“Knauf-Sevener” is a modern dry mix, which is made on a lime-cement basis. It is intended for indoor and outdoor use. Among the ingredients are special fibers, as well as polymer additives, designed to provide high adhesion, water-repellent properties and resistance to cracking.
general description
The manufacturing process of the described mixture is a combination of binders with adhesive additives, which provides increased strength to the finished layer and crack resistance, which is much higher compared to known solutions. Among the components is a moisture-repellent additive that protects the thermal insulation layer or masonry from getting wet. The microclimate inside the living quarters does not deteriorate, because Knauf-Sevener has a low diffusion resistance of water vapor.
This mixture should be used in the installation of external thermal insulation systems for buildings for various purposes, when the insulation boards are glued to the base, they can be made of mineral wool, as well as expanded polystyrene. A reinforced fiberglass mesh can be strengthened on their surface, which is subsequently covered with decorative plasters.
For reference
The described stucco-adhesive mixture can be applied on durable, structured and peeled substrates made of mineral-based plaster. As a rough surface, a dispersion coating or a plaster mixture based on artificial resins can be used.
Area of use
“Knauf-Sevener” is used to repair cracked old stucco facades, as well as as a mortar under a reinforcing mesh. The latter is laid on hardened plaster during masonry work from mixed materials. The mixture can act as an adhesive plaster for porous and smooth concrete surfaces. Sometimes “Knauf-Sevener” is laid with a thin intermediate layer on concrete surfaces. In this case, you can use a mechanized or manual method. In the first case, continuously operating high-performance pumps are used.
Specifications
Specialists and home masters may be interested in compressive strength and bending strength, these parameters are 4.4 and 2.3 MPa. In the dry state, the mass reaches a density of 1400 kg / m 3 and the density coefficient is 0.52. Since the mixture is used as an insulating layer, you may be interested in its thermal conductivity, which is 0.87 W / m · ° C. The absorption coefficient is less than 0.5 kg / m² · h.
Material Consumption Information
“Knauf-Sevener”, the technical characteristics of which are presented in the article, may be useful to you if you plan to use it for repair work. The composition will be used up in a certain volume, which depends on various factors. When facing insulating surfaces that are even and covered with old plaster, it will take 3.5 kg / m 2 . If the lining of insulating boards, which are laid with masonry, is carried out , then 6 kg / m 2 will be required. Putty can be used as a protective layer, which is applied to insulating boards, in this case 7 kg / m 2 will be needed. The average consumption of material when plastering old plaster on a grid will be 5 kg / m 2 .
Use Technology Reviews
“Knauf-Sevener,” reviews of which are often the most positive, should be applied using a specific technology. According to users, first you need to prepare the base, after which you can begin to mix the solution. The next step is the application itself. If work is carried out under special conditions, then fresh plaster must be protected from quick drying and exposure to low temperatures. As buyers emphasize, it is possible to apply a decorative layer only after the plaster layer has completely dried.
Reviews on some features of the stucco-adhesive mixture
“Knauf-Sevener”, the characteristics of which, according to users, are unique, is quite inexpensive. For a 25 kg bag you will pay 400 rubles. Consumers like that this mixture is universal, because it can be used for exterior and interior use. It is based on cement, which is an inexpensive component, which determines the low cost of the material. This composition, according to customers, performs several functions at once, not only decorative, but also warming should be highlighted among them.
Surface preparation is relatively simple, so even an inexperienced person will be able to cope with these works. All that needs to be done is to thoroughly clean the base from dust and check its strength. As users emphasize, the composition has fractional sand among the ingredients, which ensures high adhesion of the composition to other surfaces. Among other things, the walls acquire water-repellent properties after the layer dries. You can not be afraid that the styling will get wet when exposed to negative external factors in the form of precipitation.
Optional: features of use
Mixture “Knauf-Sevener” has a fairly simple application technology, however, some conditions must be observed during the work. For example, the temperature of the outside air should not fall below + 5 °. Otherwise, the drying phase will be violated. If there are contaminants on the surface, then it is quite easy to get rid of them by rinsing with water supplied under pressure. If there are potholes, they should be plastered first. It is better to smooth the surface with plaster before applying the solution, which should be allowed to dry, which will certainly reduce the consumption of the mixture. In the presence of crumbling surfaces, they must be strengthened with a primer, which dries within 3 hours.
The solution is applied around the perimeter and in the center when used on insulating boards. Application can be done in a zigzag strip or dots. The strip width should be 5 cm, while the layer thickness is 2 cm.
Conclusion
If the Knauf-Sevener plaster-adhesive mixture is applied in the form of a thin layer on concrete, then a 5 mm surface should be created, which is subjected to smoothing. As soon as the solution reaches a certain hardness, you should get rid of the influx with a grater. When creating a plaster bridge over aerated concrete, application should be carried out with a layer of up to 10 mm, which is smoothed out after three days.