The floor screed is an integral part of the floor of a residential, technical or industrial room. At the same time, the floor screed can serve as a basis for flooring a finishing coating and as a "finishing" coating for utility and industrial premises.
calculation of material per square meter of floor depends on many factors
An example of calculation for a classic floor screed
Earlier, we have already considered in detail. Before proceeding, for example, calculating the amount of cement and sand for a floor screed for a particular room, a number of assumptions should be made:
- Screed thickness. According to building codes, the minimum thickness of a reinforced floor screed is 2 cm, the maximum thickness of a non-reinforced general-purpose screed is 4 cm. We take into account the layer thickness of 4 centimeters, as the most optimal and widespread option;
- Solution grade. Recommended brands of mortar: M150 or M200;
- Recommended cement grades - Portland cement M300, M400 or M500;
- The calculation of cement and sand is carried out in kilograms per 1 cubic meter of mortar for pouring the screed;
- The fill volume is calculated in cubic meters. In other words, the length and width of the room, as well as the thickness of the screed layer, are measured in running meters.
So. How much cement is needed for floor screed, poured with cement-sand mortar of the M200 brand (proportions of cement and sand 1: 3), based on M400 cement, single-layer, 0.04 m thick for a room of 4x3.5 meters?
We calculate the volume to be filled: 4x3.5x0.04 \u003d 0.56 m3. To calculate the cement, we use the table of the amount of binder per 1 m3 for mortar grades M150 and M200, based on cement: M300, M400 and M500:
| Cement grade | Solution grade | |
| M150 | M200 | |
| Cement | Cement consumption per 1 cu. m solution | |
| M500 | 330 kg | 410 kg |
| M400 | 400 Kg | 490 kg |
| M300 | 510 kg | — |
As follows from the table, for the preparation of 1m3 of M200 grade solution based on M400 cement, 490 kg of binder (cement) is required. Since we need to prepare not 1 m3 but less - 0.56 m3, the following arithmetic operation should be performed: 490x0.56 \u003d 274.4 kg of M400 grade cement is required to prepare the M200 solution, to fill the floor screed with a thickness of 4 cm in a 4x3 room, 5 m.
Calculation of the amount of sand based on the above proportion 1 part of cement to 3 parts of sand (moisture content no more than 7%): 274.4x3 \u003d 823.2 kg of sand, required to prepare a cement-sand mortar for pouring a floor screed with a thickness of 4 cm in a 4x3 room, 5 m.
Similarly, you can calculate the number of components for any thickness of the screed, for rooms of any size - multiply "your" length and width of the room and "your" thickness of the screed layer in meters. Using tabular data, determine the amount of cement, and then determine the amount of sand based on the proportions.
Helpful advice! To increase the durability of the screed, especially important for "finishing" floor screed, be sure to iron its top layer.
The "iron" technology is as follows:
- Immediately after pouring IMPORTANT! and leveling the layer, sprinkle the surface of the screed with clean dry cement with a layer of 3 mm;
- Spray the surface with water until the cement is completely wetted;
- Using light circular motions with a flat grout or trowel, rub the cement into the surface, which should take on a uniform dark green tint with "blue".
Thus, a hard, wear-resistant and very strong crust is formed on the surface of the screed, reliably protecting the screed from abrasion and other mechanical influences.
Before pouring the floors, you must first choose a good solution, the quality of the future coating will depend on this. Next, you should calculate the consumption of dry mix per 1 m2 of screed.
What is better to use
The classic option for flooring is a cement-sand mixture. It is made in a ratio of 3 parts of cement to 1 part of sand, and various plasticizers can also be added here. DSPs are sold in pre-packaged bags. All proportions of the components are observed in them, it remains only to add the correct amount of water. Packaged sand concrete consists of sand of various fractions, chemical additives and, as a rule, Portland cement. Often use reinforcement meshwhich helps to evenly distribute the load. Consumption of a cement-sand mixture for 1m 2 of a screed is calculated based on the layer thickness and grade. It dries long enough - up to 28 days. Benefits:
- durability;
- strength;
- excellent absorbency;
- vapor permeability.
The second option for flooring is the use of concrete. The following classes are usually used: B20, B10, B15. Gravel, sand or crushed stone is added to the solution. Concrete base can be of different consistency: semi-dry or densely plastic, the size of the filler should be less than 1/3 of its thickness. This solution can be supplied using a pneumatic pump. Concrete is not afraid of moisture, heavy loads, very strong and durable.
The use of plaster will allow you to complete the work in a short time. The solution is made from anhydrous calcined gypsum (anhydride), water and lime. Such a base is easy to arrange, it dries in about 24-29 hours. The material is very flexible and practically does not shrink, it is suitable for a thin layer, the surface is even and smooth.
It is undesirable to make a plaster floor in a damp room, as it absorbs water well.
Anhydrite screed does not crumble, tolerates temperature changes and does not crack.
The installation of a floor with synthetic resins allows you to make the surface perfectly flat. Self-leveling material is laid in one or more layers. The basis for self-leveling floors are synthetic resins, they are smooth, they can be of different colors.
Calculation of the required quantity
Before calculating the consumption of dry mix for floor screed per 1 square meter of area, you should measure the length and width of the room, as well as the height of the future coating. To make the floor even, beacons must be placed around the perimeter of the room. You can calculate the required volume by multiplying the length by the height and width. When setting up a cement-sand base, add 20% to this number - this takes into account the shrinkage when the solution hardens.
Before starting the floor screed, it is necessary to calculate the consumption of the mixture that will be required for the screed. To do this, it is necessary to calculate the zero level, which is determined using a laser device. If you do not have the opportunity to purchase such a device, then it is quite possible to get by with a spirit level, or a water level.
Buying an excessive amount of material is not economically rational, and a shortage leads to a violation of technology.
Calculation of the mixture for work
It should be noted the zero level of the floor in all rooms, it can be either arbitrary or specific. The most optimal value is 1.2-1.5 m from the floor. The first mark can be placed anywhere, and then, using a level or a laser device, it is transferred to the walls. The marks should be on the same line. The resulting marks must be connected with a line, due to which they get a zero level.
To calculate the consumption of material, a preliminary marking of the walls is necessary to determine the thickness of the layer.
So, the zero level is set, now you should find out the maximum floor heights and the level difference in height. After calculating the average floor thickness, it will be easier to calculate the consumption of dry mix for the screed. To do this, you need to measure the distance between the floor and the zero level at different points in the building, the values \u200b\u200bobtained are written on the wall. Then, in order to calculate the consumption of the mixture, you need to do a little mathematical calculations.
Example. The maximum value is 1.29 m, the minimum is 1.23 m. Accordingly, the height difference is 0.06 m or 60 mm. Consumption with a layer thickness of 1 mm is 2.2 kg per 1 m 2. It is necessary to multiply the level of the height difference by the solution flow rate. In other words, it turns out 60 mm x 2.2 kg \u003d 132 kg per 1 m 2. Then you need to multiply the flow rate for 1 m 2 by the square of the room. For example, the room has a square of 20 m 2, so 132 x 20 \u003d 2560 kg of composition will be required. In order to determine the volume of the required mixture in bags, the volume obtained in kilograms must be divided by the weight of one bag of solution.
These calculations allow you to find out the required volume of the mixture only approximately, since the amount of materials for the floor screed depends directly on the material itself that you choose for work.
In order for the floor to be reliable and durable, it is necessary to ensure proper care, that is, it is necessary to monitor the humidity, since the further strength of the solution depends on it.
As for the amount of solution, its amount can be reduced. For this, it is first necessary to level the floors, this is done with the help of earth, which the future floors are filled with. After backfilling, the earth must be carefully tamped, also with the help of an optical device or a spirit level, the horizontal position should be checked in those places where it is not observed, the earth must be poured and tamped again. By the way, you can make an even base from the ground using a long beam, with which the base is leveled. In this case, it will be much easier to make the calculations: you need to multiply the square of the room and the height of the screed. For example, the height is 5 cm, and the square is 20 m 2, respectively, 100 kg of cement mass will be required.
As for the mass for the screed, you can do it yourself, you just need to correctly form the cement mass. For a screed, a mixture is needed in the following proportions: 1 part of cement, 2 parts of sand and 3 parts of crushed stone (fine-grained), instead of crushed stone, screening can be used. Although the cement mass can only be made with sand and cement.
Self-leveling screeds
If you need a perfect surface, then it is advisable to use self-leveling mixtures. Such a surface is needed for laying tiles, laminate, linoleum and other types floor coverings... The mortar is made on the basis of cement, gypsum and anhydrite. Self-leveling mixes are ideal for subsequent styling ceramic tiles... When correct selection dry mix, this type of screed will be inexpensive. Moreover, the advantage of self-leveling solutions is the presence of reinforcing microfibers in their composition, that is, there is no need for reinforcement. you save on fittings.
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.
Screed thickness (mm):
Amount of sand concrete (kg):
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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 renovation 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 apply 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 will be needed to cover your floor. And then you should divide the resulting result either by forty or fifty kilograms, depending on which 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.
