How to calculate the consumption of plaster on 1 m2 walls?

The quality of the wall surfaces is one of the most important factors affecting their decorative properties. Therefore, plastering is carried out almost always before all finishing works. Today, the market of building materials is saturated with many mixtures. Some of them are used to align, while others are used to create decorative grounds.


Plaster is a special composition that, after frozen, form a durable layer. The feature of the materials is the possibility of its uniform distribution over the surface to create a flat plane. One of the criteria to pay attention to when choosing plasters for walls is their expense.

The volume of products per 1 m2 depends on several factors:

  • Type of plaster. Today, cement, gypsum or special polymers are used to produce such compositions. All these products are distinguished by density and coveredness. Therefore, the consumption of room plaster may vary in a wide range.

  • Surface structure. Walls of any apartment are not initially perfectly smooth. The base may have many curvatures that do not allow evenly to calculate the consumption of the material for its coverage.

Many plaster are applied if the curvature of the walls does not exceed 2.5 cm. When this figure is much more, the specialists are plastering in several layers using special leveling lighthouses. But it should be understood that the thickness of the plaster, the higher the risk of its cracking and foaming over time. To eliminate such consequences, use various reinforcing meshes to strengthen frames.

How to calculate?

The calculation of the plaster mix is ​​an important step, which is desirable to conduct before all the work. It will afford how many bags will need to be purchased to cover one square meter wall.

Before starting to calculate, the basis should be carefully prepared. An old coating is removed from the walls, which is permanently held on them. It is also important to align all the great protrusions, as they will affect the amount of solution for plastering.

The calculation technology involves several consecutive actions:

  • In the first step, determine the degree of curvature. This indicator indicates how much some areas have surface drops. For this, lighthouses are exhibited on the walls that are aligned with a laser level. It should be attached to the same solution that will be applied to plastering (lime, cement).

To better navigate and measure curvature, you can attach thin threads to them. Lighthouses are preferably located all over the walls of the wall.

  • After that, the deviation thickness is measured between the plane, the lighthouse and the base itself. The number of measurements should be more than 3 pcs. The more such checkpoints, the more accurately it will be possible to determine the desired characteristic.

Calculate the optimal thickness of the layer is quite simple. For this, all obtained values ​​are plusing, and then divided by the number of measurements. It turns out arithmetic average.

  • Learning the average thickness of the future layer, you can proceed to calculating the number of plaster compositions. This process is relatively simple. Each plaster manufacturer indicates the packaging the optimal consumption of the mixture to 1m 2 with a layer thickness of 1 cm. Often the norm is considered to be 8.5 kg for the previously specified volume.
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Please note that manufacturers indicate the amount of dry mixture, and not a cooked solution where you can add more water.

To find out the consumption for your specific case per unit area, you need to simply proportionally increase the value depending on how much the layer is thick than 1 cm. For example, if you need to put 2 cm plaster, then at the expense of 8.5 kg you need 17 kg.

On this technology calculation ends. All other operations are carried out proportionally depending on the initial characteristics. For example, for calculating 40 kV. m need to just multiply the number previously obtained by 40. Thus, it is possible to calculate the volume of the material regardless of the number of squares of the wall.

Having learned the full number of plaster, it is easy to calculate the number of CPS bags that are needed to cover a certain area. For this, the whole weight of the mixture is simply separated by a mass of one bag (in most cases it is 25 kg).

Note that when calculating the bags should be rounded the resulting digit up, if it is not a whole. Theoretically, this will allow you to purchase a small stock of a mixture, which is almost always no excess.

About important details in the process of calculating plaster you will learn by looking at the following video.


It should be understood that the consumption of plaster depends primarily on its composition.

You should select several indicators for popular plasters:

  • Gypsum. It takes such a mixture for plastering the smallest number. Average consumption reaches 9 kg / m2.
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  • Cement. Mixtures of this kind are the most dense, because consist of sand. Consumption of such products already reaches 17 kg. Therefore, the walls should be durable to withstand such an additional weight.

  • Textured and decorative Plasters spend economically. Depending on the composition and purpose, they will need 1.5 to 3 kg / m2.

These values ​​are not universal, as it all depends on the composition of the product. Therefore, many well-known manufacturers have their own expenses for which it is important to pay attention to the selection of compounds.


The popularity of plasters led to the emergence of various types of such products on the market. Among all this diversity, such popular brands of plaster mixtures can be noted:

  • Knauf – Products from the German manufacturer. Mixes are distinguished by high quality and plasticity. The company produces several species of plaster compositions that can be used both in and outside buildings.

Here you can find frost-resistant species.

  • Kraisel – another German manufacturer of plasters. The product range is represented by both classic mixtures and compositions for automatic application. Produce products with the addition of acrylic, cement or special silicates.

  • Bolls – Russian plaster, which is represented by several types of mixtures. To improve characteristics, developers add special polymers. The company produces both ordinary gypsum solutions and frost-resistant facades.

  • WEBER STUK and VETONIT. Products are available one manufacturer. The first type of plaster refers to moisture-resistant, as it is based on a special cement mixture. The second representative is a universal plaster plaster, which can be used only in dry rooms.
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  • “Students”. Under this brand, classic gypsum plaster. They differ in economy, high elastic properties and ability to skip air. You can apply them only in dry rooms. The material is easily applied, which allows to obtain a rather thin layer of the finish coating.

  • Ceresit. The company specializes in various building mixtures. It produces many different plaster compositions. A special popularity acquired cement and gypsum mixtures of universal purpose. Products are distinguished by high quality and unique specifications. Also in the assortment you can find decorative plaster type “Coroed” and T. D.

Tips and recommendations

The purpose of plastering is to obtain a flat surface, which will then be easy to use for decorative trim.

When calculating the number of similar mixtures, several simple tips should be taken into account:

  • The minimum thickness of the applied layer must be a few millimeters more than the height of the highest point. Therefore, it is so important to use beacons to see this indicator visually.
  • If you do not have experience in finishing the premises, do not try for one approach to get a perfectly smooth layer without the use of beacons. Many specialists need a certain time and experience with such surfaces.

      • Simplify the technology of calculating structural or repair plasters can be using special calculators that are quite a lot on the Internet.
      • Exhibit lighthouses preferably throughout the surface of one of the walls. If you start only on one of the plots, then there is no guarantee that the rest of the area you can align perfectly exactly.
      • Purchase the number of plaster slightly more than you got after such operations. It is necessary, since the mixture consumption increases due to non-accurate use and other factors.

      The technology of calculating the plastering mixture is a fairly simple operation that requires only attentiveness and correct measurement of height drops.

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