Concrete floor screed for warm water floor

The floor screed for a warm water floor can be arranged independently. This component of the system is necessary in order to reliably protect the pipes from damage. In addition, the presence of a strong cementitious screed allows you to easily lay the finish coat.

Preparing before installing the screed

The floor screed for the warm water floor should be arranged according to the rules, only in this way will it be possible to achieve the desired effect and durability of the system. As soon as it was possible to assemble the collector, which is part of the floor, it is possible to start preparing the surface. To do this, the ground should be well cleaned of debris, in addition, do not forget that the floor should be checked for flatness. But do not try to make the base perfectly smooth, because this is not required. The need for alignment can arise only when the unevenness of the floor exceeds a few centimeters. Otherwise, different pressure will be applied to the pipes from the screed side, which can cause damage to them.

Preparation

Before laying the floor screed for a warm water floor, it is necessary to prepare the base by using a waterproofing layer. It acts as the first after the leveling screed before filling the main one. Waterproofing prevents the interaction of the underfloor heating system with moisture, which comes, as a rule, from the lower level. Do not forget that you will have to provide compensation for the temperature expansion of the screed, for this you should use a damper tape. It should be laid around the perimeter of the room, fixing it on the adhesive layer. It is necessary to use such a tape, whose width should be approximately 15 cm.

Screed floor for a warm water floor should have in the composition and insulation material, which is not only able to improve the efficiency of the system, but will prevent heat loss. This is possible due to the ability of the heat insulator to direct heated air into the interior space of the room. It is important to choose the right thickness and type of insulation layer, this will be influenced by some factors, among which you can especially highlight the type of finish coat and the location of the room. So, if the room is located above the heated room, it is permissible to use extruded polystyrene foam, whereas its thickness should be from 2 to 5 cm. But if you have to equip the floor in the room that is located on the first floor, and below it there is no room that would Heated, it should be used expanded clay, after the backfilling of which is mounted expanded polystyrene. The thickness of the latter should be 5-10 cm.

Concrete screed for a warm water floor has some features, if such a heating system acts as not the main one, but additional to the radiators. Then in the role of a thermal insulation layer, it is necessary to use only foamed penofol, which fits into one layer. This material is also known as expanded polyethylene.

Necessity of reinforcement

In order to ensure that the screed has the qualities of strength and resistance to various types of damage and impacts, it must be strengthened using the reinforcement cage. As it should be used steel mesh. You need to choose the one whose bars have a width of about 5 mm. Among other things, when equipping the warm floor to the reinforcement casing, pipes are often fastened. This is done as an alternative fastener for these elements. After all, otherwise the pipes will have to be fastened with a specially created fastener.

Features of filling the screed

Pipes will be immersed in the screed, their total length should not be more than 90 m. If it is necessary to work with the overall room, then it is necessary to use two circuits, only in this way it will be possible to obtain a qualitative warm-up. Use in the screed in some cases is recommended corrugated pipe, which is necessary to protect the compression joints from damage.

In addition to the grid, before filling the screed, you can also lay special mats, which are used for fixing pipes. For this, steel profiles are also used. If you decide to use the grid for this, then it is necessary to strengthen it in a free position, use clamps. When deciding on the use of aluminum profiles, it is necessary to fix them to the black coating with dowels. Only after that, you can start installing pipes, which are placed in special sockets. In the case of mats, the fixation is carried out by the bosses, which acts as the most convenient method, however, it will also be much more expensive than the rest. This is due to the fact that it is necessary to use special insulating material.

Recommendations of experts on pouring

The screed for a water-heated floor, the composition of which is described below, should not be made until the system has been checked. To do this, it is necessary to use the crimping method, which is done after laying the contour. This will make it clear if the pipes are intact. This stage takes a period limited to days. The coolant enters the system under pressure, which is equal to 5 atm. If the damage was not noticed, you can proceed to pour the screed. But the working pressure in the pipes must be maintained for this period. Hot water should not be supplied, as this will certainly affect the acceleration of the drying time of the screed. As a result, the screed will not gain its proper strength.

Selection of Finish Material

Floor coverings can be started only after 28 days after pouring the screed. Choosing a variety, you need to take into account the thermal conductivity of the material. The most outstanding indicators are ceramic tiles. It is acceptable to use a wooden solid board or parquet. If you choose a laminate in the role of the finish coat, it is recommended that you buy one that is specifically designed for warm floors. Under it is permissible to equip a thinner screed, but it is worthwhile to apply an additional layer of reinforcing cage based on the grid. Its placement must be made on the contour before the installation of the screed.

Parameters of concrete screed

The minimum screed for a water-heated floor should be determined by several parameters, but it is necessary to try to make it the thinnest. As a rule, its thickness is 40 mm. But you need to take into account that over the surface of the pipe it should rise by 30 mm, but not less. Use in the preparation of mortar is recommended cement, sand and water. The height of the screed for the water-heated floor within these limits will raise the surface, which will reduce the height of the ceilings, which is why it is not worth pouring concrete of a more impressive thickness. This is also due to the fact that the concrete has an impressive weight - 1 m ^{2 is} approximately equal to 300 kg, which is true with a layer thickness of 50 mm.

The screed should not be thick even for the reason that with the increase of this parameter it will be more difficult to bring the system to a stable heating mode from the moment of the beginning of the functioning of the system.

The solution (the screed of a warm water floor requires its mixing) should not turn out to be liquid. It is necessary to prepare such that it was necessary to level it, you should not stack it too thickly because the inertia of the system will be increased.

Finally

In some cases, a dry screed for the water-heated floor is arranged, this allows solving the problem associated with the impossibility of laying the solution because of its significant weight.