Carrying out finishing work in an apartment often includes leveling the walls. plastering method. In order to determine in advance the amount of purchased material, you need to know the consumption of plaster required for this operation. This awareness will not only help you avoid downtime caused by lack of dry mix, but also avoid unnecessary costs. Hired workers, wanting to earn extra money, often overestimate the amount of dry mix used, and such a calculation will bring them to clean water.
Important! To calculate the consumption of plaster, which will be required to obtain a smooth surface, it is not enough just to multiply the consumption of the dry mixture by 1m2 indicated on the bag with the plaster mixture by the area of the treated wall. The calculation should take into account such parameters as the curvature of the walls and the type of material used for plastering.
Determining the layer thickness
To make a preliminary calculation and find out how much material is required per square meter of coating, you need to determine the thickness of the applied plaster. To do this, the first step is to clean the surface of the wall as thoroughly as possible.
Smooth walls in apartments, especially those built during the Soviet period, are quite rare. To find out the deviation of the wall, follow on it set up several beacons. The layer thickness is calculated as follows:
- The deviation from the plane is measured for each beacon.
- All results are summed and divided by the number of measurements. The resulting value will be the average layer thickness, on which the consumption of plaster necessary to level the existing number of square meters of the wall will depend.
For example, you need to plaster a wall with an area of 12 m2 with a maximum deviation of 6 cm. Four beacons were installed that showed deviations of 1.2, 4 and 5 cm. The average layer thickness in this case is found as the arithmetic mean:
(1+2+4+5)/4=3 cm.
In old apartments, it is not uncommon for the walls to be littered unevenly, and it will be quite difficult to install beacons. But otherwise it is not possible to calculate how much material is required for each square meter of surface.
In new buildings, the walls rarely deviate from the vertical plane by more than 20–25 mm. In these cases, a thin leveling layer will be required, therefore, the consumption of plaster per 1m2 will be small.
Note! In any case, the thickness of the layer cannot be less than the thickness of the beacon. The standard beacon profile has a thickness of 6 mm, and this should be taken into account when calculating the required amount of plaster mixture.
The dependence of the consumption of the mixture on the type of plaster
Having determined the average value of the leveling layer, it is possible to calculate the required amount of material depending on the type of plaster mixture used. The packaging must indicate how much material is required to form a leveling layer of 1 cm on a surface of 1 m2. This value should be multiplied by the average thickness of the plaster obtained earlier, and by the number of square meters of the surface to be leveled.
Characteristics of various types of plasters and approximate consumption rates
Each type of plaster mixture has its own characteristics, and the consumption of material per 1 m2 of surface can vary significantly.
- plaster - durable, dries quickly, very easy to use, but for the most part not suitable for wet rooms. Approximate consumption - 9 kg per square meter with a thickness of 1 cm.
- Cement - universal, moisture resistant, can be applied to concrete, brick and even old plaster. Suitable for any room, including bathroom, kitchen and outdoor balcony.Consumption is the largest - 17 kg / m2.
Working with a cement composition is quite difficult, so many owners prefer to trust specialists who offer services for applying plaster mortar by machine.
Knauf Rotband
"Rotband" is a popular, affordable and high-quality gypsum mixture, optimal for manual application. The layer thickness should not exceed 5 cm. The amount required for processing 1 m2 in a 1 cm layer is 8.5 kg.
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Packed plaster in 30, 10 and 5 kg
Volma Layer
"Volma" is another well-known plaster in the circles of finishers, high-quality and inexpensive. The cement-based composition is used for rough leveling, the material consumption reaches 12 kg / m2. Gypsum plaster mixture "Volma" is used for processing walls and ceilings for painting or wallpapering and does not require subsequent puttying. Consumption - 8–9 kg / m2.
Gypsum plaster "VOLMA-Sloy" is intended for finishing work manually indoors. It perfectly fills potholes, helps to smooth out uneven walls, as it can be applied in a layer of 5 to 60 millimeters. After drying, the composition forms an even layer of white color on the surface, which does not require subsequent puttying. This mixture is compatible with a wide range of building materials. You can buy it for application to brick, concrete, aerated concrete, etc.
Advantages:
- Versatility.
- Crack resistance.
- Affordable price.
- Simple application.
Gypsum plaster Knauf Iceberg
Knauf Eisberg gypsum plaster is used for leveling walls and ceilings in dry rooms, repair and restoration work. The material is universal and does not require subsequent puttying. The main component of the building mixture is high-quality gypsum, which is an environmentally friendly and lightweight material.
Consumption: 8.5 kg
Gypsum plaster cannot be used in conditions of high humidity, otherwise it is universal and can be used for different bases:
- concrete of different structure (dense and cellular);
- cement plaster;
- stone and brick;
- expanded polystyrene and CSP.
Advantages of gypsum plaster
The material "breathes", regulates the amount of moisture in the air, absorbing it in excess and releasing it in deficiency. Creates a favorable microclimate in the room.
The mixture is plastic and easy to apply, it is easier to work with it than with other types of plaster.
The coating provides good heat and sound insulation. The consumption of gypsum mixture is much lower compared to cement.
Packed in 30 kg
Gypsum plaster Unis Teplon
Plaster white "UNIS Teplon" is suitable for interior decoration of walls and ceilings. After drying, it forms a smooth glossy surface and does not require the application of putty. Perlite, which is part of the mixture, makes it light and increases heat-shielding characteristics.
Material Features:
- Suitable for sealing joints and cracks up to 7 cm deep.
- Layer when applied without a grid on the wall - up to 5 cm.
- The layer when finishing the ceiling is up to 3 centimeters.
- The solution must be used within 50 minutes.
- Consumption when applying a layer of 1 cm - up to 10 kilograms per square meter.
Advantages of gypsum plaster "UNIS Teplon":
- Light.
- Seizes within 3 hours.
- Breathe.
- Does not require an additional finishing layer.
- Resistant to cracks.
Packing 30 kg
Decorative plaster "Bark beetle"
It is used only as a finishing coat, giving the surface a resemblance to wood, which has the characteristic spectacular grooves left by the wood borer. Approximate consumption - from 2 to 5 kg per 1 square meter (depending on the manufacturer) with a thickness of 1 mm.
Venetian plaster
Expensive, elite decorative plaster, applied in a very thin layer, may well replace wallpaper. For 1 square meter you will need only 70-200 g of material.
Textured plaster
Another type of decorative coating, the required amount varies depending on the composition of the material and the method of application and starts from 1.2 kg.
Final calculation of the required amount of material
Using the data on the packaging, it is easy to calculate the amount of dry mix that needs to be purchased.
So, for our example with a wall with an area of 12 m2 and a calculated average layer thickness of 3 cm, when using gypsum plaster, we get:
3 x 9 x 12 = 324 (kg)
- If the dry mix is supplied in 30 kg bags, 11 bags will need to be purchased.
- For packaging of 25 kg - 13 bags.
- For material in 50 kg bags - 7 pieces.
- Small 10-kilogram packages will need to buy 33 pieces.
It is better to buy consumables with a small margin so that you do not have to urgently go to the store if there is not enough plaster mix. And the material of the desired manufacturer may simply not be available. It is better to buy an extra bag, the surplus can always be used elsewhere.
Thus, having correctly made all the calculations, you can determine the necessary budget for repair work, the amount of material purchased and not spend extra money.
