Recently, in private and industrial construction, the use of self-leveling mixtures has become popular , which help to quickly and efficiently level the concrete screed. On the shelves of construction stores you can see the compositions of various manufacturers, however, the most trusting consumer was the leveling mixture Ceresit CN 175. What properties it has, where it can be used and how to properly level the surface with it, we will tell in this article.
Product Description
Dry mix Ceresit CN 175 It is an astringent with various mineral additives, designed to equip a rough floor for laying a decorative coating. It fills gaps and grooves well, evens out the structure of the base and brings it to the same level. Its use is possible with both manual and mechanical application to the surface.
The bulk floor "Ceresite" is characterized by excellent adhesion with mineral compounds, it fits well on asbestos boards, drywall and cement-sand screed.
Products of this brand are used to equip the base for linoleum, laminate, parquet, ceramic tile or carpet. The mixture is also suitable for the repair of old cracked concrete floors and can be used as a screed for underfloor heating, hydro and thermal insulation.
Key material specifications
The bulk floor "Ceresite" (CN 175) has the following technical characteristics:
- The setting time of the mixture is 30 minutes.
- After 28 days (from the moment of pouring the mixture), the strength of the base reaches 4 MPa.
- Exploitation of floors is possible no earlier than 6-7 days after surface solidification.
- Pouring the solution should be carried out at a temperature of +5 to +30 degrees.
- The maximum allowable temperature during operation of the floors is +70 degrees.
- 4.5-4.8 liters of water are consumed per bag of dry mix (weighing 25 kg).
- 1.6 mm of dry material (per square meter) is spent per 1 mm of the leveling layer thickness.
- The maximum humidity indicator in the room (in the process of pouring the mixture) should be no more than 80%.
Advantages and disadvantages of bulk floors "Ceresit"
In the liquid state, the Cerezit bulk floor quickly spreads, penetrates the slightest cracks and grooves, forming an even and monolithic base. A specially selected composition of components hardens very quickly, so that the repair process does not need to be stopped.
Since the thickness of the leveling layer is minimal, its presence does not particularly affect the height of the ceilings in the room.
In addition, the above advantages include:
- wear resistance;
- complete absence of shrinkage;
- the possibility of use in underfloor heating systems;
- resistance to cracking;
- environmental friendliness;
- ease of application;
- high hardness.
If we talk about the shortcomings of this material, it should be noted that the Cerezit bulk floor (CN 175) can be used only indoors, since the drying mixture does not like drafts and high humidity. Neglect of these requirements leads to the fact that the surface begins to delaminate and become covered with cracks.
Do not forget about the quick setting. All work on the distribution of the diluted composition should be carried out within the first 30 minutes, and these requirements cause discomfort to some masters.
Also, in the process of work, it is necessary to strictly adhere to the technology of pouring the leveling layer, otherwise the floor level may not be displayed perfectly smoothly. Therefore, let's look at how to work with this material.
Foundation preparation
Before pouring the mixture “Ceresit” (bulk floor 175 markings), due attention should be paid to the preparation of the base. This process involves the following work:
- A thorough screed study to identify all defects. Particular attention should be paid to the size of the differences on its surface, since the difference between the minimum and maximum heights should be within 3 mm.
- Further, using a metal brush or a vacuum cleaner, the floors are cleaned of various contaminants, debris and dust.
- A clean base is treated with a deep penetration primer and allowed to dry.
- A special tape or waterproofing material is glued around the perimeter of the room (to protect the walls from pollution).
To prevent the mixture from leaking out of the room, a sill is installed at the outlet (which can be built from improvised materials and covered with a waterproofing film). After that, you can start pouring the mixture.
Pouring a self-leveling mixture
The technology for filling the bulk floor is divided into two main stages:
- Preparation of the solution. Pour water into a clean container and pour the dry mixture, strictly adhering to the manufacturer's instructions. Kneading can be done manually or using a drill with a mixer nozzle. Mix the solution until lumps and air bubbles completely disappear in it.
- Pouring the mixture . The finished solution begins to pour from the far corner of the room, gradually moving to the exit. The mixture is poured in small parts, from one wall to another (strip width about 40 cm). Using a wide spatula, each strip is evenly distributed along the base, paying particular attention to corners and hard-to-reach spots.
When the entire surface is flooded with a leveling mortar, a needle roller (in special shoes with a needle sole) is passed over it. This is necessary in order to get rid of air bubbles and ensure good adhesion. After this, the floors are left to dry.
At the end of the topic, I would like to voice how much "Ceresit" (bulk floor) costs. The price for one bag of dry mix (weighing 25 kg) varies between 350-450 rubles and depends on the volume of purchase.
We hope that our article has provided comprehensive answers to all your questions. Easy repair for you!