Prior to the start of the floor repair, you need to correctly perform the procedure for preparing its surface. The main task in this case is the accurate selection and competent implementation of the type of base for finishing material. The fundamental difference will consist of which material is made of the foundation. It can be wooden, slab or concrete. In each of these cases, you need to act in your own specific way. To prepare a wooden surface, you must first make sure that it is in good condition. The flooring of wood is checked for the presence of traces of decay and cracks. If the areas affected by the fungus are noticed, then they need to replace the boards in them. True, provided that the damage is non -critical, sometimes it is enough to only clean the traces of the fungus. Cracks can be stuck with a home -made putty. It is prepared from materials such as carpentry glue and sawdust. After refueling the primer with such a composition, you need to wait for the moment when its drying occurs, and then bring the surface in this place to an even state using sandpaper. The slab screed is performed using materials such as fiberboard and chipboard. The second version of the plates has more significant strength, so it suits better. If such a screed has already been laid earlier, then it should be certified that there are no significant height changes in all its area. If they are located, then the corresponding section of the screed should be dismantled and a certain amount of expanded clay under the plate of chipboard. It will not only smooth out the level of base, but also increase the thermal insulation characteristics of the floor. The most universal option for the foundation for laying flooring is a concrete screed. It is most durable, but is still equipped with significant difficulty. The old screed should be studied for the presence of defects. If they are present, it is best to replace the base. To do this, the entire previously flooded concrete layer must be eliminated, and then a new screed is equipped. Today, not only the cement-sand mixture, but also special types of aligning materials began to be used for its implementation. Although they cost a little more than cement and sand, the effect of their use is the highest quality. But still, to save money, you can try to act in the old fashioned way.