Heat-insulating plaster for internal works. Advantages of thermal insulation plaster. Its types, features of implementation. Reinforcement works

Warm plaster for interior work is a very unusual and new building and finishing material for many, which has appeared relatively recently on the domestic market. Accordingly, it is quite natural to consider the question of what kind of building mixtures - warm plasters - and how to use them.

Composition of warm plaster

Warm plaster for interior work is a dry mix based on ordinary cement. The difference from the classic solution is the absence of sand in the composition. It can be replaced by any other components:

• Perlite sand.
• Expanded clay crumb.
• Powder derived from pumice.
• Styrofoam granules and other materials.

Varieties of warm plaster

There are several varieties of warm plaster. Building mixtures differ in composition, scope, application method and technical and operational characteristics.

The following three are among the most popular.

Warm plaster with expanded vermiculite

Expanded vermiculite is a light mineral aggregate obtained by heat treatment of vermiculite rock. Warm plaster with the addition of such a component is used mainly for outdoor work. Despite this, it can also be used for interior decoration - it is a universal building material. Among the advantages of vermiculite warm plaster are excellent antiseptic properties.

sawdust plaster

Warm plaster for interior work, which is especially popular and not intended for exterior decoration - the so-called sawdust mixture. It consists of sawdust, particles of cement, clay and often paper. Actually, it is for this reason that it is not used for outdoor work.

This mixture is ideal for application to wood and brick surfaces. The applied layers of plaster should dry out only if the room is well ventilated. Complete drying takes about two weeks. In a closed room, fungus and mold can develop on the surface of the plaster.

Styrofoam granules plaster

Another good type of plaster is a mixture with the addition. Its composition, in addition, includes cement, lime, various additives and aggregates. It is mainly used for exterior finishing work, but it can also be used for interior.

Styrofoam granular plaster is the most common, unlike the other two types.

Scope of warm plaster

To date, dry mixes of this type are used in the following areas:

• Building decoration and thermal insulation.
• Additional insulation and sound insulation of external and internal walls of buildings.
• When using well masonry - wall insulation.
• Insulation of sewer drains, risers of hot and cold water supply.
• Insulation of window blocks and slopes in places where they fit to the walls.
• As a heat-insulating and sound-proofing material for interior finishing work.
• Experts advise using warm plaster as a material for insulating floors and ceilings.

Benefits of warm plaster

• Quick application of plaster - in a day of work, you can cover a surface of 110-170 square meters. m.
• Does not require the use of reinforcing mesh.
• There is no need to level the walls if warm plaster is used for interior work.
• The mixture has excellent adhesion to all types of surfaces.
• There is no risk of occurrence because there are no metallic bonds.

disadvantages

• The mixture does not belong to the category of finishing coatings and requires the application of not only a primer, but also a layer of decorative plaster.
• Unlike wool or polystyrene, the thickness of insulation with a warm composition is several times greater.
• Plaster is not quite economically consumed - the price for it, by the way, is not so low.

Where should you use warm plaster?

Based on all the pros and cons of this dry mix, it is best to use it in the following works:

• Sealing of joints and cracks in ceilings and walls of buildings.
• For internal work in case of additional insulation, for example, when it is impossible to carry out insulation procedures outside the building, a cladding is installed, which will deteriorate during disassembly.
• Window trim.
• Basement insulation.

Technology for applying warm plaster

The base before applying this type of dry mix is ​​prepared in the same way as before applying conventional cement-based plaster. Remains of other materials, dust and dirt are carefully removed. If necessary, the surface can be treated with special compounds or a primer in order to strengthen and improve adhesion.

An important requirement is that before starting work on applying plaster, the base must be thoroughly moistened with water.

Sequencing:

1. The dry mixture is poured into a container prepared in advance with a volume of at least 50 liters.
2. Clean water is added in the amount indicated on the plaster package.
3. With the help of a construction mixer, the mass is mixed.
4. The life of the finished mixture is 120 minutes.

It is very simple to check the consistency of the resulting mixture - a small amount of the solution is collected on a trowel, after which the tool is turned over. A well-mixed mixture should not fall off it. Finished plaster can be applied both manually and by machine.

• Warm plaster is applied to the base surface with special construction tools in several layers, and the layer thickness should not exceed 2 cm.
• Each subsequent layer is applied 4 hours after the previous one.
• The drying time of each layer may vary depending on the level of humidity in the air.
• Warm plaster is applied with movements from the bottom up.
• Checking the applied layer is carried out three to four weeks after all work has been completed.
• The full curing of the plaster occurs within one to two months.

Mistakes when applying warm plaster

During interior finishing work using warm plaster, certain mistakes can often be made, especially if they are not handled by specialists. As a result of this, delaminations, cracks may appear or the geometry of the entire room may change due to a too thick applied layer.

The quality is checked quite simply: for this, a rule-rake is applied to the surface. In the presence of gaps between the tool and the wall, there are violations of the geometry.

When applying plaster, the most important thing is to avoid deviations from the vertical or horizontal by more than 3 mm.

Dry mix consumption

Plaster is consumed (the price for it varies between 200-900 rubles per pack), depending on the thickness of the layer: about 10-15 kilograms are spent per square meter of the base.

If the work is done by specialists, you will have to pay about $ 15 for their services, not counting the cost of the materials and tools themselves.

Plaster layer thickness

Depending on the thickness of the walls, the material from which they are made, and the climatic zone in which the building is located, the size of the layer of the finishing composition also varies. According to standard calculations, 51 cm can be insulated by applying a layer of plaster of 8-10 cm on it. Of course, such a consumption of the mixture is simply huge and irrational, so it is best to use it as an additional material. Unlike classic bricks, aerated concrete or ceramic blocks require a much smaller layer of plaster.

The standard material thickness recommended by manufacturers is from 2 to 5 cm. Calculating the required amount of the mixture is quite simple, in addition, it is supplied in separate packages weighing 7-10 kilograms. The standard amount of plaster is usually enough to apply a layer of 2-2.5 cm per square meter of surface.

Plaster "Knauf"

Dry mix "Knauf" is a very expensive finishing material with good heat-insulating and water-repellent properties. Safe insulation, easy to apply on the prepared base. Its advantages include vapor permeability, weather resistance, absolute environmental friendliness and additional surface insulation.

Plaster "Knauf" - the best option for interior finishing work.

Warm plaster for interior work is a relatively young building material that simultaneously performs three functions: it levels and decorates walls, and also ensures a comfortable indoor temperature. Some types of this material also have soundproofing properties.

Most often, heat-insulating plaster for interior work consists of the following substances:

1. Fillers. They can be very diverse: from sawdust to foamed polystyrene.
2. Astringent component. Most often, cement grade 400 or 500 is used. Gypsum and slaked lime are also used, but extremely rarely.
3. Additional components. Used to increase viscosity, plasticity and water repellency.

The composition of warm plaster most often includes cement, additional components and a filler, on which the level of thermal insulation depends

Varieties of material

The main performance characteristics of plaster depend on the type of filler:

• Styrofoam. It has the same level of thermal insulation as foam. In addition, its cost is relatively low. But the material is flammable, and when burned, it releases harmful substances.
• Sawdust. This is the cheapest material that is considered environmentally friendly. The level of thermal insulation is low, but you can use it to make warm plasters yourself.
• Perlite. This material is obtained from a natural substance - volcanic glass. The substance is processed at high temperatures, as a result of which it acquires a porous structure. Perlite is resistant to temperature changes, pathogens, it is easy to process and lay, but at the same time it absorbs moisture well.
• Vermiculite. It is made from mica. The main advantages are fire safety, mechanical strength and biological safety. But just like the previous material, vermiculite has a high level of hygroscopicity.
• Foam glass. It is made from quartz sand. Compared to the above materials, foam glass loses in terms of thermal insulation. But it can be used for finishing wet rooms.

Types of fillers for heat-insulating plaster

Advantages and disadvantages

Insulating plaster has the following positive aspects:

1. High level of thermal insulation. A 5 cm plaster layer has the same thermal insulation index as two rows of bricks.
2. Good level of soundproofing.
3. Fire safety. Most of the materials that are used for insulation are non-flammable. The exception is expanded polystyrene, but it is not very popular.
4. Relatively light weight. This type of finishing material is lighter than most conventional plasters, so there will be no unnecessary impact on the walls and base of the house.
5. Adhesion. Warm plaster mixtures have good adhesion to most building materials.
6. Environmental friendliness. In most cases, substances of natural origin are used for the manufacture of this material.
7. Ease of installation. Such plaster is applied in a thin layer, so the installation of a reinforcing mesh is not required.

The main disadvantage is the fact that warm plaster loses a little to standard heaters in terms of thermal conductivity. In addition, mixtures are quite expensive.

Brief overview of prefabricated plasters

Knauf Grünband. Plasters of this brand are considered the highest quality and most popular in the modern market. This material is made on the basis of cement, and expanded polystyrene with a fraction of about 1.5 mm acts as a filler. In addition, the composition contains additional components that increase the performance of finished coatings. After drying, the plaster is not afraid of water and has a structural coating. The thermal conductivity of the mixture is 0.55 W/m°C. The minimum layer thickness is 10 mm, the maximum is 30 mm. The material can be applied manually or with a machine. Supplied in bags of 25 kg, the average consumption is 12 kg per square meter with a layer of 10 mm.

Knauf Grűnband - warm plaster filled with polystyrene foam

AuBenputzPerlit FS-402. Lightweight plaster based on Portland cement to which perlite is added. The mixture was developed specifically for finishing cellular concrete surfaces, but it can be used on all surfaces, including old plaster. Insulated surfaces do not have the highest thermal conductivity - 0.16 W / m ° C. The filler fraction does not exceed 0.6 mm, resulting in a textured coating that requires further decoration. The maximum layer is 50 mm, and the consumption is 10 kg per square meter with a layer of 10 mm.

AuBenputzPerlit FS-402 - heat-insulating composition with perlite filler

Unis Teplon. Quite a popular material that is intended exclusively for internal surfaces. It is made on the basis of gypsum and perlite. The maximum layer without the use of a reinforcing mesh is 50 mm, with a mesh - 70 mm. After drying, a coating is obtained, which is not necessary to be subjected to further finishing. The mixture comes in two varieties: gray and white. It can be used to prepare the base for wallpaper or paint. The thermal conductivity of the plaster is 0.23 W / m ° C. The material is packaged in bags of 5, 15 and 25 kg, the consumption is 8 kg per square meter.

Unis Teplon - plaster with a gypsum base and perlite filler

De Luxe Teplolux. Warm plaster based on cement with the addition of foam glass with a fraction of 3 mm. After drying, the surface requires further finishing. The recommended layer is 40 mm, it will dry in 28 days. Mixtures are packaged in bags of 12 kg, the consumption is approximately 5 kg per square meter.

De Luxe Teplolux - warm plaster with foam glass filler

Paladium Palaplaster-207. The main advantage of this material is the high level of sound absorption. It is made from cement and foam glass. Typically, plaster is used to create rough surfaces for wallpapering or painting. The solution dries fairly quickly: 2-3 days. The consumption is only 4 kg per square meter, and it is supplied in 12 kg bags.

Paladium Palaplaster-207 - thermal insulation compound filled with foam glass

Umka UB-21 ТМ. This material has been specially developed for cold winter conditions - it withstands 35 freeze / thaw cycles. It is produced on the basis of cement and lime, to which foam glass granules are added. After drying, the plaster requires further finishing. The uniqueness of the material lies in the fact that, provided that a reinforcing mesh is used, the layer of material can reach up to 100 mm. The plaster is supplied in bags of 7 kg, and the consumption is 3.5 kg per square meter.

Umka UB-21 TM - foam glass filled plaster

ThermoUm. Can be used for indoor and outdoor work. The material dries for at least 28 days, after which you can start finishing it. After drying, the coating acquires the ability to absorb moisture accumulated near the wall itself and release it into the air, which ensures a long service life of the surfaces. Mixes are supplied in bags of 7 kg, and the consumption is only 3 kg per square meter.

ThermoUm - warm plaster that has a long service life

On a note! You should not make a conclusion about the purchase of a certain type of plaster, based only on consumption or cost indicators. The lower the consumption, the more expensive each kilogram of dry mix will cost, so it is better to carry out a full calculation in advance and decide on the budget.

How to prepare plaster with your own hands

The prices for ready-made compositions are quite high, and if you look at the cost of individual components, then the idea arises to make a mixture with your own hands. It is only important to remember that inaccuracies in the production process can significantly affect the quality of the finished coating. Do-it-yourself warm plaster is prepared according to several recipes.

The first version of the solution is 1 part of cement, 1 part of ordinary building sand, 4 parts of perlite. All calculations are based on the volume, not the mass of materials. You will also need water, but its exact amount is almost impossible to name. The result should be a mixture with the consistency of thick sour cream. In some cases, the proportions change, for example, 1 part of cement, 1 part of sand and 5 parts of perlite, as well as 1:2:3, respectively. It is also permissible to add PVA glue, but not more than 1% of the total mass of the solution.

Most often, polystyrene foam or perlite is used for home-made warm plaster.

The second option involves the presence of plasticizers. It is possible to insulate with such compositions internal surfaces of any type. For the manufacture of this plaster, the first step is to prepare a special solution. Carboxymethylcellulose, as well as plasticizers, the total amount of which should not exceed 1%, are dissolved in a small amount of water. All this must be thoroughly mixed and let the solution brew. Then 1 part of the solution is mixed with 1 part of cement, 2 parts of perlite and 2 parts of sand are added. Thoroughly mix until a homogeneous material with the consistency of thick sour cream is obtained, after which it must immediately be used for its intended purpose.

Should know! The above recipes are approximate. The exact proportions depend on the quality of the materials used to make the plaster, the accuracy of the measurements, the composition of the water, and so on. In the factory, all this can be controlled, but not at home. Therefore, you need to be prepared for the fact that the ideal formula will have to be derived by trial and error.

Warm plasters are a good option for those who want to abandon the use of standard heaters and at the same time decorate their home. Such compositions are not cheap, but you can save a lot if you cook everything yourself.

Energy-saving technologies in the construction or renovation of houses are becoming increasingly popular. One way to reduce the cost of running a building is to warm plaster with high heat-saving properties.

Types and features of warm plaster

In fact, warm plaster is almost no different from ordinary plaster, with the exception of heat-saving additives. It can be perlite, vermiculite, expanded polystyrene and other components in crushed form. Their low density reduces the mass of supporting structures, which reduces the load on the foundation and ultimately reduces its cost.

• Cement, due to its versatility, are used both for interior decoration and facade insulation.
• Gypsum is mainly used for interiors due to its natural composition and high environmental friendliness.

It is also worth noting that even such plaster cannot replace conventional wall insulation, but in the complex, the heat-retaining performance of the house increases significantly. As a rule, heat-insulating plaster also has sound insulation qualities, which improves its consumer qualities.

Features of the use of warm plaster

Due to its composition, warm plasters are highly hygroscopic and are usually used as interior plasters. The solution can be used in rooms with normal and medium humidity. The basic rule for facade plasters is protection against direct exposure to precipitation and vapor permeability of walls and / or finishing layers applied on top of the plaster.

Buy warm plaster you can in our online store arh-group with delivery in Moscow or the Moscow region.

Warm plaster- this is a group of finishing coatings for exterior and interior work, combining leveling, hydro- and heat-insulating properties.

Composition, brands and GOSTs

The composition of warm plasters can vary due to the heat-insulating filler and the binder base. Loose fillers act as fillers materials with low thermal conductivity: expanded perlite, vermiculite, expanded polystyrene granules, foam glass. Some sources recommend sawdust, but they provide the worst quality coating, are prone to rot and fire, so they are excluded from the review.

There is also a special type of warm plaster used for radiation isolation of medical premises. barite plaster contains crystalline barium sulfate, an X-ray absorbing compound.

Warm plaster for outdoor use it is made on the basis of cement of the M-500 or M-300 brands. With a hydrophobic filler (foam glass, PPS, etc.), such a coating is not afraid of precipitation, temperature changes and ultraviolet radiation. Insulation plaster protects the main layer of thermal insulation from adverse weather conditions.

For interior decoration of premises, mixtures based on lime and gypsum, which are unstable to moisture, are used.

Perlite is presented on the domestic market heat-insulating plaster next trading stamps:

All of them correspond to GOST 31251 as materials with the highest degree of fire safety.

Release form

Ready mixtures are produced in dry form in packages weighing 7-30 kg. Depending on the formulation, they may include superplasticizers that improve the solubility of the cement and increase the plasticity of the solution. At home, such an additive is PVA glue or liquid soap dissolved in water. The consumption of the plasticizer is not more than 1% by weight of the cement in the mixture.

The shelf life of the mixed mixture is 30-90 minutes, so it is important to measure the volume of the prepared solution and the speed of work.

Characteristics

Specifications warm plasters may vary depending on the filler.

Name	Meaning	Comment
Strength kg/cm2		An excellent indicator that allows you to use the mixture to seal gaps between bricks.
Bulk weight kg/m3		For a mixture based on PPS granules.
Shrinkage mm/m	Is absent	After drying does not shrink.
Thermal conductivity W/mK		Inferior to synthetic and mineral heaters by 1.5-2 times, superior to the usual cement-sand mixture by 4-5 times.
Frost resistance, cycles		Average, offset by ease of repair.
Water absorption %		Additional moisture protection required.
Vapor permeability		Maintains an even microclimate in the room, there is no "dew point".
fire resistance		Based on mineral granules - non-combustible coating, based on PPS - low-flammable.
Cost rub./m2		Material consumption is 2-4 kg/m2
Soundproofing	Partial	A high soundproofing effect is given by mixtures with a fibrous filler such as the basalt mixture "Hauncliff".
Toxicity	Is absent	Completely eco-friendly material.
Life time		Depends on the application. The outer coating serves less, the inner one is as durable as possible.

Unique qualities

The main advantage warm plaster is its high plasticity and adhesion (adhesion to the surface). It does not require perfectly even walls and performs an additional cosmetic function when decorating a room.

Allows you to isolate slopes, cracks and internal corners, where the installation of sheet and roll insulation is difficult. Fasteners that act as "cold bridges" for other materials are not needed. Application speed by professional workers reaches 100 m2 in 1 day.

Warm plaster combines environmental friendliness and durability, does not emit volatile compounds and dust.

Minuses

The main disadvantage warm plaster is its raw weight. The plastering process takes place in several stages, it is impossible to apply a thick layer at once. The work is carried out in 3-4 passes, maintaining the previous layers until a strong "seizure".

The thermal insulation qualities of the mixtures are average, and the price exceeds the more energy-efficient PPS. As the main insulation in Russia is not used, its thermal efficiency in our conditions is too low.

Application area

Warming of internal premises, ground finishing of walls. The use of such thermal insulation can reduce heat loss by up to 40%. Recommended material for additional thermal and sound insulation of walls and ceilings, window slopes, pipelines, sealing cracks.

Warm plaster for the facade used as a protective and decorative coating for the main thermal insulation: mineral wool, glass wool, foam plastic, PPS or basalt slabs. It protects the insulation from moisture, weathering, UV exposure and has a beautiful rough texture.

Mounting methods

Instructions for preparing the finished mixture are usually indicated on the package. To prepare the solution at home, the binder component (cement, lime or gypsum), water and loose filler are mixed in a ratio of 1:1:4. The mixture is thoroughly kneaded to the consistency of thick sour cream, after which it can be applied to the cleaned surface.

Plastering of internal walls is carried out by beacons, the thickness of the applied layer warm plaster should not exceed 1 cm in one pass. If it is necessary to increase the thickness of the coating, then the first layer must dry, otherwise the plaster will fall off under its own weight. It is impractical to make a layer thicker than 3 cm, the thermal insulation properties of this are reduced, and the load on the base becomes critical.

Facade insulation plaster applied in a thin layer: 3-4 mm in the first pass, not more than 1.5 cm in general after preliminary application and drying of the reinforcing layer.

Despite the appearance of a sufficient number of gypsum analogues, the cement plaster mixture remains one of the most popular materials for interior and exterior decoration. With a lot of advantages, cement-sand plaster has high thermal conductivity, based on the minimum amount of air pores in the hardened mass. A variety called warm plaster has less thermal conductivity against the background of resistance to cracking, therefore it is considered the best option for those who want to both level the walls and insulate at the same time. Users of the FORUMHOUSE portal actively use plasters with low thermal conductivity and share their experience with everyone.

concept

Typical plaster mixture - cement binder and sand, gives a coating with a density of about 1800 kg / mᶟ and a thermal conductivity of about 1.2 W / (m * C). Warm plaster (TSh) consists of a cement binder and filler, which forms air pores in the monolith, reducing the density and thermal conductivity. If cement is usually used as a binder, then there is a wide choice of fillers:

• Perlite is an obsidian hydroxide formed when lava solidified on the ground comes into contact with water. The nuclei resulting from hydration resemble rounded pearls - pearls, for which the breed got its name. It is characterized by high porosity (up to 40%) and the ability to absorb liquid in quantities exceeding its own weight (up to 400%). For the preparation of plaster, expanded perlite (perlite sand) is usually used - small granules of a white or light gray hue.

• Vermiculite is one of the minerals of the hydromica group, which is small layered flakes of a brownish-golden gamut. Like perlite, when heated, it is able to swell, filling with air. In this form, it is used in various industries, including construction, for the preparation of lightweight concrete and warm plaster mixes.

• Expanded clay chips - made from special varieties of fusible clays, by firing in melting furnaces rotating at a certain angle. This is a fine fraction with a granule size of up to 5 mm, sometimes called expanded clay sand. It is characterized by lightness, airiness, minimal thermal conductivity and a rounded shape of granules.

• Sawdust is a waste of the wood industry; fine fractions are used for plasters, which provide the composition with porosity, but do not violate its structure and maintain mass uniformity.

• PPS - expanded polystyrene granules are used not only for the manufacture of slab or bulk insulation, but also as a binder in ready-made or home-made plaster mixtures. If perlite and vermiculite are natural substances, PPS is the result of the chemical industry and is inferior to natural "colleagues" in terms of durability, biological and fire resistance. However, it copes well with the assigned functions - it makes the plaster porous and reduces its thermal conductivity.

In addition to the binder, filler and liquid, various modifiers are added to the plaster - to increase the elasticity of the mixture, to increase the "operability" period, to prevent the formation of cracks during drying. Manufacturers of dry mixes add various branded water repellents and plasticizers. When making home-made plaster, microfiber, ready-made modifiers sold in hardware stores, various detergents (liquid soap, dishwashing liquids) or PVA glue are introduced.

The coating obtained as a result of applying a warm plaster composition is not inferior to traditional cement-sand analogues in terms of adhesion to the base (it adheres well to the wall) and strength.

It can be applied to any finishing decorative coating. The article will help you choose the right one. At the same time, it has a low thermal conductivity - on average, 0.13 - 0.9 W / (m * C), and a density of 200 to 800 kg / mᶟ (depending on the filler). When using warm plaster, the load on the base is significantly reduced, and it is easier to work with the mortar - for 1 m² of the wall, you will need to “master” at all stages a lower weight of the material.

Private developers use both the most affordable HS - based on sawdust, and perlite or with PPS granules. Vermiculite compositions are rare, due to the high cost of the filler - it is several times more expensive than perlite. And not every craftsman who has chosen a warm variety as a plaster is able to make friends with ready-made mixtures of famous brands. This is explained, again, by the cost - buying a ready-made dry mix will raise the price per square meter by two to three times. If you buy the components separately, these figures are reduced to a level accessible to almost everyone interested. The calculations of our users confirm the theory.

Sector FORUMHOUSE Member

The price of factory warm plaster turns out to be cosmic, in comparison with a home-made mixture. Approximately 25 bags, weighing 23 kg each, go for 1 mᶟ (for example, take BIRSST T-2). It turns out that a cube, or 575 kg, will cost 15,825 rubles. Material consumption: 7 - 8 kg of dry mix per 1 m² - with a mortar layer thickness of 10 mm, with a thickness of 4 cm, we get approximately 19 m², or 833 rubles per square.

How much a square of a home-made mixture will cost is also calculated based on my own experience.

Yura52 Member of FORUMHOUSE

I have a bag of cement, three bags of perlite and a plasticizer for 5 m² of plaster 1.5 cm thick, if C3, then inexpensive. Total, approximately 500 rubles - 100 rubles per square. With an increase in the layer to 3-4 cm, it still turns out much cheaper than the factory one.

In many ways, the choice between a purchased composition and handicraft production depends on the expected scope of work - a room of several tens of squares can be plastered with a factory mixture, the difference is noticeable, but not fundamental. When it comes to hundreds of square meters or tens of cubic meters, the savings cover both the time spent on experiments with proportions and any other costs.

Solution preparation

The typical ratio of cement to perlite varies from 1/3 to 1/7.

Such a large spread is due to the versatility of the mixture - it is used for interior and exterior decoration of a variety of bases. The ability to adhere and other physical and technical characteristics of the surfaces are different, and such parameters as humidity and temperature in each case are different. The skill of the performer also plays a role: if a pro is able to work out almost any batch, then a beginner, faced with a complex consistency, is likely to “lock up” the solution.

In addition to perlite, sand, lime, microfiber can be added to the batch to increase the strength of the resulting surface and reduce the likelihood of cracking. When using a ready-made plasticizer, the proportions are maintained according to the instructions, if PVA is used - for each liter of closing liquid - 50 ml of glue. To prevent the solution from flowing over the surface, its consistency should resemble thick sour cream. It is almost impossible to achieve ideal proportions only on the basis of typical recipes. Adhering to the basic recommendations, you will have to try different “variations on the theme” until the most suitable one for a particular situation is selected.

Motorist believes that to obtain a warm plaster, it is enough to simply replace the proportion of sand, in whole or in part, with perlite. Using the example of his friend, he was convinced of the effectiveness of a solution consisting of a part of cement, two parts of sand and two parts of perlite, a friend did not use foaming agents, the plaster lay down normally and keeps well. The only difference between a regular and a warm solution is that the latter must be kneaded dry, after a few minutes the filler will release the absorbed moisture and the consistency will be “what the doctor ordered”.

Village and people FORUMHOUSE participant

I did plastering 2 years ago, we don’t live in the house yet, nothing cracked, it’s not heated in winter. The ratio of perlite M-75 and cement M 500 by volume was 7:1, plus fiber (about 10-12), plus foaming agent Cemaplast (lime substitute). The fiber was thrown according to the volume according to the instructions, and the cemaplast was proportional to the cement.

Samurai Jack I chose warm plaster, and decided to do it myself, experimentally choosing a composition suitable for my conditions. The ratio of cement and perlite is in the range from 1/4 to 1/8 by volume, slaked lime is required at the rate of 0.5 parts by weight of cement. Also, the addition of polypropylene fiber to the plaster, but only polypropylene, since fiberglass is destroyed in the alkaline environment of cement. As a foaming agent, dishwashing detergents showed themselves well - about 0.1% by weight of cement.

sector In practice, I got the following:

• Perlite - a bag of 60 liters;
• Cement - 19 kg;
• Water - 19 liters;
• Fiber - according to the instructions.

Among the three sold fractions of perlite, Sektor advises taking medium-sized granules (pictured in the center).

The solution is kneaded in a concrete mixer or manually, but using a construction mixer, the dry components are mixed together, the fiber and liquid additives are mixed into the water. The resulting liquid is added to the dry mixture and mixed until smooth. After solidification in the solution, a large number of air pores are formed.

Application

Working with a perlite-based mortar practically does not differ from the DSP plastering technology - the surface is cleaned of dirt and dust, if necessary, primed with deep penetration impregnations, and moistened before applying the mortar. It is not recommended to try to sketch and level cleanly a layer with a thickness of more than 1.5-2 cm in one approach. It is better to divide the process into two stages, first sketching a rough layer, strengthening the beacons along it, and then sketching the finish and align with the beacons.