To level the surface of walls and streams inside the house, it is recommended to use ready-made dry mixtures. The most popular option is universal gypsum plaster - rotband.
This is a plaster mixture produced by the Knauf company. More detailed instructions for use and consumption of gypsum plaster Knauf Rotband 30 kg are discussed below.
How to use
To calculate a sufficient amount of dry rotband, determine the curvature of the walls and the thickness of the layer. Use special plumbs and levels. If there are no such devices, use cords that are stretched along the plane. The longest distances are taken into account when calculating.
For example, the distance is 2.5 cm. Considering that 8.5 kg of mixture is required for 1 square meter and a layer of 1 cm, multiply the value by 2.5. The result will be 21.25 kg. Then multiply the resulting value by the area of the room, and divide by 30. This will allow you to understand the consumption of rotband per 1 m2.
How to breed a rotband? For 30 kg of bulk mixture you will need about 18 liters of clean, cool water. 5 minutes after mixing, start working.
Try to use everything within half an hour to prevent the mixture from hardening.
Kneading is carried out in a plastic or metal container.
First, it is recommended to put 6 spatulas of the mixture into it and mix with water until a homogeneous consistency. Stir with a construction mixer so that no lumps remain. If the mixture is too liquid, add a little more dry mixture.
If the base absorbs moisture strongly, it needs to be primed. Thanks to this, the plaster will adhere better to the base. The primer is applied using brushes or a roller. If the work area is large, use a sprayer.
The finished mixture must be applied to the base within a third of an hour. Work on the canvas is carried out with the help of a falcon. Movements should be towards yourself.
It is better to apply the solution using a spatula.
After the rotband is sketched, level the layer.
Scheme for throwing the solution on the ceiling:
The movements should be wavy. If increased coating thickness is required, apply repeated coats. In this case, it is necessary to form roughness on the previous one.
They will enhance adhesion between layers. The second coating is applied only after 24 hours. This is enough for the previous layer to dry.
Afterwards you can begin leveling and grouting. According to the technical specifications, setting occurs in the first 50 minutes. Afterwards the layer needs to be leveled using a large spatula or a metal lath.
If there is excess, it must be removed and all unevenness must be covered. This will reduce consumption. If the walls are to be painted or covered with wallpaper, you need to rub them down with a float. The walls are moistened with water and then rubbed in a circular motion. This will ensure a smooth surface.
If relief is required, this can be done quite quickly. Roll over the soft surface with the embossed roller placed on the wheel. A trowel is good for creating a structure.
You can speed up the drying rate of the rotband if you open the windows and doors and turn on the ventilation. Drying should be carried out at a temperature of +5°C. Remember that hardened mortar is difficult to remove. Therefore, it is recommended to wash all tools immediately upon completion of work.
If there are metal elements in the room, they must first be treated with anti-corrosion liquid. Otherwise, corrosion will appear through the rotband, which will ruin the appearance of the room.
How to calculate Rotband consumption, table:
Composition and characteristics of plaster based on gypsum mixture
Dry plaster "Rotband" is rightfully considered a universal mixture. It is used for any interior finishing work, leveling concrete and brick walls or cement-bonded particle boards. This versatility is due to the composition of the plaster.
The mixture is based on gypsum, which reacts well to a humid environment, so Rotband can be used to level walls in bathrooms and toilets. By the way, this is the only type of gypsum plaster that is suitable for finishing such premises. In addition to gypsum, the composition includes polymer materials that increase adhesion (adhesion to the surface). Therefore, the plaster adheres well even to smooth wall structures.
In addition, the composition may contain coloring impurities that give the composition a pink and gray tint. These components do not affect the quality of the plaster as a whole.
Specifications table
| Technical specifications | Unit | Magnitude | |
| Working temperature | WITH | 5 – 30 | |
| Thickness of applied layer | minimum | mm | 5 |
| maximum | 50 | ||
| recommended | 10 | ||
| Consumption of dry plaster mixture with a layer thickness of 10 mm | kg/m2 | 8,5 | |
| The amount of solution obtained from one bag weighing 30 kg | l | about 40 | |
| Time | solution maturation | minute | 10 |
| life of the solution in an open container | 20 – 25 | ||
| drying of a layer 10 mm thick | 45 – 60 | ||
| full strength gain | day | 7 | |
| Density | dry mixture | kg/m3 | 730 |
| dried plaster | 950 | ||
| Strength of hardened plaster | bending | MPa | more than 1.0 |
| for compression | more than 2.5 | ||
| Grit size | mm | up to 1.2 | |
| Plaster color | — | white, gray, pink | |
| Shelf life in undamaged packaging | month | no more than 6 | |
Features of packaging and storage
As mentioned earlier, rotband is packaged in bags of different weights. The bags are made of paper. Despite this, they do not accumulate condensation, which is why the composition is preserved for a long time.
Storage is recommended in rooms with low humidity. It is better to use wooden pallets.
If the bag is open or damaged, try to use it first.
Rotband can be stored in undamaged bags for up to six months.
How long does it take for Rotband to dry?
Drying of plaster depends on many factors, but on average the drying time of a layer of 15-20mm at a temperature of 20C and air humidity of about 60% is approximately 7 days.
For quick drying, it is necessary to ensure good ventilation and absence of drafts in the room. Do not point the heat gun at the plastered surface, as this may lead to defects.
To speed up drying, you can use dehumidifiers that condense moisture from the surrounding air.
Differences from fake
Today, unscrupulous sellers, for the purpose of profit, can sell a fake at the price of the original Rotband.
The purchase of such goods is fraught with discrediting the building material, since in the future the demand for it will be lost.
That is why, in order to avoid further adverse consequences, the Knauf company took care of its reputation.
It was decided to pack the plaster in unique bags. They are made from corrugated paper. The production of bags is carried out only by order of the Knauf company. This means that other brands may not have them. Second-by-second markings are also applied to the bags.
This means that each package contains information about the exact production time. Therefore, you will not be able to find two identical packages on the market. The Knauf company also puts a hologram on the bags. It changes color if you rub it a little.
Analogues. What's better?
It is worth noting that there are several types of gypsum-based dry plaster on the construction market. Therefore, if you wish, you can choose a good alternative to Rotband. However, how feasible would such a replacement be? To answer this question, you need to compare the characteristics of the most popular plaster mixtures.
"Volma" or "Rotband"
If we talk about technical characteristics, there is no significant difference between the mixtures. At the same time, Volma is much cheaper, which promises financial benefits for large volumes of work. In addition, “Rotband” is often counterfeited, so even at a high price you can buy a low-grade counterfeit.
"Teplon" or "Rotband"
Comparing these mixtures, you can notice the difference in price: “Rotband” will cost significantly more. At the same time, the consumption of "Teplon" looks more economical - 4.5 kg/m2 . In terms of quality, “Rotband” looks more attractive, so if your budget allows, it is better to give preference to this particular plaster.
"Goldband" or "Rotband"
The mixtures are produced by the same company, so they have no fundamental differences in price and quality. However, in the field of application the difference becomes noticeable. In particular, Rotband has better adhesion, so it can be used to level rough and smooth surfaces. The analogue does not have this feature, therefore it is used only for rough walls, which initially provide high adhesion of materials.
In general, “Rotband” can be replaced with an analogue, especially if the issue of price plays a decisive role.
Briefly about the main thing
As mentioned earlier, rotband plaster is very economical. If you know how to work with similar materials, you can use it as a starting and finishing layer.
Therefore, the surface of the wall and ceiling will be fully prepared for further decorative work. Rotband is a safe material because gypsum and polymer additives are used in its production. Applying the solution to walls is easy and is also suitable for beginners.
The only downside of rotband is that it hardens quickly. Therefore, work must be carried out quickly. At first, try to prepare the composition in small portions. Before using the rotband, you can practice a little on a hidden area of the wall. It is necessary to fill your hand so that the application goes “smoothly”.
Rotband color
Rotband in Russia is produced at several factories. On each bag, after the date and time of production, a digital code of the manufacturer is indicated. Depending on the presence of various natural impurities in the raw material (natural gypsum), the color of the plaster may vary.
Letter designation of the manufacturing plant:
- A - Knauf Gips Krasnogorsk LLC, Moscow - gray mixture;
- B - Knauf Gips Kolpino LLC, St. Petersburg - gray mixture;
- C - Knauf Gips Kuban LLC, Krasnodar - light (white) mixture;
- D - Knauf Gips Baskunchak LLC, Astrakhan - light (white) mixture;
- E - Knauf Gips Chelyabinsk LLC, Chelyabinsk - light (white) mixture;
- F - Knauf Gips Baikal LLC, Irkutsk - gray mixture;
- G - Knauf Gips Chelyabinsk LLC, Samara - gray mixture;
- H - Zvenigovsky Construction Gypsum Plant LLC, rep. Mari El - gray mixture;
- I - Knauf Gips Novomoskovsk LLC, Tula - gray mixture.
At what thickness of walls can they be plastered without metal mesh?
It is necessary to level the brick walls in the house. At what thickness can you plaster walls without metal mesh?
At what thickness can you plaster walls without metal mesh?
I was very surprised by the question. I'll try to guess what it is fundamentally based on. The author of the question does not know what the grid is needed for and does not see the point of using it.
This chain of thought is also logical: before, no mesh was used, they just plastered and nothing, and only in the most difficult cases, when the plaster “didn’t want” to hold on and fell off over and over again, did they resort to using additional fixation of the “plaster” with a mesh. In Soviet times, this was exactly the case, especially from those craftsmen who worked “on call, homeworkers.”
There was no watchful eye of GOST, you could “be as clever as you want.”
Nowadays, homeworkers are different; they won’t do just anything and, most importantly, no one will want to plaster without a metal mesh anymore.
At what thickness can you plaster walls without metal mesh?
Leveling walls using a mesh, they come in different varieties, not just metal, is called reinforcement.
For good adhesion , adhesion, mortar to the wall, you need to thoroughly clean the surface, carefully coat it with a primer appropriate for the mortar, comply with all standards and recommendations for the use of primers, follow the rules of compatibility of soil and mortar, and do not forget about the temperature regime.
An example from myself: a crack is a centimeter long, the depth of the crack is 5 centimeters, the depth of the depression is 2 cm, there are bumps with a protrusion height of a centimeter.
To level this surface per square meter and one crack along its entire length without reinforcing mesh, it will take me two or three hours, all this will be done with 4-5 stages of applying the plaster layer (you need to follow the plaster standards). With reinforcing mesh, I can handle this area in half an hour in one or two approaches.
Speeding up the work process by 3-4 times with a perfect surface result in the end? Of course, I will choose reinforcing mesh, it is profitable, convenient, fast, and effective.
Source
Smoothing the surface
When the gypsum plaster has already visually set, thereby visually beginning to acquire a matte tint, it should be smoothed out with a large spatula, making wide longitudinal movements. After this, you can safely glue wallpaper to the surface. If you want to achieve glossiness from the applied Rotband plaster, then you need to do the following: 2.5 - 3 hours after applying the plaster to the surface, apply a moisturizing layer of water, then smooth the applied mass again using a metal grater.
Review of Rotband Knauf brand plaster mixture
The widespread use of gypsum-based mixtures began in the 60s of the 20th century. Until this time, builders prepared the compositions themselves, adding components in different proportions, and quite often simply “by eye.” The craftsmen mixed a small amount of solution, since gypsum is a material with a high degree of hardening. Rotband plaster appeared in Russia only in 1993, although before that it had been successfully used on construction sites in Europe for more than 25 years. The Knauf company has firmly taken a leading position in the market and has not left it to this day. The products are produced in traditional 30 kg bags, as well as in packages of 5 and 10 kg.
The excellent quality inherent in the German plaster composition produced at Russian enterprises compensates for the higher price of the product compared to the cost of domestic analogues. Reviews of the original factory Rotband cannot be negative. At the same time, counterfeit goods of dubious quality are presented on the market. Its packaging also bears the logo of the German brand and contains instructions for use. To protect themselves from counterfeiting, consumers need to buy the mixture from reputable stores, and not from private retail outlets.
"Knauf" for finishing work
In addition to the production of plaster gypsum mixtures, Knauf Gips KG produces building materials for finishing work. In the case of using dry mixtures of pink color, with large grains, as well as other materials, it may be necessary to improve the smoothness of the resulting surface.
For final leveling and bringing the smoothness to the required level, “Rotband” putty is indispensable, which is made on the basis of polymers containing marble flour, has high plasticity, is easy to work, and is polished with high quality.
Structuring the surface
Professionals know about this, but you may not have heard yet that the applied Rotband gypsum plaster does not have to be left in the perfectly uniform and smooth form in which you applied it. Many people like to give the applied mass various shapes and even designs!
All you need to do for this is to roll a handy textured roller over the mass that has not yet completely hardened, or be creative and draw a wide variety of designs using the tools available to you.
Two main advantages of Rotband
The first advantage is a thick layer at a time. Rotband plaster can be applied to the surface in a thick layer of up to 50 mm without the spraying stage. That is, if you need to level the wall by 4-5 cm, place beacons on the wall and plaster it with Rotband mixture in one pass.
The second advantage is that no puttying is required. With high-quality mixing and repeated tightening, you will usually get a smooth wall, which, after covering and simple grinding, does not need to be puttied.
Note: The gypsum mixture can be applied in several layers, waiting for the previous layer to dry completely. This allows you to level walls (ceilings) with unevenness of more than 50 mm.
Preparing the base
Preparatory work begins with cleaning the surface from dirt and old coating. If there are protruding metal structures (lintels, reinforcement, embedded elements, screw heads), they are cleaned and treated with a special primer mixture. If this is not done, then rust will soon appear on the front of the plaster.
If the walls are made of concrete, then they should be treated with a primer mixture that includes quartz sand. For example, with Ceresit CT16 primer. To treat a porous surface, it is better to use the deep penetration primer Ceresit CT17.
Before preparing and applying the plaster mortar, the walls must be marked. To determine the exact geometry of one wall, you need to screw four self-tapping screws into its corners. After which the fishing line is taken and pulled between the screws. Moreover, the tension of the fishing line occurs both along the perimeter of the wall and along the diagonals.
Using a level and plumb line, the fishing line is positioned strictly in a vertical position, without touching the surface of the wall. The result should be a horizontal plane. If there is a section of the wall that protrudes beyond the boundaries of the fishing line, it must be cut off.
After marking the surface, you may find that electrical switches or sockets are located in the recess. In this case, it is recommended to move them to another location or install new sockets altogether.
As for the junction boxes, in most cases they are covered with plaster, and their location is necessarily written down in a notebook or notebook. If the ceilings are made of tension or suspended structures with spotlights, then the electrical wiring will be laid before the walls are leveled with Rotband.
Video description
The video will tell you about the difference between Rotband and other gypsum plasters: Experienced craftsmen believe that for the final hardening of the applied layer of plaster and for it to reach the standard humidity, it takes the same number of days as its thickness is in millimeters. After this, you can putty, paint the surface and finish it in another way.
It's another matter if the alignment is performed in several layers. In this case, it is better not to allow the previous layer to dry out, but to apply the next one on a damp surface.
For reference! The maximum thickness of one layer of plaster should not exceed 30 mm.
The mixture is available in 10 and 30 kg packages in three-layer paper bags that protect the contents from moisture. In them, it retains its properties for up to six months. Violation of the integrity of the packaging significantly reduces this period, so it is necessary to monitor this when purchasing, transporting and storing the material.
There is also another packaging available in stores - 5 kg in plastic bags Source a-komplekt96.ru/
Application area
Rotband gypsum plaster mixture is used for finishing work indoors with normal and low relative air humidity. At the same time, it is allowed to use rotband plaster in showers, bathrooms, and also in kitchens.
Rotband plaster is characterized by good physical and mechanical properties, in particular high adhesion, high setting speed, strength, etc. Thanks to the optimal set of chemical modifiers in the mixture, rotband plaster can be used for finishing work on almost any type of floor: brick, concrete, wood , expanded polystyrene, cellular concrete, plasterboard, metal, etc.
