Thickness of the minimum layer of simple facade plaster on a brick wall

The minimum layer of plaster is 2-3 mm - usually this is how much material is placed on a plasterboard surface. If the walls are smooth, two layers with a total thickness of up to 15 mm are enough. But when the defects are large, it is necessary to increase it to 20-30 mm or even more. You will learn in detail how to correctly estimate the minimum and maximum values ​​in this article.

Depending on the composition

The layer of plaster depends on the characteristics of the composition, since the mixtures have different fractions and additives:

1. Cement compositions are waterproof and temperature resistant, so they can be used in any room, including outdoors. The minimum layer of plaster on the wall should be 10 mm, and the maximum should be within 50 mm.
2. Gypsum compositions are applied in one step, and the minimum thickness of the plaster is 15 mm. If necessary, a second layer is applied, but in total with the first it should be no more than 25 mm. Moreover, finishing is carried out almost immediately, without waiting for the first one to dry completely.
3. If the composition contains gypsum and sand, it is used only in ordinary rooms with moderate humidity (that is, not in the bathtub or kitchen). In this case, the thickness of the plaster layer should be from a minimum of 10 mm to a maximum of 25 mm. If the differences are very large, an increase of up to 35 mm is allowed. But in this case, it is necessary to strengthen the walls with reinforcing mesh.
4. The clay mixture (with the addition of sand or cement) is highly dense. Therefore, in this case, the minimum thickness of wall plaster is 10 mm for the first layer and 15 mm for the second. The limit (total) value should not exceed 35 mm.
5. Decorative compositions are also not used in large quantities. The minimum layer of cement plaster of this type is 10 mm, and it is also undesirable to lay more of the mixture - the limit is approximately the same (10-12 mm).

There are other types of plasters for which it is useful to learn how to determine the minimum and maximum thickness values:

1. The textured mixture is used for beautiful finishing with patterns. The thickness of the plaster layer on this type of brick is within 20-50 mm.
2. Venetian (marbled) - it is laid in several layers, but the total thickness should not exceed 10 mm.
3. With stone chips - contains large fractions, therefore the thickness of the decorative plaster is quite large: from 30 to 50 mm. The composition can only be applied to a well-prepared surface.

Depending on the wall material

The thickness of the plaster on the brick is determined by SNiP. The documents indicate the requirements depending on the wall material:

1. Concrete surfaces are smooth and have virtually no defects. If there are no or minor differences, the thickness is only 2 mm. If there are distortions, the plaster is covered with a thick layer of 20-30 mm, sometimes 70 mm (but only with the use of reinforcement).
2. Aerated concrete also forms a flat surface, so the minimum layer of cement plaster on the wall is only 2 mm. If there are defects, differences and curvature, it is allowed to increase up to 15 mm, but no more.
3. Cellular concrete is another high-quality material with small differences, so here the minimum layer can be even 2-3 mm, while the maximum is 15 mm.
4. Brick walls often give a strong relief. Therefore, here the minimum layer of cement plaster on the wall is 5 mm, although the average value is close to 20-25 mm. If the differences are significant, reinforcement is used and the indicator is increased to 50 mm.
5. Wood is a material that has poor adhesion to plaster. Therefore, almost always before finishing they put a reinforcing metal or plastic mesh, less often - wooden slats. The treatment is carried out in 2 layers: up to 15 and 20 mm, the first and second, respectively. Therefore, the maximum thickness of facade plaster is a total of 35 mm.
6. Drywall - it is finished for decorative purposes to obtain a smooth surface. Since the material is fragile, 2-3 mm is usually enough, with a maximum of only 10 mm.
7. If the insulation is being processed, the mixture should be used in small quantities, because otherwise the material may crack due to the heaviness. The thickness of simple plaster on the first layer should be 15 mm, and on the second - from 10 to 20 mm.

Thus, the minimum layer of gypsum plaster, depending on the material, can be only 2-3 mm. The maximum value varies widely from 10 to 30 mm, less often up to 50-70 mm. The thickness depends not only on the nature of the surface, but also on the technology for performing the work.