Alignment is one of the most basic steps in installing a floor. For this, a wet screed is traditionally used. But in some cases, the most rational solution is the use of a dry mixture. This is not only a simpler, but faster way.
Dry backfill for the floor
More recently, expanded clay was the most popular material for backfill, which is characterized by a low level of thermal conductivity and low cost. But at the same time, it also has drawbacks: a large height of the backfill layer, difficulties with compaction of the surface, etc. In addition, expanded clay sand is not suitable for laying prefabricated floors, because it settles over time. This violates the overall level of coverage, since its elements for this reason deteriorate. Knauf high-tech products that replaced claydite were able to solve this problem.
Dry filling Compavit
Dry backfill (production of the Republic of Belarus) is an effective insulation for prefabricated floors. It is used to level the surface. This material differs from ordinary expanded clay in structure. Crushing is not used here, due to which there are a number of unique characteristics:
- round shape of granules;
- grading;
- specific fraction and density.
The material is packed in paper or polypropylene bags of 40 liters.
Advantages of using Compavit backfill
This screed in the construction industry began to be used relatively recently, but has already gained considerable popularity among specialists and home craftsmen.
Among the main advantages of the dry floor system are the following:
- Efficiency of laying - an average of 8 hours, a team of 2 people stacks 50-60 square meters. m cover.
- You can install the finish layer immediately after the device dry screed.
- Due to its light weight, minimal loads on the floors and foundation are created.
- The dry Compavit backfill and prefabricated floor structures make it a perfect foundation. It can withstand point loads weighing 360 kg / m 2 and operational on the floor - up to 1 t / m 2 .
- Dry screed is used in the arrangement of heated floors, including on existing wooden foundations.
- The absence of dirt from mortars and cement dust, a long drying process are important arguments for any owners.
- During the entire period of operation, faults and creaks of the floor are excluded.
- Due to the good sound and heat insulation characteristics of the fill layer, there is no need to use additional materials that provide low thermal conductivity and absorb noise.
- Compavit backfill is a hypoallergenic and safe product for human health.
- The low price allows you to use it for processing bases of a large area. You can buy material inexpensively in bulk from the manufacturer or in Leroy. Backfill Compavit costs an average of 250 rubles. per bag. Given all the advantages of the material, it is not at all expensive.

Application area
Backfill Compavit is widely used in new buildings. It is used for the following purposes:
- floor leveling;
- sound insulation enhancement;
- reduction of the probability of deformation during shrinkage of the building.
Compavit backfill is the optimal solution for private construction, since the supporting structure, foundation and wooden floors due to the low bulk density of the material experience minimal loads in this case.
It also allows for repair work in residential premises during their operation. During reconstruction, floors can be freed from furniture gradually. In this case, it is permissible not to remove the old flooring, which avoids the problems associated with the disposal of dismantled materials.
How to work with Compavit
The procedure is as follows:
- First of all, prepare the base. To do this, it is cleaned of residual dirt and dust. After that, the estimated level of the future floor is noted on the surface of the walls.
- They cover the base with plastic wrap, glue along the perimeter the joints with the walls with an edge tape.
- A filling layer, the thickness of which is 2-5 cm, is distributed and carefully leveled. To get one centimeter of the layer per square meter, you need 10 liters of dry material. The required thickness of the backfill is determined on the basis of what quality of the surface of the base, what are the height differences and their number. Also affected by the availability of utilities and other equipment, their features. It is important to remember that the minimum thickness of the backfill layer is 2 cm.
- If the dry screed device is manufactured in a room with high humidity, it is recommended that the upper part of the backfill layer be treated with a hydrophobic compound.
- Carefully level the filler layer and begin the installation of floor elements.
Adequate price ensures the popularity of the material. And the good quality of Compavit granular backfill guarantees a long service life of the rough and fair floors.