Pros and cons of a semi-dry floor screed technology and its devices

Features of creation and proportions for floor screed solution

Since semi-dry method of organizing the tie came from the wet, the ingredients used and the same. Portland cement M300 or M400 is mixed with fine sand. The difference is only that proportion of the solution for floor screed is completely different. Water is added to the mixture in a very small amount sufficient only to activated cement crystallization process. Such a mixture has no fluidity, and has the consistency of thick gruel.

This fact determines the features of the technology of its creation. The solidification of the solution is very fast due to the small amount of liquid. If the layer is small, the strainer just do not have time to bond with the substrate. This can lead to delamination, that would cause "buhteniya" when standing up at the station. If the thickness becomes greater than 5 or 7 cm, such a tie would be very difficult. Pressure of 120 kg can create only 1 m

² semi-dry floor screed. Pros and cons are of each other very fine line.

Knowing this, you must solve the problem of reducing the weight at a constant thickness. Make it possible only to reduce the density of the entire monolith. The best material for this purpose is expanded clay aggregate, Used to make a pillow. Poured over it and align the semi-dry mixture. Base on the basis of semi-dry mixture is floating. It is not sealed tightly or with no floor slabs with walls. From floor screed waterproofing layer is separated, and the walls of the damper tape around the perimeter. It also prevents the spread of sound vibrations from the floor to the walls. This measure avoids cracking of the screed surface when dry solution.

Useful advice! To reduce the risk of cracking in semi-reinforcing solution should be administered additive. Most often they are used as fibrovolokno which has low weight with sufficient reinforcing properties and strength characteristics.

Pros and cons of a semi-dry floor screed owe much to the fact that in it instead of using mesh reinforcement fibrovolokno, which is much cheaper and easier to install. Dry polypropylene yarn, which are added directly into the solution very strongly linked monolith ties in all directions. These fibers have a preventive effect on the tie, not allowing cracks to form. There is no prohibition on the use as a conventional reinforcement grid, but it is unwise to do, as you have to carry out the whole process in three steps. Initially, a first layer stack thickness of 2 - 3 cm, on which is mounted the net, associating it with wire. Only then create a second 2-inch layer of mixture, which is then flattened. This technology is not only more difficult but also more expensive.

Algorithm semidry device floor screed

Semi-dry floor screed, the pros and cons of which depend on the correctness of its styling requires careful preparation of the base. Plates of overlap thoroughly inspect and remove from them all loose areas. Cracks and pairing place with walls thoroughly scrub and coat with cement mortar. Remove all the traces of paint and grease stains. Thereafter, the entire surface is vacuumed floors, leaving no dust.

A mixture is prepared from cement brand or M400 and river sand quarry. Since it is very thick, it is better to mix it into the concrete mixer. In a pinch you can use a large sheet of plywood with borders. There are certain requirements for all components of the mixture:

• sand fraction should be not more than 2.5, with inclusions of clay is not more than 3% but no particles of peat or other vegetable fibers. Humidity recommended natural sand;

• cement should be fresh in unopened packages. If the floor is supposed to operate in difficult conditions, the cement brand M500 to choose;
• water can not be supplied from the reservoirs, since it may be in admixture of biological origin or any contaminants. The reason is better to take normal tap water. For all its drawbacks, it is the best option for the preparation of the mixture, used to make semi-dry floor screed. Pros and cons of such a mixture will look at later.

Useful advice!In the absence of mixers solution can be prepared in a plywood sheet by the "volcano". To do this, the components alternate shoveling imposes on the sheet, creating a hill, like a volcano. Then the whole is stirred and poured into water, mixed with fiberglass in the right quantity. The mixture should be crushed in the hand, forming a lump, from which it is impossible to squeeze out a drop of water.

Useful advice!Ready antennae need to cover with plastic wrap for a week, where it hardens naturally. If much hot, the surface should be watered from a watering can about 5 days. This will prevent it cracking.

Pros and cons of a semi-dry floor screed

In general, the pluses and minuses of a semi-dry floor screed based on the characteristics of its devices. However, we can summarize the above and include the following benefits:

• little water is used to promote rapid drying and impedes the flow of water through the overlapping neighbors;
• surface is obtained almost perfect;
• no shrinkage and cracking during drying;
• due to the reinforcing fibers it is possible to achieve a small thickness with a sufficient strength.

Among the weak point: bad flowability, the complexity of the preparation mixture and hand lay, fear of moisture due to the possibility of provoking resumption process cement crystallization.

Whatever the pros and cons of semi-dry floor screed had, its use is fully justified in a residential area, but is not recommended in bathrooms, kitchens and bathrooms, as water leaks can damage the tie, and with it the topcoat.

Semi-dry floor screed (video)