When repairing the floor in apartments, often faced with the issue of its curvature. To eliminate this, it is necessary to make a screed, i.e. the alignment of the floor surface with the help of various materials. To understand what method for the floor is better, consider the main types and in what cases they are appropriate:
Why do you need a floor screed?
- for leveling the substrate for subsequent finishing;
- for installation of underfloor heating;
- for obtaining the same level of base in all rooms in the building;
- in cases where it is necessary to raise the level of the flooring.
Wet floor screed
The basis of this method is to obtain a liquid solution of concrete or cement, which is poured on the floor surface itself. It spreads well over the plane, filling all the irregularities and creates an even base. To begin with, the floor is rolled around with rollers, so that no air bubbles are formed, and after drying, it is evened out with a trowel. The main disadvantage of such a coating is a long drying time, two months according to the technology. In turn, the wet screed is divided:
- knitted – is performed on top of floor slabs.
- with a waterproof layer – suitable for those rooms where there is high humidity and possible contact of the floor with water (bathroom, kitchen);
- with a thermal insulation layer – designed for better heat exchange, protects the room from the cold air from below (basement, unheated rooms);
- with the subsequent application of the filler – designed for subsequent installation of laminate or linoleum. These types of coatings requires a particularly flat surface, so on top of a wet screed, pour the self-levelling mixture.
Contains in its composition plasticizers and fiberglass. Such mixtures have high elasticity and strength, low moisture content, dry within 12 hours, and after 4 days you can put the floor covering. In turn, it is divided into concrete and cement. The main difference between them is that concrete is lighter and best suited for floors with a high slope. The main advantages:
- the use of a minimum amount of water, accelerated drying time. When pouring the base by this method eliminates the possibility of flooding the neighbors;
- does not require subsequent alignment of the surface;
- the minimum possibility of formation of cracks, as it does not give the shrinkage;
- creates additional heat and sound insulation.
- requires additional equipment for mixing, because of the low flowability;
- it is necessary to avoid getting moisture in the ready mix. If it is applied to wet cement, it will cause cracks.
- due to improper laying techniques, it does not compact sufficiently and cracks or creaking may occur.
Dry method of leveling the floor
The basis of this method is that the existing floor surface is covered with polyethylene, the top is poured loose mixture (claydite, expanded or quartz sand), which serves as insulation and level the base, and then laid gypsum-fiber panels, sometimes OSB, plywood or chipboard.If the base is flat, then instead of dry backfill can be used extruded polystyrene boards. The main advantages:
- of all three types is the most economical;
- fast installation time;
- no dirt during repair work;
- provides good sound and heat insulation;
- suitable for any flooring;
- when used in old buildings, with wooden ceilings, significantly reduces the load on the supporting base.
- afraid of moisture, in the case of a leak can begin to rot;
- not recommended for installation in poorly heated rooms.
In order for the new flooring to last a long time, you should properly make a screed, and what kind is better depends on the room, available materials, what coating you will do and on your financial capabilities.