A flat floor surface is an important condition for each apartment or house, the violation of which leads to a deterioration in the quality of the coating and subsequent correction. Dry backfill for the Knauf floor is often used to create a high-quality surface due to the smaller amount of work required compared to the usual screed.
Composition
This material is a popular and common method of arrangement. Expanded clay chips are included in its composition, due to which it retains the same density and thickness throughout the entire period of use, since expanded clay is highly resistant to shrinkage. Dry backfill for the floor has many useful characteristics, such as resistance to mold, microorganisms, moisture; high operational properties; lightweight porous structure and harmlessness to humans due to the content of burnt clay - expanded clay.
The material includes two components: a draft floor based on gypsum fiber paintings and the screed itself. Perhaps the sequential performance of warming and leveling. In particular, after the draft basis is formed on one half of the room, the existing objects are transferred to it, then the arrangement of the other side begins.
What to look for
The granules are round in shape with a diameter of up to 5 mm, which ensures proper compaction. There are several varieties for use under various technical conditions and operating loads. Average consumption is 15 liters per 1 sq. Km. m, provided that the laying thickness is not more than 15 mm. Its increase entails the need for more backfill. Optimum characteristics of the final coating are achieved when creating a layer of 30 mm or more. So, a dry backfill for the floor ensures that there are no deformations or damage even when the established loads on the floor are exceeded. Quality material is always sold in branded bags with a volume of 40 or 50 liters. Before buying, it is advisable to consult a specialist so as not to make a mistake in choosing the size of the granules and the properties of the backfill.
Advantages
The positive aspects are unchanged regardless of the technological process and type of composition. It is worth noting the possibility of arranging the floor in one day in one room. Laying of such coatings as ceramic tiles, laminate, linoleum and others is possible. The use of backfill forms a high-quality sound and heat insulation, which provides a warmer coating compared to those for which a traditional screed was used. There is no additional work after installation of the base, there is also no need for grinding and covering with a special vapor barrier film.
Dry backfill for the Knauf floor, the price of which is 289 rubles per 40 liters, has a small load on the floors. At the same time, there are no shortcomings that are typical for cement-based screeds, and the absence of cavities and irregularities simplifies the installation of parquet boards and other materials without the use of an additional bulk floor.
Dry backfill for the floor: disadvantages
Despite the many advantages, there were some drawbacks, among which the main is moisture conductivity, which requires the installation of a special layer on the floors, after which backfilling is already layered. Vapor-moisture-proof film protects the material from moisture, which is possible when in contact with concrete floors. Bitumen paper and glassine are used on wood surfaces; a polymer film is best suited for reinforced concrete.
Application technology
Dry backfill for the floor, the price of which allows it to be attributed to the budget category of materials, has a simple arrangement and is based on the following: preparatory work, backfill, leveling and installation of the finishing floor. To prepare the base, debris is cleaned, existing defects and cracks are eliminated by the cement composition. The dismantling of the old wooden coating is characterized by the presence of a sand layer, which was previously used as sound insulation. It must be removed before backfilling.
The vapor barrier film is mounted after the completion of all preparatory work. When flooring, the canvas should go on the wall structure and exceed the level of the future floor covering by 10-15 cm. Fastening around the perimeter is carried out using specialized edge tape or adhesive tape with two adhesive sides.
The most crucial step is to set up beacons. It has a great influence on the quality of the entire rough floor. The rake and the material itself are preliminarily prepared. Dry backfill it is poured in the form of a narrow strip length parallel to the wall, indented from it by a distance that is approximately equal to the length of the rail for alignment. Then the second falls asleep, and so on to the opposite side.
Completion of work
Correspondence to the level is determined using a laser device, then the beacons are aligned. Material is poured into the inter-band spaces until a flat surface is formed. Subsequently, it must be tamped and compared with the level of lighthouses.
The following is the installation of the elements of the rough coating, which are gypsum boards mounted on a screed. If there is a need for a layer of more than 15 cm, dry backfill for prefabricated floors is used in two stages, with each layer being leveled and covered with a GVL sheet. The joints are sealed with a special mastic, and the floor elements are additionally fixed with self-tapping screws.