- 1 The number of screeds in a warm floor
- 2 How to install a screed for underfloor heating
- 3 Underfloor heating screed pouring and temperature joints
- 4 How to make a temperature joint
- 5 Concrete grades that are better to use for screed
- 6 Screed thickness for underfloor heating
- 7 The main points to be observed when screeding
Gradually, warm floors are increasingly replacing conventional heating systems. In addition, we can confidently say that such floors themselves become traditional, the more so, the laying of a warm floor with their own hands, not such a costly and time-consuming task. Manufacturers who are engaged in the production of elements for the warm floor, constantly increasing and improving their offer due to the increase in consumer demand. Moreover, the average buyer who plans to make a heating installation under a warm floor, it is difficult to independently navigate in such a variety. But no matter what the consumer would settle on, eventually, it will be necessary to understand the definition of such a concept as, screed for underfloor heating.
The number of screeds in a warm floor
- Screed. This screed is the base on which the insulation is installed. As a rule, such screed is poured on the initially prepared ground. The floor slab can also be used as the ground.
- Clean screed. This screed is poured directly on the heating pipes. An important point is that by performing this screed with your own hands, you can put only when you make sure that the pipes are under pressure.
How to install a screed for underfloor heating
The screed for underfloor heating is installed in stages. The stages of screed installation are as follows:
- After installing the rough screed, it is necessary to make the laying of insulation, which should be made fixed with glue or adhesive tape.
- After that, a metal mesh is laid. It serves as a reinforcing material, as well as a marker for laying pipes, cables.
- At the third stage, it is necessary to make the laying of elements of heating systems. For this purpose it is useful damping tape. It serves as a device for leveling. Also, the tape is an excellent soundproofing and thermal insulation element.
- After that, the installation of all the elements of floor heating, which are connected to the main heat carrier.
- In the fifth and final step is the final screed under the underfloor heating. After it dries, it will be possible to lay the final floor coating.
Underfloor heating screed pouring and temperature joints
Such joints are necessary when the room has a large area of screed (about 40 square meters), and only when finishing screed. For reinsurance, expansion joints can be made every 20 square meters. Also temperature seams will prevent the screed from cracking during heating. The rough screed is not heated, because between it and the floor heating pipe is laid insulation, acting as a preparatory heating.
How to make a temperature joint
The pipe passes through the material of the joint. The material itself acts as a damping tape. In the place where pipes pass through the material, they are encased in a corrugation. It is better to take a corrugation one size larger than the metal pipe.
Concrete grades that are better to use for screed
Screed for a warm floor is made of concrete. The main characteristic of the concrete screed is density. The density depends on the brand of concrete, and for warm floors, experts recommend concrete grade 150-300. Concrete grade 150 is best suited under the screed for residential construction, and concrete grade 300 for industrial buildings. Additives for concrete will also be required, but if the concrete is of excellent quality, you can do without them. Additives will improve the quality of the screed, as well as increase the quality of the floor heating and its performance. The speed of heating the room will increase, which will reduce energy consumption by many times. You can also add plasticizer to the concrete. During the heating and cooling of the floor, it will serve as a protective element against cracking. Table of concrete grades (Concrete grades and composition) The screed for a warm water floor is laid with the help of concrete on the basis of sift. As it serves as a fine-grained crushed stone, mixed with sand. Heat transfer in such a pouring is better, and the screed itself is stronger.
Screed thickness for underfloor heating
The thickness of the rough screed is usually 5 centimeters. The thickness of the final screed can range from 5 to 10 centimeters, depending on the purpose of the room. For industrial facilities, it is best to do screed thickness of 10 centimeters. It should be remembered that with a thinner screed, the boiler will work longer, due to the fact that the accumulation of heat, which should be stored in the floor space, will disappear faster. The optimal thickness of the floor screed will be the thickness of 7 to 8 centimeters.
The main points to be observed when screeding
- When pouring screed with his own hands it is necessary to pay attention to the air temperature. Do screed at subzero temperatures, even with the use of additives – you can not!
- Before pouring the screed also need to set the pressure in the pipes. It must be about 1.5 – 2 atmospheres. It is not recommended to heat the coolant above the temperature of 25C. This prohibition applies until the complete drying of the concrete, which will take about 20 days.
- The screed is made after the plastering works
- It is necessary to use damping (expansion joint) tape, its thickness is from 3 to 10 mm, which should be glued to the lower part of the wall
- With the help of special metal “screeds” it is necessary to set the level of the future floor
- It is necessary to properly prepare the future mixture of concrete
- In rooms with large areas, it is necessary to make temperature seams, as well as such joints are recommended to make a safety net to prevent the floor from cracking