Ways to restore damaged floor screed

Over time, the floors in the apartments bend, crack, wear out. All sorts of factors stop the tenants in time to eliminate a small defect, which can, then, increase to large cracks and chips. Therefore, before you make repairs in the room or lay a new floor, you need to inspect the condition of the floor surface, and in case of damage, repair the screed.

The structure of the flooring.

The standard floor in apartments mainly consists of the following layers:
- reinforced concrete base (plate);
- the waterproofing layer (bitumen, roofing material);
- noise-insulating layer (expanded clay, granulated slag);
- screed (cement, cement-lime);
- flooring (linoleum, tile).
Ways to restore floor screed

All significant changes that occur in the layers affect the condition of the screed.
Consider, by way of example, possible causes leading to the occurrence of a certain type of defect.

The causes of damage to the screed.

Each damage has a specific cause. There are the following defects:
1. Abrasion of the surface.
It occurs in floors cast from low-quality materials. The top layer is always covered with cement dust.
Ways to restore floor screed

2. Cracks and potholes.
Formed during the deflection of the main plate, the destruction of the insulating layer, insufficient thickness (less than 30 mm), when laying cement-sand mortar on an improperly prepared base, the absence of expansion joints.
Ways to restore floor screed

Ways to restore floor screed

3. Stratification.
Appears if the filling of the general layer was carried out in several stages, while the surface was poorly cleaned.
Ways to restore floor screed

4. Porous structure.
Present in those floors that were filled with a solution with impaired density.
Ways to restore the screed depends on the type of defect. The most common damages include cracks, chips, delaminations and hidden voids. If the structure of the floor is violated by more than 30%, it must be re-cast, with smaller values ​​it is restored.

Repair cracks.

Using a chisel and a hammer, deepen and widen the crack. Using a construction vacuum cleaner or water-soaked broom, remove the generated debris and dust.A clean surface is plentifully moistened with a solution made of epoxy primer and solvent in a ratio of 1: 10. In this way, good adhesion is ensured between the damaged base and the applied element. After the primer dries, the mortar is laid in the treated gap with a spatula and leveled over the floor relief.

Repair of moving parts of the screed.

Several near-placed deep cracks can form a free segment, which will stagger, fall through in the whole canvas of the floor. Such sites are not filled with solution from above, but are dismantled and restored.
Procedure for repairing the damage:
- chisel and hammer, gently, around the entire perimeter of the movable element, the edges are cleaved, for free dismantling of the coating;
- when a piece is removed, large rubbish is removed from the cleared opening and dust is removed;
- for strong adhesion of a new solution with an old one, at the bottom or in the middle of a defective place, a reinforcing layer is fastened, which may consist of a metal lattice, rods, etc .;
- re-clean the place of dust;
- several times covered with a primer (the recipe is described above);
- produce a fill with a cement-sand mortar in a ratio of 1 to 3;
- surface level and smooth down with a spatula on the floor level;
- for hardening the top layer, a fresh, leveled solution is coated with a thin layer of cement.
Elimination of the bundle.
If the thickness of the waste layer is small, it is dismantled, the surface is cleaned, primed and coated flush with the floor with a self-leveling mixture. If the delamination has penetrated deeply, then the sizes of the occurrence of the defect are determined, they are cut down and the same operations are performed as in the repair of moving parts.
Elimination of voids.
When the deflection of the main plate occurs, the aging of the thermal insulation layer or mistakes are made when installing the floor, voids appear under the screed. They contribute to the appearance of such a defect as cracks. To eliminate emptiness:
- hammer or metal rod, with a blunt tip, knock the surface to determine the location of the void;
- pencil outlines the contours of the identified defect;
- holes are drilled at the planned points with a diameter of 16 mm at a distance of 200 mm from each other;
- with the help of a building syringe, gradually fill the voids with a repair filler of reduced viscosity;
- after injection close up repair hole.
When drilling holes in the screed, remember that you need to do this carefully, just as the electrical cables are placed underneath.
Ways to restore floor screed

Surface hardening.
Due to daily loads, poor-quality materials, the screed is thinned and covered with dust, even if it is under the floor covering. To prevent dusting of the surface, special reinforcement impregnations are used. They are applied with a roller, on a perfectly clean base. They are selected depending on the loads that act on the floor.
Base leveling.
To lay a floor covering such as a laminate, the screed should have slight differences in height. But in fact, few owners can boast of the evenness of their sexes. The photo shows an example of a typical, for apartments, deflection.
Ways to restore floor screed

It can be easily eliminated if you use a self-leveling mixture.
Fill order:
- qualitatively clean the surface from dust;
- wash the floor with soda solution no less than 2 times;
- moisturize;
- the mixture is applied in small portions and evenly smoothed;
- using a needle roller, in the composition reduces the concentration of air bubbles.
The floor can be leveled with OSB sheets from a thickness of 12 mm. For this:
- clear the basis of garbage, an old floor layer, dust;
- the middle of the trough is leveled with sand;
- OSB sheets are laid close together and fixed to the floor, leaving a gap of 10 mm between the wall and the slab, along the entire perimeter;
- differences, between sheets, grind or close DVP.

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