Before starting to lay the flooring, you should prepare the floor. And the life of the flooring will depend on it. The best are the screed and high -quality plywood that will help to serve the floor for a long time. The screed is used when aligning the concrete floor, because the difference in the floors even several millimeters can have a bad effect on the parquet.
Plywood will provide good adhesion of the parquet board with the base.
The screed can be monolithic, that is, it is made on a mounted surface, here it is worth considering the quality of fillers that will provide the connecting effect. But usually sand or gravel is used for this.
Also, many lay the team screed, and they are made at the factory, and they are already acquired as a whole, they are panels that will help to level the surface. By the way, now many began to use concrete rings in construction, they are not very expensive.
Today, expanded clay concrete screed is very often used. This screed is made of concrete and expanded clay. It must be applied to a concrete base, then aligned and for this use leveling mixtures. And to apply this screed, it is necessary to conduct some calculations to find out the maximum height of the floor level.