Then we divide the result by the weight of the package and get the required number of bags:

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Before plastering, the base is cleaned of dirt, dust and delamination that may prevent the solution from adhering.
Calculation of the amount of plaster
Anyone who has done repairs in an apartment has probably rich people data that workers buy a large number of bags of plaster, but they are still not enough and have to buy more. Although it is not difficult to calculate the number of packages. So, in a bathroom measuring 2 × 3 m and a ceiling height of 2.7 m, the wall area is 27 m² (thrifty owners can reduce this value by the area of ​​the doorway). It was decided to level the surfaces with KNAUF-Unterputz plaster, 1 pack. - 25 kg, mixture consumption for a 1 mm layer is 1.7 kg / m². (Such information is on the packaging.)

First, you need to ask the craftsmen to examine the surface of the walls in your presence using a plumb line or measure with a two-meter level to determine the deviations from the vertical and establish the average thickness of the plaster layer. Let's assume it is 10 mm. To calculate the amount of plaster, we multiply the area of ​​the walls by the consumption (for a layer of 1 mm) and by the average thickness of the plaster layer (also in mm):


Obviously, the more significant the deviations of the walls from the horizontal and vertical, the more mortar will be needed. In addition, plaster is needed for preliminary filling of cracks and sealing of chips. Therefore, it is advisable to round the obtained values ​​up, but remember that to eliminate significant irregularities, it is more effective to use other engineering solutions and moisture-resistant sheet materials.

After leveling the walls in the bathroom or kitchen with cement plaster, the question often arises: after how much time can you start tiling with ceramic tiles and porcelain stoneware? Many finishers mistakenly believe that you just need to wait for the leveling layer to dry. In fact, it is important for the cement plaster layer to gain sufficient strength, which under normal conditions usually occurs within 28 days. In order for the plaster layer to withstand the weight of the tiles and adhesive, installation should begin after this time. Taking into account additional factors (thickness of the plaster layer, characteristics of the adhesive, weight of the lining, etc.), it is sometimes permissible to reduce it to 2-3 weeks.