How to calculate the consumption of the mixture for the floor screed. Cement-sand mixture: consumption per m2, composition and proportions

We calculate the amount of sand concrete that you need for the floor screed:

1. We indicate the quantity square meters floor.

2. We indicate the thickness of the screed in mm.

3. The received quantity of kilograms of sand concrete is divided by 40 or 50 kg depending on the volume of 1 bag and we get the number of bags that you need to purchase.

Floor area (m2):

Screed thickness (mm):

Amount of sand concrete (kg):

The sand concrete calculator allows you to calculate the amount of dry mix for a semi-dry floor screed.

Floor screed is one of the final elements finishing worksrelated to gender. After it has been carried out, the floor can be covered with the final material (laminate, linoleum, tiles, carpet, etc.). The screed is carried out in order to eliminate all unevenness of the floor surface and prepare for the final finishing.

The main material used for floor screed is a mixture of concrete and sand. To carry out successful work on a large area, you will need several bags of sand concrete.

Of course, when you plan repair work, it is important that the amount of material is ideal: so that you do not have to buy additionally what was not enough, and so that there is no excess left, which you cannot then use in another area.

In order not to buy less and at the same time not to spend money on extra material, you can use the sand concrete calculator for the floor screed.

The area covered by the screed (in square meters);
The thickness of the screed layer (in millimeters).

The calculator multiplies the area of \u200b\u200bthe object by the thickness of the floor screed and gives you the result of how many kilograms of sand concrete you need to cover your floor. And then you should divide the resulting result either by forty or fifty kilograms, depending on what volume bags you will buy sand concrete in. The resulting value will be the number of sand concrete bags you need.

Important! It is not worth buying the exact amount of material calculated by the calculator. When carrying out work, there may always be some errors, so it is best to take the material with a small margin.

Sand concrete is a frost-resistant and durable material that is often used in construction to equip a sub-floor. In terms of its physical and mechanical properties, the material is similar to a conventional cement screed. However, it contains various plasticizers and modifying agents that significantly improve specifications screeds: mechanical and chemical resistance, frost resistance, density, etc.

What is sand concrete?

If you need to equip a rough base with your own hands, the question often arises: what material to use to fill the screed? Traditional cement-sand mortars are inexpensive, however, if a decent mechanical load is applied to the coating, they begin to crack. A liquid mixture of sand concrete is devoid of such disadvantages. What is it?

Sand concrete is a special composition that includes the following components:

• portland cement;
• synthetic substances (plasticizers, pigments);
• sand.

The above substances affect not only the consistency of the solution, but also the durability of the screed itself. Depending on the fraction of sand that is included in the mixture, sand cement can be classified as fine and coarse-grained concrete.

Analysis of the composition of sand concrete

In the process of finishing the rough floor with your own hands, you need to take into account many characteristics of the coating:

• the presence of temperature differences in the room;
• intensity of floor exploitation;
• indoor humidity level;
• type of foundation or floor (presence of a basement).

When arranging foundations in rooms with a specific microclimate, you should not use an ordinary cement screed. Why? The formed coating has high hygroscopicity and capillarity, therefore moisture freely penetrates deep into the base and destroys the reinforcing mesh. Over time, this affects the integrity of the sub-floor and finish floor.

What is the best material to choose in this case? As practice shows, sand concrete has good moisture and frost resistance. You can not discount the insignificant consumption of the material itself, which is due to the high plasticity and fluidity of the solution. However, the technical characteristics of the sand-cement composition are influenced by the concentration and presence of individual components.

But no matter what mixture you choose for the subfloor, it will definitely include the following substances:

• granite screening;
• fine or coarse sand;
• portland cement.

However, the technical characteristics of the screed are influenced by the additives included in the mixture, which include:

• plasticizers;
• antibacterial substances;
• retarders and accelerators of the screed hardening process.

What is the best sand concrete to choose in this case? The variety of the selected composition directly depends on the conditions of use. In the process of pouring the solution onto a small base area, it is more expedient to give preference to solutions with a fast solidification period. If it is necessary to equip a sub-floor of a larger area, it is better to opt for compositions with a long curing period.

Advantages and disadvantages of sand concrete materials

When repairing a floor with your own hands, not everyone understands what criteria should be used to choose a mixture for applying a screed. But experienced craftsmen choose sand concrete due to the presence of such advantages:

1. Simplicity of solution preparation;
2. Long service life of the screed;
3. Resistance to corrosive processes;
4. Resistance to temperature extremes;
5. Good sound and heat insulating qualities;
6. High frost resistance.

Important! The quality of sand concrete compositions is influenced not only by the amount of additional ingredients, but also by the brand of cement used. When choosing a material with your own hands, it is worth knowing about the presence of several disadvantages of special screeds, namely:

• The price of sand concrete mixtures is higher than ordinary cement ones;
• If the sequence of mixing the components of the mixture is not followed, the technical characteristics of the subfloor may significantly deteriorate;
• When diluting a solution with your own hands, without the presence of special devices, it is difficult to track the degree of its homogeneity.

Varieties of sand concrete

As already noted, sand concrete can be of several types and on its technical specifications it is the brand of cement that affects to a greater extent. For the production of material, cement of the following grades can be used:

• М150 - used for the implementation of masonry works: elimination of defects on the base, leveling the floor or laying facing materials;
• M200 - suitable for arranging screeds indoors;
• M300 - used for the preparation of concrete castings, arrangement of a rough screed or foundation;
• M500 is the best of all the above types of sand cement, which is suitable for most masonry work.

It should be noted that the price of M500 grade cement is quite high and therefore it is rarely used in the process of laying the screed. But the M300, in terms of its physical and mechanical characteristics, is not inferior to high-quality material, but it costs much less.

Features of sand concrete M300

A sand-cement screed from a mixture, which includes M300 cement, is most often used by builders when arranging a rough base. The increased interest in mortar is due to good technical parameters:

• High density of the prepared solution;
• The ability to use the mixture for internal and external work;
• Resistant to precipitation and low temperatures;
• The ability of the composition to self-level;
• Fast hardening of the screed at positive temperatures.

It should also be noted that the price of M300 sand-cement mortars is low, so even a significant consumption of material does not contribute to large financial expenses.

Calculation of the amount of mixture

Payment the required amount sand concrete is produced according to the following scheme:

1. First, the calculation of the base area is done;
2. Then the degree of the height difference per m2 of the base is calculated;
3. After that, according to a certain formula, the consumption of the sand-cement composition is calculated.

• Let's say that we need to fill 30 m 2 of the base with sand-cement with our own hands;
• The material consumption is mainly influenced by the thickness of the screed, let's say that it is 4 cm;
• When calculating the required number of bags of sand concrete, on the packaging they look at the specific consumption of the prepared solution per m2 of the coating with a layer thickness of 1 cm. Let's say that it is about 20 kg;
• To calculate the amount of the composition, we make the following calculation: we multiply the layer thickness by the specific consumption: 4 * 20 \u003d 80 kg;
• Now, in order to find out the amount of material for pouring the entire floor (30 m 2), you need to multiply the resulting value by the total area of \u200b\u200bthe base: 80 * 30 \u003d 2400 kg.

So, the consumption of sand-cement mortar for arranging a floor with an area of \u200b\u200b30 m 2 will be 2400 kg. Now you need to determine the number of required bags of the mixture:

• As a rule, the construction composition is packed in bags of 20, 30 or 50 kg. Let's say we need to buy a mixture in 30 kg bags;
• How many bags are required? The calculation is made in accordance with the formula: divide the total weight of the required amount of the composition by the weight of one bag;
• Using the calculator, we make a simple calculation: 2400/30 \u003d 80 bags.

Online calculator for calculations

Since the sand concrete mixture may contain various plasticizers and additives, they can significantly affect the consumption of the prepared composition. In order not to engage in laborious calculations, to quickly determine the required amount of material, you can use online calculator... Thanks to an ingenious program, not only the consumption, but also the price of the required amount of sand cement is easily determined.

roll up

Quite often, the arrangement of the screed on the floor with the pouring of the base is carried out by people who do not have a building education. In this case, it is very important to consider what the cement consumption for the screed will be equal to. The correct calculation will save money, since the loss of materials should be minimal, plus the floor surface is laid in such a way that it could withstand all the loads. In cases where there is too little cement per m2, the screed will crumble, and if there is an excessive amount of materials, the financial costs will increase significantly, but the strength of the base will increase significantly.

Characteristics

Use a mixture of cement and sand to perfectly level the floor or other surfaces - optimal solution both to save the budget and for convenient holding renovation works at home. Calculation of the composition of the screed: ingredients and consistency, as well as the consumption of materials used per 1m2 (cement, sand) must be carefully planned before starting work on the preparation of the mixture.

If the calculation is made accurately, this will allow not only to give the floor surface the highest possible strength, but also a long service life. When making inaccuracies in quantitative ratios per m2, cracks, chips may appear, after the cement and sand screed has completely dried.

Carrying out floor measurements for further calculations

The correct calculation, which determines the consumption of cement for the screed, primarily depends on the measurements of the floor and the records of the final results (per m2). The room in which it is planned must be freed from unnecessary building materials and rubbish. The floor surface is, accordingly, clean, dust-free. The initial step in measuring the floor (unit of measurement - m2) should be the determination of the zero level - a mark anywhere in the room. Using a laser tool or spirit level, all walls of the room are marked from the selected point.

All marks are connected by one straight line. The difference between these two parameters is the level of the height difference, which should not be more than 5 cm.At the highest point of the room made of cement and sand, the minimum indicator is at least 0.8 cm. A mismatch will cause the floor surface to crack and crumble.

Calculation of cement per m2: formulas

There is no general calculation formula that would allow to determine the consumption of the mixture for the floor per 1m2 with maximum accuracy and correctness. Each repair worker applies his own calculation system, which makes it possible to determine the necessary proportions of materials used for screed, proven in practice. If the room in which the screed is planned is residential, then the calculation is better based on the proportion - 1 to 3 (1 part of cement to 3 parts of sand). It is recommended to use the brand of cement, the amount of water for the solution is 0.5 liters. An excessive amount of liquid can negatively affect the quality of the final M200 brand floor mix.

The consumption of a cement-sand mixture for a particular room taken can be calculated as follows: the required volume is equal to the product of the values:

• the length of the room;
• the thickness of the future coating;
• the width of the room.

When arranging a screed made of cement and sand, another 20% must be added to the obtained value (in m2). This parameter indicates shrinkage when the solution solidifies. If finished products (packaged) are used for screed, then be sure to read the instructions on the package. Usually, the most accurate data and calculation of the building material are indicated. In most cases, the approximate flow rate is equal to the interval from 14 to 21 kg per 1 m2 of space. These numbers are valid for the selected layer thickness of 1 cm.

With a layer thickness exceeding 1 cm, the calculation is carried out according to a different scheme:

• the volume is calculated (the product of the length, width and thickness of the layer);
• the volume value in the calculation is transferred into the expression obtained from the proportion: the required amount of kilogram \u003d the obtained volume multiplied by the number 490 (the number of kg in 1 cubic meter) and divided by 50 kg (the mass of a standard bag of cement-sand mixture).

It is very convenient to use a table of cement consumption, taking into account its grade and solution:

Cement, brand	Solution, brand
	25	50	75	100	150
200	190	320	440
300	320	220	310	380	500
400	440	170	240	300	400

As a result, it turns out that the consumption of construction is equal to 9 bags of cement, that is, 450 kg, as well as 1300 kg of sand. You can give higher strength by adding a small amount of PVA glue - from 4 to 19 liters per 1 cubic meter. m. It will act as a plasticizer.

Nuances in the calculation

The screed on the floor surface is a special solution containing sand, water, and cement, all of which must be in strictly defined proportions. The amount and consumption of basic materials are directly proportional to the requirements that the final product must have. It is very important to calculate the consumption rates correctly, since the quality of the screed directly depends on this. The main calculation for the solution should be carried out only taking into account all parameters per 1 m2 or m3, and not the entire area of \u200b\u200bthe room.

During the work, cement solutions of various grades can be used, it all depends on the surrounding conditions. About 400 kg is spent on M100 grade mortar to create a base from M400 cement. If you recalculate per m2, you get about 45-50 kg - cement consumption - with a layer thickness of 10 mm. is considered the traditional brand most popular in screed construction. M200 grade - more reliable and durable - is used for leveling the subfloor in warehouses or garages.

When the screed hardens, as well as completely dry, the initial volume begins to decrease unevenly.

This can lead to severe delamination and significant cracking of the substrate. In order to avoid this during the work, it is required to periodically moisten the place of cracking with water at room temperature.

Separately, I would like to draw your attention to the choice of a supplier of building materials. We categorically do not recommend buying cement from a contractor, so you will not know in what conditions it was stored, how long it was in a warehouse or a car.

Due to long storage, due to the lack of storage conditions, cement can lose up to 15% of its activity per month. After all, its most dangerous enemies, moisture and carbon dioxide, are in the atmosphere. The decline in activity also inhibits the process of cement hydration.

Here it is worth paying attention to the fact that the higher the initial activity, the faster it is lost. Let's look at an example. You bought cement grade 500. Stored in the warehouse for two months. And he can already show the mark 400 ... Keep for another six months .... And you can just throw it away ...

Of course, a simple layman may object, but if the cement is stored in ideal conditions: in a moisture-resistant package and in a dry room. Alas, this process cannot be completely stopped, it can only be slowed down. This requires appropriate storage conditions for cement: type of storage, ambient humidity.

The ideal place to buy this is, since they take cement on orders, directly from the warehouse of the manufacturer's plant, and, accordingly, they do not have anything stale.

Retail chains have warehouses, and here the chain is already included, the manufacturer - the storage of the warehouse, - transportation to the warehouse of the retail network, again storage in the warehouse until the moment of sale, then again transportation, already to the seller.

The risks of getting a low-quality product increase, 2 points of storage, plus 2 transportation.

A purchase in an online store cuts off one link, cement is brought to you directly from the plant, unless of course the seller is a small intermediary, as a rule the role of the seller is performed by the contractor, offering turnkey work with his material.

Delivery is very well organized, and the cement is guaranteed to come fresh from the manufacturer to the customer

in Moscow, Yekaterinburg, Perm, Surgut, Nizhny Tagil and Chelyabinsk.

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Screed - a good foundation for any final flooring... It is convenient to hide any communication systems under it, equip ventilation and thermal gaps, as well as insulation and waterproofing. The consumption of floor screed per m² depends on its functions and the way of arrangement.

Types of floor screed

According to its purpose, it is customary to divide it into two types:

1. Final floor covering, for example, in warehouses and production areas.
2. Additional coating, before arrangement finishing floor.

Depending on the installation technique, you can name:

• connected - fits on the surface of the floor, does not separate from it, makes up a single whole;
• with partial separation - hydro and thermal insulation is carried out in the floor space under it, the connection remains only with the walls of the room;
• floating screed - given view used to provide good sound insulation. It lies on the waterproofing layers, not in contact with the walls or floor.

Depending on the method of arrangement, the screed can be:

• solid type - mounted by filling the entire space and further leveling;
• self-leveling self-leveling - does not require leveling, due to its high fluidity and weight, it levels itself;
• semi-dry option - involves two layers. One will be dry mix and the other will be mortar. This is done in order to reduce the amount of materials;
• prefabricated - fits from solid elements. Mainly used are large sheets of chipboard, plywood or gypsum board.

Sometimes used sand-cement screed with the addition of synthetic fiber to its composition. In terms of strength, it can be compared with a reinforced reinforced concrete base.

Calculation of the amount of the main components of the solution

If the area is 10 m², and the thickness is 1 cm, you will need - 10 m² x 0.01 m \u003d 0.1 m³. To fill a layer of 1 cm, one hundredth of a cubic meter of solution will be required per 1 m2 of area.

Using these calculations, you can calculate the flow rate of any screed solution. You just need to measure the area of \u200b\u200bthe room and know the required layer thickness. When calculating, it must be borne in mind that, in the process of preparing a solution, it thickens a little and loses in volume. For accuracy of calculations, an amendment of 10-12% is made up. The quantity of purchased materials must be calculated taking into account this amendment.

Cement brand	Solution grade	Mass of cement
400	200	490 kg
500	200	410 kg
400	150	400 Kg
500	150	330 kg

The ratio of sand and cement is 1 to 3

On video: criteria for choosing a cement for a screed.

Features of the use of various components for the screed

There are several different types screeds. They differ in the proportions of the components or the type of coating to which it is applied. There are ready-made mixtures, but usually their price is much higher.

When making a screed, the following components may be required:

1. Cement ... In construction, its highest grades are used for screed, and in the apartment there will be enough cement grade 400.
2. Sand ... Debris and stones are removed and sieved before mixing. It must be dry, moisture can reduce the quality of the future screed.
3. Plasticizers ... They may be needed to improve the quality of the solution.
4. Polymer and mineral additives ... Accelerate the screed hardening process.
5. Gypsum ... Used instead of cement, such a solution dries quickly, almost does not shrink, but is not used in rooms with high humidity.

When buying cement, be sure to look at the date of manufacture. The longer it is stored, the more moisture it absorbs and loses its brand and properties.

Simple technology for making a solution

To obtain a high-quality screed, the correct order and all technologies should be followed in the manufacture of the mortar. If errors are made in proportions or the mortar is heterogeneous, the resulting screed may crack or collapse.

You can mix and prepare the solution correctly by following simple guidelines:

• The dry bulk ingredients are mixed first. It is necessary to maintain the proportions accurate to the kilogram. If violated, the entire batch may turn out to be of poor quality;
• All liquid additives and plasticizers are first mixed with water. For a bag of cement weighing 50 kilograms, you will need about 200 ml of plasticizer. For exact dosages and proportions, see the package or the instructions for use;
• Mixing of dry components and water takes place by slowly pouring liquid into a container with a dry mixture, and not vice versa. It is necessary to control the homogeneity of the mass, and avoid the formation of lumps.

To facilitate the work and stir the solution evenly, you can use power tools: a special mixer or an ordinary drill with a nozzle will do. Such a solution will turn out to be homogeneous, and the preparation process will take less time.