If you want to build a warm floor, then you will need to hide all its elements before finishing. This can be done using a screed. Naturally, it is advisable for you to learn about some of the nuances of its arrangement. The screed for a heated floor must be made with high quality, otherwise the heating will be uneven and ineffective.
The figure shows the structure of the “pie” of a cable heated floor
A screed is a concrete layer that is applied to the base to level it or hide other elements before finishing. It should be noted that it can be made not only from cement mortar, but also with the help of special mixtures.
The standard “pie” device is as follows:
- Waterproofing layer.
- Thermal insulation.
- Reinforcing mesh.
- Warm floor.
- Screed.
Depending on the design of your heated floor, the design of the “pie” may change. For example, the first layer is applied to the subfloor in order to level it. The next screed is poured onto the insulation. Last layer already installed on a warm floor. It’s not difficult to do the work yourself, you just need to follow the pouring technology.
Types of screeds
There are few of them:
- Wet. It is made on the basis of cement mortar.
- Dry heated floor. This option has become used very often, as it eliminates the appearance of dirt and problems with contacts electric version warm floor. In addition, this option allows you to lay tiles or other finishing material The next day. Naturally, such a screed must be properly arranged.
These options have their advantages and disadvantages. However, you need to choose a screed taking into account the characteristics of the room, the design of the heated floor, as well as the time allotted for repairs. will suit your case, it's up to you to decide.
What should be the thickness of the screed?
The screed under the heated floor must be done correctly. The thickness of the screed is very important parameter. It depends on what finishing materials you choose. If the thickness is taken into account incorrectly, the heating will become uneven and the heating itself will be ineffective.
Screed thickness for electric heated floors So, if you need to level the rough base or eliminate serious horizontal differences on it, the thickness of the screed will be about 5 cm. At the same time, you can lay heat and waterproofing under it. A layer is poured on top of the insulating elements, the thickness of which should be at least 2 cm. In this case, it will be possible to begin installing the heated floor only after 28 days. All manipulations can be done with your own hands.
The thickness of the screed also depends on what kind of mortar you will use. If it contains cement and sand, then in general there should be a layer of 5 cm above the heating structure. If you decide to add a plasticizer to the mixture, the thickness of the screed can be reduced to 2-2.5 cm. However, in this case you will have to use reinforcing mesh or reinforcing compound. Otherwise, the layer thickness will be 3 cm.
If the heating structure is made of pipes, then the height of the “pie” will be about 8.5 cm. This size is unacceptable if the house has low ceilings. In addition, you also need to consider where the apartment is located. If it is located on the lower floor, then the thickness of the “pie” can be 11 centimeters.
Screed thickness for water heated floors If you do not want to make too large a screed, then it makes sense to arrange. In this case, its thickness will not exceed 3 cm. Although, when using special plasticizers, this parameter can be reduced to 2 cm. In this case, overheating of the elements is excluded.
A screed under a warm floor can be built very quickly with your own hands. It is important to prepare and pour the mixture correctly.
Pouring technology
Preparing for work
Before you start pouring it yourself, you need to prepare the room. Please note that the air temperature in the apartment during work should range from + 5 to + 25 degrees Celsius. Naturally, the base must be cleaned of debris and dust. Otherwise, the solution may lie unevenly and have poor adhesion to the surface. Try to eliminate all gaps in the base. If necessary, perform a rough curl of the base.
The solution should be poured only after all the contours of the heated floor have been laid and its performance has been checked.
During preparation, it is necessary to take into account the possibility of expansion of the concrete mixture under the influence of temperature changes. To avoid cracking of the solution after drying, it is necessary to arrange expansion joints. To do this, you can use a special damper tape or rigid insulation, the thickness of which is at least 1 cm. Such an expansion joint should be made to the entire depth of the screed.
The photo shows the installation of damper tape in front of the screed. Expansion joints are also installed in the passages between rooms Pouring a heated floor should only be done after careful preparation of the base. Before using the composition, do not forget to check the system for operability and absence of defects.
What is needed to arrange a screed?
For work you will need the following materials:
- Cement mortar or dry mixture.
- Reinforcing mesh or reinforcing compound.
- Waterproofing.
- Insulation.
- Fastening elements.
- Container for stirring the solution.
- Construction mixer or drill with a special attachment.
- Spatula for leveling the mixture.
- Tiles or other finishing material for finishing surfaces.
The reinforcing mesh should not have too small cells. Tiles under warm floors are used most often. Naturally, it is also necessary to choose this material correctly. You can lay it with your own hands, following the work technology.
Filling Features
A warm screed is installed in several stages:
- Laying waterproofing film, the thickness of which is usually 250 microns. The canvases are laid with an overlap (20 cm) on each other, as well as with an allowance for the wall. Secure all joints with reinforcing tape.
- Installation of insulation. This is also done with your own hands. It is better to use a special material with an aluminum reflector that will direct the heat upward.
- Attaching the damper tape. It is fixed at the edges and also divides a large area into parts.
- Laying the mounting grid. It is on it that the heated floor elements are mounted.
- Installation of level beacons. They will allow you to pour the solution correctly and evenly.
- Preparing and pouring the mixture. The composition must be diluted as indicated in the instructions on the package. Otherwise, it may turn out too liquid or too thick.
- If necessary, the layer can be reinforced with reinforcing mesh. It prevents damage to the screed after drying. A mesh is required if the layer is thick.
- After a day, the dried composition will need to be covered with polyethylene and left for 7 days.
If you are pouring a water heated floor, then there should be pressure in the pipes at this moment.
Within a couple of weeks after pouring the mortar, you will be able to lay the tiles.
If you decide to use a film structure, then using a screed compound is not advisable. Here you should use . The elements are fixed on it. Naturally, the thickness of the layer should be minimal, and the upper part of the film floor should be visible. Next, you can lay the tiles. First you need to wait for the previous layer of glue to dry. This method of installing tiles will avoid peeling flooring.
Technology for laying heating mats for electric heated floors As you can see, a screed for a heated floor is not difficult to make if you follow the technology. You can arrange it with your own hands under tiles or other finishing materials. The main thing is to choose the right composition for pouring the screed, and not to ignore all stages of the work. Leave your opinion on the article in the comments and share your experience of pouring heated floors.
Most often, the technology for installing heated floors involves installing heating circuits made of pipes or electrical cables on top of mounted ones. cement-sand screed. In the installation instructions for underfloor heating systems, the manufacturer, as a rule, avoids this issue. Meanwhile, the construction of a strong and durable base that is exposed to temperature changes is a difficult process and requires compliance certain rules. The purpose of this article is to highlight the question of how to properly make a cement base and what should be the thickness of the heated floor screed.
Purpose of underfloor heating screed
Conventional screeding, performed in almost all premises of residential buildings, has a number of functions:
- creates the most even surface for laying the finishing floor covering;
- enhances the strength and reliability of the building structure as a whole;
- distributes the load from furniture, equipment and household appliances evenly over the entire surface.
In addition to these functions, the screed for heated floors performs additional tasks, and therefore the requirements for its quality are higher. The tasks are:
- serve as a good “intermediary” in the transfer of thermal energy from the pipes to the air environment of the room;
- distribute this heat evenly over the entire area;
- protect the heating circuit from mechanical influences.
At the same time, the screed above the heated floor must serve for a long time and withstand temperature changes without collapsing or damaging the pipes embedded in it. Before carrying out work on pouring the base, you should carefully prepare, and after that, follow the recommendations for hardening the floor. Since the future monolithic slab will be subject to heating, it will expand more than conventional screeds; this must be taken into account during installation.
For reference. The technology of laying a conventional screed on top of a layer of insulation, whose maximum thickness does not exceed 100 mm, it is recommended to provide expansion joint along the entire perimeter of the room up to 5 mm wide.
Preparation: making expansion joints
After laying the heated floor under the screed is completed, you can clearly see all the pitfalls associated with the future coating. For example, when there are 2 heating circuits in a room, then monolithic slabs you need to make two, and be sure to provide an expansion joint between them. Another point: the distribution manifold is probably located in another room, so the underfloor heating pipes leading to it will cross several similar seams. Two or three slabs, although with a slight temperature difference, will expand differently, causing the pipes or cables embedded in them to break. This will affect the longevity of the circuit’s functioning, which means that pipe transitions from one screed to another must be correctly completed.
The figure below shows a diagram of making an expansion joint near the wall throughout the entire thickness of the heated floor:
1 – waterproofing coating; 2 – damper tape with a thickness of 8 to 10 mm; 3 – polyethylene film; 4 – heating circuit pipes; 5 - cement strainer; 6 – insulation with heat-reflecting film; 7 – additional thermal insulation layer (if necessary).
A damper tape with a thickness of at least 10 mm is also placed in the expansion joint between the slabs of individual contours, and a special profile is installed in it to organize the intersection of pipes with this joint. In this case, the pipes must pass through protective cases:
Note. In the case when the screed is being reinforced, meshes with cells 150 x 150 mm are laid on the thermal insulation layer, also taking into account the separation of the coating by an expansion joint.
First of all, you should know that minimum thickness The screed above the water heated floor should be at least 30 mm above the top of the pipe. If we take into account that a pipe with a diameter of 16 mm or electrical cable, then the total thickness of the cement coating will be 50 mm. This layer thickness takes into account the long-term load from light furniture and people, and is also minimal in terms of heat distribution and its transfer into the room.
Interesting to see different photos taken by a thermal imager while the underfloor heating in the infrared range. When the thickness of the screed under a warm floor is minimal, and the pipe laying step is large, you can notice that the surface is heated unevenly:
As a rule, experts recommend keeping the layer thickness to 70 mm, and the thickness of the screed above the heated floor pipes to 50 mm. This is the best option in all respects, since the base can withstand static and dynamic loads from any furniture and household appliances, while ideally distributing heat, as shown in the photo:
At the same time, you should not increase the power of the base too much; if the thickness of the screed above the heated floor exceeds 50 mm, then another drawback of the underfloor heating system will appear - inertia. The stove will take much longer to warm up and cool down, reducing the possibility automatic regulation with the help of remote temperature sensors to almost zero. Again, on concrete floor there will be an increased burden, which should not be allowed.
Note. Some installation instructions indicate a screed height for electric heated floors of 40-50 mm. This is true only for film heaters or thermomats under tiles, the requirements for a conventional cable heating system are the same as for a water heating system.
Construction of the base finishing coat It is produced using an ordinary cement-sand mortar mixed in a ratio of 1:3, and the screed must include a plasticizer. Its quantity per 1 m3 of solution is determined in accordance with the instructions on the packaging. You can take another route - purchase a ready-made mortar for heated floors. The height of the surface when performing work must be controlled using beacons installed in advance. After pouring is completed, the screed requires 28 days to completely harden.
Conclusion
In practice, pouring screed for an underfloor heating system is a scrupulous task and requires some skill and patience. If you don’t have such skills, then the surface will probably not be too smooth and will have to be corrected with an additional leveling layer. Don’t let this bother you, the main thing is to maintain the thickness.
Installing additional or main heating in the form of underfloor heating is becoming the norm. It distributes heat evenly, making the house cozy and comfortable. Technological process laying heated floors allows you to control the zones of greatest and least heating. The owner has a choice where the warm main flow will be concentrated and where it will be inappropriate.
The use of radiators eliminates such preferences; the air is heated unevenly, and the floors remain very cool. Alternative heating in the form of underfloor heating solves all these problems. Moreover, they are nowhere to be seen, they are hidden under the screed, which allows you to not worry about how to hide the batteries. The room has a more attractive appearance, and evenly distributed heat creates comfort. However, laying such a floor has a number of difficulties.
Many people wonder whether pipe laying needs to be filled with cement or not. The best option overlapping the water floor is considered cement-sand mixture both in liquid and semi-dry form.
Water cover height
When planning heating with a warm water floor, you should take into account the rise of the surface by several centimeters. If the coating is installed in an apartment, its thickness has special meaning, this can cause pressure on the slabs. It is advisable to avoid this. In this regard, in multi-storey buildings they prefer to do without concrete screed, special metal constructions for heated floors.
However, this does not mean that the screed will become lower. The base will rise in any case to a height of at least 10 cm in general. In order to correctly determine how much the coating will rise, you should decide on the type of rough screed. That is, how it will be made and from what material. These factors greatly influence the thickness warm covering and its quality.
Types of ties and their thickness
Flooring experts advise using cement-sand mortar for pouring. It will make the base warm, strong and durable. Some nuances should be taken into account when pouring and the method of preparing the solution. Concrete covering made from cement, sand and water. Classical and optimal thickness will be at least 4 cm.
If necessary, the floor and its height can be reduced by adding special materials. One of these is considered a plasticizer. It will reduce the height and make the material more plastic. The use of a plasticizer is recommended by many experts, as it allows cement-sand mortar do not crumble or collapse during drying and further use.
There is one more important point. If the pouring area is large, fiber, basalt or polypropylene should be added to the solution. Fiber improves the quality of the solution, the coating is laid in a more even layer. It is customary to use it instead steel mesh, if we are talking about large areas. The screed will have such characteristics as increased strength and wear resistance.
In the future, the base will not be subject to cracking and delamination. As a result of adding additional materials, the floor thickness may decrease. However, the height of the floor pipe covering will in any case be at least 4 cm.
Today, many people prefer dry mixture for laying screed. It is less problematic to pour than a cement-sand mixture. This installation method has its own characteristics. The semi-dry mixture is considered stronger than ordinary cement. After pouring, the drying period is much shorter, which makes it possible to finish laying heated floors faster.
Experts say that the material does not crumble or collapse under the influence of heat emanating from the pipes. It is easier and more convenient to work with this type of mixture.
Before laying the semi-dry mixture, you should carefully prepare the base. All debris is removed and the foundation is laid. vapor barrier material. If there are deep cracks or depressions, it is recommended to fill them with a viscous cement solution. Roll materials laid with an overlap, it should also overlap the walls. The seams are treated with special tape. The semi-dry mixture is poured onto the finished base.
The mixing proportions that should be used are indicated on the packages of the semi-dry mixture. The consistency of the material should not contain a lot of water. If you squeeze it in your hand, you get a dense lump. Moisture should not flow down your hand. In this way, they check that the ingredients of the mixture are mixed correctly. Very often, fiber fiber is added to the dry mixture to make the coating even more stable. The fiber is well distributed throughout the structure in all directions.
The minimum thickness of the screed will be 4 cm. Its height also depends on the method of laying the pipes themselves and what material they are laid on. The floor and its maximum height can reach 20 cm. If the base for pouring has significant unevenness, the height must be raised significantly. In general, the thickness will be at least 4 cm and no more than 20 cm.
The coating may be destroyed by improper drying methods. Just because you can walk on the floor does not mean the grout is truly dry. A liquid cement-sand mixture 4 cm high takes at least a month to dry. The mixture prepared from dry materials dries within several days, depending on the height of the coating. In order for the material to harden correctly and without cracking, the surface should be moistened with water and covered with film. As a result, the base will not sag, will dry well and will not crack.
The size of the water coating depends on the type of fill and the characteristics of the base. The more significant irregularities on the surface, the higher the structure will be. This happens due to the application of several layers - this is a necessity to achieve the zero level.
Based on experience, experts say that the relative total height of the warm water coating is 10-15 cm, taking into account absolutely all materials used, including the floor covering.
Every builder and finisher should know what thickness of a heated floor is optimal, the fact is that only correct execution such a floor will allow him to work effectively.
The same floor, which is too thick, simply will not be able to perform its functions, since the air in the room will not warm up because of this.
Heated floor installation
In order to have an idea of how thick a warm water floor should be, you need to know its structure. It is the excellent knowledge of the installation technology of such a heating system that allows you to correctly install all systems, as well as adjust the temperature in the room so that the level of comfort in it is optimal. It is worth keeping in mind that the thickness of the insulated coating layer used to make a warm water floor is usually indicated in the instructions for it.
Important! By general rule Warm floors of all types have a layered structure, that is, a kind of “pie” of concrete is formed in the room with a filling in the form of a heating element.
It can be electric or water. As a result, there is an opportunity for additional heating of one or another room under conditions of reliable protection of all elements of the heated floor.
If we take directly all the layers of the heated floor separately, then it consists of:
- insulation;
- polyethylene film;
- reinforcement mesh, which may be missing, but with it the floor will be stronger;
- pipeline;
- concrete screed.
Each layer plays its role, therefore, what thickness of the heated floor pouring should be in a given case can only be found out by adding up the thickness of each layer of such a cake. At the same time, it is always worth remembering that each layer has its own functional purpose For example, insulation allows you to save on heating water, as well as more efficiently distribute heat throughout the building. If you make a mistake with its installation, then it will become very difficult to understand what thickness of a warm water floor will be optimal.
In any case, before starting work, you should consult with a specialist who has experience in carrying out work. The fact is that correct installation the described “pie” is a rather delicate matter, and if it is not done correctly at any stage, you can inadvertently ruin the whole work, and this extra costs time and money. If you do not have a specialist familiar to you, carefully study the instructions for this or that type of data. heating system. This will help you determine what thickness of underfloor heating will be optimal in this particular room.
How to determine the thickness of each layer in the “pie”?
As we have already written, how thick a warm water floor should be can be determined by adding up the thickness of all its layers. First you will need to calculate and perform a rough screed. She gets a job finishing field and is usually tied to the edge of the foundation base or the foundation itself. If the floor is being installed on the ground floor of buildings, then the rough screed will have to be done on the ground or the bonton floor of the first floor.
So, if you are doing work on the floor, then you do not need to prepare for this in any special way, just sweep the floor and wash it off the dirt. In the same case, when there is a soil base, you will have to prepare it especially, namely, level the soil and compact it. It is worth remembering that the soil base is usually made on the basis of a sand-gravel mixture, and therefore it can rightfully be called a “cushion” - it is this that makes up the first layer of the heated floor in this case, which should be taken into account when deciding the issue of How thick should a warm water floor be?
By the way, there are building codes and rules governing the thickness of each layer of a warm water floor. For example, when pouring a rough screed over the described “pillow”, you must proceed from its thickness of approximately 50 mm. At the same time, the thickness of the warm floor will further depend on the material that you chose as insulation.
The fact is that the same polystyrene foam can be different types and varieties, each with its own thickness. As a result, you have the opportunity to choose the “pie” that suits you, taking into account the size of the same doorways. If this is not done, the heated floor will have to be redone, wasting time and money.
To be more specific, how thick polystyrene foam for a heated floor should be, then a slab of this material measuring 100-115 mm is quite suitable. Its minimum thickness should be the same 50 mm. In addition, if you answer another question about what thickness of penofol should be for a warm floor, it will also be necessary to take into account the density of this material. It should be on average 30...35 kg/m3, this will allow you to significantly reduce the level of heat loss passing through the insulation.
Thickness of other underfloor heating elements
After you have laid the insulation, you will need to cover it plastic film 150-200 microns thick. Lay out on top of the spread polyethylene reinforcing mesh from rods with a diameter not thinner than 4 mm. After installing the fittings, it will be necessary to begin laying and assembling the pipeline. Here the thickness of the pipe will be 16 mm, however, if you take a pipe made of polyethylene, its diameter may be smaller.
When deciding how thick to fill the heated floor, you will need to add another 20 mm to the reinforcing mesh, which will cover the pipeline from above. The heated floor installed on top is covered with a screed with a minimum thickness of 50 mm; you can also add about 10 mm to be sure.
This screed has the function of not only the base of the finished floor, but also a heat accumulator. As a result, answering the question of what thickness of a warm water floor is optimal, it is necessary to provide a screed size that would allow the floor to remain as warm as possible long time. In any case, it is not recommended to make it thicker than 80 mm; it is best to use concrete grade M200 and higher.
These are, in principle, all the layers of the “pie” of a layered floor. However, there is still more to do fine coating, consisting of porcelain stoneware, tiles and other floor coverings. Moreover, each material has its own thickness, for example, for tiles you will need 20 mm of free space, and for parquet - 40.
In addition, sometimes the question arises, what is the thickness of drywall for warm lung floor is suitable. The fact is that drywall is very sensitive to wear, so it must be taken with a reserve. It is best to simply ask the store to provide you with this finishing material, indicating that you are going to use it to finish the floor.
Important! It is also worth remembering that all the dimensions given above are not strictly defined and may change in one direction or another.
This is due both to the unevenness of the floor itself and to the features used in the construction of heated floor materials. For example, can be used instead of polystyrene foam mineral wool, having a different thickness.
Calculating the thickness of underfloor heating layers
With the listed numbers on hand, it will be possible to calculate the thickness of the entire floor, but it is worth keeping in mind that the “pie” in any case must have a thickness of at least 140 mm, counting from the top of the base to the surface of the rough screed. It will also be necessary to make adjustments for the thickness of the gravel “pillow” and the overlap of the first floor.
It is worth taking into account the purpose of a particular room, for example, the same screed in residential premises should not exceed 100 mm, as for warehouses, shopping pavilions, as well as car centers, it should not exceed more than 200 mm. If you need to heat an aircraft hangar, you will already need a 300 mm screed.
IN mandatory It will be necessary to check that all underfloor heating systems are covered with concrete during installation. To do this, the minimum thickness of the screed must be 65 mm. It is imperative to remember that a warm water floor screed differs from a conventional screed by the presence of expansion joints in them.
Other points of mandatory inspection of underfloor heating systems before use are:
- checking the functionality before laying the pipeline screed;
- checking the pipeline for hydraulic density;
- checking the heat-reflecting layer placed under the pipeline system in order to avoid losses.
In order for the screed to be of high quality, the choice of materials for it must be made responsibly, only in this case the warm floor will work for a long time and effectively. At the same time, you need not to overdo it with its thickness so that the heat can function normally in the room.
In the case when the described heating system will operate in non-residential premises, need to pay Special attention on the strength of the heated floor covering. For this purpose, it is imperative to carry out the reinforcement procedure. It is the reinforcing mesh that will help you make the floor durable and at the same time highly functional.
Choosing a floor covering
Once the “pie” is formed, all you have to do is finish your floor. To do this, you need to choose the flooring material taking into account its thickness. If you make a mistake, you will have to redo the floor again, since during the work there is a possibility of damaging the screed.
As for the direct choice of the material itself, it is better to select for heated floors those materials that are not afraid of exposure to moisture or temperature. These include ceramic tiles and porcelain stoneware. The use of laminate must be approached with great care, as it tends to deform when exposed to moisture and high temperatures.
Important! When choosing a particular material for flooring, you need to pay special attention to its thickness.
For example, laminate is available in different options, from which you can choose the one that suits your price. As a result, you get the opportunity to meet the thickness requirements of the water floor and at the same time decorate it beautifully.
By the way, some manufacturers produce kits for heated floors with the addition of a ready-made floor covering. As a result, you save time on searching for it, and in this case your floor will form a single, complete complex. In this way, you can achieve very significant savings in your money.
The thickness of the screed for underfloor heating depends on many factors, but it should be the same over the entire surface. The installation of a water floor is carried out in several stages, where the organization of hydro- and thermal insulation, pipes, etc. is mandatory. Final stage work requires special responsibility from repairmen and adherence to technology, because the protection of the heating system and the preparedness of the surface for laying the final work depend on this, decorative covering. Exactly suitable thickness Screeds provide strength and uniform heating of the floor.
General principles for calculating the size of a concrete screed layer
The cement screed, which is located above a warm water floor, is not just a layer of poured mortar. It provides the necessary pressure to the pipes for crimping and their reliable protection from mechanical damage, and also contributes to uniform heating of the floor. During the work process, it is very important to correctly calculate the thickness of the screed for optimal functioning of the entire heating system. What needs to be taken into account during the calculation process?
- The thickness of the screed is determined not by the wishes of the apartment owners, but by many other factors - the structural features of the building. This takes into account thermal power surfaces, floor properties, appearance facing material etc.
- The screed allows heat to be evenly distributed over the floor surface; a layer that is too thick provides greater heat capacity, a thin layer heats up quickly. But in the first case, the surface takes a long time to warm up, and temperature adjustment is difficult. Thin layer guarantees quick heating of the floor, but it is too susceptible to cracking and cannot provide an even heat supply.
- The organization of this heating system involves covering all heating elements. The optimal total thickness is plus or minus 65 mm.
When using pipes of this size, it is possible to allow an increase in the thickness of the finishing screed by another 10 -20 mm. That is, its size should not exceed 60 mm, otherwise the organization of a heated floor system will be impractical in terms of efficiency. A lot of energy will be spent on heating the thick concrete layer.
The thickness of the screed also depends on the purpose of the room. Minimum consumption mortar is required for residential premises, and in trade pavilions, warehouses or automobile centers the thickness concrete surface there should be more above the pipes. This is due to the excessive load on the floor surface, as well as the fact that public spaces do not need the same heat transfer as in the case of residential buildings. The thickest screed - more than 30 mm above the pipeline - is used in aircraft hangars.
What else should be taken into account when calculating the thickness of a concrete screed?
The screed on a warm water floor can be reinforced if you plan to place large items in the room. For example, installing a piano will require placing metal mesh V top layer screeds, which can be located pointwise or over the entire surface. Special solid additives in the form of fractions make it possible to increase the strength of the screed, as well as, which allows you to slightly reduce its thickness. Therefore, with a standard calculation of the screed layer above the pipes in the amount of 40 - 50 mm, when using the above means, you can leave its thickness from 20 - 25 mm. You should not skimp on materials for organizing the final layer of a heated floor - this will subsequently negatively affect its strength and heat transfer of the heating system.