Plaster consumption per 1 m2: norm and how to calculate

For the correct, and most importantly, less costly finishing work, the amount of necessary building materials should be pre-calculated. Plaster consumption per 1 m² already pre-determined by the manufacturer, and additionally, the consumption rates were calculated and repeatedly tested back in the Soviet era and prescribed in SNiP. Simple calculations will help you quickly determine the required amount of material. More on everything below.

What normative documents should be used when calculating

The standards for plastering walls were drawn up a long time ago and over the years have been repeatedly tested in practice by many builders. To determine the consumption of material per 1 m² only 2 regulatory documents are required, namely:

• SNiP 3.04.01-87. The standards are specifically designed to determine the thickness and quality of both insulating and finishing coatings.
• Normative indicators of consumption of materials (NPRM) Collection 15.02 Plastering. The collection is quite extensive and is recommended by the Gosstroy of Russia as information material for the development of construction estimates. The norms and types of finishing materials for any surface are given.

Many of the data specified in SNiP 3.04.01-87 or in the more current version of SP 71.13330.2017 are also in the NPRM, but in an abridged version. More to calculate the consumption of regulatory documents is not required.

Recommended conditions before starting work

The consumption specified in the normative documentation is relevant for certain environmental conditions both indoors and outside. Before proceeding with finishing work, you should make sure that:

• Room temperature not less than 10 C⁰. Air humidity – no more than 60%.
• The room is ready for plastering. To do this, it is necessary to maintain the nominal temperature in it for 2 days before work and 12 days after.

Only if the above conditions are met, the consumption of plaster per 1 m² will not exceed the stated in the regulatory documentation.

Permissible plaster layer thickness

To determine such an important parameter as the permissible thickness of the plastered layer, you should look at table 10 of SNiPa 3.04.01-87.

Technical requirements of the regulatory document:

• The thickness of the layer when plastering walls in one layer, for all categories of finishing materials except gypsum, should be 20 mm. When using solutions based on gypsum – 15 mm.
• Thickness at to obryz stone, brick, concrete walls in several layers – 5 mm. Wooden – no more than 9 mm.
  

• When superimposed ground based on cement mortar in several layers, its thickness should be no more than 5 mm. Lime mortar (gypsum is allowed) – 7 mm.

Cover layer when plastering the surface should be no more than 2 mm, but only if it is not a decorative finish – then it is allowed to make it 7 mm.

Calculation of the required amount of the mixture

You can determine the required amount of material for plastering using this method. It is necessary to calculate the average layer thickness for a wall with an area of ​​​​12,5 m². First, the wall is hung in several places, the more they are done, the more accurate the result will be. The results obtained for the curvature of the wall, for example, 1, 4, 2 cm, must be added up and divided by the number of sags, in our case three. We get the middle layer (1+4+2)/3=2,33 cm.

Now you need to calculate the average consumption per square meter and the total amount of material. If you chose Volma-layer for plastering, which has a consumption of 9 kg / m², then we get 9 * 2,33 u20,97d 12,5 kg, this is the average consumption. We multiply it by the total area of ​​​​XNUMX m², 12,5*20,97=262,1 kg.

The mixture is sold in bags of 30 kg, so we consider how many bags you need to buy: 262/30=8,73. The resulting result is rounded up and we get 9 bags. Now it’s easier to calculate how much you need to count on to plaster the wall. You can use the online calculator for the calculation.

Mixture consumption per 1 m² surface

In the collection 15.02 of the NPRM you will find all the tables with the consumption rates of various types of plaster (lime, cement, cement-lime mortar). For ease of understanding, next to the solution, its GOST is indicated, and the consumption of mesh, gypsum and dowels is also additionally given. The inconvenience arises when calculating the amount of mixture per 1 m²when the data is given in relation to 1m³/ 100 m² area.

Consumption for 1 m² with the condition that the material is applied in one layer (layer thickness – 1 cm):

• Gypsum – 9 kg.
• Cement or cement-lime mortar – 17 kg.
• “Rotband”. The main difference between the mixture and the standard gypsum mortar is the presence of additives that improve the setting. The consumption of the mixture “Rotband” per 1 m² is 8,5 kg.
• “Bark beetle”. “Bark beetle” is often used when finishing the facades of buildings and much less often – indoors. This type of plaster has several varieties, but on average its consumption is 3 kg per 1 m².
• Volma. Plaster “Volma” is popular because of the variety of products – there are at least 22 types. One of the most common is Volma-layer, and its consumption is from 8 kg.
• Venetian plaster. It is more suitable as a putty option, since its layer should be very thin, so the consumption of “Venetian” is as economical as possible: 200 g per 1 m².
  

• Vetonite. It has been widely used due to its relatively low consumption. The composition of “Vetonit” mainly includes: cement (base), sand, limestone and microfiber. Consumption: 1,5 kg per 1 m².
• “Teplon”. Gypsum-based plaster is valued for its high environmental friendliness, affordability in terms of pricing and high-quality vapor permeability. Consumption “Teplon” is 1,8 kg.

Important! If the surface is too deformed or there are cracks and potholes, a certain amount of material should be added to the already calculated one. Sometimes it’s just enough to round the estimate number up if it didn’t turn out to be a whole number.

Gypsum plaster according to GOST

Now the most popular mixtures for plastering rooms are made on the basis of such a universal building material as gypsum. But not all manufacturing companies, due to the constant savings of constituent materials, strictly follow the letter GOST. The main regulatory document that precisely specifies the requirements for the manufacture of a gypsum mixture is GOST R 57957-2017.

In GOST, the following are available:

• Notation.
• Types of gypsum plasters.
• Labeling and packaging.
• Thermal conductivity values ​​of the material after it has solidified.

But most often, buyers are not interested in the composition of the plaster, but in its proportions. To find out the components of a dry gypsum mix, just look at GOST 31377-2008, which sequentially describes all the requirements for this product:

• The presence of grains larger than 5 mm is not allowed in the dry mix. GOST allows the presence of grains with a size of 1,25 mm – no more than 1%, 0,2 cm – no more than 12% and 0,125 – no more than 15%.
• Gypsum, which is added to the dry mix, must be made in accordance with GOST 125.
• After adding water to the dry mixture, the setting of the resulting mortar should take at least 45 minutes when applied by hand. When using any technique for application – at least 90 minutes.
• The water-holding capacity should not be less than 95%.

Important! If this GOST is indicated on the box of the purchased mixture, but the quality of the plaster, its curing time or other characteristics do not meet the requirements of the regulatory document, then each buyer has the right to receive monetary compensation.

Plaster Knauf Rotband

Knauf Rotband is very popular among master finishers. Firstly, because of its versatility (suitable for concrete, brick, cement surfaces, as well as for plaster partitions). Secondly, because of its affordable price.

When buying Knauf-Rotband plaster, you should not pay attention to its color, since such products can be white, gray or pink. Different colors and shades of the mixture are given by polymer additives, which are mixed with the main ingredients specifically to give good stickiness to the finished solution.

The consumption of Rotband is much less than cement-based mortars, since gypsum predominates in these products. 8,5 kg of mixture is enough to cover an area of ​​1 mm². The drying of a layer 1 cm thick occurs in no more than 1 hour, but for a full set of strength, the plaster should be allowed to brew for at least 7 days.

Gypsum solutions are whimsical to some nuances, so Rotband has several minor drawbacks:

• The layer of Rotband plaster is inferior in strength to the same layer, but based on the cement component.
• Quickly enters the process with metal parts (nails, screws, screws, self-tapping screws), which leads to their rust. Therefore, yellow stains may appear on the plastered surface over time.
• It is best not to apply Rotband in damp areas.

Important! The building materials market is filled with fakes, which in their appearance and cost practically do not differ from the original. The main sign of unnatural Knauf Rotband plaster is the presence of sand in the package. Such goods should be returned to the seller immediately!