Soil concrete contact consumption per m2. Betonokontakt consumption. What is this type of soil

The building materials market is expanding, new items appear - successful and not so good - there are real bestsellers. One of such useful developments was the primer Betonokontakt of the manufacturer Knauf. The purpose of this composition is to separate layers of different properties, but at the same time ensure their strong adhesion to each other. Thanks to the new formula, it is now possible to use the cladding on difficult substrates, saving time and effort on their preparation.

Primer Betonokontakt of the Knauf brand is an adhesive dispersion mixture based on acrylic. It is intended for application to low-absorbent, high-density surfaces, such as a concrete monolith, on which there is simply nothing for the adhesive or leveling mortar to catch on. The primer itself easily adheres to such a base, turning into a solid dark pink film. And adhesion with the subsequent layer is provided by fine-fraction alkali-resistant sand in its composition, which gives the coating the required roughness.

In addition, Betonokontakt Knauf allows you to apply lime and gypsum plaster on cement, although previously it was simply impossible due to chemical reactions that occur between two dissimilar materials. However, experts have found many other types of work, where the new primer came in handy:

• Strengthening before plastering products of low density (polystyrene foam, plasterboard sheets).
• Laying ceramic tiles directly on the old without prior dismantling.
• Application on surfaces coated with oil or alkyd enamels for subsequent finishing.
• Reliable fastening of decorative stucco on any smooth surfaces after their processing Betonokontakt Knauf.
• Preparation of metal structures, as well as reinforced concrete products with removed embedded elements for subsequent puttying.
• Strengthening dusty old concrete before finishing work.

The primer Betonokontakt, whose main task was only to ensure reliable adhesion of the plaster to smooth surfaces, turned out to be very functional. Thanks to her, many repairs were simplified, especially those related to the preparation of bases and the dismantling of old resistant coatings. Where previously it was required to use several special compositions for various purposes or fiberglass, now one almost universal Knauf primer is enough.

Primer Properties

Knauf Betokontakt not only reinforces weak surfaces and increases the adhesion of smooth substrates before plastering. The ability of the acrylic mixture to clog pores and microcracks makes it possible to reduce the consumption of viscous (liquid) finishing materials and retain water in the leveling solutions necessary for their normal setting. Due to this, the plaster does not exfoliate and does not crack from rapid loss of moisture.

The performance characteristics of the Knauf mixture are also worthy of attention. For example, fungicidal additives are already included in its formula, which means that additional antiseptic treatment is no longer required. Betonokontakt itself does an excellent job of protecting walls from mold fungi, reducing your repair costs. To this it is worth adding also the good vapor permeability of the created intermediate layer - it does not interfere with diffusion air exchange between the room and the street.

In some way, the disadvantage of the primer is the need to quickly start further work as soon as Betonokontakt Knauf dries. It is impossible to postpone the finishing, and even more so to carry out other activities in the room in parallel - the rough adhesive layer easily accumulates dust, worsening the properties of the preparation.

Characteristics and consumption

Primer Betonokontakt from Knauf is produced with a mineral filler of two fractions, on which the scope of a particular composition depends:

• 0.6 mm - used before rough thick-layer alignment;
• 0.3 mm - it should be purchased for the preparation of plastered surfaces before puttying.

The pink pigment introduced into the composition allows you to control the application and not miss a single area during processing.

Specifications Knauf:

• Acidity - neutral (pH 7.5-8.5).
• The drying time of the layer is from 3 hours, depending on the humidity and temperature in the room.
• Service life - up to 80 years. Although the material is still too "young" to confirm or refute the manufacturer's claims.
• A wide temperature range of application - according to the characteristics of Betonokontakt, it is quite possible to call a primer for interior and exterior work. After drying, it retains its properties at -40..+60 °C, withstanding at least 5 freeze-thaw cycles.
• Possibility of application by any convenient method (brush, brush, roller, mechanical spraying).
• Absolute environmental friendliness - the use of an adhesive primer is allowed even in poorly ventilated rooms and does not require respiratory protection. Its formula simply does not contain toxic solvents that can harm a person.

Primer consumption depends on the characteristics of the base: smoothness and porosity (absorbent capacity). She will show the minimum result on a tile - 200 g / m 2, on monolithic concretes of different densities, this figure will increase to 250-350 g / m 2.

The Knauf primer is already completely ready for application. However, before starting, it is recommended to stir it with a drill with a mixer attachment at low speed so that the fine sand is evenly distributed throughout the volume. Works are carried out only after cleaning and dust removal of the base. In this case, the temperature of the treated wall should be within +5..+30 °С.

Unlike many similar mixtures, here the manufacturer allows dilution of the primer with water in order to reduce material consumption by 1 m 2 and simplify the painting of the dispersion composition. However, for manual application, the amount of water should not exceed 50 ml/litre. Firstly, a solution that is too thin will not allow you to create a continuous “fur coat”. Secondly, the sand will quickly settle at the bottom of the tank and it will have to be constantly mixed.

For soft bases, as well as spray application, dilution of the mixture with water in a ratio of 2: 1 is allowed. Alternatively, experts recommend using a different technology. It allows you to reduce the consumption of Betonokontakt by 1 m 2, but at the same time get a high-quality result. Processing is carried out in two layers:

• A mixture of Betokontakt and a deep penetration primer. For example, you can buy Tiefengrund from the same manufacturer Knauf - at a price it comes out three times cheaper.
• Betonokontakt in its purest form.

The application is always carried out in two layers with the time interval necessary for the complete drying of the base. It is easy to check the readiness of the surface for further finishing with your hands - as soon as the primer stops sticking, you can start working.

Price

Starting repairs, every good owner first of all calculates how much and what materials he needs. Of course, we are not talking about exact calculations, but in general terms it is desirable to imagine how much the repair will cost. The primer for concrete surfaces is used almost everywhere and the question of what is the consumption of concrete contact per 1m2 is of interest to many. In this article we will try to answer the most common questions regarding this type of soil.

What is this type of soil

Manufacturers, of course, keep the exact recipe of the composition secret and everyone has their own. But the general structure is something like this. The mixture has an acrylic base, quartz sand and, in some cases, cement are added to ensure good adhesion. All this binds, combines and enhances various polymer additives and additives.

If we move away from engineering terms, then the soil plays the role of butter on a sandwich. That is, it provides reliable adhesion of the plaster to the base. Its versatility also lies in the fact that the base does not have to be necessarily concrete. With the same success, it can be applied to paint, drywall and even old tiles, the main thing is that the base is strong.

A smooth and durable wall is quite difficult to plaster. In order for the composition to lie on the surface, it is necessary to make it rough, additives and quartz sand are responsible for this in the primer. After using concrete contact, the wall or ceiling becomes like sandpaper and almost any plaster composition will hold well on it.

If we talk about drywall, then in addition to enhancing the adhesive qualities, this type of soil also significantly strengthens the surface of the sheet. In addition, the primer is one of the few solutions that can easily cope with stubborn oil or other stains.

A big plus of the solution is its environmental neutrality. All elements included in the composition are odorless, this allows you to use it for both indoor and outdoor use. Acrylic also provides good vapor permeability of the walls. The only limitation can be considered the impossibility of working in the cold season, when the temperature drops below +5 ºС.

Ground work

The instruction states that any primer should be applied to a clean, dust-free surface if possible. As already mentioned, the temperature should be above +5 ºС. The solution is liquid, conductive, and it is advisable to de-energize the room before starting work.

The composition enters the distribution network in a ready-made form and does not require additional actions, except that it must be thoroughly mixed with your own hands before work. It contains sand, which has the peculiarity of settling, so it is necessary to mix not only before use, but also during operation.

Important: concrete contact can be applied with a foam roller, but professionals prefer to work with a brush, as it is easier to get into hard-to-reach places with a brush.
The use of a spray gun is allowed, but with a nozzle of the appropriate size.

In order for the primed surface to differ from the general background, the solution is tinted, as a rule, in pink. Drying time can vary from 2 to 4 hours, depending on the air temperature and the level of ventilation of the room.

Composition consumption

The consumption rate of concrete contact per 1 m2 depends more not on the type of base, but rather on its porosity, that is, on the ability to absorb moisture.

1. The porous material is characterized by high moisture absorption characteristics; 0.35 - 0.5 kg of soil is consumed on it. This includes pre-putty, sand concrete, building bricks and some types of natural stone. Before using concrete contact, these surfaces are recommended to be treated with some kind of deep penetration primer. If a tree is being processed, then an antiseptic is used.
2. Materials with medium porosity absorb moisture less and the consumption rate of concrete contact per 1 m2 is respectively lower, from 0.2 to 0.35 kg. These include monolithic blocks of high-grade concrete, most self-leveling floors, concrete tiles and some types of facing bricks.
3. The soil is especially valued for the possibility of processing low-porous and smooth surfaces, they consume approximately 0.15 - 0.25 kg per 1 m². These can be worn concrete monoliths, iron-clad or tile, old, ingrained paint, and even glass.

Tip: the quality of the treated surface is determined elementarily, after the composition has completely dried, visually the coating should be uniform and not have gaps.
Next, you need to draw a spatula along it, if the sand does not crumble, everything is fine, otherwise it should be covered again.

How to reduce the consumption of the composition

To put it simply, it doesn't. Experts do not even advise experimenting in this direction. The price of concrete contact is quite loyal and there is no need to try to remove the foam from those places where it is not customary to remove it, such attempts can cost more later.

At a minimum, the plaster layer can crack and lose its decent appearance, but it can also reach the complete peeling of the coating. This type of soil, in addition to the actual increase in adhesion, also has worthy waterproofing characteristics. And most plaster compositions and putties are diluted with water.

If the wet composition is applied to a poorly primed surface, the moisture from the solution is absorbed into the base and the hardening process stops, and shrinkage continues. As a result, the plaster layer cracks and falls off. The highly porous base literally sucks out water, and the concrete contact prevents this process.

Tip: sometimes you can meet "specialists" who recommend diluting the soil with water.
So, acrylic compounds do not dissolve with water, the soil simply becomes heterogeneous and in fact it will be damaged.

The video in this article provides additional tips on the topic.

Conclusion

As can be seen from the above data, the consumption of concrete contact per m2, taking into account the cost, is relatively small. Trying to save money, you risk running into repeated repairs. Few people can be satisfied with plaster that has cracked and fallen off in some places, in this case cosmetic measures cannot be dispensed with, it will be necessary to start the entire repair from scratch, and this will entail a double cost estimate.

One of the most popular construction tools with which a wide variety of materials are bonded is the primer Betonokontakt. This is a unique tool that allows you to reliably connect glass and ceramics, painted surfaces and plaster and other materials that at first glance do not connect.

What are the technical characteristics and features of the primer Betonokontakt?

The primer Betonokontakt has no analogues among materials for increasing adhesion. Due to the unique composition of acrylic with an admixture of cement and glue, the primer allows you to make a base similar to sandpaper from a smooth and slightly rough surface. Surface roughness is achieved through the use of quartz fine sand. On a smooth surface, finishing materials do not adhere well, therefore, the use of a primer allows you to prepare the basis for applying any finishing materials and maximize adhesion.

The primer has the following main characteristics, due to which it is considered indispensable:

1. 1. It can be used for all indoor surfaces: floors, walls and ceilings. Priming provides the strongest adhesion to the base, which allows the cladding to hold even in an upright position.
2. 2. It dries very quickly. After application, the surface dries in 2.5-4 hours, after which finishing work can be continued. When drying, the primer Betonokontakt does not emit unpleasant odors or harmful fumes into the air.
3. 3. It is moisture resistant. After application, it forms a dense film on the surface, which does not allow moisture to penetrate under the coating. The primer is often used for waterproofing floors and even in the construction of swimming pools.
4. 4. It is durable. Manufacturers claim that the treated surface will last up to 80 years (subject to application technology).
5. 5. Pigmentation of the mixture. Almost all soil mixtures from different manufacturers have pigment in their composition, mostly preference is given to a pale scarlet shade. When applying the emulsion to the surface, the pigment allows you to see the missing places.
6. 6. Convenience of application of the solution. Ready mix primer Betonokontakt has the consistency of sour cream and is easy to apply with a roller, spray, mechanical devices.

The primer can be used by specialists with extensive experience and beginners who want to independently carry out repairs in their apartment.

Application in construction - how long does the composition dry?

So, why do we need Betonokontakt? The mixture is used for interior work and for conservation of construction for the winter. The primer is not designed for very low and high temperatures. Do not neglect this nuance, since the applied layer will not perform its main functions. The primer is designed for those surfaces that cannot or poorly absorb moisture, and it is difficult to adhere a finishing finishing material to them.

For example, it is difficult to plaster monolithic slabs on the ceiling so that the coating does not crack or lag behind, and Betonokontakt solves this problem with a bang. It is applied to wood coatings, concrete, tiles, painted surfaces, metal to increase adhesion with the next layer of finishing material. The primer penetrates into large and small roughness of walls and floors and provides a high level of adhesion.

The period for which the composition dries depends primarily on the humidity in the room where the repair is being carried out. The standard drying time is 2.5-4 hours. But already an hour after application, it may seem that the layer has dried up. Don't rush! If you apply the next layer or finishing material on a wet primer, then the performance properties of Betonokontakt will deteriorate. It is best to work the surface in the evening, and continue finishing the base in the morning. It is also not worth leaving the dried surface for a long time, since dust can settle on it, and adhesion will be reduced.

In the case when it is impossible to avoid untimely subsequent processing of the base, before finishing it is necessary to additionally cover the surface with a primer with deep penetration and wait for the coating to dry completely. In areas such as a bathroom or lavatory where moisture levels are high, provide fresh air while the primer dries to draw out excess moisture. If it is not possible to organize ventilation of the room, then the drying period of the primer increases to a day.

Primer consumption per 1 m 2 - how to calculate?

Almost all manufacturers indicate the consumption of the emulsion at the rate of 300 grams per square meter, but this figure may differ radically from the actual consumption. You can determine how much emulsion is needed for surface treatment, based on the coating of the base. The higher the porosity of the coating, the more primer is needed to apply the layer. The surface can absorb moisture, in which case the primers will also have to be used more.

Consumption may vary on the following surfaces:

• Highly porous. These include concrete and brick. To process such surfaces, it will be necessary to use from 300 to 500 grams of the mixture per square meter, and the processing is carried out in several stages.
• Medium porous. Concrete tiles and high-quality concrete are classified as materials with medium porosity. In order to apply a small layer on the base, 200-350 grams of primer per square meter is enough.
• Low porous. Painted surfaces, reinforced concrete coatings, and ceramic tiles have low porosity. For these types of bases, the primer consumption is the lowest and amounts to 150-250 grams per 1m 2 for Betonokontakt.

On vertical surfaces, to which a heavy finish will be attached in the future, the consumption must be increased so that delamination does not occur under the weight of the finishing materials. Consumption of Betonokontakt can be calculated independently to determine how much is needed for processing. To do this, you need to take 1 kilogram of the mixture and prepare the tool with which the primer will be applied. The tool is weighed before use and the data is stored. Why do it?

After application, a certain amount of material remains on the tool, which must also be taken into account in the final calculation. Masking tape allocate 1 square meter. With the help of a tool, Betonokontakt is applied to the selected area so that the layer is uniform without gaps. After that, the rest of the emulsion and the dirty instrument are weighed. By calculating the difference between the data of the tools and the remaining mixture, you can determine the actual consumption of the primer. This method is the most effective, with its help you can avoid the purchase of excess material.

How to prepare surfaces for processing?

The surface must be thoroughly cleaned of dust and dirt before application, if it is a floor, then it must be vacuumed. If there are places on the surface that flake off or crumble, then it is better to remove them immediately, and plaster the irregularities with cement mortar. Priming is carried out after complete drying of the plaster. Betonokontakt does not stick to greasy surfaces, and if there are such areas, they need to be thoroughly washed, only after degreasing they start processing.

Places with paint before priming are washed with a damp sponge and after drying, Betonokontakt is applied. Surfaces that cannot be thoroughly cleaned are recommended to be pre-treated with an ordinary primer. This procedure will reduce material consumption, due to the fact that ordinary soil will fill large cracks and roughness. After processing, small blockages are removed, and Betonokontakt will adhere more strongly to the surface.

How to apply a primer, and what are the subtleties?

The application process is quite simple and does not require special instructions. Manufacturers on the packaging leave recommendations for use, do not ignore them. It is necessary to carefully read the recommendations for use, since some ready-made mixtures do not withstand low and very high temperatures, and if transportation is planned in the cold season, then the packaging must be protected from freezing. With strong heating and cooling, the adhesion properties decrease significantly.

Almost all mixtures are sold ready-made, they can be immediately applied to the prepared surface. After opening the bucket, be sure to mix the solution in the container. The mixture should resemble paint with very small grains. Before priming, it is necessary to ensure that the air temperature in the room is not lower than 15 degrees. In no case should you apply the emulsion to frozen walls. At low temperatures, the composition may not adhere to the surface and, after facing, under the weight of materials, lag behind the base.

If there is electrical wiring in the wall to be puttied, then turn off the power to the room at the time of work. This is due to the fact that the outgoing surface can absorb moisture and serve as a conductor for electricity.

To apply the emulsion, use a roller, wide brush or spatula. The lowest consumption of material is when applied with a wide brush (brush), as a large amount of the mixture remains on the construction roller. The primer is applied to the surface in an even layer, it is worth paying attention to the gaps. Thanks to the pigment in the composition of Betonokontakt, it is easy to see untreated areas. If the surface actively absorbs liquid, re-treat the area. The second layer is applied when the surface is uneven and with obvious defects.

When mechanically applying the primer, it can be diluted with a little water. To do this, we use the proportion: for 1 kilogram of the mixture 50 ml of water at room temperature. After drying, proceed to the lining. The faster the final work on the wall is carried out, the greater the adhesion will be between the hard coating and the facing material. The characteristics of the primer Betonokontakt make it possible to process bases in a residential area. This material is considered environmentally friendly, it does not emit chemical elements and harmful fumes into the air, therefore, even when priming, it is not necessary to use protective masks or suits. After work, ventilate the apartment.

Smooth substrates are characterized by minimal moisture absorption and insufficient adhesion, due to which attempts to glue, paint, finish with putty / plaster end in failure. In order to improve adhesion, professionals recommend using a special composition.

Betonkontakt is an alkali-resistant polymer dispersion belonging to the class of primers. The ability of the material to transform perfectly smooth surfaces into rough ones, thereby improving the adhesive properties of the base, makes it indispensable when working with tiles, monolithic concrete blocks, drywall, wood, glass, metal, coatings treated with oil / alkyd paint. Such qualities are due to the presence of:

• finely dispersed filler - quartz sand, the particle size of which does not exceed 600 microns (it is he who gives the surface a certain texture);
• thermoplastic polymer - acrylic (plays the role of a connecting element);
• high-strength adhesive (to ensure a reliable connection with the treated coatings);
• cement (acts both as a binder and as a roughness builder);
• other compatible ingredients that vary depending on the manufacturer.

These components generate additional primer abilities:

• waterproof the surface, forming a waterproof film on it;
• dry quickly (in a couple of hours), after which it is permissible to proceed with further work;
• pass gases, thereby creating natural air circulation in the room and preventing the occurrence of mold;
• for 70-80 years not to lose useful properties.

The consumption of concrete contact is relatively small: 200-400 g per 1 m2. Visually it is allowed to follow the uniformity of the coating, which is possible due to the inclusion of color additives (usually pink dye) in the composition.

Since the concrete-contact primer acts as a connecting element between the finishing material and a smooth base, it is rightfully considered the best option for preparing walls, ceilings, and floors. If you use a dispersion under the screed, then there is no need for its waterproofing.

Overview of the best popular primer brands

In terms of purpose and principle of operation, they are all approximately the same. The difference lies only in the minor components that manufacturers add in order to improve the quality of their product, distinguish it from the general mass and advance to the leaders. The brands most in demand today are:

• Birss;
• Dali;
• TEX;
• Knauf.

1. Birss concrete primer has established itself as a good building material of domestic manufacture. Its release is carried out in plastic buckets with a reliable metal handle with a volume of 10 and 20 kg. Having a water-dispersion base with the addition of finely calibrated fillers, it contributes not only to the creation of a developed rough surface with excellent adhesion, but also to stabilization of the coating due to the elimination of microdefects.

• Color of the formed film: transparent, opaque.
• Consumption: 300-350 gr/m2.
• Application temperature: +5 to +35°C.

2. Adhesive acrylic Dali is another creation of Russian manufacturers. You can buy in 3 weight options: a bucket with a capacity of 3.5, 6 and 12 kg. Dali is based on modified acrylic copolymers, quartz filler, special additives and an antiseptic that actively prevents the appearance of fungus and mold.

• Color: pinkish
• Consumption: 1 liter per 3-5 m2.
• Temperature: from +10 to +35 °C.

3. The company TEKS (Russia) has been producing good products both in terms of quality and price for a long time. Concrete contact for processing large surfaces is best purchased in buckets of 6, 12, 18 kg. TEX Universal 3 kg is an excellent solution for small bases. The main ingredient is a copolymer acrylic dispersion, and technological additives and fillers improve the properties. It can be used for both indoor and outdoor work.

• Film color: colorless.
• Consumption: 5-7 m2/kg. (7-9 m2/l).
• Temperature: +5 to +35°C.

4. Primers from Knauf (Germany) are often purchased by craftsmen, as they meet all the parameters for a professional finish. In the manufacture of concrete contact, the manufacturer uses exclusively screened quartz sand, the fractions of which are of 2 types: 0.3 and 0.6 mm. The first variation is ideal for processing the base before puttying, sticky wallpaper, painting. The second type is better to prefer before plastering. Available in plastic buckets weighing 5 and 20 kg.

• Color: light pink.
• Consumption: 0.2-0.35 kg/m2.
• Temperature: +5 to +25°C.

How to apply the composition?

Proper use of concrete-contact means:

• preliminary cleaning of the surface;
• mixing the solution in order to raise heavy particles (sand, cement) and balance the composition;
• applying a primer with a brush or roller in one layer (a second layer is necessary if the coating is uneven);
• waiting for complete drying to ensure maximum adhesion and continue finishing.

For most people, the word "repair" is unlikely to cause at least some positive emotions. Usually this process is associated with huge expenses: effort, money and time.

One of those tasks that sometimes cause torment even for people with repair experience, albeit not professionals, is the need to increase adhesion certain materials. This is where the concrete contact primer will help.

What is concretecontact?

If you inexperienced builder., then you are probably hearing this word for the first time, so we should figure out what kind of substance it is.

Betonokontakt - this is a special type of primer that can turn absolutely any surface from perfectly smooth to as rough as necessary.

It consists of a very strong adhesive, as well as acrylic and quartz sand. Apply concrete contact for outdoor and indoor work. The main producers of this material are Knauf, Prospectors, Master.

Advantages and disadvantages

For this type of primer, as for any material has its pros and cons. Let's consider them in more detail.

Advantages:

Perhaps you will find useful information on how to prime the walls under the wallpaper. Read this one.

Disadvantages:

1. You cannot store this material in the cold because it will lose its properties.
2. If applied incorrectly, it will not fulfill its basic properties.

Consumption rates

Despite the fact that the name of this material contains the word "concrete", Concrete contact can be used on completely different surfaces.

Accordingly, the rate of its consumption will be completely different. It depends primarily on the porosity of the surface. on which you apply it.

And although the easiest and most reliable way to determine the consumption rate of concrete contact is simply apply it to the part of the desired surface, with an area of ​​​​a square meter, let's still consider the approximate consumption rate of this material.

1. On highly porous surfaces such as concrete slabs, bricks or special porous stones, you should apply 0.5 kg per 1 m2.
2. For medium density materials such as concrete block or concrete slab, you will need to 0.3 kg per 1 m2.
3. Low-porous surfaces (ceramics, tiles) will require not less than 0.15 kg concrete contact per 1 m2.

Do-it-yourself primer application

To get started you need clean the surface of debris and dirt, dust and everything else. Next, you will need a roller or brush.

It is necessary to carefully place the concrete contact in the tank and apply it with a roller uniform thin layer on the wall. Corners and hard-to-reach places are primed with a brush.

When performing work, you need to monitor the temperature in the room. She shouldn't be below +5 °C.

Now the main work is done and you can relax a bit. You have to wait until the concretecontact completely dry. This is very important, because if it is even a little wet, it will significantly reduce the quality of adhesion.

Complete drying of the concrete contact occurs as a rule after 5-6 hours. After this time, you can proceed to further finishing.

It is forbidden tighten with continued finishing work, because after more than two days the surface will dry out and become dirty.

Now that you have learned about this wonderful type of primer, your repair will be easy and pleasant.

Video review of the concrete contact primer.