Insulating plaster: application technology. Warm plaster Insulation with warm plasters

Warm plaster is offered for sale as insulation. But construction specialists do not consider this material as a possible alternative to insulation materials for thermal insulation of buildings. And only in some cases is it recommended for use. Why? Is it necessary to insulate using a heat-insulating plaster layer? How to apply it correctly?

What is the difference between warm plaster?

The answer to why warm plaster cannot compete with insulation in conventional technologies insulation lies on the surface. Its thermal conductivity coefficient is 0.065 - 0.12 W/mK, while conventional insulation is 0.033 -0.04 W/mK. Those. almost 2 times.

To achieve the effect that is obtained from the use of conventional insulation, the layer of warm plaster must be 2 times thicker. If the usual appropriate layer of insulation for a façade is 10 cm of polystyrene foam, then it can only be replaced by 20 cm of plaster.

But such a layer is impossible - it is too heavy and threatens to collapse and be dangerous. With insulating plaster, it is simply very problematic to even achieve the heat transfer resistance values prescribed in SNiP. This does not allow this material to be reliably registered in those. documentation.

Not profitable

In addition, the cost of warm plaster is 2-3 times higher than that of insulation of the same volume. As a result, we get a loss on money investments compared to “conventional methods” for heat saving $/W by 4 (!) times. There is no economic feasibility of making direct thermal insulation with the material in question.

It should also be taken into account that heat-saving plaster is not a finishing material. Its surface, as well as the insulation, must also be covered with a final layer of finishing.

Varieties

To decide on the choice of warm plaster, you need to take a closer look at its composition and characteristics.

The plaster becomes heat-saving due to the presence of granules and insulation particles in the composition. Most often, the same foam is used as part of a sand-cement mixture with plasticizers and fastening additives.

Another common base for warm plaster is expanded vermiculite and/or perlite.

Plasters based on these materials have similar thermal conductivity properties, but vermiculite plasters have high water absorption, therefore they require protection from water ingress and are not used in basements or on foundations...

There are also mixtures based on sawdust and cellulose. They have a lower cost, but their thermal conductivity is much higher, and specific gravity more.

To choose warm plaster, you must first determine the places where it can be used. Let's take a closer look.
Let's consider in order the advertising statements of manufacturers about the purpose of warm plaster.

The wall remains single-layer

Insulation of facades, walls, ceilings. First of all, walls made of large-format blocks - aerated concrete or porous ceramics. An increase in the thickness of the masonry of these materials entails a significant increase in cost, and not only the walls, the requirements for the foundation increase. Heat-saving plaster will help bring the heat transfer resistance of a wall made of warm blocks to the requirements of the standards.

The most important thing is that the wall will remain single-layer - only a load-bearing layer of blocks. A single layer wall has very significant advantages over multi-layer ones with a layer of insulation, primarily in terms of durability.

Leveling surfaces and thermal insulation of pipelines..

In fact, it’s the same thing - both pipelines and walls need to be insulated to the maximum. Typically, pipelines are insulated with the best effect using a shell made of extruded polystyrene foam. But sometimes it is necessary to insulate already laid pipes, and this is usually easier to do only with warm plaster.

Warm plaster can be applied in a layer of considerable thickness, and therefore it can be used to level very uneven surfaces.

A significant layer can be placed where it is difficult to insulate - in hard-to-reach places, closed cavities...

Characteristics

Typical characteristics for warm polystyrene based plaster:
Thermal conductivity coefficient is 0.7 W/mK.
Flammability group - G1.
Specific gravity - 200 - 350 kg/m3.
Water absorption - 70%.
Cost - from $30/sq.m.

What can you use insulating plaster for?

Warm plaster must be applied in accordance with the manufacturer's recommendations. But that doesn't mean it will work out best solution from the point of view of insulation.

A specialist should make a decision about wall insulation (additional insulation) with warm plaster, or such a decision should be in the design documentation.

Also, warm plaster can be suitable for sealing any cracks, hard to reach places, joints of structures, where “adjustment” of the insulation is most problematic, and a tight fit cannot be obtained.

On the wall on both sides - significant additional insulation

The possibility of applying warm plaster on both sides - from the outside and from the inside - may also be considered. In this case, you can get a very significant insulating effect, for example, on a wall made of porous ceramics. On the inside, it is recommended to use plaster without expanded polystyrene, the environmental friendliness of which is questionable.

For a material such as warm plaster, with its significant cost, there are also places of application where it will be optimal and appropriate. First of all, this is an increase in the heat transfer resistance of enclosing structures made of heavy and light materials, while maintaining single-layer properties.
Also, insulation with warm plaster will save heat where it would seem that heat loss is inevitable...

Video - application process

How to apply warm plaster can be seen in the film

High cost utilities and energy resources can push owners of apartments and country real estate to carry out additional work over wall insulation. One of the options for increasing the thermal properties of such bases is the use of special warm plaster. What is it and what kind of coating is it - read about all this in our article.

Thermal insulating plaster: types and features

In the formulations of warm plasters, some of the components of conventional leveling compounds are replaced with materials that can be used to enhance the thermal insulation properties of the hardened mortar. For example, quartz sand or part of it is replaced with perlite, vermiculite, polystyrene foam, etc. additives in bulk form. Cement or gypsum can be used as a binder. In the first case, the finished composition is suitable for external and internal decoration, in the second - only for interior works due to the high hygroscopicity of gypsum.

The main part of dry mixes presented on the domestic market is perlite plaster. Expanded perlite is used as a filler, which in appearance may resemble coarse sand or fine gravel of a grayish-white color. The material is quite light - bulk density around 200-400 kg per cubic meter. m. depending on the grain size. It is somewhat lower for expanded vermiculite. The density of this additive to plaster is approximately 100 kg per cubic meter. m. (bulk). Another property that must be taken into account when using thermal insulation solutions is the high hygroscopicity of hardened coatings. The hygroscopicity of the material is up to 5 volumes of water per 1 volume of expanded component.

Despite the high water absorption coefficients, vermiculite and perlite plasters can be used for external insulation of a building. The main thing is that they are not directly exposed to precipitation, and the steam passing through the walls of the house does not linger in the coating.

The low density of the solution components ensures a reduction in the mass of the finished coating, which can be taken into account when designing a house. There is an opportunity to reduce the load on the foundation and rely on more cheap base for construction.

A short video about plaster based on polystyrene foam.

Two videos on how to prepare warm plaster with vermiculite.

Plaster Teplon (GK Unis)

You've probably heard about such a finishing material as Teplon plaster. This is a ready-to-mix dry mixture based on gypsum binder. A feature of the composition is the addition of perlite, a porous rock of volcanic origin. It is this additive that gives the manufacturer the right to call their plaster warm. Teplon mixtures can be used for interior decoration. The coating turns out to be relatively light, allows you to level the base and give it additional sound and heat insulation properties.

Types and technical characteristics

At the time of writing the review, the company produced four types of plasters under the Teplon brand. Moreover, three of them are intended for finishing dry rooms and actually have some thermal insulation properties, and the fourth, moisture-resistant modification is not positioned as “warm” (the thermal conductivity coefficient is not specified for it).

Remember that such coatings are highly hygroscopic, so we can talk about the advisability of their use only if the humidity in the room is normal. We are talking about “warm” compositions. And do not forget that you need to insulate the walls from the outside, not from the inside. Accordingly, using completely different materials.

To be fair, we note that the thermal conductivity coefficient of Teplon plaster is 0.23 W/(m×°C), and that of thermal insulation materials such as extruded polystyrene foam, ordinary polystyrene foam and mineral wool – 0.029÷0.032, 0.038÷0.047, 0.036÷0.055 W/( m×°C) respectively. And we remember that the lower this value, the better the heat-shielding properties are characteristic for the same thickness of the material. What does it mean? And the fact that achieving the same thermal protection of walls when using warm Teplon plaster is more difficult than when installing a special thermal insulation material.

Work technology

Requirements for temperature and humidity conditions for work are standard: from +5 to +30 ° C at relative humidity up to 75%. Because All brands of Teplon plaster are produced using gypsum binder, then the condition of the base must be appropriate: clean, dry, without damaged or poorly adhering parts of the wall material. Work surface primed with concrete active (for smooth concrete foundations) or soil deep penetration(for cellular concrete and other hygroscopic materials). Subsequent operations begin after the soil has dried.
Installation of plaster beacons is carried out according to the standard scheme; only the appropriate brand of Teplon solution is used to attach the beacons.
To obtain a solution of the desired consistency, add a kilogram of powder for every 450-550 ml of water. When using a moisture-resistant brand of water, take less - 160-220 ml. Mix using a special mixer or a puncher with a stirrer. After this, the mass is left alone for 5 minutes. and mix again. Further fate plaster is determined by the value of its viability.
The resulting composition is applied to the walls manually or mechanically (for the MN composition) in a layer 5-50 mm thick. The thickness of the ceiling covering is less - 5-30 mm.
An hour after mixing the solution, the layer of plaster is trimmed along the beacons using the rule. At this stage, all coating defects are corrected: depressions, bumps, waves, etc.
If it is necessary to apply a layer with a thickness of more than 50 mm, then this is done in several stages: layer by layer, after the previous coating has hardened, treated with a primer and over a plaster mesh.
On final stage surface glossing is possible. It is started 2 hours after trimming the set mortar. The coating is wetted clean water, rub with a special sponge grater, and the emerging milk is smoothed out wide spatula.

Umka

Some plaster mixtures Umka is also positioned as warm: UB-21, UF-2, UB-212. In addition to heat and sound insulation properties, the manufacturer is distinguished by the environmental friendliness of the compositions, their hydrophobic properties, non-flammability and frost resistance.

Compare brands of heat-insulating plasters Umka

Comparison criterion	UMKA
Comparison criterion	UB-21	UB-212	UF-2
Brief description	For all types of stone bases for interior and exterior decoration	For walls made of gas silicate and hollow ceramic bricks. Thin-layer, for interior and facade work	Finishing layer for finishing any type of stone bases, inside or outside. Thermal insulation properties are an option. In general, plaster is decorative in nature.
Recommended layer thickness, mm	10-100	5-7	up to 20
Volume of water per 1 kg of mixture, l	0,53-0,58	0,58-0,64	0,45-0,47
Consumption of dry mixture, kg/m 2 /layer thickness, mm	3,5-4/10	2,5-2,9/5-7	1,1/2
Viability of solution, min	60	90	60
Thermal conductivity coefficient of hardened plaster, W/(m×°C)	0,065	0,1	0,13
Price/packaging	€15/9 kg		€18/12 kg

All work is carried out in almost the same order as for Unis products. Because in essence it is a similar product.

Below is short video about Umka plaster.

Teddy bear

Warm plaster Mishka is suitable for finishing walls made of any materials, both for external and internal work. The thermal conductivity declared by the manufacturer is 0.065 W/(m×°C) - the same as for Umka UB-21 products, which gives rise to some thoughts on this matter. 7 kg of dry mixture is mixed with approximately 3-3.3 liters of water, the solution consumption is approximately 3.5-4 kg/m2 at a 10 mm layer. The cost of a bag (7 kg) is approximately 650 rubles.

Knauf Grünband

Another option for a ready-made mixture from a well-known manufacturer. You can read more about it.

Making warm perlite plaster with your own hands

You probably already noticed that all compositions for warm plaster contain components that determine their thermal insulation properties. Most often it is perlite or vermiculite; mixtures with expanded polystyrene are also found. It is their low thermal conductivity coefficients that allow, on average, to obtain good values for finished coatings. Using such additives together with or instead of certain fillers, such as sand, as well as binders like gypsum or cement, you can be sure of mixing a mixture with the desired properties.

Unfortunately, prices for ready-made mixtures don't inspire confidence. What if you prepare the solution yourself?! Moreover, individual components, such as cement, perlite, lime, are relatively inexpensive. For example, a ton of M500 cement can be bought for 3000-4000 rubles, 20 kg bags of slaked lime - 170 rubles each, perlite (grades M75 or M100) - approximately 1500-2000 rubles. per cubic meter If the amount of work is large, and the budget for implementation is limited, then it’s time to get creative. We offer you several recipes for making warm perlite plaster with your own hands.

1 part cement to 1 part sand and 4 parts perlite (calculated by volume) is mixed with water until the required consistency is obtained (thick sour cream);
the proportions of cement and perlite by volume are 1 to 4. So, for 375 kg of cement you will need approximately 1 cubic meter of perlite sand. The mixture is mixed with 300 liters of water; PVA glue can be used as a plasticizing additive in a volume of 4-5 liters. The glue is mixed in water, to which a dry mixture of perlite and cement is subsequently added;
the volumetric ratio of cement and perlite is 1 to 5. For 290 liters of water, use 4-4.5 liters of PVA, 300 kg of cement and a cube of perlite;
— by volume: 1 portion of cement, 2 portions of sand and 3 portions of perlite. Can be used as a supplement liquid soap or PVA in an amount of no more than 1% by weight of cement;
270 liters of water will require a cube of perlite and 190 kg of cement;
1 volume of cement, 4 volumes of perlite, approximately 0.1% by weight of cement, PVA glue;
the volume ratio of cement to perlite is in the range of 1:4÷1:8. The additive can be liquid soap, detergent for dishes, PVA – up to 1% by weight of cement;
pre-prepare the mixing solution (hereinafter referred to as RZ): dissolve the sodium salt of carboxymethylcellulose (CMC) in a measured volume of water in a volume of 0.5% of the expected volume of warm plaster, as well as plasticizers - 0.5% by weight of the subsequently added cement. All components are thoroughly mixed and the solution is allowed to settle until the viscosity of the CMC increases. Further variations are possible depending on what density the plaster needs to be obtained (bucket - 10 l). For example, for 12 liters of RZ add 12 liters of cement, 2 buckets of perlite, 2.5 buckets of sand (the density of the resulting solution is approximately 1500 kg per cubic meter). For the same volume of RP, 1.5 buckets of sand, 3 buckets of perlite, 1 bucket of cement are poured - a mixture with a density of 1200 kg per cube is obtained. For 20 liters you can mix about 5 buckets of perlite, 1 bucket of sand, 12 liters of cement - we get a solution with a density of about 800-900 kg per cubic meter

All these PVA and liquid soap can be replaced with superplasticizers, for example, from Poliplast. This component is very important, because it determines the behavior of the solution and the mixture’s need for the volume of mixing water.

You must understand that any recipes are given for guidance only. To achieve success, you will have to experiment with the ratio of components and test the resulting solutions in operation. And only after the mixture is ideal for your finishing conditions, you can mix large volumes. Special attention Pay attention to the water absorption capacity of thermal insulation components. They actively retain moisture, which, if there is a lack of mixing water, can interfere with the hardening technology of the cement mixture.

In conclusion

If you do not perceive warm plaster as the only solution for insulating a residential building, but only as an opportunity to bring the thermal characteristics of the building to the required values, then the result will not be long in coming. Using such a solution, you can simultaneously level the base and give it new properties. And don’t be afraid to experiment with making your own plaster – it will cost less than buying ready-made mixtures!

Warm plaster appeared on the sales market not so long ago. But for some jobs it will simply not be replaceable.

Today we will look at warm plasters, you will learn their use and instructions on the rules of application will be given. Also in the video in this article you can see the range of products offered and you will be able to make the right choice.

Types of material

Types of warm plaster are divided according to the options for using the components.

By looking we can see the following:

The basis of one of the types of warm plaster is expanded vermiculite, which is a mineral additive obtained as a result of special heat treatment of rock of volcanic origin. Vermiculite fillers have antiseptic properties and can be used both outdoors and indoors.
The basis of the following type of heat-insulating plaster is paper, sawdust, clay and cement. This composition does not allow it to be used outside buildings, but is excellent for indoor use.

In construction, two main methods of insulating the outer walls of buildings are used - erecting false walls with further filling of the resulting space with insulation or gluing the outer surface with foam sheets. Thanks to simplicity installation work and low cost, such insulation methods attract attention. When for some reason it is impossible to use such thermal insulation options, use warm plaster for outdoor work. On construction market Such material appeared relatively recently, but due to its high cost it has not yet become widespread.

Types of warm plaster and its composition

The finishing material is made on the basis of cement, and as a filler Most often, foam granules, expanded clay chips, crushed pumice or perlite sand are used.
The most universal type is plaster with filler and from expanded vermiculite, obtained during heat treatment of the rock of the same name. Warm plaster is a good option for exterior work; masonry can be done with your own hands. Material with mineral filler can be used for interior and exterior finishing work, in addition, it has a pronounced antiseptic effect.
Sawdust plaster consists of clay, sawdust, paper fragments and cement. Thanks to this composition, the material is suitable for finishing external surfaces. If sawdust plaster used for interior work and applied to concrete or wooden walls, then during the drying of the plastered surfaces it is necessary to carry out timely ventilation - this will help to avoid the formation of fungi and mold. It should be noted that the period completely dry walls can last up to 2 weeks.

For interior decoration, the most suitable and reliable type of building material is considered to be plaster, which includes polystyrene foam, lime, cement and other components. This is the most common version of the finishing material, so it is worthwhile to dwell in more detail on the description of its characteristics. However, it is worth remembering that doing warm plaster for exterior work with your own hands requires a clear command of the technology.

Using warm plaster

This material is used not only for exterior finishing, but also for thermal insulation:
gender and interfloor ceilings;
window and door slopes;
building basement;
cold and hot water;
for clogging the joints of ceilings and walls;
giving internal walls soundproofing;
to increase the thermal insulation of walls built using today's popular well masonry technology.

Comparison of the material with traditional insulation

First of all, you should pay attention to the effectiveness of applying a layer of material to the facade of the building. For clarity, let’s make a comparison with a surface insulated with sheets of foam plastic or mineral wool, followed by applying a layer of plaster on top of them. The comparison will be carried out in three directions: density, degree of moisture absorption and flammability.
During the analysis it was found that warm plaster is 10 times heavier other thermal insulation materials, this means that due to the weight of the walls, you will have to take care of laying a more reliable foundation.

To obtain heat saving indicators similar to those provided by polystyrene foam or mineral insulation, a layer of warm plaster will have to be applied 1.5-2 times denser. Based on the calculations made, it was established that the layer thickness should be 100-200 mm, with a recommended maximum of 50 mm. It is not difficult to guess that you will have to apply plaster to the external and internal surfaces of the walls. In the future, the walls will need to be treated primer and decorative putty. This warm plaster for DIY exterior work has a number of distinctive properties.
Following are the main advantages of warm plaster:
option of applying to uneven surfaces;
high speed of plastering walls;
possibility of application without the use of reinforcing mesh;
good adhesion (compared to other finishing materials);
absence of metal components that can become “cold bridges”;
impossibility of damage to the surface by rodents after finishing.

Material application method

The technology for performing finishing work using warm plaster is not very different from the method of applying conventional plaster.
First of all, you need clean the surface walls from debris and dust, treat it with deeply penetrating impregnations. In addition, experts recommend using a special plaster mesh. The wall surface should be well moistened before applying a layer of warm plaster.
Typically, the entire package of dry mixture is used for preparation, but it is important to note that the prepared solution should be used within 2 hours. You can apply the composition mechanized way or manually. If, when turning over, the composition scooped up with a trowel holds well, then the warm plaster for exterior work has a good consistency and is ready for use.
Since the composition is applied in layers, you will need the most simple tools:
spatula;
trowel;
grater.
The thickness of each layer should not exceed 20 mm. It is important to apply the next layer after the previous one has completely dried, that is, after approximately 4-5 hours. Duration drying period depends on air humidity and temperature environment, so it may take a little longer. The mixture is applied to the wall with a spatula, using smooth movements from bottom to top. If you apply too much plaster to the surface, it will begin to slide.

Time will help ensure the quality of the work. After a few weeks, you need to inspect the surface of the walls and, if mistakes were made, they will appear in the form of swellings, cracks and geometry changes premises, which is checked using a building level or plumb line. At the same time, by 1 linear meter Horizontal and vertical deviation is permissible no more than 3 mm.
Due to the fact that the thickness of the layer of warm plaster does not exceed 50 mm, and the surface does not have fiber, the statement about soundproofing properties material. Moreover, the finishing material does not have elasticity, which will be sufficient to dampen pops, sharp sounds and knocks.

Many people today wonder what warm plaster is and what purposes it is suitable for. this material and how to work with it. Let's start with the fact that in the domestic market of construction and finishing materials This product is not that long ago.

So, warm plaster is a mixture made on the basis of the simplest cement. But, unlike usual cement mortar, no sand is added to the composition. Instead other ingredients are used:

Expanded clay chips;
Perlite sand;
Expanded polystyrene granules;
Powder made from pumice, etc.

What types of warm plaster are there?

If you are interested in what warm plaster is, you should keep in mind that it can be different. There are many types, now we will talk about most popular of them.

Among all the varieties of warm plaster, one can note the composition, which contains expanded vermiculite. Expanded vermiculite is a mineral lightweight aggregate that is obtained through the heat treatment that vermiculite is subjected to. rock. If you need warm plaster for exterior work, it’s time to pay attention to just such products. And if you don’t want to look for other worthy options, other uses of the material are also possible. For example, this warm plaster is also suitable for interior work. Quite decent, versatile building material. Among the advantages of vermiculite are excellent antiseptic properties.
If we consider popular types of warm plaster, we cannot ignore the “sawdust mixture”. This substance contains sawdust, as well as particles of clay, cement, and even paper. That is why it is not recommended to use warm sawdust plaster for exterior work. On the contrary, the mixture is most often purchased specifically as a warm plaster for interior work - any specialist will confirm this.

Sawdust plaster is an ideal product for covering brick (concrete) and wooden surfaces. It is recommended that the room be regularly ventilated while the sawdust plaster is drying. It takes approximately two weeks for the composition to dry. If the doors and windows are closed in the room, mold and mildew may appear on the surface - be sure to take this into account.

People who want to buy warm plaster always pay attention to a type of material that contains expanded polystyrene foam granules. This plaster contains not only polystyrene foam - here you will also find cement, various fillers and additives, and lime. You need warm plaster for the facade - this option is well suited, however, it is also often used for indoor work.

Since it is the last version of plaster (with polystyrene foam granules in the composition) that is the most common (which cannot be said about other types), we will consider it in detail within the framework of this material. All comparisons with other materials will also be made specifically for this type.

Warm plaster and its areas of application

Let's look at the industries where this material is used today. Anyway, manufacturers recommend following:

Finishing of facades and their thermal insulation;
Soundproofing of internal and external walls on existing buildings, as well as additional insulation;
Insulation of walls if well masonry is used;
Insulation of slopes of door and window blocks in those places where they are adjacent to the walls;
Insulation of cold and hot water supply risers, sewer risers;
For internal finishing works(as a sound insulator and insulation);
Warm plaster is recommended to be used for insulating ceilings and floors.

External finishing of the facade with warm plaster

Let's talk in more detail about How effective is the material? when performing external finishing of house facades.

Warm plaster for the facade will be heavier than all other possible types - up to ten times or more. Consequently, such a wall most likely requires a more solid foundation;
If it is assumed that the facade insulation structure will have a plaster layer over the insulation, the thickness of the insulation usually varies from 50 to 100 mm (depending on the thickness load-bearing wall, desired temperature inside and climate zone). If you pay attention to what the thermal conductivity coefficient is, then everything is clear - in order to achieve similar indicators, the layer of warm plaster should be one and a half to two times thicker.

In other words, a layer of warm plaster will have to be made 100-200 mm thick, but the maximum allowed application is only 50 mm - otherwise there will be dumps. Therefore, warm plaster for the facade should be applied on both sides of the wall at once.

Now, based on all of the above, let's consider everything advantages and disadvantages of the material:

Pros

It is applied very quickly (even one plasterer can apply 110-170 sq.m. in a day);
Can be applied without using reinforcing mesh (in places where there are no cracks or corners);
There is no need to level the walls if you are going to apply warm plaster;
The material has excellent stickiness (adhesion) to all other wall materials;
When arranging this insulation there is no metal bonds, accordingly, you don’t have to worry about cold bridges;
Rodents will never settle in a wall that is insulated with warm plaster;

For more information about the advantages of warm plaster (including for insulating facades), watch the video material. Perhaps you will get answers to everything exciting questions after watching.

Disadvantages of warm plaster

The composition is not a finishing coating - not only a primer, but also a decorative layer of plaster should be applied to the surface of warm plaster;
The required layer of insulation is thicker than when insulating with polystyrene foam or cotton wool (approximately one and a half to two times).

Based on all of the above, let’s talk about where it’s really worth using “warm” plaster.

When sealing various joints, cracks in the walls, floors of the house;
As additional insulation, but this is only for internal work - that is, you will need warm internal plaster (in a situation where work cannot be done outside - when, for example, there is already an expensive cladding that will definitely deteriorate during disassembly);
Warm plaster is often used to insulate the base;
When finishing window slopes the material is also often used.

Applying warm plaster - technology

Before work, prepare the wall surface in the same way as before applying simple plaster to cement based. That is, all dust is removed, as well as the remains of other solutions. If necessary, the surface is treated with special deep-penetrating impregnations, or simply strengthened with a plaster mesh.

It is important that the surface of the wall, which will be insulated with warm plaster, is thoroughly moistened with water before starting all work.

When the composition is prepared for use, the entire package is poured into a container (its volume must be at least 50 liters);
Next, add water in the amount indicated on the packaging of warm plaster;
Everything is thoroughly mixed using a mixer;
The resulting mixture must be used within 120 minutes from the moment of preparation.

How to check whether the required consistency has been obtained or not? It's simple here:

Scoop up the solution using a trowel and turn it over;
If the mortar holds well on the trowel and does not fall off, it means that the plaster is completely ready for use;
Ready-made plaster can be applied either by machine or by hand.

To avoid any difficulties when applying warm plaster, pay attention to the video: applying warm plaster. The lesson will be useful for both specialists and novice renovators.

What they look like subsequent work:

The plaster mixture is applied using ordinary plastering tools (trowel, spatula, float, etc.) in several layers;
The thickness of one layer should not be more than 2 cm;
Each subsequent layer should be applied no earlier than 4 hours after the previous one was applied;
If on the street high level humidity, and the air temperature is lowered (especially in the autumn season), the drying time of the layer increases;
It is customary to apply the solution only to the surface that has been leveled and primed;
Apply warm plaster with a wide spatula, this is done strictly from the bottom up;
It is impossible to apply a thick layer of plaster at a time - this may simply cause the mortar to slip;
Check and acceptance plastering works usually carried out about three to four weeks after all the work has been done.

Common mistakes when applying warm plaster

It is not difficult to guess that during such work certain mistakes are often made - especially when the work is performed by novice specialists or simply amateurs. Consider this moment in more detail:

If peeling is observed, it means you made some mistake during work;
If the applied composition begins to crack;
If the geometry of the room changes due to the fact that the layer of warm plaster is too thick.

How to check the “geometric” quality of the plastering work that you have completed? This work requires a plumb line, as well as a two-meter rule, and a bubble level. Everything is checked simply: a two-meter rule is applied to the surface (as a rule, an aluminum strip is used as such a tool). If gaps are detected, it means that there are irregularities in the geometry.

It is important that deviations from the horizontal (or vertical) of the plastered surface are not more than 3 mm per meter.

About material consumption

What can we say about material consumption? Everything is here quite understandable:

For each square meter the surface takes from 10 to 14 kg, if the desired layer thickness is 25 mm;
If the desired layer thickness is 50 mm, then the consumption is 18-25 kg per square meter;
1 square meter of wall insulation with warm plaster will cost you $40 (the information will be useful for those who want to buy such plaster) - with a layer thickness of 25 mm;
If you turn to specialists to do the work, you will have to pay up to $15 or more for each square meter.

To insulate “airborne noise” using warm plaster (this could be noise from a TV, conversations, the sound of a car engine), the material must have a fibrous structure. In addition, it must be ventilated. The effective thickness here starts from 0.5 cm;
To insulate “impact noise” - knocks, falling objects, sounds of footsteps, the material must have elasticity (like rubber).

Warm plaster does not meet either the first or the second requirement, so all data on excellent sound insulation performance is most likely slightly overestimated.

For some work, warm plaster (facade, interior decoration) is indeed often used and this is quite justified. But its use is not always advisable - in many cases you can limit yourself to completely different materials or insulation and get either the same or a more impressive result.

Be sure to take this into account when finishing or renovating to protect yourself from unpleasant surprises in the future.