Purchasing a mixture for self-leveling floor in a large construction hypermarket it often becomes a compromise between the desire to save money and the need to get a high-quality result, especially when there are dozens of bags on the shelves with similar names, but radically different chemical bases. The wrong choice of material, for example, using a gypsum mixture in a damp room or trying to equalize differences of 5 cm with a composition limited to 10 mm, leads to peeling of the coating and wasted budget, so it is critical to understand the technical characteristics of each product before visiting the store.
Network assortment Leroy Merlin offers solutions from budget domestic brands to professional European lines, and the key task of the buyer is not just to find a product in stock, but to select a composition that is compatible with a specific type of base and the planned topcoat. In this article, we will analyze in detail what types of levelers are available on the shelves, how to calculate the required number of bags without buying excess material, and what brands you should pay close attention to when creating a repair estimate.
Classification of mixtures: what is actually on the shelves
The main division of leveling products occurs according to the type of binder, and it is this parameter that determines the scope of the material, its cost and operating requirements. The most widely represented in the hypermarket catalog plaster and cement compositions, each of which has unique physical and chemical properties that dictate the conditions for their use in residential or commercial interiors.
Gypsum mixtures, such as popular lines Volma or Knauf, are characterized by a high drying speed and lack of shrinkage, which makes them ideal for living rooms, bedrooms and living rooms where there is no direct contact with water. Cement analogues, often labeled as “universal” or “for wet rooms,” take longer to dry, may exhibit minimal shrinkage, but have high moisture resistance and strength, making it possible to lay ceramic tiles over them in bathrooms or pour a finishing layer in garages.
A separate category consists of polymer and epoxy compounds, which are less common in ordinary construction stores and are most often presented in the form of two-component kits for creating decorative 3D floors. These materials require professional preparation of the base and strict adherence to the technology of mixing the components, since an error in proportions can lead to the floor remaining sticky forever.
⚠️ Attention: Never use gypsum self-leveling floors in bathrooms or on open balconies, even if the manufacturer claims to have moisture-proof additives, since the gypsum will inevitably lose its strength if it comes into direct contact with water.
Hidden markings on bags
Pay attention to the color of the stripes or logos on the bags: green often signifies moisture resistance, blue indicates standard dry area use, and red indicates extra strength or a quick-drying formula.
Review of popular brands and their features
When choosing a specific product in the department of dry construction mixtures, the buyer is faced with a wide range of brands, among which the leading positions are occupied by Hercules, Prospectors, Ceresit and Bergauf. Each of these brands positions its products in different price segments, offering solutions both for rough leveling of large differences, and for finishing the creation of a perfectly smooth surface under linoleum or quartz vinyl.
The budget segment, represented by brands like Hercules or Founds, attracts with its low price per bag, which is critical when leveling large areas in new buildings or warehouses. However, it is important to understand that saving on material may require more careful preparation of the substrate and the use of more primer to ensure proper adhesion and prevent the formation of cracks when drying.
Medium and high price segment, including products Ceresit, Knauf and Bergauf Express, offers improved rheological properties, meaning the mixture flows better, self-levels and requires less effort to remove air bubbles with a needle roller. Professionals often choose these brands for the predictability of the result and exact compliance with the stated lifetime of the solution, which allows them to work at a comfortable pace.
Technology for preparing the base before pouring
The quality of the final coating depends 90% on how competently the preparation of the subfloor was carried out, since any dust, oil stain or unstable area can become a point of delamination of the entire screed. Before purchasing bags in Leroy Merlin it is necessary to carry out troubleshooting of the base: identify cracks that need to be expanded and repaired, and determine height differences using a long rule or a laser level.
The critical step is application. primers, which binds residual dust, reduces the absorbency of the base and prevents too rapid dehydration of the self-leveling floor. If you skip this step or use a primer that is not appropriate for the type of mixture (for example, a weak one for a powerful cement screed), the solution may “boil” or dry unevenly, forming a crust and leaving the bottom damp.
To compensate for thermal expansion and prevent cracking along the walls, it is necessary to glue damper tape, which creates an elastic seam between the screed and vertical structures. Ignoring this requirement leads to the fact that when the material dries and expands, it rests against the walls, bulges in the center of the room, or cracks in the weakest places.
☑️ Floor preparation checklist
Calculation of consumption and financial costs
The financial component of the repair often becomes a decisive factor, and in order to avoid a situation where one bag is missing and there is no time to go to the store again, an accurate calculation of materials is necessary. The consumption of dry mixtures varies depending on the density of the composition and usually ranges from 1.3 to 1.6 kg per square meter with a layer thickness of 1 mm, but this data should always be double-checked on the packaging of a particular product.
When planning your budget, you should take into account not only the cost of the self-leveling floor itself, but also related products: deep penetration primer, beacons, damper tape and rental of tools if you don’t have your own mixer or needle roller. Often in Leroy Merlin There are kits or discounts when purchasing the entire volume at once, which allows you to save up to 10-15% of the total check amount.
Below is a comparative table of the approximate consumption of popular mixtures to understand the difference in costs when leveling a standard room with an area of 20 m² with a layer of 10 mm:
| Brand and type of mixture | Consumption per 1 m² (1 mm layer) | Bag weight | Approximate price per bag |
|---|---|---|---|
| Hercules (Gypsum) | 1.35 kg | 20 kg | 350-400 rub. |
| Ceresit CN 175 (Cement) | 1.6 kg | 25 kg | 600-700 rub. |
| Knauf Tribon (Combined) | 1.4 kg | 20 kg | 450-500 rub. |
| Bergauf Express (Quick dry) | 1.5 kg | 20 kg | 550-600 rub. |
Therefore, when purchasing material, always round up the resulting number of bags and take one additional bag in reserve.
Pouring process and drying time
The pouring process itself is the most dynamic stage of the work, requiring the coordinated actions of at least two people: one mixes the solution, the other distributes it and expels the air with a needle roller. The viability of most ready-made mixtures is from 20 to 40 minutes, after which the solution begins to thicken, and adding water to thin it is strictly prohibited, as this destroys the structure of the material.
The time for complete drying depends on the thickness of the layer, room temperature and humidity, and if you can walk on a gypsum floor after 4-6 hours, then laying the topcoat (laminate, linoleum) is possible only after 3-7 days. Cement screeds take longer to dry - up to 14-28 days, and it is impossible to force this process by turning on a heated floor or drafts, otherwise the surface will be covered with a network of cracks.
To control the readiness of the base for laying the finishing coating, experts use a moisture meter, but at home you can use a simple method: tape a 1x1 meter square of plastic film to the floor and leave it overnight. If in the morning condensation appears under the film or the base underneath it darkens, it means that there is still a lot of moisture in the screed and you need to wait.
⚠️ Attention: Drafts and direct sunlight during the drying process of the self-leveling floor are unacceptable, as they cause uneven evaporation of moisture and are guaranteed to lead to deformation and cracks.
Use warm water (30-40°C) to mix the mixture in a cold room, this will improve the spreadability of the solution, but do not use hot water as it will speed up the setting.
Common mistakes when purchasing and installing
One of the most common mistakes is buying an expired mixture, which can often be found on sales in construction hypermarkets at a reduced price. Gypsum and cement are hygroscopic materials, and even with a whole package, after a year of storage in a warehouse, moisture could partially react with the binder, which would lead to a loss of strength and the finished floor crumbling into dust.
Another common problem is a violation of the proportions of water during mixing, when masters pour water “by eye”, trying to make the solution more liquid for better spreading. Excess water leads to stratification of the mixture: the heavy fraction settles down, and a weak, chalking layer is formed on the surface, which will not withstand the load from the furniture and will quickly collapse.
It is also worth mentioning the mistake of saving on tools: using a regular household mixer for a drill instead of a professional one, or working with a cheap needle roller with plastic needles that bend quickly and do not penetrate the thickness of the solution. A high-quality tool is not that expensive, but it guarantees the removal of air bubbles, which would otherwise turn into craters on the surface of a dry floor.
The main secret to success: strictly follow the instructions on the package regarding the amount of water and mixing time, without trying to improve the recipe with your own methods.
Questions and answers (FAQ)
Is it possible to pour a self-leveling floor over old linoleum?
It is strictly not recommended to pour a self-leveling floor directly on top of linoleum, since adhesion (adhesion) will be extremely low. Linoleum is a floating coating that can be deformed under the weight of the screed, and the adhesive base can enter into a chemical reaction with the components of the mixture. The old coating must be dismantled, the base cleaned and only then leveling can begin.
What air temperature should be maintained in the room?
The optimal temperature range for working with self-leveling floors is from +5°C to +25°C. At temperatures below +5°C, the hydration processes of cement or gypsum slow down or stop, which leads to a loss of strength. At temperatures above +25°C, water from the solution evaporates too quickly, without having time to react, which causes cracking.
Is it necessary to reinforce the self-leveling floor with mesh?
In most cases, when pouring thin-layer finishing floors (up to 10 mm), reinforcement is not required. If a thick-layer screed (more than 50 mm) is planned or the base has cracks, it is recommended to use fiberglass fiber added to the mixture, or lay a metal/fiberglass mesh to prevent cracking of the array.
How long before you can lay tiles on a self-leveling floor?
Laying ceramic tiles is possible after the base has fully gained strength and dried. For gypsum mixtures this period is 3-5 days, for cement mixtures - from 7 to 14 days, depending on the thickness of the layer and the humidity in the room. Before laying, be sure to check the moisture content of the base with a moisture meter.