When starting a repair, every good owner first of all calculates how much and what materials he needs. This, of course, is not about accurate calculations, but in general terms, it is desirable to understand how much the repair will cost. The primer for concrete surfaces is used almost everywhere and the question of how much 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 a secret and each has its own. But the general structure is approximately as follows. The mixture has an acrylic base, to ensure good adhesion, quartz sand and, in some cases, cement are added. All this binds, combines and enhances various polymer additives and additives.
If you move away from engineering terms, the soil plays the role of butter on a sandwich. That is, it provides a reliable adhesion of the plaster to the base. Its versatility is that the base must necessarily be concrete. With the same success it can be applied to paint, drywall and even old tile, the main thing that the base was strong.
Smooth and durable wall hard enough plastering. To lay down on the surface, it is necessary to make it rough, for this in the primer correspond additives and quartz sand. After using concrete contact, the wall or ceiling becomes similar to sandpaper and on it, almost any plaster composition will hold well.
If we talk about gypsum plasterboard, then besides strengthening 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 easily cope with stubborn oil or other stains.
The great advantage of the solution is its environmental neutrality. All the elements included in the composition are odorless, it allows you to use it for both internal and external works. Another acrylic provides good vapor permeability of the walls. The only limitation is the inability to work in the cold season, when the temperature drops below +5? С.
Work with soil
The instruction states that any soil should be applied on a clean, as far as possible, dust-free surface. As already mentioned, the temperature should be above +5? С. The solution is liquid, conductive and preferably before work to de-energize the room.
The composition enters the sales network in a ready-made form and does not require additional actions, except that it must be thoroughly mixed by hand before work. There is sand in it, which has a peculiarity of settling, therefore it is necessary to mix not only before use, but also in the process of work.
Important: it is possible to apply concrete contact with a foam roller, but professionals prefer to work as a maklovitsa, as it is easier to get into the hard-to-reach places with a brush. Using the spray gun is allowed, but with a nozzle of the appropriate size.
In order the primed surface differed on the general background, the solution is tinted, as a rule, in pink color. Drying time can vary from 2 to 4 hours, depending on the air temperature and the level of room ventilation.
The consumption rate of concrete contact for 1 m2 does not depend more on the type of base, but rather on its porosity, that is, on its ability to absorb moisture.
Next, we present the averaged data obtained experimentally.
- Porous material is characterized by high characteristics of moisture absorption, soil consumes 0.35 - 0.5 kg.. These include pre-polished concrete, solid putty, sand concrete, building bricks and some types of natural stone. These surfaces before using concrete contact, it is recommended to treat any soil of deep penetration. If the wood is processed, an antiseptic is applied.
- Materials with an average porosity absorb less moisture and the consumption rate of concrete contact is 1 m2, respectively, lower, from 0.2 to 0.35 kg. These include monolithic blocks of high-grade concrete, the majority of self-leveling floors, tiles made of concrete and some types of facing bricks.
- Soil is especially valued for the possibility of processing low-porous and smooth surfaces, they consume about 0.15 - 0.25 kg per 1m?. It can be worn out concrete monoliths, iron concrete screed, ceramic or tile, old ingrained paint and even glass.
Tip: the quality of the treated surface is determined by the elementary, after the composition is completely dry, visually the coating should be uniform and not have a gap. Next, you need to hold it with a spatula, if the sand is not showered, everything is fine, otherwise you should cover it again.
How to reduce the consumption of the composition
If you say simply - it does. Experts do not recommend even experimenting in this direction. The price of concrete contact is quite loyal and there is no need to try to remove the foam from the places from which it is not accepted to remove it, such attempts can be more expensive later.
At a minimum, the plastering layer can crack and lose a decent look, but it can even go to complete delamination of the coating. This type of soil, in addition to the actual increase in adhesion, also has decent waterproofing characteristics. And most of the plaster compositions and fillers diluted with water.
If the wet composition is applied to a poorly primed surface, moisture from the solution is absorbed into the substrate and the curing process stops, and the shrinkage continues. As a result, the plastering layer cracks and falls off. Highly porous base literally sucks water, and concrete contact prevents this process.
Tip: sometimes you can find "experts" who recommend diluting the soil with water. So, acrylic compounds do not dissolve in water, the ground just becomes non-uniform and in fact it will be damaged.
The video in this article provides additional tips on the topic.
As can be seen from the above data, the consumption of concrete contact per m2, considering the cost, is relatively small. Trying to save money, you run the risk of running into a re-repair. Few people can make cracked and crumbling plaster, in this case, cosmetic measures can not do, you will need to start all repairs from scratch, and this would entail a double cost estimate.