To finish the internal and external surfaces of the house today, many different materials are used, each of them requires the presence of work skills, as well as some knowledge in the field of construction. Regardless of whether you were engaged in repair work or not, you should be aware of the Knauf trademark, the plaster of this manufacturer is popular all over the world today.
In the assortment you can find materials for interior and exterior work. Among the first, Knauf Rotband should be singled out, while the representative of the second variety is Knauf Unterputz UP 210, which will be discussed below. In order not to overpay, experts do not recommend purchasing a composition for external work if you plan to do interior decoration. This is due to the fact that such compounds are more expensive due to the fact that among their characteristics is increased resistance to aggressive effects of moisture and temperatures, which can vary significantly duringyear.
Characteristics of the Knauf Rotband gypsum mixture
Knauf gypsum plaster is designed for interior work, it is made in Russia, so its cost is not too high for domestic consumers. For a 30 kg package, you will have to pay 360 rubles. A 10 mm layer will dry in three days, and the consumption per square meter will be 8.5 kg, which is true if the layer has the same thickness. This composition has a gray color, and can be operated at temperatures from +5 to +45 °. After preparing the solution, it should be used up within 30 minutes, so you should not mix too much of the mixture. The layer thickness can vary from 5 to 50 mm. This product is not intended for outdoor use. Among its qualities, elasticity should be highlighted.
Main features of the composition of "Knauf Rotband"
Rotband Plaster Knauf is a versatile gypsum mixture for hand-finishing walls and ceilings. The composition is suitable for almost any base, whether it is brick, concrete, polystyrene foam, plaster or cement surface. If you plan to use this mixture for finishing ceilings and walls, you should take into account that it should be used in rooms with a normal level of humidity. The product is also suitable for use in kitchens or bathrooms. If you plan to form a centimeter layer, then 8.5 kg should go per square meter. Builders especially liked Knauf Rotband plaster for smooth walls.and concrete ceilings.
Preparation before using "Knauf Rotband"
The base must be dry and have a temperature of at least 5° before applying the mixture. The surface is cleaned of deposits, dirt and dust, as well as formwork grease. Protrusions should be removed, and metal elements are coated with anti-corrosion compounds. If we are talking about highly absorbent surfaces, then they are coated with a primer using an airbrush, brush or roller.
Knauf "Rotband" plaster can be applied to a slightly absorbent surface, which is pre-treated with a "Betonkontakt" primer to increase the adhesion of materials. Expanded polystyrene, drywall and cement plaster must be dried after treatment with Betonokontakt. Sheets of gypsum fiber, silicate products and ceramic bricks, as well as aerated concrete, should be treated with a primer "Grundermittel", which dries after application.
Installation of lighthouses and preparation of plaster mortar
Knauf "Rotband" gypsum plaster should be applied on pre-installed beacons and protective profiles. On the surface with a step of 30 cm, mounds from the Rotband solution should be applied, into which beacons are pressed. Their alignment is carried out in a separate plane. The distance between the profiles should be less than the length of the rule by 20 cm. On the inner surface of the corner profiles, mounds from the "Rotband" should be applied, removing them 30 cm from each other. Starting fromthe central part and moving towards the edges, the profiles are installed at the corners, this must be done in the same plane with the beacons.
To prepare a plaster solution for 1 bag of dry mix, add 18 liters of water. About seven trowels of the composition should be poured into the container and everything should be mixed well. After the mixture remaining in the bag is poured into a container and mixed until a homogeneous consistency is obtained. If necessary, you can add liquid or dry composition to the tank, mixing it. The result should be kept for about 5 minutes. When applying the mortar to the wall or ceiling, it is unacceptable to add a dry mix or water, as well as other components.
Applying plaster
Recently, consumers are increasingly choosing Knauf products, Rotband plaster from this manufacturer can also be bought by you. The technology of its application must be familiarized even before the preparation of the solution. Using a plaster falcon, the solution is applied to the surface of the ceiling. If you are working with a wall, then the movements should be directed from the bottom up. As an alternative solution, the composition is thrown with a trowel. In the first case, the surface is leveled by the rule.
If it is necessary to form a sufficiently thick layer of plaster, first the mixture is applied with a pile before drying using a plaster comb. The next layer is applied a day after the first has completely hardened. On expanded polystyrene or CSP plaster is applied together with a reinforcing mesh, the dimensions of whichshould be equal to 5x5 mm. The mesh is embedded to a third of the depth of the layer.
Alignment recommendations
When you visit the store, you can see that a large assortment of Knauf brand products is presented, the plaster of this manufacturer can be designed for external and internal work. If you used the latter variety, then the setting of the mixture will occur 45-60 minutes after application. At this stage, the master levels the surface with a metal spatula or rail, filling in the recesses and cutting off the excess. On slopes and corners, irregularities should be cut with a plaster planer.
Smoothing and grouting the surface
If it is supposed to stick wallpaper on the wall or paint the base, then after a 15-minute exposure, the surface is wetted and wiped with a sponge or felt grater. This allows you to even out the recesses and marks from the spatula or lath. As soon as a matte shade appears on the surface, the plaster is smoothed with a wide spatula or a metal grater. After drying, such a wall will be ready for wallpapering. If you want to achieve a glossy surface, then 3 hours after applying the mixture, the plaster is wetted with water and smoothed with a grater. This must be done within a day, after the plaster will not have to be puttied, as it will be ready for painting.
Characteristics of "Knauf Unterputz UP-210"
For external work, you can use cementKnauf plaster, which is supplied in 25 kg bags and costs the consumer 243 rubles. This leveling mixture is made on a lime-cement basis. The composition is intended for manual and machine application. "Knauf Unterputz" can be used for plastering not only facades, but also ceilings, as well as walls in rooms with high humidity. This should include garages, basements, etc. With success, this composition is used to level the bases for facing with natural stone, decorative plaster or tiles. The mixture is intended for internal and external works. The consumption of dry composition per square meter is 16.5 kg with a layer thickness of 10 mm. In the process of work, freezing and rapid drying of the plaster until it hardens should not be allowed. The decorative coating can only be applied after the plaster layer has dried.
The product is made on the basis of special additives, cement and fractionated sand. The mixture is able to increase the water-holding capacity of the surface, the material is plastic and makes it possible to form the thinnest layer of the solution. In the process of drying, the mixture does not shrink, cracks do not form on it. The application can be carried out with a continuously running pump or manually. Knauf facade plaster has a grain size of less than 1.5 mm, adhesion is 0.4 MPa. The compressive strength is more than 2.5 MPa, and the viability of the solution can vary from 1.5 to 2 hours. The water-holding capacity of the mixture is more than 98%. The frost resistance indicators are also very impressive and amount to 150 cycles.freezing and thawing.
Design Features
Knauf products have a fairly reasonable cost, facade plaster is no exception. But in order to achieve a positive result, you must follow the rules of application. For example, Knauf "Unterputz" can only be used at positive temperatures, as well as on completely dry surfaces. The base must be freed from loose particles, otherwise errors cannot be avoided during the application process. Subsequently, some elements of the plaster may simply move away from the surface of the wall.
