How many cubes are in a kilogram of solution? Rules for the manufacture and application of cement-sand plaster Plaster mortar how many kg per m3

18.10.2019

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The table of cement consumption per 1 cubic meter of mortar shows the quantitative weight proportions of the composition of the mortar mixture for screed, masonry, and plaster.

In modern construction conditions, various types of cement-sand mixtures are used, the difference of which lies in the proportions of the components.

As a rule, a solution in proportions 1:3 (1 cement and 3 sand) plus plasticizer and fiber fiber.
Used for masonry maca mortar 150 1:4 (1 cement and 4 sand), there is no point in taking a higher brand because strength grade of red brick M150.
For plaster 1:1:5.5:0.3 (1-cement, 1-slaked lime, 5.5-sand, 0.3-clay)— brand of solution M50.

Typically, cement is used as a binding component in the preparation of mortar. It is absolutely clear that a cubic meter of mixture for laying a brick wall and a cubic meter of mixture for concrete have completely different ratios of components, since these two mortars are intended for different types of construction work.

Consumption of mortar for masonry

The ratio of cement to other components per cubic meter of mixture.
Beginning amateur builders often think that they can easily determine in what proportions to mix the components of the mixture “by eye.” And the price for these experiments are cracks in the foundation.
To correctly calculate the amount of cement in one cubic meter of mixture, expensive tools are not required. All you need to do is use:

table of concrete components - given at the beginning of the article.
concrete mixer;
scales (preferably electronic, although this is not a strict requirement);
a container in which you can measure the volume (most often, a bucket with a capacity of 10 liters is used for this);
calculator.

The proportion of ingredients for the construction mixture (cement, sand, water, aggregate, and, if required, special additives) is determined in accordance with the type of construction work.

During the interior decoration of a building, plaster based on a cement binder solution is often used. To get a high-quality solution, you need to know how much cement and sand is needed for plaster. It is best to purchase cement in bags to make it easier to make proportions. Depending on the need and service conditions, components are added to the cement mortar that will impart certain properties to the resulting mortar:

plastic;
frost resistance;
heat resistance;
resistance to aggressive environments;
slow or fast setting.

If the question is how much cement is needed to plaster walls, then it all depends on what kind of solution is needed. As a rule, from 1 to 6 parts of sand are taken for 1 part of cement. The solution is divided according to the amount of sand taken into the part of cement: fatty, thin and normal.

A greasy solution is obtained if the amount of cement is very large. This solution has strong shrinkage and cracks easily (1-3 parts of sand). Skinny ones, on the contrary, have an increased amount of sand per part of the concrete, they do not shrink and do not crack (6=< частей песка). Нормальные растворы имеют оптимальное соотношение заполнителя и вяжущего(4-5 части песка).

What proportions are they usually diluted in?

When using grade 400 cement, a solution is most often made with a ratio of 1 part cement to 4 parts sand. If you are interested in how much sand is needed in cement 500, then you need to add 5 parts of sand to 1 part of cement. It’s very easy to remember the values: for 400, 4 parts sand, for 500, 5 parts to 1 part concrete. At the same time, to obtain a high-quality solution, one must not forget to take into account that one year of storage: - 100 to the brand of cement. Many people forget about this property of cement.

Screed

If the question is asked - how much sand and cement is needed for a screed, then they mainly use grade 400 cement. The ratio of cement and sand is 1:4. The cement consumption for flooring is determined as follows: for a screed of 1 meter square and 10 cm high, one 50-kilogram M400 bag and 200 kilograms of sand are used. Calculation of the required amount of screed is done using the formula:

(Screed area, say 20 m2) * (screed height, and it is translated in meters, and 10 cm = 0.1 m) = volume of the required solution.

To calculate the required amount of sand and cement, it is necessary to divide the volume of the required solution by the number of parts (in this case there are 5) and multiply them by the average weight of a cube of material. For cement, this value is 1300 kg; if the exact weight of sand is not known, then the value is 1625 kg. Shrinkage also occurs in the amount of ¼ of the solution, and the resulting values will need to be multiplied by 1¼.

Due to the fact that plaster performs two functions - decorative and leveling, the calculation of the number of components, including cement, must be done separately in each specific case. Experts recommend a “wall-by-wall” calculation based on the so-called “average thickness of the plaster layer.”

Technology for determining the “average thickness of the plaster layer”

So-called “key points” or “beacons” are attached over the entire area of the wall to be plastered, which are set according to the level. These can be nails, self-tapping screws, screws or special strips. The rule here is “the more beacons, the more accurate the calculation.” In general, there should be at least three “key points” located over the entire wall area.

Linear measurements of the depths of the recesses are made, which in one place of the wall can be 5 cm, in another 2 cm, and in a third 6 cm. The measurements of irregularities are summed up, after which their average value is calculated.

An example of calculating the “average thickness of the plaster layer”

Let's say you mounted 15 beacons on the wall and set them level or plumb. Next, we measured and summed up the values of the unevenness - we got a figure of 67 cm. That’s it, we can determine the “average thickness of the plaster layer”: 67:15 = 4.46 cm or 0.0446 m.

Example calculation of plaster mortar consumption per 1 m2 of wall

In order to find out how much cement will be used for 1 m2 of plaster, you must first calculate the consumption of plaster mortar per 1 m2. We calculate the average thickness: 1mx1mx0.0446m=0.0446 m3 Thus, to plaster 1 m2 of wall, 0.0446 m3 of ready-made mortar will be required.

Example calculation of cement consumption per 1 m2 of plastered wall

As is known, the composition of a standard plaster mortar includes cement (M400 or M500), sand and water. At the same time, for M400 cement the proportions of binder and sand for mixing plaster mortar are 1:4, and for M500 cement – 1:5. Based on the given proportions and the average cement density of 1300 kg/m3, the amount of cement can be calculated.

For cement grade M400

0.0446:4=0.01115 m3 (volume of cement per 1 m2). For the convenience of further calculations, we will reduce m3 to kg;
1:1300=0.000769 m3 (volume occupied by 1 kilogram of cement);
0.01115:0.000769=14.5 kg (the number of kilograms of M400 cement required for plastering 1 m2 of wall).

For cement grade M500

0.0446:5=0.00892 m3;
0.00892:0.000769=11.6 kg (the number of kilograms of M500 cement required for plastering 1 m2 of wall).

When performing repair work yourself, you need to be able to correctly calculate the consumption of building materials. This will help you save money when purchasing them. Cement consumption per 1 m2 of plaster depends on the quality of the surface on which we will apply the solution, the technical characteristics of the mixture and the texture of the resulting coating.

Let's consider how to independently determine the mixture consumption depending on the thickness of the layer and the type of plaster used.

Types of cement mortars for plaster

Plaster mixtures used for wall finishing differ in the presence of certain components and their ratio. Divided into types:

Cement - sand	They are used for rough interior and exterior finishing, resulting in a durable, moisture-resistant coating. Suitable for finishing walls, ceilings in unheated, damp rooms and for cladding facades. The constituent components are cement and various fillers: sand, plasticizers, etc.	The standard solution is prepared in a ratio of sand and cement 1:3. Cement grade M 400 can be diluted 1 part to 8 parts sand. M 100 is mixed in a ratio of 1:2. The composition is selected depending on the type of surface, layer thickness, and operating conditions. To increase plasticity, add PVA glue to the finished mixture in a ratio of 50-100 ml per 10 liters of the finished solution.
Cement-lime	They have good adhesion to all types of surfaces. Used for finishing plinths, cornices made of stone and wood. Lime has bactericidal properties and protects the surface from mold and fungal infections.	1 part cement and lime to 5 parts sand. For a 25 kg bag of cement we take 21 kg of lime, 280 kg of sand, 50 liters of water.

The cement composition is most often used for rough finishing of walls. A thin layer cracks during operation, so it is recommended to apply cement-sand mortars with a thickness of 3 to 6 cm, depending on the material from which the walls are made and the plaster application technology used.

What affects material consumption

The amount of solution depends on the level of the walls. The more defects, the more mixture required

You can easily calculate the cement consumption for plastering walls yourself. Consumption is determined based on the following components:

type of solution and its components;
how smooth the walls are, and what material they are made of.

In multi-storey buildings, the level deviation of the plane is 2-2.5 cm. The greater the unevenness of the surface, the thicker the layer will have to be applied.

To reduce the consumption of the plaster mixture, the surface is treated with a primer in several layers. It helps remove dust from the surface, reduce absorbency and better adhesion of materials.

At the junction of two surfaces made of different materials, we install a construction mesh. Because of this, a thicker layer of plaster is required. The consumption of decorative plaster is calculated using a special method.

In old houses you can find perfectly straight walls, but more often they have crooked walls.

Calculate the layer thickness

We determine the difference in the surface relative to the vertical plane using a plumb line or installing beacons.

Methods for determining the curvature of walls:

We lower the plumb line from the ceiling, find the most protruding point of the wall, then measure the depth of the depressions.
We use long, even slats as beacons; we apply them to the wall and see how crooked it is; We measure the depressions on the wall.

For clarity, we give an example of calculating the thickness of a layer of cement plaster for a wall with an area of 12 square meters. m.

We add up the depths of the depressions on the walls and divide the resulting result by the number of beacons: (2+3+4+5): 4= 3.5 cm. The thickness of the plaster layer will be equal to 3.5 cm.

Standard consumption rates

One bag 25 kg

The average consumption of cement for plaster is indicated on the packaging, taking into account a layer of 10 mm, and is individual for each manufacturer. If we apply a solution with a thickness of 2 cm, then we multiply the quantity by 2, etc. For plaster, the average consumption is 8.5 kg per sq.m.

If we take a 25 kg bag, then 8.5:25 = 0.34% of the amount of the bag will spread the plaster per 1 m2.

Let us consider in the table the calculation of cement consumption for plastering walls depending on the thickness of the applied layer at a standard consumption rate of 8.5 kg per square meter. m:

Marble chips give the “Bark Beetle” mixture a relief

The composition for finishing bark beetle plaster contains marble chips, which results in a relief surface with an interesting structure. Standard consumption ranges from 2.5 to 4 kg. Each manufacturer indicates these indicators on the label.

Venetian plaster is applied in a layer of several millimeters, resulting in a small mixture consumption of 70 to 200 grams per square meter. m. Working with such material requires experience; in order to apply it to the surface efficiently, it is better to invite a professional.

Gypsum compositions are consumed in a ratio of 9 kg per square meter. m. The plaster quantity calculator on our website will help you quickly calculate how much of this material will be needed for finishing work.

When purchasing a plaster mixture, you need to add 10% to the calculated amount of material so that you don’t have to run to the store during the work.

We plaster with our own hands

Apply three layers of plaster

After we have calculated the required amount of material and purchased dry components, we begin to carry out the work.

Step-by-step instruction:

We prepare the surface. We clean the wall from dust and flaking building materials. We remove rust and oil stains.
We prime the surface in 2-3 layers, applying each subsequent layer after the previous one has dried.
Apply the plaster in three layers. First of all, spray a solution of medium consistency onto the wall; this can be done with your hands, a spatula, or poured from a ladle. Then we rub the composition over the surface with a rule or a grater: apply 4-5 mm thick to a concrete surface, up to 7 mm to a brick surface, and up to 10 mm to wood.
The second layer is the main one. Mix the solution a little thicker than for spraying. Using a spatula or trowel, apply the composition to the wall and rub it over the surface, leveling it.
Apply the last layer with a thickness of no more than 4 mm, and prepare a more liquid solution for it. Apply the coating to the moistened base layer. After setting, but before the surface dries, we grout. For more information about plastering work without beacons, watch this video:

A type of wall plaster is beacon finishing, which allows you to create a perfectly flat surface.

The guides are installed strictly according to the level at a distance slightly less from each other than the width of the rule. Beacons can remain in the wall or be removable.

Rule from the bottom up

Stages of applying plaster to lighthouses:

We fill the area between the beacons with a solution and level it using the rule. We fill all the voids and carefully level them.
We cover and rub the surface well.

We need to prepare such a volume of solution that we can apply it before it hardens.

Be sure to study the calculations of plaster consumption before starting work.

Repair is not complete without leveling the walls and performing plastering work. The surface treated with a cement composition serves as a reliable basis for finishing.

In order not to make mistakes when purchasing materials for independent repairs or to control the builders, you need to know how much material is consumed. After studying this article, you can easily calculate these indicators.

Finishing work always begins with correcting problems with the walls using plaster “add-ons”. In each specific case, to effectively use the capabilities of plaster, it is important to maintain the correct proportions of cement and sand mortar. You can save money and try to prepare a mortar for plaster from the remains of the masonry composition, or you can make a mixture according to science, maintain the required proportions of cement and sand, then the mortar will last a long time and be strong.

Sand-cement mixture from the remains of masonry mortar

For masonry, a mixture of sand and binder cement is used in standard proportions with the addition of a small proportion of lime or clay. Bricks in masonry are knitted using a standard proportion: 400 grade cement take a bucket with 4 buckets of sand, for 500 grade sand put more in a bucket. Depending on the proportion of lime or clay, the composition becomes rigid and more plastic. This is extremely important for keeping the brickwork upright.

Let’s make a reservation right away: the remains of the masonry mixture in its original form are not very suitable for plastering walls for a number of reasons:

The proportions of the plaster mortar have a higher cement content, with a minimized amount of lime or clay;
By the time plastering work begins, the remaining masonry mortar will have partially lost its plasticity and will give poor adhesion to the surface of the brickwork, and such a mixture will not stick to the concrete surface at all without special adhesive additives.

Advice! Use the remains of the masonry mortar to adjust the filling of the joints and do not try to adjust its proportions to the values of the plaster mortar by adding cement or sand.

Basics and proportions for preparing solutions

A plaster composition based on a mixture of sand and cement must be prepared and used as quickly as possible, before the process of partial binding of free water with cement grain begins. On sale you can purchase a ready-made plaster mixture for a wide variety of plaster options, in which the optimal proportions of sand and cement have already been selected.

The most successful option is considered to be the situation if you manage to buy several bags from a large proven batch of mixtures at a serious construction site, not very old and proven in practice. The same goes for buying cement. The most problematic from a quality point of view is considered to be the use of old packaged or hung building materials. In this case, the recommended proportions of cement-sand 1:3 need to be adjusted and a couple of practical test batches done. Most often, grade 400 ShPTs or PTs is used in plaster.

To carry out work to correct defects in the geometry and curvature of walls, use PC I cement mortar with a sand/cement ratio of 3:1 as a masonry primer. For mortar for the main leveling mass of plaster, grade 400 - PC II with a proportion increased to a ratio of 5:1.

Choosing sand for the solution

The requirements for sand for the plaster composition are higher than for the masonry option:

The sand must be sifted and washed; it is extremely important to obtain large and medium sand fractions and eliminate dust and clay inclusions.
The larger the sand fraction, the better the adhesion to the wall, and the harder the plaster becomes. If there is nothing but coarse sand, you can add a small amount (up to 5%) of fatty clay, ground to a fine powder. With a higher clay content or the presence of clay lumps in the mixture, a network of small cracks may form on the surface of the plaster.
An excessively fine sand fraction can make the plaster solution too plastic and slippery, does not hold the applied layer well, and floats. The recommended maximum layer on such sand is, as a rule, no more than 3 mm; it is excellent for finishing surface finishing work.

Important! In the preparation of plaster, only dry sand is used; even a slightly moistened mixture with cement mixes very poorly with dry cement, the material will be heterogeneous, and, as a result, the surface of the plaster will crumble and crumble in places.

The most used cement grades in plastering

Depending on the goals and objectives, Portland cements or Portland slag cements of a grade not lower than 400 are used for plaster mortar, and less often, in special cases, grade 500. Most craftsmen are well aware of the preparation technique and the required proportions of the solution, the requirements for sand and cement, but they cannot always successfully select the required brand for specific types of plaster or working conditions.

For large areas of plastering work, with a small amount of corrections or leveling of walls, Portland M400 type 1 is used; on the packaging marking after the letters PTs you can see the designation I or II. The first is the cement with the maximum rate of increase in hardness and rigidity. The listed cements have proven themselves well for plastering external walls in conditions of high humidity and low temperature.

The second type of cement corresponds to Portland with special additives that reduce the internal stresses of concrete and cement castings, improve the ductility and frost resistance of the plaster composition. This cement is well suited for leveling walls.

In addition, there are many specialized grades of cement with improved characteristics, but they are used in industrial structures and are most often not used for ordinary plastering work.

Use of special modifying additives

It is not always possible to achieve high-quality “adhesion” of the plaster mixture to the brick or, especially, concrete base of the walls. Often the cause of abnormal adhesion is the incorrect consistency of the prepared plaster mass or poor preparation of the wall surface itself. It is quite easy to check the consistency of the plaster composition - from the smooth metal surface of a trowel or rule, the solution slides off in about 7-8 seconds in one compact piece, and does not flow down or stick tightly to the tool.

In the finished plaster mixture, the “stickiness” of the plaster solution is artificially increased by adding small proportions of powdered water-soluble carbocellulose or polyacetate adhesive compositions. They displace air from the surface of the plaster mass and reduce the surface tension coefficient of bound water.

Thanks to this, the frozen layer acquires a very even and smooth surface. As an alternative to preparing walls and plaster mixtures, you can use ready-made liquid KMS compositions intended for priming walls and preparing plaster solutions.

But most often, to improve the plasticity of plaster cement-sand mortars based on M400 I, craftsmen and amateurs use cheap washing powder or liquid synthetic detergent, in a proportion of 50-70 g per 50 liter tank of the mixture. The effectiveness of this method is difficult to assess due to conflicting reviews, but to be sure, it is better to test the recipe with a surfactant using small portions of the plaster composition.

A small amount of fatty clay, 50-100 grams per 15 liters of water, has a roughly similar, but less expressive effect. The clay mass is rubbed by hand in water until a homogeneous cloudy suspension is obtained, which is filled with a dry mixture of cement and sand. The plaster mass becomes more plastic and less susceptible to high air temperatures, and takes longer to dry than usual. If you overdose the required proportion of clay or dry it in a strong draft, a network of microcracks may form on the plastered surface.

In the previous recipe, clay can be replaced with lime paste or a liquid lime substitute in the proportion of 150 grams of additive per 50 kg of plaster mixture. This version of plaster can be prepared for external walls and even semi-basements.

For walls whose surface is exposed to regular and fairly strong temperature changes, it is better to use the addition of a small proportion of chopped fiber material based on polymers, fiberglass or fiber structures to the mixture.

Conclusion, special components for plaster

To reduce the density of the plaster and increase thermal insulation, special types of sand and ground natural raw materials can be added to the plaster composition in the required proportions. Flour and grains from crushed dolomite and calcined vermiculite increase the number of pores and microcavities in the volume of the cement mortar of the plaster up to 30-33%, and in special proportions, air entrainment in the plaster mass can reach 47-50%.

The number of pores can also be increased by using special reagents such as Ceresit CR166, specially designed to reduce the amount of water vapor in the atmosphere of enclosed spaces.

Making your own plaster mortar does not require extraordinary knowledge; it is enough to accurately maintain the proportions of cement and sand and use special additives in the mortar. Buying a ready-made plaster mixture will cost 2-2.5 times more expensive at an average level of plaster quality.

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Correct calculation of components for preparing a mortar mixture affects the basic qualities of brickwork (strength, durability), cement-sand screed for leveling the floor and other works in which the mortar is used.

When calculating the selection of proportions of cement and sand, it is necessary to take into account that when the grade of cement increases, the amount of this material must be reduced to obtain a solution of the same grade. Sometimes, when installing screeds, the uncured surface is sprinkled with cement - this increases the strength of the coating, but more cement is used. We will describe how to calculate how much cement is needed per cubic meter (1m3) of solution, depending on its brand.

The need for cement per cubic meter of solution may depend on:

purpose of the mortar mixture (for masonry, for plaster, for flooring). In construction, cement-sand mortars (masonry mortar or screed mortar), clay and lime mortars (for plastering surfaces) can be used. So in the first solution, cement and sand are taken in a ratio of 1 to 3 or 1 to 4. The latter option is used for laying partitions, and for load-bearing walls it is better to use a high-strength solution of 1 to 3 or higher. In lime mortar, the main binder is lime; the volume fraction of cement is one third of the finished mortar. If a clay mixture is used, then the amount of cement in it is 1 to 9;
brand of mortar, which characterizes its compressive strength after complete hardening (27 days);

The composition of the solution characterizes the ratio between the binder and fine aggregate.

Let's consider what amount of M400 cement is needed to obtain different grades of mortar; the weight of cement corresponds to its amount per 1 m3 of mortar;

to prepare the M10 grade of mortar you need 81 kg of cement;
for grade M25 you need 133 kg of cement;
for grade M50 you need 178 kg of cement;
for grade M75 you need 245 kg of cement;
for grade M100 you need 304 kg of cement;
for grade M150 you need 414 kg of cement;
for grade M200 you need 510 kg of cement.

You can calculate how much cement is needed per cubic meter (1 m3) of solution based on the proportion of 1 to 3 or 1 to 4, knowing that a 10 liter bucket of cement weighs 14 kilograms. You also need to know that the same amount of water used to prepare the solution is the same as cement.

Consider the ratio of 1 to 3. With this ratio we have 5 parts (1 part cement, 3 parts sand and 1 part water).

Therefore, the cube will contain 200 liters of cement, 600 liters of sand and 200 liters of water. In terms of weight, a cube of such a solution requires 20×14 = 280 kg.

Now let's calculate the ratio 1 to 4 (1 part cement, 4 parts sand and 1 part water). Here you need a little more water, so one part will correspond to 1000/6=150l. We calculate the amount of cement per cube of such a solution: 15×14 = 210 kg.

Let's consider how to independently determine the mixture consumption depending on the thickness of the layer and the type of plaster used.

Types of cement mortars for plaster

Plaster mixtures used for wall finishing differ in the presence of certain components and their ratio. Divided into types:

Type of mixture	Characteristics	Proportions
Cement-sand	They are used for rough interior and exterior finishing, resulting in a durable, moisture-resistant coating. Suitable for finishing walls, ceilings in unheated, damp rooms and for cladding facades. The constituent components are cement and various fillers: sand, plasticizers, etc.	The standard solution is prepared in a ratio of sand and cement 1:3. Cement grade M 400 can be diluted 1 part to 8 parts sand. M 100 is mixed in a ratio of 1:2. The composition is selected depending on the type of surface, layer thickness, and operating conditions. To increase plasticity, add PVA glue to the finished mixture in a ratio of 50-100 ml per 10 liters of the finished solution.
Cement-lime	They have good adhesion to all types of surfaces. Used for finishing plinths, cornices made of stone and wood. Lime has bactericidal properties and protects the surface from mold and fungal infections.	1 part cement and lime to 5 parts sand. For a 25 kg bag of cement we take 21 kg of lime, 280 kg of sand, 50 liters of water.

The cement composition is most often used for rough finishing of walls. A thin layer cracks during operation, so it is recommended to apply cement-sand mortars with a thickness of 3 to 6 cm, depending on the material from which the walls are made and the plaster application technology used.

What affects material consumption

The amount of solution depends on the level of the walls. The more defects, the more mixture required

You can easily calculate the cement consumption for plastering walls yourself. Consumption is determined based on the following components:

type of solution and its components;
how smooth the walls are, and what material they are made of.

In multi-storey buildings, the level deviation of the plane is 2-2.5 cm. The greater the unevenness of the surface, the thicker the layer will have to be applied.

To reduce, the surface is treated with a primer in several layers. It helps remove dust from the surface, reduce absorbency and better adhesion of materials.

At the junction of two surfaces made of different materials, we install a construction mesh. Because of this, a thicker layer of plaster is required. produced using a special technique.

In old houses you can find perfectly straight walls, but more often they have crooked walls.

Calculate the layer thickness

We determine the difference in the surface relative to the vertical plane using a plumb line or installing beacons.

Methods for determining the curvature of walls:

We lower the plumb line from the ceiling, find the most protruding point of the wall, then measure the depth of the depressions.
We use long, even slats as beacons; we apply them to the wall and see how crooked it is; We measure the depressions on the wall.

For clarity, we give an example of calculating the thickness of a layer of cement plaster for a wall with an area of 12 square meters. m.

We add up the depths of the depressions on the walls and divide the resulting result by the number of beacons: (2+3+4+5): 4= 3.5 cm. The thickness of the plaster layer will be equal to 3.5 cm.

Standard consumption rates

One bag 25 kg

The average is indicated on the packaging, taking into account a layer of 10 mm, and is individual for each manufacturer. If we apply a solution with a thickness of 2 cm, then we multiply the quantity by 2, etc. For plaster, the average consumption is 8.5 kg per sq.m.

If we take a 25 kg bag, then 8.5:25 = 0.34% of the amount of the bag will spread the plaster per 1 m2.

Let us consider in the table the calculation of cement consumption for plastering walls depending on the thickness of the applied layer at a standard consumption rate of 8.5 kg per square meter. m:

Marble chips give the “Bark Beetle” mixture a relief

Gypsum compositions are consumed in a ratio of 9 kg per square meter. m. on our website will help you quickly calculate how much of this material will be needed for finishing work.

When purchasing a plaster mixture, you need to add 10% to the calculated amount of material so that you don’t have to run to the store during the work.

We plaster with our own hands

Apply three layers of plaster

After we have calculated the required amount of material and purchased dry components, we begin to carry out the work.

Step-by-step instruction:

We prepare the surface. We clean the wall from dust and flaking building materials. We remove rust and oil stains.
We prime the surface in 2-3 layers, applying each subsequent layer after the previous one has dried.
Apply the plaster in three layers. First of all, spray a solution of medium consistency onto the wall; this can be done with your hands, a spatula, or poured from a ladle. Then we rub the composition over the surface with a rule or a grater: apply 4-5 mm thick to a concrete surface, up to 7 mm to a brick surface, and up to 10 mm to wood.
The second layer is the main one. Mix the solution a little thicker than for spraying. Using a spatula or trowel, apply the composition to the wall and rub it over the surface, leveling it.
Apply the last layer with a thickness of no more than 4 mm, and prepare a more liquid solution for it. Apply the coating to the moistened base layer. After setting, but before the surface dries, we grout. For more details, watch this video:

A type of wall plaster is beacon finishing, which allows you to create a perfectly flat surface.

The guides are installed strictly according to the level at a distance slightly less from each other than the width of the rule. Beacons can remain in the wall or be removable.

Rule from the bottom up

Stages of applying plaster to lighthouses:

We fill the area between the beacons with a solution and level it using the rule. We fill all the voids and carefully level them.
We cover and rub the surface well.

We need to prepare such a volume of solution that we can apply it before it hardens.

Be sure to study the calculations of plaster consumption before starting work.

Repair is not complete without leveling the walls and performing plastering work. The surface treated with a cement composition serves as a reliable basis for finishing.

Technology for determining the “average thickness of the plaster layer”

An example of calculating the “average thickness of the plaster layer”

Example calculation of plaster mortar consumption per 1 m2 of wall

Example calculation of cement consumption per 1 m2 of plastered wall

For cement grade M400

0.0446:4=0.01115 m3 (volume of cement per 1 m2). For the convenience of further calculations, we will reduce m3 to kg;
1:1300=0.000769 m3 (volume occupied by 1 kilogram of cement);
0.01115:0.000769=14.5 kg (the number of kilograms of M400 cement required for plastering 1 m2 of wall).

For cement grade M500

0.0446:5=0.00892 m3;
0.00892:0.000769=11.6 kg (the number of kilograms of M500 cement required for plastering 1 m2 of wall).

How many cubes are in a kilogram of solution? Rules for the manufacture and application of cement-sand plaster Plaster mortar how many kg per m3

Read also

Consumption of mortar for masonry

What proportions are they usually diluted in?

Screed

Technology for determining the “average thickness of the plaster layer”

An example of calculating the “average thickness of the plaster layer”

Example calculation of plaster mortar consumption per 1 m2 of wall

Example calculation of cement consumption per 1 m2 of plastered wall

For cement grade M400

For cement grade M500

Types of cement mortars for plaster

What affects material consumption

Calculate the layer thickness

Standard consumption rates

We plaster with our own hands

Types of cement mortars for plaster

What affects material consumption

Calculate the layer thickness

Standard consumption rates

We plaster with our own hands

Technology for determining the “average thickness of the plaster layer”

An example of calculating the “average thickness of the plaster layer”

Example calculation of plaster mortar consumption per 1 m2 of wall

Example calculation of cement consumption per 1 m2 of plastered wall

For cement grade M400

For cement grade M500