2023 Author: Philip Bishop | [email protected]. Last modified: 2023-08-25 07:54
- Concept and necessity
- Requirements for work performance
- Rough fill
- Preparation for pouring underfloor heating
- Mixing the solution
- Thickness selection
- The pouring process and the creation of expansion joints
- Possible mistakes
Any system for floor heating in premises requires attention not only during the installation process, but also when pouring the screed, both before and after work. A special feature is the bay of the warm floor. After all, it is performed several times during the installation of this system, whether it is a water or electric floor heating.
Concept and necessity
A screed is a layer of mortar that is applied on top of the surface. But with regards to the warm floor, then the screed plays different functions each time, depending on the selected layer.
The first layer is carried out on the rough base. It is mainly used to create a flat surface for the subsequent laying of materials. In principle, this layer is suitable for all surfaces that have even minor effects. Instead of a rough layer for insulation, a floor slab or soil prepared according to all the rules can be used.
The second layer is poured over the thermal insulation layer. It will be designed for laying the underfloor heating cable on it. If everything is done according to the instructions and technology, then the installation of the cable floor will be much faster. As a result, the result will please everyone.
All that remains is to “close” the cable warm floor by pouring the warm floor. It will contribute to an even distribution of heat on the floor itself, as well as inside the room. This layer of pouring the underfloor heating screed will subsequently serve as a surface for the flooring of the selected floor covering.
The device of the final layer of the underfloor heating screed can be arranged only if the operability of the entire system has been checked. The pressure in it must be kept at the required level. Otherwise, you will have to remove the screed and see what problems there are in the operation of the warm floor.
Only these points will indicate how to properly fill the warm floor so that it can warm the air in the room from the base to the ceiling. If you move away from technology and try to do everything at your discretion, then over time you will have to dismantle the surface and possibly even elements of the warm floor, electric or water.
Requirements for work performance
There are no regulatory documents for underfloor heating screed, which spell out the exact requirements that apply to it. But there are rules that cannot be deviated from. Among them, the most important requirement is a flat screed surface for the underfloor heating system. But this point can also be attributed to flooring in order to get a positive result. An even floor will serve as a good basis for all subsequent types of work. In addition to the classic floor screed, self-leveling mixtures can be used during installation. Everything will depend on the floor heating system itself, as well as on the installation possibilities.
Another important requirement is the required level of thickness. The screed layer should normally be 30-50 mm. It is these indicators that will allow you to get the floor heating evenly over the entire area. In this case, the strength of the base will be sufficient to withstand external loads.
The optimal screed layer will allow it to dry out equally over the entire area, without cracks and subsidence. If cracks are formed on the surface, then they will cause negative moments, which include:
- Uneven heating of the entire floor, as well as heating a room or, in general, an apartment.
- Separate areas with elevated temperatures will appear. In these places, the heating elements will warm up above the permissible rate, which will lead to reduced service life and failure.
If cracks have already formed, then all measures should be taken to carry out a high-quality repair. An important factor is the time delay until the cement screed is completely dry. Usually this period is up to 30 days. During this time, no work should be carried out, but wait until it is completely dry. It will not be superfluous to get rid of drafts and sunrays at first. The same temperature conditions must be created throughout the room. Some resort to covering the screed with polyethylene film.
Experts recommend plastering the walls, installing windows and other elements of the room before making a rough floor screed. The same applies to the available communications (sewage, electricity, etc.). The fact is that a warm floor can be laid exclusively on a flat base that does not have defects, pebbles, adhesion of mortar. This will only negatively affect the process of his work. If you do the opposite, then it is best to lay a plastic wrap on the surface, which is subsequently removed.
When it comes to insulation under a warm floor, then it should also lie down evenly, without flaws. So you should take all measures to conduct a high-quality preparatory stage, before pouring concrete underfloor heating.
The mortar should not be in the corners of the room, an angle of 90 degrees should always be maintained. Otherwise, it will not work to achieve a snug fit of the insulation.
There are roughness tolerances. They are usually + -5 mm. Otherwise, the pipes may bend during installation, which will lead to the appearance of air pockets. If they are to be overcome, then it is necessary to install a mixing unit with a pump.
Only when all these activities have been carried out can the first layer of the subfloor be poured. As for the solution, everything will depend on which options for pouring the warm floor are selected.
When the draft is poured, you should wait until it dries completely before laying the layer of thermal insulation. But even up to this point, all adhering parts of the solution must be removed from the surface, all debris and even dust must be removed. After that, do not forget to fix the damper tape around the perimeter in the room, which serves as a compensator for the thermal expansion of the floor screed itself.
Next, the insulation is laid, the next filling of the screed is made. This completes the filling of the floor under the warm floor.
Preparation for pouring underfloor heating
When the rough screed is mounted, you can start installing the underfloor heating. To do this, you should choose an electric or water option, which will practically not have any differences in the subsequent execution of the pouring. But not everyone knows how to fill in a warm floor. For this, the established technology should be followed evenly.
When the underfloor heating system is installed. You should check its performance. For this, it is exposed even within 1.5-2.0 atmospheres. It should remain in the process of pouring the screed. But the system should not warm up above 25 degrees.
Mixing the solution
The density of the future screed will depend on the selected cement grade. In this case, it is very important to understand how to fill the pipes of the warm floor. Basically, the recommended concrete grades are 150-300. Everything will depend on the destination, whether it is residential or industrial construction. The composition of concrete can include various additives that give the mortar certain qualities.
There are features of pouring underfloor heating with a solution. A water-heated floor cannot fully work with a cement-sand mortar. Here, we use concrete based on screening, which includes fractions with fine grains together with sand. A ready-made version is purchased, which is used for filling. This is due to the better strength of the concrete, fewer possible cracks and better heat dissipation. The solution for pouring water-heated floors must meet certain requirements.
If screening is used, then 1 portion of cement is poured into 4 portions of it. But sand and gravel has slightly different proportions - 1 to 4, as well as about 3.5 sand. In some cases, you should independently conduct preliminary experiments to create the ideal consistency. Only then can work be carried out on pouring pipes into the floor. It is also worth noting that in the implementation there are ready-made mixtures for the solution, into which it remains only to pour a certain amount of water, looking at the instructions from the manufacturer.
For screed such a floor, instead of a reinforcing element, fiber is usually used, which has better performance and qualities, as well as having a slightly lower cost, if we take into account the consumption of material for each square meter of the room.
The floor screed layer under the warm floor or over it will depend on certain situations. Usually, for a rough version, a thickness of 50 mm will be enough, but a final screed is 50-100 mm. Everything will depend on the purpose for which the premises are used. In residential premises, a thickness of up to 70 mm is chosen, but industrial ones with heavy loads - up to 100 mm.
As for directly pouring a warm floor, then an optimal thickness is needed so that not only it retains heat, but also a certain time. Otherwise, the boiler will have to work more time, waste time and money. Therefore, it should not be too thin. The average indicators of such a screed should be kept in the region of 70-80 mm.
When building or carrying out repair work, you should understand how to properly fill a warm water floor, choosing the optimal layer performance.
The pouring process and the creation of expansion joints
When the underfloor heating system is exposed, you should think about preparing for subsequent pouring. This is why lighthouses are exhibited. For their correct location, a level is used. Usually they are made in the form of mounds of mortar that support the guide at the required level.
After that, you can start pouring the warm floor using the technology. After spreading the concrete over the surface, it must be compacted. For this, a vibrator is used specially designed for such purposes, a rake, hoes or other improvised means. This is done to remove all possible air bubbles from the solution. If they are present, the level of thermal conductivity decreases, and, consequently, the efficiency of the warm floor after pouring the screed will be reduced.
You can do without setting beacons, and use self-leveling mixtures in your work. The entire area of the room is filled at once. When you are not confident in your ability to fill, it is best to seek help from specialists who can complete the work from start to finish.
For large rooms, as well as after pouring just the final version of the underfloor heating screed, expansion joints should be arranged. For insurance purposes, they are also arranged in rooms with an area of up to 20 m 2. The seams prevent cracks in the screed when expanding under the influence of temperature during the heating process. This suggests why there is no need for such a screed for a rough cut. After their installation, you do not have to worry about the quality of the entire screed during operation.
It doesn't matter what is done, whether the floor is filled in front of the underfloor heating, or after the installation of the system. It is very important that the technology and certain rules are followed. In this case, it is very important to fix the damper tape, and make the markings using a special tool.
The screed itself is usually arranged after the indoor plastering work is completed. The process of preparing the solution takes time, but the proportions must be observed without deviations. Otherwise, its quality will be low, and, consequently, all performance characteristics will be reduced to zero.
To start all subsequent actions after pouring the underfloor heating screed, it is necessary to allow time for it to dry completely. Everything will depend on the solution itself, the ingredients and components. The less water, the faster the drying process. But at the same time, it is worth paying attention to the fact that too little water can lead to a poor solution, the cement will not be able to show all its qualities.
After completing all the screed levels, it is not always possible to obtain a flat surface for flooring such as carpet. For this, it is important to know how to pour the screed onto the warm floor. In this case, additional leveling solutions are used, which are poured with a slight layer over the surface. It is such a warm floor that after pouring can be turned on, used for its intended purpose.
Everyone is able to choose which screed to fill in the warm floor. In any case, if the technology is followed, a decent result will be obtained.
Do-it-yourself Water-heated Floor, Technology And Installation Of A Water-heated Floor With Photo Video
Features do-it-yourself installation of a water-heated floor. How to make a water floor yourself. Device and technology of correct styling with photo instructions and recommendations
Optimal distribution of heating on the floor in the apartment for various conditions. Pros and cons of typical schemes, their use for different types of coolant circulation. Heating pipes in the floor: pros and cons, SNIP, pipes in a new building. Helpful video instructions
Features of pouring a concrete screed under a warm water floor system, choosing the optimal screed thickness, careful care at the end of work for the surface under a warm floor
Installation of a water-heated floor in a house, installation features depending on specific conditions, the sequence of installation of a water-type warm floor, choice of materials
Water Pepper (herb) - Properties And Application Of Water Pepper, Water Pepper Tincture, Water Pepper Extract, Water Pepper During Menstruation
Water pepperProperties and application of water pepper, extract and tincture from itTraditional medicines are still very popular. Not surprising, because they are effective and accessible to everyone. For uterine bleeding and hemorrhoids, water pepper infusion has long been used