as in reinforced concrete buildings. The only difference is that such plastering will be more reliable.

Promotes vapor permeability of walls

The components contained in aerated concrete promote vapor permeability building material. However, this factor requires the selection of a certain composition of mixtures for carrying out repair and finishing work on the walls of the building. To do this, it is necessary to carry out plastering in such a way that the inner wall is vapor permeable or, on the contrary, vapor barrier. In a house with such a wall, the microclimate will self-regulate. In addition, there will be no .

Vapor barrier

To process interior 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. Plaster contains cement and other ingredients. Sometimes, for this purpose, workers place a polyethylene film under a layer of plaster. But experienced builders do not recommend carrying out such work, since the film may peel off from the 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. To implement it, building materials are selected that can interact correctly with aerated concrete and have the property of vapor permeability. Professionals recommend treating the internal surfaces of walls made of blocks with a mixture of gypsum, sand and lime. Builders also use products that contain chalk or marble.

For finishing work, specialists use plastering tools. The mixture is prepared in a container of appropriate size. The solution is mixed using a mixer or. Thin-layer plaster on aerated concrete is applied to the blocks with a trowel or trowel. Grinding of surfaces is carried out using a grater. The polisher 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 between the guides. Builders determine the quality of the work performed using a lath.

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

Usage aerated concrete blocks as a building material - practically perfect option for low-rise housing. Private houses built from them have such advantages as low weight (and, therefore, do not require the construction of very strong foundations), low thermal conductivity and affordable price. At the same time, an increase in the humidity of the blocks leads to a deterioration in its heat-saving characteristics and to heavier structures. To protect the walls, plastering of aerated concrete walls is required - sometimes external, but most often internal.

Finishing features

When performing internal plastering of aerated concrete, it is worth taking into account the characteristics of this material and the differences from more traditional brick, concrete and stone. First of all, this concerns the cellular structure of the blocks, which were initially considered insulation, and only then began to be used to build the walls themselves. Due to the open structure, which is the result of adding a special gas-forming 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 work on the facade of the building. Changing the order and performing the external one first, and only then interior decoration, leads to too high humidity in the room. Outgoing (especially when severe frost) steam condenses in the walls at the border between aerated concrete and finishing. The moisture created by this can lead to cracks in the plaster and pieces of it falling off. That is why interior finishing work is carried out first.

Selection of method and material

When performing finishing work, plastering walls made of aerated concrete is carried out 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, involves complete vapor barrier. The benefits of maintaining vapor permeability are to create optimal microclimate, and the option with wall insulation is intact exterior finishing, which is not affected by steam escaping from 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 compared to aerated concrete is considered. In cement this characteristic is much lower, which does not allow preserving normal conditions inside the building. For the same reason, the answer to the question whether it is possible to plaster polystyrene foam or polystyrene foam will be negative.

Besides, cement-sand mortar It has high humidity due to the significant amount of water required for its preparation. Aerated concrete structures, which have a high water absorption rate, absorb liquid from the finishing material. The quality of the mortar, which requires uniform drying to gain strength, is reduced, as is its ability to adhere to the 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 the inside of aerated concrete. Despite the fact that it is designed taking into account the characteristics of the material, it is advisable to apply the adhesive in a thin layer, which is not suitable for protection against cracks. As soon as the vapor permeability of the block is broken, on the surface thin layer plaster for aerated concrete from the adhesive mixture will appear immediately;

cracks;
marks from seams;
and even mold.

Vapor-permeable finish

When choosing the option of finishing walls made of aerated concrete indoors while maintaining the natural vapor permeability of the material, use plaster mixtures based on gypsum and gypsum putty. Thanks to the slaked lime and perlite sand they contain, 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 used as interior plaster walls made of aerated concrete such mixtures, which contain a high content of such natural materials With high degree vapor permeability:

chalk;
marble;
dolomite;
limestone.

Their vapor permeability rates are higher compared to not only internal, but even external plaster, and the dried solution is easily rubbed down, acquiring perfect whiteness. The resulting coating has excellent durability and allows for 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.

Finishing with vapor barrier

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 method of fixing it to the walls is to lay it under one of the finishing layers. However, the speed and ease of installation do not matter if condensation forms on structures finished in this way and the plaster swells. More suitable option in order to plaster aerated concrete inside the house, it will be sand-cement mixture, which does not contain additives in the form of dolomite flour or lime. With its help, vapor permeability is reduced several times, but the possibility of peeling off the plaster after some time increases.

The following will help to further reduce the vapor barrier without affecting the quality of the finish too much:

oil paint used to cover walls final stage works;
applying 3–4 layers of a special composition as aerated concrete primer;
use of adhesives before applying plaster. In this case, you can even do without using putty. Adhesive materials have the same properties and, in fact, replace it.

Features of work

To finish aerated concrete with your own hands, you need to use the same tools that are needed for regular plastering. To prepare a solution of the plaster mixture, you need a special container - such as plastic tank or a bucket made of the same material. Their size should be sufficient to place all the ingredients for plaster inside.

Water is added to the dry mixture that is poured into the tank. The mixture is stirred to the desired state using a drill with an attachment or construction mixer. As a rule, the proportions of material and liquid can be determined by the inscriptions on packages of building materials.

Plaster of aerated concrete walls is applied indoors by “throwing” it with such tools as:

Master OK;
plaster ladle;
trowel.

The surface is rubbed with a float. And excess mortar can be removed from the wall with a scourer. You need to level the wall with the help of beacons, and tighten plaster mortar- the rule. Another tool that you can’t do without when performing work is a lath that extends from the floor to the ceiling. With its help, defects on the walls are checked - deviations of no more than 6–7 mm in size are considered acceptable.

Plastering process

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

Solutions for aerated concrete blocks, which require maintaining vapor permeability, also
are capable of transmitting steam, distinguished not only by high water-repellent properties, but also by the ability to strengthen enclosing structures. The primer must be applied not in one layer, but in several. In this case, it is necessary to take into account that the new application is carried out only on top of the completely dried old one.

Fastening the mesh to reinforce the blocks. Because of big size Each aerated concrete product has a small adhesion to finishing materials. And to increase strength, reinforcement is used with a material that contains alkali-resistant fiber. Can be used for aerated concrete mesh "chain-link" with small size cells. To fasten it, the use of 120 mm nails is required, which are driven well 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 selecting materials), the adhesion of the finishing layers to aerated concrete is ensured by grooves intersecting each other, made by any suitable tools- for example, with a hacksaw.
Applying the first layer of material (pre-selected, the better to plaster aerated concrete) onto the mesh. In this case, the “spraying” technology is used, which ensures complete filling of the aerated concrete cells, and leveling of the first layer is not carried out, which improves adhesion to the next layer of plaster.

When applying a priming solution over rough aerated concrete plaster, it is necessary to maintain the layer thickness at 4–5 mm. It is recommended to add slag sand to the primer. When applying the final plaster layer, it is advisable to use a building material that contains fine sand, which increases the smoothness of the blocks.

Plastering walls made of gas silicate blocks contributes to significant strengthening performance characteristics bases made of porous concrete, which is exposed to external factors. The material is in demand in the interior decoration of buildings made of aerated concrete, and is also successfully used facade plaster – effective option exterior design of the house.

When aerated concrete walls are constructed, the following types are used: plaster finishing, How:

cement-sand mortar;
gypsum mixture;
facade plaster for gas silicate blocks.

Is it worth using cement-sand mortar?

As professionals note, it is extremely undesirable to plaster aerated concrete with cement mortar for the following reasons:

Cement finishing material has a lower vapor permeability coefficient than aerated concrete. When working with gas silicate walls, finishing mixtures are relevant, the vapor permeability values of which are similar to those of the treated base or slightly exceed them. This is necessary to ensure an optimal microclimate in a house made of aerated concrete.
The cement mass has a higher moisture content, while aerated concrete is different high level moisture absorption. This negatively affects the quality of the cladding, since concrete gains strength only if it dries evenly.
The cement-plaster substance does not have high adhesion and does not adhere well to the gas silicate base due to the large weight of the solution and the presence of impurities in the composition.

Adding lime to classic recipe cement mortar in proportions of 8-10 kg per 100 kg, you can increase the adhesion rate. Suppliers of construction and finishing products offer cement-lime plaster in the form of a dry mixture, for example:

KREPS Extra-light;
Founded by Startwell T 21;
Baumit HandPutz 0.6.

In the photo KREPS Extra-light - cement-lime plaster in the form of a dry mixture

The big disadvantage of plastering with cement-sand mixture is the need to apply a finishing coating in order to improve the decorative effect of the surface.

What are the advantages and disadvantages of gypsum finishing mixture?

Key advantages gypsum plaster based on gas silicate blocks they calculate high speed drying and non-shrinkage of the material. It is noteworthy that when working with this facing mixture there is no need to apply a final coating, since a smooth surface is obtained.

The disadvantages of gypsum cladding include such points as the mediocre vapor permeability of the material and a high level of moisture absorption. In addition, note the likelihood of stains forming on the surface.

Among the popular solutions are the following types of gypsum vapor-permeable highly plastic plaster on gas silicate blocks:

VELVET G-567 will win;
Knauf Rotband;
Bonolit.

Despite some disadvantages, gypsum mortar is considered a good option for cladding gas silicate blocks.

Facade plaster for aerated concrete

good adhesion;
the vapor permeability indicator is identical to that of the gas silicate base;
no need for final cladding.

When deciding which plaster is best for gas silicate blocks, it is worth keeping in mind that the use of a facade plaster mixture can significantly optimize do-it-yourself finishing work.

Characteristics of plaster

There are such types of plaster bases as mineral, silicate, acrylic and silicone.

Mineral-based material belongs to the finishing resources of the democratic segment. In addition, mineral plaster is not difficult to make yourself. Ready solutions contain:

white cement;
lime;
marble chips and other fillers;
special additives that improve functional and decorative qualities products.

Products are presented in limited quantities color scheme, but the problem is easily solved by painting the coating.

Mineral plaster has a high level of vapor permeability and water absorption, and is inert to UV radiation. Sensitivity to pollution and resistance to biological damage is average, and the elasticity index is low.

Silicate plaster on gas silicate blocks is more convenient to apply, although it has average elasticity parameters. The connecting link in the mixture is liquid glass. The vapor permeability of silicate finishing is high, and the level of water absorption is average, all this determines the demand for products for finishing cladding of aerated concrete blocks. Silicate composition Sold ready-made, the cost of the product is slightly more expensive than dry mineral analogues.

The basis of silicone plaster is silicon-organic polymers. This is perhaps the most the best option mixtures for facing aerated concrete, as it is highly elastic and does not crack when the base shrinks. Silicone material is also known for the following advantages:

easy to apply;
has high performance vapor permeability and low level water absorption;
inertness to pollution and biological influences.

Silicone plaster is offered in a wide variety of textures and colors. Ready-to-use products are sold in the expensive segment, this is the only negative in the collection of finishing materials.

Acrylic plaster is relevant for aerated concrete surfaces only if there is enhanced waterproofing of the walls and high-quality ventilation of the room. The basis of the cladding is acrylic resin, the material is highly elastic. At the same time, the level of vapor permeability of the composition is low, as are the moisture absorption rates.

Popular mixtures for plastering walls made of gas silicate slabs

The finishing materials market presents a wide range of special dry mixtures and universal species plasters for walls made of gas silicate:

Baumit Silicone Top – ready mix with a binder base made of silicone resins;
Baumit Silikat Top is a ready-to-use silicate-based plaster composition;
Weber.pas Silikon – ready-to-use plaster based on silicone emulsion;
Atlas DR TYNK - facade plaster for buildings made of aerated concrete and foam concrete blocks;
Ш-36 Decor – composition includes cement base with reinforcing polymer components;
Profit Contact MN – cement-sand base with plasticizers for machine application;
MCKA mix – plaster mixture, which includes polymer modifiers and quartzite;
Dali - composition for cladding gas silicate, foam concrete and polystyrene concrete walls;
Ceresit CN 24 – a special mixture based on a combined binder for leveling and plastering walls;
Ceresit CT 77 is an acrylic ready-mix with a mineral filler.

It should be remembered that key criteria The choice of plaster composition for aerated concrete slabs is the weight of the finish and the type of binder.

What tools will you need for the job?

Plastering on gas silicate blocks is carried out using the following set of tools and devices:

The rule is an indispensable device for pulling mortar along beacons, capable of ensuring ideal surface leveling. Beginners are recommended to choose a not very wide version of the device, 2 meters long;
plastic container for preparing a working solution of the required volume. You can use a bucket, improvised containers in the form of containers or tanks in which it is convenient to breed required amount plaster composition;
electric drill with mixer. Since the volume of work ahead is quite large, it is worth using a special power tool to mix the solution. This allows you to significantly reduce time costs, optimize the speed of work and process efficiency;
a special ladle for throwing the working mixture or a plasterer’s trowel. Depending on your preferences, you can choose convenient option this construction tools, which is available in a wide variety of models;
grater. Used to level the surface of the plaster layer;
poluter. The tool is necessary to remove excess working mixture from the surface.

The last two devices differ only in size.

Recommendations and requirements for the technology of the wall finishing process

Plastering work begins only after all “wet” stages of repair and finishing activities have been completed, when the surfaces both indoors and outdoors are completely dry. The maximum permissible humidity of aerated concrete blocks is 27%. Plastering of the facade is carried out at air temperatures in the range from +5 to +30 °C, with a relative humidity of no more than 80%.

You cannot plaster in strong winds or in hot weather; this can cause the solution to dry out quickly, and, as a result, the finish becomes covered with a web of microcracks and peels off. Working with plaster on a wall in direct sunlight leads to exactly the same result.

Stages of the finishing process

Work on cladding a house from gas silicate slabs begins with the internal planes; this will ensure high-quality evaporation of moisture through the outer surfaces of the walls.

Stages of plastering gas silicate blocks from the inside:

surface preparation: if possible, remove uneven surfaces; before priming, treat the surface with a roller dipped in water. It is worth considering that the choice of primer for gas silicate blocks for plaster depends on the purpose of the room being finished. Thus, when arranging the walls of the bathroom and kitchen, a deep penetration composition is in demand due to the high humidity coefficient of the space. At the same time, in “dry” residential areas, light, inexpensive types of primer are used;
installation of beacons. Using a level, the vertical evenness of the beacons is adjusted, and a rule is used to check the frequency;
applying the first layer of plaster. The work is done from bottom to top along the wall, using the throwing or spraying method;
After the initial coating has dried, several more layers of plaster are applied in stages, depending on the recommendations of the manufacturer of the mixture used.

Finally, the coating is leveled and, if necessary, final finishing is carried out in the form of painting or wallpapering.

Stages exterior finishing:

surface leveling and priming;
applying a thin layer of mortar and laying a reinforcing mesh, on top of which the first plaster coating is applied;
After the initial coating has completely dried, apply a second one. plaster layer, focusing on leveling the surface;
the third layer is applied after the surface has completely dried;
Finally, grouting is carried out.

Knowing the specifics of choosing a material and the sequence of work, it is not difficult to plaster gas silicate blocks with your own hands.

Affordability and high performance characteristics have made aerated concrete one of the most used building materials in the construction of low-rise buildings. After the completion of the immediate construction phase, the question arises final finishing Houses. Plastering gas silicate blocks on the outside is the most common method. This is due to relatively low cost the finishing material itself and the simplicity of the work technology - any home owner who knows how to hold a tool in his hands is able to carry out plastering on his own.

Interior wall decoration in a similar way is also used quite often. However, there are certain nuances of finishing. First of all, this is due to the properties of aerated concrete itself. Let's try to understand in more detail how, when and with what to plaster gas silicate blocks inside the house and carry out external work.

Advantages of gas silicate

First, let's briefly look at the performance characteristics of the building material. Aerated concrete has a number of obvious advantages that explain the popularity of its use. In addition to the already mentioned attractive cost, these include:

Selection of plaster

It is the increased vapor permeability that explains the difference between the technology of gas silicate plaster and similar work on the surface of walls made of other building materials. If you apply a continuous coating to aerated concrete that does not have the appropriate moisture transmittance coefficient, unpleasant consequences are likely to occur as a result:

the plaster will crack and crumble, and this process is possible both outside the house and inside;
inside a closed room the humidity will be constantly increased;
as a consequence of the previous point, fungus and mold will become habitual inhabitants of corners and baseboards;
The pattern of block masonry will clearly appear on the plaster walls, disappearing after the room is ventilated and dried.

To avoid such problems, to carry out plastering works need to use special compounds. The table provides a list of basic requirements for finishing materials for aerated concrete.

Before purchasing a dry mixture, carefully read its characteristics and determine whether it is possible to plaster aerated concrete walls with its help.

Price plaster compositions, which have similar parameters, are slightly higher than those of ordinary plaster based on a mixture of cement and sand. However, due to a thinner layer application, it is possible to avoid a significant increase in the cost of finishing.

With the question “What to plaster with?” figured it out. Now let's move on to a description of how to properly plaster walls made of gas silicate blocks.

Carrying out interior work

Interior decoration always begins with the wall preparation stage. Since one of the advantages of aerated concrete blocks is standard size, preliminary leveling of the surface and removal of protruding excess adhesive composition can be easily done using special grouting meshes or sandpaper. If necessary, you can use a grinding machine.

Exterior finishing

The technology of external plastering is practically no different from the process of internal work described above.

The only difference is the thickness of the coating: if 1-2 layers are enough on the inner surface, then on the outside the thin-layer method involves applying 3 layers, and the thick-layer method - 5-6. The plaster used for exterior work is the same as for interior use.

Each layer of applied plaster is necessarily reinforced with a fiberglass mesh. Naturally, this leads to certain expenses. However, it is better to spend a small amount at the finishing stage than to pay again for repairs after just a few years.

The applied layer must be given time to dry completely, and only then proceed to the formation of the next one. Therefore, it is preferable to carry out work in the warm season: pauses in the production process will be shorter.

After the plaster has completely dried, the surface can be painted. It is recommended to use only special vapor-permeable paints, for example, PASTEL, ATLAS or ARKOL S.

Features of plaster

The main nuances of the work are again related to the vapor permeability of gas silicate. The factory technology for manufacturing blocks provides for the sale of products with an internal humidity of 30%. For exterior finishing, this figure should be no more than 15%. Therefore, it is advisable not to proceed to finishing work immediately, but to let the building “breathe” for some time.

In the future, we first carry out internal plastering. This mandatory rule. If you start with exterior work, the moisture accumulated in the material will not have a way out, and with the onset of cold weather, at best, the plaster will begin to fall off, and at worst, cracks will appear in the walls themselves.

After finishing the work inside, we take a significant break. Ideally, the house should stand without external decoration for at least 1 - 1.5 years. The strength properties of aerated concrete allow it to survive such a long period without deteriorating further performance characteristics. But high quality external plaster, applied to mature blocks, can last at least 15 years.

Another feature that needs to be taken into account when choosing a method of external design of facades is the reinforcement of walls during the construction process. Exterior plaster is used only if the construction technology provided for additional reinforcement every 3-4 rows of wall blocks. If the strengthening of the house was limited to the construction monolithic belts at levels interfloor ceilings and under the Mauerlat, it is recommended to avoid using plaster. In this case, it is better to use siding, clapboard or decorative stone. Violation of this rule is fraught with the appearance of cracks and shedding of the plaster.

Errors

All problems that arise during the work or further operation of the house are associated with the use of inappropriate materials or violation of technology. To guarantee yourself a comfortable stay in a cozy environment, when plastering, it is enough to follow these recommendations:

We are not in a hurry to begin work immediately after construction is completed;
We do not plaster a house that does not have wall reinforcement; we choose a different finishing method;
we start with the inner surface, planning such work for the warm season;
we leave the house without external decoration for at least a year;
We use only plaster that is suitable in its properties for application to aerated concrete;
Be sure to pre-prime the surface;
We do not skimp on fiberglass mesh, carefully reinforcing each layer of external plaster;
For painting we use only compositions with appropriate vapor permeability indicators.

To summarize the above, main principle work on plastering walls made of aerated concrete blocks can be formulated briefly: do not rush! Only by maintaining the correct intervals between the stages of construction and finishing, ensuring the sequence of actions provided for by the technology and using the recommended plaster compositions, will you receive a beautiful and reliable coating that will give your building an aesthetically complete look and will last for many years.