🏠 Semi-dry floor screed: features and nuances of laying

If repair work life is limited, but I want to create a solid and reliable basis, semi-dry floor screed is able to be a good solution. Used for its creation solution has its own characteristics. We offer to meet with the composition and formation of the intricacies of such a coating.

Specificity and scope of the semi-dry screeds

At the device on the basis of a semi-dry screed via Pneumosupercharger (less often by hand) and the mixture was fed moisturized aligned at predetermined beacons. It can be used when working in new homes and old buildings. It demands at floor apparatus housing stock and on construction sites.

Considering the consistency of the composition, semi-dry screed relevant for floors and inclined surfaces having a complex configuration. Relatively light weight makes it possible to perform operations in buildings with thin overlap.

The mixture composition and the requirements to raw materials

Good thermal, acoustic and waterproofing characteristics of the formed coating due to its composition. To prepare the solution for a semi-dry screed used:

• waterAdministered in a limited number. Ready mixture should look like wet sand. Water should be taken from the potable source;
• cement. M 500 is used with sufficient strength characteristics. Its properties directly from the life of the formed ties depends. When buying, make sure the integrity of the packaging and check the time of manufacture;
• sand. Adding the coarse impurities without soil and clay with a maximum fineness modulus of 2.5;

• softener;
• polypropylene fibrovoloknoPerforming a reinforcing function. Owing to this component increases the strength and elasticity of the composition, reduces the risk of cracking during drying. The finished coating is more resistant to impact and dynamic loading.

Performance characteristics semi-dry screed floor

Semi-dry screed in performance occupies an intermediate position between traditional and dry views. With it possible to eliminate various floor defects, hide supply mains, Improve the sound, heat and waterproofing characteristics base. Ties Strength - 150-250 kg / cm².

Formed layer may be used as the basis for all kinds of decorative covering. Due to the formation of a flat surface, you can eliminate the use of leveling liquid mixtures. Perhaps the device rigid and floating screed.

Attention! To shrink the formed layer is required only 1-1.5 hours (average speed - 0.2 mm / min).

Due to the consistency and the presence of microfiber cracking hardly occurs.

Advantages and disadvantages of semi-dry screed floor

The absence of excess moisture gives a semi-dry screed following advantages:

The disadvantage is:

Comment

Mikhail Starostin

Team leader repair and construction company "Home Premium"

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«Existing weaknesses solution used corrected by introducing a certain amount of plasticizer in the composition and in the corners tamping mass immediately after laying. "

Kinds semi-laying screed

Laying semi-dry screed floor can be done in different ways. Everything depends on the order in which the premises are carried out repair works, and what the result should be the result obtained. We offer to meet with existing types of installation.

on the grounds of

A simple embodiment, assuming that the blow-prepared mixture is made directly on the substrate. For this veiled surface pre-dense polyethylene film, and then the mixture is applied distributed evenly over the bottom and compacted.

To "warm floor"

Stacking is made on a semi-dry screeds electric or Warm water floor. The prepared solution was spread evenly over the surface leveled and compacted.

After 24 hours but not later than 72 hours, cut expansion joints having a width of 3-4 mm to a third thickness. Location of expansion joints is selected in such a way that heating circuit with them not intersect either located inside special plastic transition.

With reinforcement

If the operational load on the floor is large enough, when the screed apparatus should take care of additional reinforcement. Using special grid can significantly improve the strength characteristics of the formed layer.

With insulation

, Care should be taken further if the units are semi-ties in a cold region, or on the first floor of an apartment or house floor insulation. As thermal insulation material most commonly used mineral wool slabs. The use of other heaters. They are placed on the waterproofing layerWhich is poured from the top layer of the prepared mixture.

With the installation of acoustic insulation layer

laying embodiment, involving the use of a special membrane coating or polyethylene foam, is placed under or over the screed. The first variant is more common. Laying of the web material is performed in such a way as to obtain an overlap of the wall at least 15 cm. Then, grid mounted and produced pouring concrete mortar pulling up a desired thickness. The solution is sealed. Cut seams.

Thickness

The geometrical parameters of the layer formed is directly dependent on the conditions of the subsequent operation of the floor. The minimum thickness is 3 cm, the optimum - from 4 to 5 cm. With substantial operational bases load size increases. Since the layer thickness of 7 cm is able to withstand a load up to 100 kg / m².

Attention! If the scheduled heating circuit device screed dimensions relate to the diameter of the tubes used.

Calculation of material consumption

To ensure the formation of high-quality semi-dry screed for floors, enter into the composition of the mixture components in the correct proportions. For this:

• mix cement and sifted sand in the ratio 3: 1;
• was added to each 100 kg of a mixture of 0.8-1 liters of plasticizing substances;
• introducing into each cube solution of 0.6 kg of fiberglass;
• adding water in a volume, which allows to obtain a solution with optimum ductility.

Volume of brewed solution will depend on the floor area and the thickness of the cast layer. To calculate the required amount of finished mixture is sufficient to multiply the indicated parameters, expressed in meters. On average, for the device screed 5 cm required 15 kg of cement, 65 liters of sand, water buckets 2-3 and 35-40 g of plasticizer.

How is the semi-dry floor screed: stacking technology

Durability and strength properties of the base is closely linked with the observance of the technological requirements when performing assembly work. We offer to meet with the sequence of actions, following which you will be able to form a coating that can last for many years. Works are carried out manually.

Materials and tools

At the beginning of installation, the need to have available all necessary for preparation of the solution, as well as:

• laser level;
• generally;
• grater;
• Master OK;
• measuring tool;
• cutter construction;
• mixer building;
• polystyrene plates;
• mesh reinforcement;
• metal profile;
• hardware desired size.

semi-dry floor screed

Preparatory work

Before starting work, clean the floor from dust, dirt and debris. Chipped and uneven grind sandpaper. Cracks previously expanded, embedded solution. If there are pieces of concrete chips, be sure to remove them. Significant differences in height align. Then:

Illustration	Description of the action
	Spread on the base of polystyrene plates in a staggered manner. Place on top of the reinforcing mesh with a mesh of 10 to 10 cm.
	Along the perimeter of the room damping glue tape, which will provide the required level of sound insulation, and will compensate for thermal expansion. In the absence of special material you can use five millimeter substrate for laminate. Damper glue so that it is approximately 1 cm above was future ties.

Comment

Mikhail Starostin

Team leader repair and construction company "Home Premium"

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«If you plan to simultaneously fill a semi-dry screed flooring in adjacent rooms should be provided in the doorway of the technological gap and reinforcing mesh reinforcement. "

Preparation of the solution for dry screed manually

If you can not buy a ready-made solution in which the ingredients are mixed in the right ratio, cook it yourself. For this:

Illustration	Description of the action
	Mix together sand, cement and fibrovolokno plasticizer. Per bag of binder should account for 30 shovels of sand. Preparing a one-time amount. If the amount of the mixture decided to double to mix convenience alternate layers. Carefully shovel twice the resulting volume. Double amount sufficient for the preparation of 0,25 m³ finished coupler.
	Add water in small portions. Per sack of cement is injected slightly more than 1.5 buckets of water. You should get the water-cement ratio of 0.34.
	After waiting 10 minutes, the mixture is moistened thoroughly mixed. We are doing it twice.
	Check readiness resulting mixture. Molded lump should turn out tight and damp, but the surface should be moisture. Lump and should not crumble.

fill

By stacking a semi-dry screed proceed immediately after preparation of the solution. Unacceptably long waiting times, since an hour the mixture may be poorly aligned. Doing it this way:

Illustration	Description of the action
	Forming the border poured screed. To do this, pour the track. Slightly raising the net, helping the composition to be on the plates. Compacted strip formed by hand, kicked, or with a special tool. Pressed into the track formed metal profile, exposing it to the level.
	Pour the mixture into the enclosed space. Lifts the grid to the composition was under it. Compacted mixture.
	Using generally redistribute the mixture on the surface, ensuring the formation of a layer of sufficient thickness. It is necessary to achieve a perfect surface leveling.
	The next day, to close up the furrow of the lighthouse, using a mixture of a large amount of water. Great hydration is needed because the coating formed on the eve necessarily absorb some moisture.

Attention! Before the formation of the subsequent strip should always be cut at right angles to the edge of the previous one, in order to avoid it breaking off.

We offer watch a video, which clearly shows how the hand can be poured screed:

Waiting time for drying

After one day with the help of rules remove all surface to have bumps. Pour via watering each square with 1.5 liters of water to be compensated occurred evaporation. Spreads across the floor plastic wrap and leave for two weeks, a month. The second option is preferred. The film should fit snugly to form a coating. The presence of the slits is unacceptable, as it can provoke premature evaporation.

Share in the comments what you screed floor poured in your home, in what way, how long you are exploiting it and if satisfied with the result.