Stucco-glutinous mixture "Knauf-Sevener": technical characteristics, reviews

"Knauf-Sevener" is a modern dry mix, which is made on a lime-cement basis. It is intended for indoor and outdoor work. Among the ingredients are special fibers, as well as polymer additives designed to provide high adhesion, water repellency and crack resistance.

general description

The process of manufacturing the described mixture is a compound of binders with adhesion 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, which protects the layer of insulation or masonry from getting wet. The microclimate inside the living quarters does not deteriorate, since Knauf-Sevener has a low water vapor diffusion resistance.

This mixture should be used in the installation of external insulation systems for buildings of different purposes, when gluing to the base of insulation boards, they can be made of mineral wool, as well as expanded polystyrene. On their surface can be reinforced reinforced glass fabric mesh, which is subsequently covered with decorative plasters.

For reference

The described plaster-glue mixture can be applied to strong, structured and cleaned plaster bases on a mineral base. As a rough surface, a dispersion coating or a plaster mixture based on artificial resins may be used.

Scope of use

"Knauf-Sevener" is used to repair cracked old plaster facades, and also as a solution under the reinforcing mesh. The latter is laid on hardened plaster for masonry work from mixed materials. The mixture can act as a cohesive plaster for porous and smooth concrete surfaces. Sometimes "Knauf-Sevener" is laid with a thin intermediate layer on concrete surfaces. Use in this case can be 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 a 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 equal to 0.87 W / m · ° C. The absorption coefficient is less than 0.5 kg / m² · h.

Information on material consumption

"Knauf-Sevener", the technical characteristics of which are presented in the article, may be useful 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 the insulating surfaces, which are flat and covered with old plaster, will leave 3.5 kg / m ² . If the insulation panels are being laid, which are laid with masonry, then it will take 6 kg / m ² . The puttying can be used as a protective layer, which is applied to insulating boards, in this case 7 kg / m ² is required. The average consumption of material when plastering old plaster on the grid is 5 kg / m ² .

Testimonials on the technology of use

"Knauf-Sevener", reviews about which are often the most positive, should be applied according to a certain technology. According to users, first you need to prepare the base, then you can start to close the solution. The next step is the application itself. If the work is carried out under special conditions, fresh plaster must be protected from rapid drying and exposure to low temperatures. As the buyers emphasize, it is possible to apply the decorative layer only after the plaster layer has dried completely.

Reviews about some features of the plaster-glue 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 outdoor and indoor work. The basis is cement, which is an inexpensive component, which determines the low cost of the material. This composition, according to customers, performs several functions at once, among them it should be noted not only decorative, but also insulation.

Surface preparation is relatively simple, therefore, even an inexperienced person will be able to cope with these works. All you need to do is thoroughly clean the base of the dust and check it for strength. As the users emphasize, the composition has fractional sand among the ingredients, which ensures a 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 under the influence of negative external factors in the form of precipitation.

Optional: features of use

The Knauf-Sevener blend has a fairly simple application technology, however it is necessary to observe certain conditions when carrying out the work. For example, the temperature of the outside air should not fall below + 5 °. Otherwise, the drying stage will be violated. If there are contaminants on the surface, it is quite easy to get rid of them by a method of washing with water supplied under pressure. If there are potholes, they should be plastered beforehand. The surface should be leveled with plaster before applying a 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 reinforced with a primer that dries within 3 hours.

The solution is applied around the perimeter and in the center when used on insulating boards. The application can be made with a zigzag strip or dots. The width of the strip should be 5 cm, while the thickness of the layer is 2 cm.

Conclusion

If the Knauf-Sevener plaster-glue mixture is applied in the form of a thin layer over the concrete, a 5 mm surface should be created, which is subjected to smoothing. Once the solution has reached a certain hardness, you should get rid of the influx with a float. When creating a plaster bridge for aerated concrete, the application should be carried out with a layer of up to 10 mm, which is smoothed out after three days.