What is the layer of concrete on a warm floor

Types of screeds for underfloor heating and the technology of their arrangement

Stretch under a warm water floor is a simple cement pouring. It is called roughing and is made to level the surface, prevent heat loss, sagging pipes. In addition, it affects the durability of the finishing layer, which is poured on top of the heating system. It can be laid in three ways. Let’s talk about them first.

Choose the optimal thickness of the floor screed

The screed is called the upper part of the floor structure, which serves as the basis for laying decorative floor coverings. Modern repairs, carried out both in a new building, and in the apartments of old high-rise buildings, necessarily includes work on filling the floor with screed. In order to independently engage in the arrangement of the floors, you need to know what materials will be required and what the thickness of the floor screed for your apartment will be optimal. The nature of the work will largely depend on the characteristics of the room and the desired characteristics of the future floor.

About minimum thicknesses

According to the norms SNIP, the coating layer over the tubes should be at least 20 mm. This is true if a cement-sand mixture or screed mortar composition with similar characteristics is used. For a cement-based filler floor, it is recommended to increase the layer of covering laying by 5-10 mm to compensate for shrinkage.

Since the standard diameter of the tubes is 20-25 mm, it becomes clear which thickness of the screed for a warm water floor is the minimum. This is 45 mm without taking into account the waterproofing, thermal insulation, as well as the underlayment for laying the system. This figure corresponds to the recommended thickness for cement-sand and similar mixtures, so the screed of a warm water floor can be made independently according to the standard technique.

In practice, in calculating the repair work is assumed that the device will raise the level of the floor covering at 70-100 mm. This thickness includes:

  • waterproofing;
  • insulation layer;
  • Thermal insulator required in the heating structure;
  • substrate for easy routing of the contours;
  • The main floor screed with the pipes of the system located in it.

If the base for laying the whole floor structure (e.g. concrete slab) is flat, a total thickness of 70 mm is optimal. Installing a water-heated floor using compositions of the cement group will not exceed the weight of the coating recommended for most buildings.

In houses where the quality of the base is not optimal, it may be necessary to rough level the surface. For this purpose, the bottom roughing layer is poured separately. In this case the total thickness of the floor increases, as does its weight. Houses with reinforced concrete slabs rarely have problems with mass. However, it is recommended to use lightweight technology or self-leveling fillers when making a screed over a water heated floor.

The optimum thickness of the screed for a warm waterborne floor. All the rules and regulations

Many residents in private homes as primary or supplementary heating make a warm water floor. Even a bathhouse is no exception, for example, here. It has a lot of advantages, the main ones being:

Balanced, that is, the optimal distribution of temperature across the height of the room;

Tactile comfort (it is when it is pleasant to walk barefoot, and it is also possible to sit and even lie down);

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And here you go, one of the important questions what is the thickness of the screed for underfloor heating. Let’s talk about exactly that. Let’s go.

Work on weak floors

The task of forming a coating with as little weight as possible is in houses with ceilings of metal or wooden beams. Solves the problem with semi-dry or dry screeds of different classes. The overall list of works may look like this:

  • construction debris, which filled the space between the beams, is removed;
  • expanded clay or polymer granules are poured into the voids;
  • A layer of board or plywood is sewn;
  • a waterproofing agent is laid;
  • the screed of the rough alignment is made.

What is a dry screed and dry screed is in our materials.

In order not to create excessive pressure on the overlap, for the levelling layer under the screed of the warm floor are used construction mixes based on perlite. They are light enough to form a durable coating.

Tips for pouring

To pour the screed on the system of water underfloor heating, you should follow the recommendations of experts with experience in this type of work. First of all, this applies to the brand of cement, which in the optimal mode will be equal to M200-M300. Various additives in the mortar composition will not be superfluous, in order to improve the quality of the pouring. The plasticizer allows the mixture to spread perfectly over the entire surface, and as a result avoid the appearance of cracks and other defects.

After the filling must be sustained time until the complete drying of the solution. During this period, you can not turn on the water heated floor, as it will have a negative impact on the drying process and the quality of the screed. To get a strong base, you should care for the screed after the filling. This consists of maintaining optimum temperature conditions, avoiding drafts, as well as wetting the surface for almost a week.

Do not heat the “warm” floor, to speed up the drying process. If you have limited time, it is better to use other options for the arrangement of the floor foundation, such as self-levelling compounds, where the drying out takes about 9-11 days. At the time of installation screed ambient temperature should not fall below 10. Otherwise, you will not get a positive result.

Do not forget not only about the damping tape, which serves as a compensator for thermal expansion of the screed, but also about all the other layers that will create a reliable structure over the water heated floor system. Before you start pouring, you should take steps to test the system for proper operation and tightness of all connections. Otherwise, difficulties may arise after the inclusion in the screed.

The thickness of the underfloor heating. A detailed breakdown of the height of each element.

If you are reading this article, you are probably thinking about installing a water heated floor in your home. You are now looking for information on what thickness of water underfloor heating is necessary for a warm floor in your home.

In fact, you are probably interested in one of two questions:

Let’s look at each question individually. Let’s introduce the concept not the thickness of the water underfloor heating, and the pie of the water underfloor heating.

A water heated floor pie is all layers of water heat connected together. It looks something like this:

The floor heating pie or so-called thickness consists of the following elements:

How to Insulate a floor to prevent Cold from below with EcoTec FloorFoam

    , which is installed along the edge of the walls and serves to compensate for the expansion of the concrete screed. Its height is 15-20 cm from the screed. Its thickness is not taken into account used more often in the form of polystyrene. It serves to cut off the lower layers from the heating of the underfloor heating. Thus you save on the flow of the coolant and underfloor heating works as it should. The thickness of polystyrene on the first floor in cold regions should be 10 cm. In regions with a temperate climate, a thickness of 5 cm will do. Still, it is better to overdo it than underdo it. Therefore we recommend a thickness of 10 cm.

  • Polyethylene. It is mounted on the thermal insulation to create an additional greenhouse effect. The thickness of it in a general measure we will not take into account.
  • Mac grid. It is mounted on the thermal insulation and serves as a convenient way for laying pipes on it. Its thickness is 4 mm ideally Our main carrier of heat. The height of the 16th pipe is about 2 cm.
  • Concrete screed. Today, manufacturers recommend for pouring a concrete mixture of grade M-300. From my practice I recommend M-200, 250, 300. The thickness of the water floor screed is 5 cm from the top of the pipe! Exactly how much is needed for the proper operation of the water heated floor.
  • Finish coating. Parquet or tile. As a basis take a thickness of 2 cm.
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About the thickness of the screed in general terms

There is no universal answer to the question of the optimum thickness of the screed layer. This point largely depends on the following indicators:

  • type of soil, in the case of installation of water heated floor in a private home when pouring a general concrete layer;
  • peculiarities of the configuration of the room;
  • the purpose of the room to be arranged.

The above items are basic. There are a number of other nuances, such as the type of cement or self-leveling mix, the characteristics of reinforcing bars and mesh, etc.д.

The type and thickness of the screed depends on many factors

Conventionally we can distinguish 3 main varieties of screed water heated floor. Information in the table.

Table. Types screed for a water heated floor

IndexValuesNotes
Minimum thickness Approx. 2 cm It is equipped with ready samovyravivayuschih mixtures. Reinforcing is not done.
Average thickness On the order of 7 cm A reinforcing mesh or thin reinforcing rods are used.
Maximum thickness On the order of 15-17 cm Monolithic system with reinforcement. It is used in case of arrangement of integral support system, which is a part of the house foundation and the floor at the same time.
layer, concrete, warm, floor

The thickness of the layer is also affected by the characteristics of the materials that make up the mixture. For example, the thickness of the screed with crushed stone can not meet the above minimum rates, t.к. The fraction of the elements makes it impossible.

In addition, there is a wide range of readymade self-leveling mixtures on sale, the technology of arrangement of which does not require casting a too thick layer of. Such compositions are used for leveling the surface directly before laying the finishing material.

Self-leveling flooring is perfectly compatible with water underfloor heating pipes

In general, the layer should be of such a thickness that the heating elements are completely covered by the filler. Given that the maximum diameter of the pipes from which the system is going to warm the floor, less than 2.5 cm, we can say that the screed thickness of the order of 5-7 cm in most cases will be enough.

However, along with the above information, it should be borne in mind that when using the system in question, heat is released, under the influence of which the concrete part of the “pie”, and with it, and the finish coating will expand. It is necessary to make the screed of such a thickness that the material of the finish coating was subjected to temperature deformations to the least extent, but, at the same time, retained optimal rates of thermal conductivity.

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It is necessary to make the screed of such a thickness that the material of the final coating was subjected to temperature deformations to the least extent, but, at the same time, retained the optimal thermal conductivity

layer, concrete, warm, floor

Too thick screed over a water heated floor experts do not recommend pouring. It is meant that there should be no more than 4-5 cm of concrete mixture above the pipes. It is important to understand: the thicker the poured, the more energy will be expended by the system, and the harder it will be for the user to control the intensity of heating.

How to pour a concrete screed

Choosing the type of screed for the filling is not enough, you also need to know how to properly perform this filling. Any error in the manufacture of such a coating reduces the effectiveness of underfloor heating, leads to the destruction of the screed. Prior to the pouring stage, work must be done to prepare the base, laying waterproofing and a reinforcing layer, and installing the heating system. Damper tape is also fastened around the perimeter of the room prior to the installation of underfloor heating. And only after that you can proceed to the manufacture of screed.

  • metal profile for guides;
  • dry plaster;
  • a container for mixing mortar;
  • level;
  • trowel;
  • a rule.

With the help of a level gauge on the wall mark the line of screed pouring. Please note that the thickness of mortar over pipes should not be less than 3 cm.

Mix gypsum mortar and use a trowel to spread it in small piles along one of the walls at a distance of 20 cm. Lay the rails on the mortar and set them on the level. Between the screeds leave a distance of 1.5-1.8 m. As the plaster dries very quickly, you should not spread the mortar for the beams immediately over the entire area, do it in 2-3 steps.

Prepare the concrete solution: mix dry components in the right proportions, pour in water, add a plasticizer.

The mortar is poured between the guides and using the rule distribute over the surface

When pouring the floor pressure in the pipes must be equal to 0.3 MPa, otherwise you can not lay the screed. The mortar is poured between the rails and distributed over the surface with the help of a rule. Work very carefully to avoid stepping on the pipe. Pouring is done in portions, dividing the room into several sections. If the floor area is more than 40 m2. Between the sections lay damping tape thickness of 5-10 mm. It is best to use a special intercontour tape, which has a T-shaped profile. It has standard parameters: width 10 cm, height 10 cm and thickness 1 cm. The tape is available in 2 m lengths and is very inexpensive. It is much more convenient to install than ordinary tape. Expansion joints prevent the screed from cracking due to temperature expansion. Pipes that pass through the joints must be additionally covered with corrugated tape.

Pictured. Expansion joint and corrugated pipe joint

When the entire floor has been poured, cover the screed with polyethylene and leave it to dry. After a day, remove the screed and fill in the gaps with mortar. Cover again with foil, and then periodically moisten the floor with water to prevent cracks from appearing. Once the screed is strong enough and the humidity level is lowered to 5-7%, the final floor can be laid.

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