Plaster consumption per 1m2

Rybnikov Alexey

It is necessary to calculate the consumption of plaster per 1 m² before starting work. The timing and quality of the finish depend on the accuracy of the calculations. When hiring a team, the calculations are carried out by an experienced specialist. When repairing with your own hands, the home master independently calculates the amount of material. The rate of cement consumption for plaster is determined individually and depends on several factors.

The curvature of the walls affects the flow rate of the mixture

What determines the consumption of material for plastering walls

The sequence of finishing works is as follows: removal of the old coating, elimination of pollution, exposure of beacons, plastering the walls. Count the material consumption after the installation stage of the beacons. Preparatory operations are clearly shown in the photo.

The consumption rate is affected by:

• degree of curvature of the surface;
• the number and depth of depressions;
• the presence of cracks, chips, minor defects;
• type of dry plaster mix.

Lighthouses will help to accurately determine the deviation of the wall from the vertical and the desired thickness of the plaster layer. Walls with a curvature of up to 5 cm are subject to plastering. If the plane deviates more strongly, use drywall, MDF or other materials for vertical alignment. The video in this article introduces the method of accurate calculation of material consumption using a laser level.

Important! The manufacturer's instructions on the packaging of the mixture reports the average volume of the dry composition for processing a square meter of the wall. Round it to a larger number. If a small amount of material can be used for other work, then a shortage is the risk of a complete alteration.

The consumption of materials for plastering walls additionally depends on the percentage of liquid in the solution. Due to the increase in the specific gravity of the mixture, the rate of consumption of dry matter changes.

Consumption rates are indicated on the packaging.

Layer Thickness Calculation Procedure

1. After installing the beacons, determine the points to measure along the faces of the surface deviation. The more points you take for measuring, the more accurate the result will be.
2. At each point, note the magnitude of the deviation; add the numerical values ​​of the measurements arithmetically.
3. Divide the total amount by the number of beacons.

Calculation example:

The wall area is 10 m², the number of lighthouses is 3 pieces, the deviations are 2, 3 and 4 cm. Add up the numerical values: 2 + 3 + 4 = 9. Divide the amount by the number of lighthouses (3). 9: 3 = 3. The layer thickness for such a wall is 3 cm.

If deviations are determined within 1, 2 and 3 cm, the layer thickness will be 2 cm.

Calculation Examples

On walls with deviations of not more than 3 cm, a coating thickness of 2 cm is allowed. Manufacturers of popular grades of stucco mixes indicate packaging rates for a layer with a thickness of 1 cm (8.5 kg). Paper bags weighing 30 kg are a typical commodity form of packaging. For laying a layer with a thickness of 2 cm, the amount of material per square meter will double: 8.5x2 = 17 kg, that is, more than half the bag.

Walls with large deviations require plastering with a thick layer. If you need to apply a layer 3 cm thick, the calculation is as follows: 8.5 kg x 3 = 25.5 kg. Given the margin, a whole bag is spent on such coverage. The calculation of plaster on an area of ​​10 m² gives a value of 255 kg, that is, almost 10 bags.

Beacon Installation

To find out how many bags will be needed for all the work, divide 8.5 kg into 30 kg, you get 0.28. This is the third part of the bag, which will go to cover one square meter of the wall with a layer of 1 cm.

Calculations for various grades of mixtures

Plaster compositions differ in the type of components of the fillers and the size of the fractions. Therefore, when calculating the flow rate, different calculation methods are used.If improved plaster is applied to the walls, consumption rates are calculated depending on the size of the mineral particles, surface properties and layer thickness.

Example 1

Consumption of decorative mixture of the brand "Bark beetle":

• grain with a diameter of 1 mm - from 2.4 to 3 kg per m²;
• grain with a diameter of 2 mm - from 5 to 6 kg per m²;
• grain with a diameter of 3 mm - from 7 to 9 kg per m².

The decorative mixture solution is applied with a layer of 10-30 mm.

Example 2

Heat-insulating plaster - a finishing material with granules of expanded polystyrene foam, foam glass, perlite or vermiculite. The commodity form of packaging is paper bags weighing from 7 to 10 kg. For processing 1 m² of wall with a layer of 2-2.5 cm, 1 bag of material is required. Manufacturers recommend laying the solution in a layer up to 2.5 cm at a time and waiting for complete drying, then apply the next layer. When heat-insulating plaster is used for decoration, the consumption is calculated depending on the total thickness of the layers and the absorbent properties of the surface. The solution is rubbed into the wall or facade, and not sprayed in portions. 5 cm - the maximum allowable thickness of plaster thermal insulation.

Example 3

Rothband gypsum plaster is used for interior decoration. The factory packaging states in what proportions dry plaster is diluted. The consumption of kg per sq m is recommended within 8.5 kg with an average thickness of 1 cm. If the finishing layer is thicker, multiply this indicator in millimeters by 8.5 kg and get a consumption rate of 1 m² when applied manually.

Example 4

The mixture for Venetian plaster is consumed in accordance with the thickness of the coating:

• 30 mm - 210 grams;
• 20 mm - 140 grams;
• 10 mm - 70 grams.

Example 5

Consumption of cement-lime plaster per 1 m2 - 7 kg of dry mix or 5-6 l of the finished solution. This is the average norm for applying a 5 mm thick layer. Recommendations of specialists on the thickness of the coating allow an indicator of 30 mm. A proportional ratio of ingredients ensures quality finishes and economical material consumption. The solution is prepared from 550 kilograms of sand, 40 kg of lime and 50 kg of cement (bag).

Advice! To save, pre-calculate 3-4 material consumption options. The total amount will be affected by the volume and price of the mixture. Keep in mind that the consumption of DSP per 1 sq m of plaster is twice as high as that of the gypsum mixture, and Venetian plaster is the leader in terms of cost-effectiveness (200 grams per layer). Observe proportions when making the mixture yourself. Properly made mortar is guaranteed to reduce the cost of decoration.

The video in this article will help you correctly calculate the required amount of material for decoration.