Repair floor

The technology of semi-floor screed: pros are two ways to perform

The technology of semi-floor screed

Uneven floors can spoil the appearance of anyinterior. On this floor is impossible to lay any flooring or laminate. The flooring is not only hide the irregularities, but also spoil faster. Therefore, the first step in the repair of any premises should be screed: semi-dry, dry or wet. It all depends on the time in which you have to invest, the effort and expense for which you will have to decide.


  • Characteristics of moist alignment
  • When used semi-dry floor screed?
  • What materials are needed?
  • Preparation of solution for alignment
  • Semi-dry screed: process technology
    • Option 1 - "Semi-dry floor screed"
    • Variant 2: a reinforcement

Characteristics of moist alignment

Semi-dry screed - a leveling floorsby using a semi-dry hard cement-sand mortar, the strength of which is provided by a metal mesh, or the addition of polypropylene fibers. This kind of ties by maturity is a cross between a wet and dry screed. If dry screed start further work can be immediately when wet - 2-4 weeks (28 days), then the semi - after 4 days.


Fiberglass: 10 sq. meters of space it will require 0.27 kg

This semi-dry floor screed has a number ofadvantages. When used in the course are inexpensive, but quality materials. After the cement-sand layer is applied, aligned and polished rule, he did not require additional treatment: either dub or moisturize it, as is done in liquid screed cement-sand mortar, it is not necessary. This gives a solid monolithic flat base under the floor, which is not afraid of cracking and shrinkage.

When mounting the semi-ties do not needworry that the fluid will leak out of solution and leaks to the ground floor. Semi-dry screed with fiberglass is not only durable and resistant to mechanical stress, but also has the acoustic and thermal insulation characteristics. Mounting such a coupler can be performed using mechanized means, which greatly facilitates the process.

When used semi-dry floor screed?

  • limited repair time;
  • thin slab and the likelihood of fluid flow on the lower floors.

Semi-dry floor screed is applied on such a framework:

  • hardwood floors (in the old-style houses);
  • concrete floors (modern high-rise buildings);
  • compacted sand or gravel-sandy soil (basements, detached house, ground floor).

What materials are needed?

Semi-dry floor screed madesand-cement mortar. To ensure the strength and solidity of the screed using a reinforced metal mesh that is filled poluzastyvshim solution, or simply added to fibrovolokno solution. Polypropylene fiber prevents the formation of cracks. For semi-dry floor screed with addition of fiberglass will need these materials:

  • bead tape penoizol (poliizol, izolon);
  • sifted sand;
  • cement;
  • fibrovolokno;
  • water.
Using the grid antisettling

Using the grid antisettling

Antisettling steel mesh reduces cracking, and cracking in case holds a monolithic material. For semi-dry cement-sand screed on the grid based on need:

  • Tape for edges;
  • antisettling mesh and wire;
  • sand;
  • cement;
  • water;
  • hardeners and modifiers.

To carry out semi-floating screed on the basis of which provides additional thermal insulation, and even use such materials:

  • tile adhesive or Self leveling solution - for smoothing of large irregularities;
  • surfaced roll material (as an option - roofing with bitumen processing) - for waterproofing;
  • expanded polystyrene, extruded polystyrene or mineral wool - for warmth.

Preparation of solution for alignment

Mixing cement-sand mortar on the floor

Mixing cement-sand mortar on the floor

To prepare the solution usingfiberglass in Pneumosupercharger poured 120 liters of sand, 150 g fiberglass, 50 kg of cement. Consumption of fiber per room 20 sq m area. - 0.54 kg. Everything is mixed for 3 minutes and then water is added, the solution was further mixed and fed through a hose at the place where the tie will be carried out.

Mechanized feeding from Pneumosupercharger solution

Mechanized feeding from Pneumosupercharger solution

When used for reinforcement meshpreparation of the solution, take 1 part Portland cement, 400 and 3 parts of the sifted sand. The mixture can be prepared on the spot of laying the screed, even without the use of mixers. First poured sand then cement. The dry mixture was slowly added water. With it, the main thing is not to overdo it. The solution should be plastic. If you take it in hand, it will be easy to form. But the water to drain from it should not be.

Also, when mixing add impact modifier thatIt makes the tie more ductile and resistant to temperature increase (important for laying underfloor heating). The solution was thoroughly mixed and then applied to a substrate. In addition to conventional solution using sand concrete and other ready-made dry mix for a floor covering, which diluted with water according to the instructions for use. The coupler solution is added to the hardening accelerators plasticizing materials, reinforcing fibers and light fillers, such as foam or expanded clay aggregates. A thorough kneading of the solution - a guarantee of quality for future ties. Tools that are useful for semi-dry floor screed:

  • Pneumosupercharger with a hose;
  • concrete mixer;
  • Sander;
  • level;
  • beacons;
  • termorezka;
  • trowel;
  • rule (2-3 m);
  • plate tamper for tamping;
  • putty knife;
  • polyurethane or wooden float.

Semi-dry screed: process technology

Option 1 - "Semi-dry floor screed"

  • Cleaning of premises

As with any screed, you first need to prepare the ground. To do this, clean the remnants of old floors, sweep away any debris and examine the rest of the surface.

  • Primer base

If the presence of deep pits, sharp ridges betweenplates, they cover a primer or a special adhesive. It is important that if flaws remained, they were significantly smoothed. Priming also prevents the absorption of moisture base.

  • Laying damper tape

Using the edge tape is especially important wheninstallation of underfloor heating. Because temperature affects the future quality of the floor. Tape or buy ready-made or cut into strips big roll polyethylene foam. It will provide sound insulation and safety screed.

  • Laying solution

After preparation of the solution (as is done,described above), the first layer stack. Its thickness - okolo20 mm. The first layer of the solution is well tamped, after which the reinforcing mesh is placed. Between a mesh pieces connect pieces of wire or welded. Top still poured and tamped 3-4 smpolusuhogo solution. If the added solution fibrovolokno, additional reinforcement in the form of a net is no longer required.

  • Alignment surface
Floor Leveling on beacons profile

Floor Leveling on beacons profile

In order to achieve a perfectly flat surfaceworks on leveling the cast solution. A laser level is determined based on the differential. An important stage of the work is to install beacons. This may be the profiles for gypsum board, which is placed in a solution, and then dub them rule the surface and remove excess material. To install the beacons of the profiles, the entire surface of rascherchivayut lines.

The distance between them should not exceed the lengthrules by which the floor is to be leveled. Along the lines of the solution are poured a heap, and which fit the profile. On the edge profiles established rule that is pulled in the direction of the profiles. Excess material is removed, and deepening a little loose and re-added to the solution. In the profiles using the rules and removed all unnecessary.

  • Grout solution

To overwrite the semi-solutionuse a grater. When the solution hardens several profiles are removed, but traces of them immediately filled with a solution and polished. Use this sander.

  • Care screed

After the screed is laid, it should coverfilm, so it does not dry out too quickly. For cement stone maturation need to provide moisture conditions during the day at a thickness styazhki5 see in 4 days can be placed decorative floor covering:. From linoleum to wood flooring and vinyl tiles. After this tie any material runs out perfectly aligned on the floor.

Variant 2: a reinforcement

This method is called "semi-floating screed" is performed using a conventional solution and metal mesh laid on the insulating material layer.

  • Cleaning of premises

The first stage - cleaning from the base to tie all garbage, including the remnants of the old floor.

  • Smoothing irregularities

When you see the quality of the floor, then, if desired,You can pour some glue bulges and bumps. It is important that there was no sharp transitions, depressions, bumps. Bulge knock or brushes, moistened with water, after which the applied solution or paste. With no need to rush the application of self-leveling, otherwise all the liquid drained in one place and the effect will be the opposite. To smooth out irregularities using: TekhnoNIKOL, Bikrost, linokrom.

  • Soundproofing

Around the perimeter of the room lay the tapepolyethylene foam (also suitable izolon). Krepjat skirting tape with liquid nails, double-sided tape or silicone. The bands should be slightly wider than the thickness of a future tie. Excess can be trimmed. The resulting edge will be the layer between the wall and the screed, provide sound insulation, cushioning and durability.

  • Waterproofing and insulation

To prevent the ingress of moisture in bathrooms orareas of the first floor, all seams are hermetically glued, and then using a fusing producing web material. Rolls preheated to the substrate and fusing the bottom edge of the wall, the strips are glued to each other. A cheaper option to use roofing with bitumen impregnation.

  • Floating screed

The next step - laying insulation layer. Before that you need using the laser level Gaugeable entire area and to determine the irregularities make appropriate marks on the walls. In places the presence of deep recesses need to build an additional layer of polystyrene foam. To adjust the thickness of the polystyrene by the necessary use termorezku. She cut the necessary thickness of the layers of foam.

  • Installation beacons

On the leveled floor surface screwed beacons. In this case - for wood screws. They are easy to screw and adjust the height. This method is suitable for the foam, as it is light and loosely lying on the floor and in all movements straying from their seats. When laying the polystyrene layer will need to make holes in the sheets, so that they are formed as well in places with beacons. The sheets should be packed very tightly, without unnecessary gaps. If there is a need to lay wires or communication, the foam is easy for it to cut the necessary holes - slots. When laying the pipe turn izolona and wires are placed in corrugated stainless steel or plastic. When laying the slabs of expanded polystyrene leave unencumbered path between them. This is done in order to not have to mark time on the fragile plates from foam.

  • Laying a layer of mortar and mesh

The solution in the tank or kneaded usingmixer construction or on the floor. The finished mixture is semi-dry with a spade scatter layer B2 smpo entire room surface. Next fit the grid. If it consists of several pieces, they are fixed to each other by a wire. Above is poured and leveled new layer of mortar. It needs to be carefully trample down. Next - with alignment rules and level. If irregularities are formed, the places fill up the solution. To make it better grappled with the previous layer, the lower layer of slightly loosened.

  • Grout

The penultimate stage will be smoothing and polishing. This achieve a perfectly smooth surface. When the screed has hardened, a metal spatula knock mounds and place of their education levels. To this wetted surface of the solidified spray, spread on top of the solution from the sand and cement (1: 1), triturated polyurethane or wood rasp. After leveling the surface once again checked by the rules and level. Next beacons are removed, and the places where they have been established, further overwritten. Grinding surface grinding machine.

Grinding screed

Grinding screed

Semi-dry screed has the strength anddurability through the use of fiberglass reinforcing mesh or additives. In order to insulate the floor at the same time, use technology, "floating screed" with the laying of the thermal insulation layer. Providing structural strength, tight deadlines floor ready for further use, a variety of methods and means - it is different from other types of semi-dry screed.

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