How to plaster walls from a foam block - we get a perfectly flat surface. How to properly prepare and plaster walls from a foam block Step-by-step instructions for plastering external walls on a foam block

Plastering the foam block inside the building is an important stage in the repair. With their help, the wall material is protected from the effects of moisture and, thus, retains the main parameters - vapor permeability and lightness. When performing work, the main thing is to choose the right material and follow the technology.

Internal plaster of the foam block: how to do it right?

In the construction of any residential building, walls are one of the main elements. And one of the most popular modern materials for them is foam concrete. The advantages of foam blocks are their affordable price, lightness and good thermal characteristics. However, in order to preserve the advantages of the enclosing structures, they should be finished. The main way for this is to plaster the foam block from the inside and outside. Moreover, given the high humidity that is created during the work, the interior decoration is performed first.

Features of foam block walls

Due to the fact that aerated concrete is made from a cement mortar, into which microbubbles of air are involved with the help of a special technology, one of its characteristics is the ability to "breathe". This, in turn, allows you to ensure an optimal level of humidity in the premises. Another plus is high fire resistance and, at the same time, water resistance. Thus, during a fire, foam blocks do not burn, and when water hits the walls, it evaporates quickly enough without harming the structure.

It is worth noting the absence of mold on the foam concrete walls, and high heat and sound insulation properties. Therefore, such material will become the best option and for housing in northern latitudes, and for a building on a busy noisy street. Moreover, the construction of structures from foam blocks is faster and cheaper due to their lightness - neither an expensive and overly strong foundation nor heavy lifting equipment is required to build a house. Moreover, the owners of the building will be able to save money on heating, and during further repairs. And one of the few problems that can arise during the construction process is the plastering of walls from foam blocks, which must be done correctly, accurately and using suitable materials.

The need for plaster

On the one hand, such a stage as plastering the walls of foam blocks inside and out could have been avoided. However, in this case, the following problems may occur:

unprotected structures will be exposed to sudden temperature changes and precipitation, gradually collapsing and losing their qualities;
increasing humidity will increase the weight of the walls and lead to subsidence of the house, the foundation of which is not designed for such loads.

Another disadvantage of an unplastered block is manifested only in cast products and consists in a too smooth surface on which not every putty is supported. For this reason, foam concrete is finished only with special materials. And before finishing it is imperative, removing the seams and possible irregularities (which are found even in cast foam blocks, but are especially characteristic of cut ones). However, after the plastering of the foam blocks inside is done, in accordance with the technology, the walls become not only protected, but also perfectly flat.

Preparation for work

Before plastering the foam block, you should choose the right tools and materials. First of all, when performing work, one cannot do without itself, a primer material and a special mesh. And the inventory that is needed to complete the work includes:

construction mixers;
buckets;
spatulas;
levels and plumb lines;
dowels;
washers;
nails;
spatulas;
metal brushes;
knives and rules.

When choosing how to plaster the walls of foam blocks inside, pay attention to the primer. This material is chosen from mixtures specially designed for finishing foam concrete, which must have certain properties. Firstly, a high degree of adhesion, in order to ensure a better degree of material seepage into the block. You can find such primers in the product range of such brands as Knauf, IVSIL, UNIS and Prime-Primer.

Prices for materials for pretreatment of walls

Name	Type of	Packing, l	approximate cost
Ceresit CT 19	Water-dispersive, for processing walls made of foam concrete	15	730 RUB
Litokol PRIMER C-m	Deep penetration for interior work	10	720 RUB
Thomsit R 777	Strengthening primer for absorbent substrates inside buildings	10	860 RUB
Putzgrund RD313	Acrylic diluent interior and exterior primer	10	800 RUB
Terragrunt	Acrylic diluent interior and exterior primer	20	1620 RUB
VARNISH Primer Universal deep penetration	Impregnation with additives against mildew	10	RUB 440
Tikkurila Gravel Strong	Water-borne, deep penetrating acrylic primer with sanitizing and strengthening effect, for façade	10	1400 RUB

Stages of plastering

The first stage of plastering walls from a foam block indoors is to clean the base with a metal brush. Carefully cleaning the surface from dust, you should pay attention to oil stains. Having found such a defect, it is removed with the help of clay, which is first applied and then removed from the oily area. If after such a procedure a stain remains, it should be cut out by filling the hole with a solution.

Application of a primer under the plaster.

After cleaning, they are taken for a primer. First, a base coat is applied to the wall and allowed to dry. It is advisable to use it to obtain a smoother surface, and after applying the solution with a spatula, level the surface to remove excess and add them to the remaining empty places. The second layer is applied to the dried first layer. This stage is no less important, since the main task of the primer for foam blocks under plaster is to create conditions that are most suitable for the adhesion of blocks and plaster.

Foam block plaster on lighthouses

Regardless of the unevenness of the walls, it is advisable not to make the primer layer thicker than 2 cm.If the enclosing structures have too much large swings, they should be eliminated by installing drywall.

Using a mesh for cement-based plastering

A further technique, how to properly plaster foam blocks, consists in performing the following actions:

Preparation of plaster - pouring the dry mixture into a suitable container (bucket or tank) and stirring with an electric drill with a special nozzle to a consistency reminiscent of sour cream;
Installation of a grid, which is indispensable if the walls of the house are made of cast foam blocks. The reinforcing material is fixed and stretched with dowels;
Application of the first layer of plaster;

Plastering

Waiting for the already applied material to dry;
Laying the finishing layer, which should be thinner than the first;
Final finishing of the premises. If painting work is chosen for this, preference should be given to special silicate paints with increased vapor permeability.

To maintain the vapor permeability of foam blocks, when we plaster the foam blocks inside, the thickness of the inner layer should be no more than 20 mm. In this case, the thermal conductivity of the wall turns out to be uniformly increasing. And moisture, without lingering inside the structure, comes out without causing damage to the finish and the appearance of mold.

Features of work

An important point when performing plastering work is the observance of a certain period from the beginning of the construction of the building. Due to the fact that foam concrete immediately after production has a high humidity that exceeds the allowable value during operation, it is recommended to plaster it not earlier than six months after the walls of the house have been erected.

Other nuances of finishing include:

the need for preliminary sealing of wide joints long before plastering foam blocks indoors. This will save time if noticeable irregularities on the walls have to be primed repeatedly;
the impossibility of using cement plaster, the characteristics of which do not meet the requirements of finishing materials for foam concrete (it is desirable that the mixtures have the same permeability with the blocks);
the need to lay a reinforcing mesh with an overlap of at least 10 cm, as a result of which the layer is closed. Failure to comply with this recommendation may lead to an increase in the likelihood of the finishing layer falling off some time after completion of the work.

Summing up

It is possible to ensure a high-quality result and a long service life of the enclosing structures only by adhering to the requirements of technology and using suitable materials. By doing everything right, you will get well-plastered walls that can protect the building from moisture and frost. And the house itself will stand much longer, keeping the temperature and humidity comfortable for its inhabitants inside. Watch a video on foam block plaster in different ways.

How to plaster foam blocks from the outside, the question arises immediately after installing the plane. And this is not an unimportant issue. After all, the material saturates moisture and exterior decoration required.

The better to plaster the foam blocks inside, we will consider today. You will find out the most acceptable options and make right choice... And the video in this article will help you with this.

Why finishing is a must

The best option used when conducting finishing works on internal surfaces, as well as for facing various aerated concrete and foam concrete buildings, plaster is used. Today it is professionally selected and perfectly applied plaster that is able to optimize various (including technical, operational, insulating) characteristics of building materials made of foamed concrete.

There are a number of positive aspects when working with plaster with this group of building materials:

Protection against the adverse effects of high humidity;
Increasing the thermal insulation of structures;
Increasing the resistance of building materials to sudden temperature fluctuations or other negative aspects that can shorten the life of buildings;
Prevents carbon dioxide and dust from saturating building materials, due to interaction with which the shrinkage of structures can accelerate;
Possibility of free removal of products of household vapors through the thickness of buildings from the inner surfaces of load-bearing walls.

Attention: The ability of the plaster to pass steam makes it possible to avoid the appearance of moisture on the surfaces of foam blocks and aerated concrete walls, which significantly reduces the settling of fungi and various bacteria, due to which the building material can prematurely collapse.

So:

The best option is to finish the walls with plaster on both sides, which allows them to "breathe".
In the event of obstacles to the escape of steam, foam concrete and aerated concrete blocks wear out rather quickly, and it becomes necessary to carry out renovation work on a plastered surface. So, after several cycles of freezing and thawing, moisture that has accumulated under the finish can contribute to the appearance of various cracks and, as a result, the integrity of the plaster can be violated.
The presence of "double-sided" plaster allows you to perfectly remove household gases outside, and fresh air is able to freely enter the premises.

Which mixture to choose

Foam block plaster is selected depending on the place of work.

There are two solution options here:

For outdoor surfaces

How to plaster the foam block from the outside and what is better suited:

Material for external plaster perfectly tolerates high temperatures;
It should also be used for finishing rooms with high humidity;
The most commonly used formulations with the addition of cement.

For interior surfaces

The better to plaster the foam block inside and for this case there are compositions for interior decoration:

They do not tolerate temperature extremes and high humidity as well as in the first option. But they have a finer fraction and here it will be possible to make a perfectly flat surface and smooth;
The most commonly used additive is gypsum. It grasps quickly and therefore is not worth doing a lot at once.

Block types and their influence on the choice of plaster

Initially, the creation of foam concrete blocks was considered as the appearance of a new insulation. Over time, large blocks began to be used in the installation of partitions and load-bearing structures, which was explained by the simplicity of technological work.

It was here that the question of finishing work arose, since many types of putty and plaster simply did not hold on to the rather smooth surface of foam concrete products.

So:

At the moment in the arsenal of builders there are two options for foam concrete blocks made by different technologies. This explains the differences in one building material that sounds like “ foam concrete block". The foam block than plastering depends on the environment it is in.
Casting technology in the manufacture of foam concrete blocks. In this way, the solution is poured into a specially designed cassette, where the formation and complete drying of this building material occurs. With this technology, the surface of the block contains irregularities and protrusions, and when the block is removed from the mold, the corners of the finished product may be chipped.
Such blocks, as a rule, are dark in color, have damage at the corners and contain residues of an oily composition on the walls, which is used for demoulding. These features explain the insufficiently good adhesion of the plaster to the walls of the blocks, therefore, to improve adhesion, the required area is cleaned and processed with sandpaper.
Sawing method for the manufacture of foam blocks. In technology this method an outflow of a sufficiently large foam concrete product is laid, which is subsequently sawn into certain building elements according to the standard or individual requirements of customers. The surface of the walls of such blocks is rough, which greatly facilitates the plastering process.
The assortment of goods presented in building supermarkets allows you to select the optimal compositions for plastering surfaces with a cellular structure, in particular, on walls made of foam concrete. As a rule, these mixtures have a gypsum base and are characterized by increased adhesion, elasticity and vapor permeability. Thanks to the implementation of the manufacturer's recommendations, it is quite simple to prepare such a composition.

Attention: In the process of work, it is necessary to take into account that the plaster of foam concrete walls that were made by the casting method, in contrast to blocks made by the sawing method, may require a solution with increased adhesive performance.

Preparatory work

Before proceeding with the plastering of the foam concrete walls, it is imperative to process the required area with a soil solution, which will serve as the basis for the plaster.

Caution: It is preferable to use mixtures with deep penetration and apply them twice.

The quality of the plastered exterior walls of structures can be improved by using a primer containing hydrophobic substances. And the treatment of the top layer of plaster with a specially designed water-repellent impregnation will help to avoid the spread of cracks along the outer layer of the coating and further cracking of the plaster.
The reinforcing (fiberglass) mesh attached before plastering, which has increased resistance to aggressive alkaline media, helps to improve the adhesion of the surfaces of foam concrete walls to the plaster. This technique significantly strengthens the strength of areas and is recommended for use on problematic surfaces, which include window and door openings, joints of adjacent surfaces.
The thickness of the finishing plaster should be no more than 2-3 cm, since structures built from foam concrete blocks do not require a thick layer of it.

Necessary conditions for the quality of plastering

In order to obtain a high-quality protective coating, it is necessary to use plaster compounds that meet the following characteristics:

Increased adhesion to foam concrete products;
Resistance to temperature fluctuations;
Durability and strength;
Hydrophobic properties;
Excellent vapor permeability.

Attention: Such properties are possessed by plaster mixes, which are designed specifically for finishing work on foam concrete surfaces.

For convenience, packages with such compositions have a special marking indicating the possibility of use on surfaces with a cellular structure. The price of special mixtures, as a rule, is higher than that of classic solutions, which is compensated by the end result - obtaining a high-quality coating. There is also an instruction, which indicates whether the coating is intended for external or internal surfaces.

Carrying out work will require:

Level;
Self-tapping screws;
Soil solution;
Roller;
Trowel;
Profile or board;
Rules.

Surface preparation

Plastering foam blocks begins with the preparation of the plane and the determination of the level of application of the layer. All the work can be done with your own hands, you can look at the photo.

We take the fishing line and pull the walls along the diagonals. We apply a level and you can immediately see which layer needs to be applied.
If the layer is more than five cm, then you should think about leveling the plane with drywall.
With particular care, you need to monitor the absence of oil stains on the surface. If they are found, it is necessary to apply clay to the spots and remove it after drying, thus eliminating unpleasant finds. In case of failure, the stain is completely cut down, and the gap is sealed with a solution.
A good finish involves the use of a deep penetration primer.
For smooth plastering, it is necessary to install beacons or use a reinforcing mesh.
The surface of the wall must be sprayed with water. The plaster solution is applied with a trowel, sprinkling it in small quantities on the walls.
If you have a layer up to one cm, then you can apply the composition directly to the plane. If more, then it will be necessary to reinforce the plane and this will make the connection the most reliable and durable.

Step-by-step scheme for plastering foam concrete blocks

Attention: In case of self-preparation plaster mix stains on the walls and various technological errors in the future are possible. Therefore, the proportions must be maintained and the mass must be homogeneous.

So:

You must stop your choice on high adhesion plaster mixes. As practice has shown, in addition to specially designed compounds, gypsum solutions proved to be excellent.
After filling the entire area with plaster, it is necessary to level the surface using the rule, while removing the excess and adding the missing volume to the empty areas.
To obtain even corners, it is necessary to set a mounting profile or a board in them using a building level.
The mixture must be applied along the installed device, and after drying, carefully remove.
Excess solution must be removed after it dries slightly, in this case it is easier to correct it, since it does not "float". However, it is necessary not to let the mixture dry completely, since it will be almost impossible to correct irregularities in such a situation.
Complete drying of the wall surface is completed by stripping with a rule and cleaning the frozen lumps of the mixture. Then they start finishing work.

You now understand how to plaster foam blocks and can do this work yourself. The most important thing is not to rush and choose the right composition.

Machine plastering of walls from foam blocks

Such construction material as foam blocks is widely used for the construction of residential and industrial buildings, ancillary structures. Such products have a porous structure with closed cells, which makes it possible to protect the load-bearing structures from moisture. Plastering walls from foam blocks allows you to improve appearance surfaces, provide additional protection against various aggressive factors and mechanical stress.

The most popular options for finishing the interior walls of a house are considered to be leveling with a plaster layer, as well as painting. The choice of such materials is determined by the minimum coefficient of thermal conductivity of foam concrete at the design thickness of the supporting structure. In our article, we will deal with all the nuances of plaster on the foam block, get acquainted with the technology of work and the types of compositions.

Decorating a house made of foam blocks with a plaster mixture is in many ways similar to plastering aerated concrete or brickwork. There is a difference between such works, but insignificant. Let's take a closer look at the process in more detail.

Foam concrete walls can be plastered during the warm season at positive temperatures (the recommended range is + 5 ... + 30 degrees). To prevent cracking of the laid layer, plastering should be started no earlier than 4 months after the completion of the building. During this time, the house will have time to shrink.

Through a smooth surface, foam blocks have poor bonding ability, therefore, before applying the leveling mortar, it is necessary to prepare the base accordingly. To improve the adhesion of the material, laying on a base layer of a special substance, a primer, helps.

Advice! For application on foam concrete, use a deep penetration primer, for example, prospectors or Optium at a cost of 40 rubles per liter, as well as Ceresit ST 17 at a cost of 55 rubles / liter.

Applying a primer to a foam block wall

To improve the properties of the base surface of foam blocks, it is recommended to apply the primer three times. So the first layer will penetrate deeply into the structure of the material, the second will fix the effect of the substance, the third layer will bind the base to the plaster.

The action of the primer can be compared to that of the foundation of a building. The mixture creates a reliable base layer to which the plaster will be fixed. From the main technical characteristics and the quality of the primer will depend on the durability of the building finish. This solution is applied with a paint brush or roller over the entire surface of the wall without gaps. The main work can be carried out only after the primer layer has completely dried.

Composition of finishing for a wall made of foam block

Aerated concrete plaster is a complex mixture. It consists of the following materials:

A special bonding agent, the primer is applied with your own hands to the base surface of the wall. When using the Ceresit CT17 brand for the preparation of the solution of the first layer, it is necessary to stir the composition in a proportion of 1k6 with water. The second time the primer is stirred in a ratio of 1 to 3, the last time 1 to 2. Consumption of the substance is up to 500 milliliters per square meter.
For minor elevation differences on the base surface, the grid is not used. As a leveling layer, you can use Ceresit St 24 plaster, which is specially made for aerated concrete.
After the layer has dried, a primer is applied to the wall.
The finishing of the enclosing structures is considered decorative plaster, which is laid in a thin layer.

Note! In the presence of perfectly aligned walls, after applying the primer, a fiberglass mesh is fixed on the surface, then the third and fourth layers are laid.

What should be the thickness of the plaster

Foam concrete plaster

Calculation of the size of the leveling layer is necessary in order to displace the dew point outside the enclosing structure. The thickness of the mortar should be such that the plaster can reliably adhere to the wall surface and remove water vapor without hindrance. If moisture lingers in the structure of foam blocks, then soon mold or mildew will appear on the surface of the internal partitions of the building. Harmful microorganisms will cause the solution to flake off when exposed to sudden temperature fluctuations.

According to experts, the plaster on the foam block from the side of the facade should be laid in a layer of 5 to 10 millimeters; for internal walls, the thickness of the solution can be increased to 1-2 centimeters. From this we can conclude that the outer layer of the plaster is half of the inner one, which will provide the necessary thermal conductivity (each subsequent layer must be equal to or greater than the previous one). Given the overall dimensions of the foam block, this ratio is considered the most favorable option.

If a block house has external insulation (expanded polystyrene, polystyrene and other materials), then the thickness of the plaster for interior wall decoration is not important. The calculations are applicable for structures made of foam blocks, which are covered only with leveling mortars without the use of other materials.

Which mixture is better to use for finishing foam concrete

When choosing a plaster for leveling the internal walls of a building with your own hands, you need to focus on the adhesion of the composition, the larger it is, the better the solution is suitable for foam concrete. The most popular store mix options are:

Coverlix;
Ceresite CT24;
Profit;
Contact MN;
Belsilk T-32.

To save financial resources, some users use cement mortar in the proportions of raw components cement / lime / sand = 1: 1: 3 for wall decoration from blocks. To improve the plasticity of the mixture, 5% of chalk is added to its composition in relation to the binder, cement. Such a solution is much cheaper than store counterparts, but only experienced builders can work with it. For better fastening of the trim, a mesh is fixed to the base.

Note! Walls made of foam blocks must not be covered with cement laitance plaster. The material will absorb some of the liquid, and the second part will evaporate into the atmosphere. In the future, the solution can be wiped off the surface with your hands. This mixture also cannot be used as a primer, it will not be able to provide the necessary adhesion to the base.

Plastering technology

Decorating the interior walls of a residential building with plaster has some nuances. Experienced builders it is recommended to apply the composition to a previously prepared base. To improve adhesion, the surface of the foam blocks can be treated with a trowel or a high-hardness metal brush. After carrying out such operations, the protective layer of the blocks is destroyed, the pores of the foam concrete open and its surface becomes rough, has better adhesion.

It is recommended to apply the plaster simultaneously from the outside and inside of the building. This requirement can be argued by the fact that foam concrete is not able to absorb moisture. When dry, moist air from the plaster will be discharged to the outside.

Note! The leveling mortar on aerated concrete walls takes longer to dry, even if the material is applied in a thin layer. This enables a more thorough leveling of the surface.

The plaster is applied to the wall by spraying from a bucket rather than spreading it with a spatula. After preliminary leveling with a rough layer, throw in a decorative mixture. Liquid cement-sand mortar can replace the primer. After laying it, the surface of the wall is covered finishing materials from a spray gun or a paint brush. For painting walls made of foam concrete, it is recommended to use water vapor-permeable paints on a silicate or silicone base.

Mesh laying

Adhesion of a metal mesh with a mesh of 4 * 4 or 5 * 5 millimeters will help to improve the adhesion of the base. This material is made of a thin wire with a diameter of 1-2 millimeters. When choosing a mesh, pay attention to its resistance to alkalis. Low-quality products will soon become unusable and lead to plaster peeling. The metal mesh is fixed on the surface of the aerated concrete wall using dowels or embedded in the leveling layer of the mortar. After it dries, decorative plaster is laid.

More details about aerated concrete wall plastering can be seen in this video

Of course, a protective coating must be applied to a wall made of foam concrete materials. Dust in the air settles on the surface of the building material, and atmospheric precipitation also negatively affects. As a result, the product, which is in an unfavorable environment, begins to change color, which does not in the best way affect the appearance of the structure.

However, this result cannot be attributed to the biggest nuisance. Much more undesirable is the penetration of water into the porous structure of the material, which has a bad effect on the internal climate of the building. Blackouts, dampness and mold may also appear, but already on interior walls... That is why it is necessary to plaster walls from foam blocks outside the house. It should be made with materials that allow air vapors to pass well outside.

Plastering walls from foam blocks from the outside is the best solution, but you should know that concrete wall poor adhesion to cement-sand and lime plaster is observed. It simply won't stick to the surface as it should. You will need a special plaster that is commercially available. Experts recommend buying a ready-made mixture rather than doing self-preparation. The material is manufactured taking into account improved adhesive properties, which are unlikely to be "duplicated" by a hand-made product.

The composition of the solution includes gypsum, and you can work with the mixture in different conditions... Also, plastering walls from foam blocks from the outside will allow:

Refine the appearance of the building;
Protects the material from moisture;
Will give vapor permeable characteristics;
Prevents the negative effects of temperature extremes;
Will increase the thermal insulation performance for the house;
Prevents shrinkage of the structure, possible due to the ingress of dust and carbon dioxide on the walls.

It can be plastering the walls of the garage outside on foam blocks, a private house and any other building from this building material.

Before plastering the walls of foam blocks from the outside, you need to learn about the lines of production of blocks. They can only be used when at least a month has passed. This precautionary measure must be observed without fail, since cracks may appear on uncured material, which will further lead to deformation of the coating.

To carry out the work you will need:

Capacity for preparation of the composition;
Primer;
Level;
Net;
Metal brush;
Nails, dowels;
Drill;
Spatula, brushes;
Knife, plumb line;
Chisel.

It will be good if there was a note on the container with the primer and on the package with the plaster that the product is intended for foam concrete. Then when purchasing this product you don't have to worry about the most effective grip.

Just like working with any other surface, plastering walls from foam blocks outside the house needs preliminary cleaning of the surface from dust, debris, stains. Use a wire brush to help you clean up more thoroughly. The possibility of using a drill for these purposes, where you can attach the nozzle, will not hurt.

The next step is a primer, which will be applied in several layers to carefully close deformations and improve adhesion. The second layer is applied after the first dries.

Do not underestimate the surface priming process. It depends on him how well the applied material will hold.

After the walls are prepared, you can start mixing the mixture. You can do this manually, or you can use a drill and a special nozzle. In this case, the composition will be more uniform, without lumps.

Since plastering exterior walls made of foam blocks is not much more difficult than working with other surfaces, of course, with proper experience, then there will be no difficulties for you here either.

You will need a spatula to apply the first layer of material. Put the required amount of mortar on it and apply to the wall. It is necessary to act carefully, moving from the bottom up.
Foam concrete has a cellular structure, so do not use a layer that is too thick. Thoroughly smear the product, which as a result should reach no more than 10 mm;
After the first layer of material has dried, it is necessary to use a reinforced mesh in order to enhance the strength characteristics of the structure. The material needs to be stretched well in order for it to adhere well to the surface. For a thick plaster layer, a metal product is suitable, and in other cases it will be possible to do with a nylon one. It is fixed with nails or dowels;
Then you should re-plaster the wall, and wait until it dries completely, then apply a primer;
When the result of the work is completely dry, it will be possible to start performing decorative work. You can paint the walls with paint, but it must be indicated that it is suitable for this type of material.

Materials with a silicate or silicone composition are best suited, due to their vapor permeability. If you have any doubts, it is best to consult a specialist.

We think that at this stage it became clear how to plaster the outer walls of foam blocks.

Before plastering a wall of foam blocks from the outside, familiarize yourself with a number of technology features.

Before proceeding with the application of the solution, the installation of beacons will be required. These elements will help you get a flat surface in the process.

It is important to remember what temperature is acceptable for outdoor work. For example, you have plans to plaster the walls of the garage outside on foam blocks. The temperature outside should be between +5 and +30. If you still have to work on a hot day, it is recommended to spray the building material with water.

You must clearly decide how to plaster the walls from the foam blocks from the outside. We have already mentioned that it has a surface that is too smooth, which would seem to be good, since it is possible not to level the surface, but, unfortunately, the mortar does not adhere to it.

To increase adhesion, a primer or special concrete contact is used. Such compositions are applied and dry for about a day, and are partially absorbed into the material, and partially solidify on the surface, creating the layer necessary for adhesion.

A mesh is also suitable, thanks to which additional fixation of the plaster occurs. Shouldn't be ignored preparatory work... This is actually a very important step to ensure long lasting results and prevent delamination, cracks and other defects.

Plastering of foam block walls occurs only after thermal insulation work has been carried out. The material used is good insulation, but at the same time, the temperature changing at the joints can lead to the appearance of condensation, which will not have the best effect on the plaster. That is why it is worth monitoring the applied layers of the product. Strict relationships must be observed between the inner and outer layers, where the first must be 2 times smaller.

From all of the above, we can conclude that the work should take place in accordance with the instructions, taking into account a number of rules. In addition, you need to pay attention to the packaging with the compositions, where the manufacturers prescribe recommendations.

How to plaster a wall of foam blocks outside with your own hands: video

What is a foam block? This is a fairly relevant and popular building material for modern market, it is distinguished by its strength, excellent vapor permeability and very light construction. A significant disadvantage of foam blocks is poor shrinkage, due to which the material dries up and a carbonization process occurs, and such building material does not have a very attractive appearance. But such minor flaws can be corrected by plaster.

With the correct use of the plaster mixture, you can get rid of all the imperfections of the material, as well as increase its strength and extend its service life.

Positive properties of plaster for foam blocks

Pros of facade plaster:

It perfectly protects the house from excess moisture and dampness.
Strengthens the properties of the base material, improves its positive qualities.
Creates a healthy indoor climate.
The house is better ventilated, the air in the room becomes much more.
Easy and convenient to use.

Plaster is best suited for finishing various buildings using foam concrete. It significantly improves all the qualities and characteristics of concrete structures or concrete-based materials. It also solves a number of problems of this material, better retains heat in the room, protects against excess moisture, supersaturation with dust or carbon dioxide, causing the walls to shrink.

Foam block plaster reduces the negative impact low temperatures and increases the service life of foam blocks. It creates a protective layer that prevents harmful vapors from entering the room from the inside of the load-bearing walls, this process helps to remove all the generated steam outside the room. Plastering foam blocks does not allow excess moisture to accumulate inside, and provoke the development of bacteria and fungus. For better vapor permeability, it is best to apply plasters on both sides.

Facade plaster - how to choose the right one

In order to choose a really good plaster, first you need to prioritize what qualities you need more. Plaster contains various binding elements, depending on their types and qualities, the properties of the plaster will also depend. Plaster happens different types, possesses various features and characteristics, as well as each of the types has its own method of application.

Plaster consumption

Plaster consumption is approximately two and a half, three and a half kilograms per square meter. And the service life of the facade plaster will depend on the weather conditions and the climate in the area in which the building will be built. In temperate climates, it can last up to 15 years.

It is worth choosing a special plaster for surface finishing, and exactly the one that consists of a cellular structure. This composition of the mixture has good adhesion characteristics and high optimized properties. In addition, such a mixture is much more elastic, has excellent vapor permeability. Such a mixture is made on the basis of gypsum.

To work with walls from individual blocks produced by casting, in this case, you need to choose a mixture with increased adhesion characteristics.

Varieties of plaster for facades:

Elastic facade plaster. Used for the final stage of facade finishing. It is easy to work with it, using it you can create various patterns.
Wet plaster. It is used to insulate the wall surface in buildings that have a decorative coating.
Silicone plaster. The most popular type of plaster, due to its versatility and protective properties.
Acrylic finish. It is used to improve the ventilation properties of the wall. Suitable for climatic zones with frequent temperature fluctuations.
Facade mineral plaster. The most budgetary one. Thanks to the use of this mixture, the wall surface becomes much stronger and increases moisture resistance. When using it, you can give the building different colors.
Silicate plaster. Ideal for buildings using blocks with a porous structure. This mixture has a high level of vapor permeability. It is completely immune to external contamination.

Surface preparation of foam blocks

Foam blocks are manufactured using a special injection molding technology. The material is poured into special molds in which it hardens and forms, the process is quite simple. Unprotected surface of the material, during drying, bumps and irregularities begin to appear. When removing the material from the molds, it is very easy to damage them, small chips and irregularities may appear, especially at the corners of the product.

Foam block in forms

In the production process, a special oily composition is used for simple dismantling of the formwork, which can subsequently remain on the surface of the foam blocks. This contributes to poor adhesion of the entire product. In order for the adhesion of foam blocks to be better, the surface of the product should be sanded or simply processed.

Also, for the production of foam blocks, another method is used - sawing. In this case, the mixture is poured into one continuous mold until it hardens. Then they are taken out and sawn into pieces of the desired size. Walls made of foam blocks made in this way are much easier to plaster, this is due to the rough cut surface, which helps the material to adhere better.

Recommendations for the correct execution of plaster foam blocks

In the process of plastering, the thickness of the layer of the applied mixture and its air permeability play an important role. Due to the observance of these two characteristics, the steam that has entered the structure completely will escape through the plaster and the walls will breathe.

With the wrong plaster, steam will remain inside, negatively affect the walls, thaw and freeze. Such processes will negatively affect the structure, mold will begin to develop, excess moisture will accumulate in the plaster itself, which will subsequently crack and crumble.

In order for the walls to breathe, the thickness of the layer of the applied mixture must be twice as thick as the outer one. The foam block should not be plastered with a thick layer of the mixture, due to poor moisture absorption, the plaster will dry for a very long time. If you decide to use ordinary plaster, then it is better to use a special reinforced mesh when finishing the injection-molded foam block, it will improve adhesion.

Walls that absorb moisture worse, concrete and foam concrete should be plastered several times. The first stage is sprinkling the walls with a solution, and after complete drying, applying a second, main layer. For painting plastered walls made of foam concrete, special facade paints based on silicone or silicate are used.