Stages of arranging dry screed

The first stage – surface preparation. The start of the installation of dry screed begins with the dismantling of the old sex. After that, they are embroidered and subsequent sealing of cracks and cracks between the plates, and it is also necessary to close large potholes. Clean the prepared surface from garbage. The second stage is waterproofing. Moisture is destructive for floors made according to the dry method, so the waterproofing of the surface is an important stage in the installation of the screed. I use a laser or hydraulic level, we make a layout of the backfill level. After which the surface is covered with a plastic film, so that the film strips overlap each other with a width of the floor at least 20 cm. The film should rise to the level of the future screed. As a waterproofing layer, you can use a plastic film with a thickness of at least 200 microns, or you can use more modern vapor barrier materials (Utafol n, traffic lights). The third stage is sound insulation. To exclude the deformation of the floor as a result of the natural expansion of the material under the action of temperature, it is necessary to leave a gap of 10 mm along the entire perimeter of the floor. Soundproof material should be placed in this gap. As a rule, for this, a bromic tape made of mineral wool or polyethylene foam is used. Fourth stage – backfill. The prepared surface is filled with bulk material, with which the surface is aligned to the required level. Backfill provides high thermal insulation and sound insulation of the future sex. Bowing materials with minimal shrinkage, low hygroscopicity are used as a backfill, and the material should not be fuel. For these purposes, such bulk materials as expanded clay, swollen perlite sand, slag fine granularity are great for these purposes. As a rule, the thickness of the backfill is from 30 to 50 mm, it all depends on the individual characteristics of the floor or the presence of any communications located in the floor. If the backfill thickness exceeds 60 mm, then it is necessary to lay an additional layer of plates in order to enhance the screed. In some cases, it is not required to align the surface of the base of the floor, in such cases, instead of filling, polystyrene plate foams are laid. They can also be used in conjunction if you need to strengthen thermal insulation. When laying the plates, pay special attention to the density of the joints, and also do not forget to lay the brown tape in the gap between the slabs and the wall. The fifth stage – laying the floor elements. The installation of floor elements start from the entrance doors. This is done in order not to violate the surface of the backfill. When laying on the heat -insulation plates, laying is carried out from the opposite wall. As the finish elements of the floor, moisture -resistant plywood, chipboard, moisture -resistant gypsum sheets are used. Modern manufacturers offer to use prefabricated floor elements made using KNAUF technology. They are two glued GVLs glued together, supplemented by a layer of polystyrene foam. The floor elements are laid in one or two layers, while fastened the sheets with each other with glue and self -tapping screws.