This building material gained its popularity due to its lightness and strength. However, due to the features of its structure, it needs special decoration. Therefore, to know how to plaster aerated concrete from the inside of the building or outside, you must.
This material is an artificial stone with a low volumetric mass. To protect its cellular structure from external influences, it is necessary to use special plaster. It must necessarily ensure the withdrawal of excess heat and pass the air well. After all, the mentioned material is characterized by a high degree of vaporization.
The plastering mixture is of particular importance when it comes to protecting the outer surface of the walls, for example, the facade of housing construction. Due to the hygroscopicity of the blocks, they are contraindicated for a long (and periodic, too) effect of precipitation. Cracks may even form in unprotected material. The material nourished by moisture is most vulnerable in case of temperature changes. They are the norm for most climatic zones of our country. Therefore, in addition to the plaster mixture, it is necessary to use finishing materials that have water -repellent properties. In general, finishing materials that are used in parallel with blocks from the described material should:
have a high degree of resistance to various kinds of deformations;
be frost -resistant;
have a good adhesion to the base.
In order not to violate the vapor permeability of the blocks, the outer layer should be made at the level of 7-10 mm. The thickness of the inner layer can reach 20 mm. Deviation from these indicators can lead to the appearance of mold, as well as to detach the plastered layer.
We apply a plaster mixture correctly
Now it is necessary to say how to plaster walls from aerated concrete from the inside and outside. It should be understood that this action does not particularly differ from working with surfaces of brick or ordinary concrete. Although, of course, it has its characteristic features.
Firstly, it is advisable to use a special grid as a lining. Particular attention should be paid to areas of the greatest concentration of voltage. Such areas include angles, as well as places under the window sills. You can’t do without a grid.
Secondly, the surface before applying the mixture must be prepared accordingly. For this purpose, primer compounds are used. In principle, their use is advisory in nature. But experts advise to listen to this recommendation and do not save on the primer. Since the described material is characterized by a porous structure, it is better to use deep penetration compositions. Remember, the better the surface is primed, the better the plaster will “fall” on it.
Next, you can start the main job. You need to install beacons on the surface, apply the prepared mixture, check the degree of smoothness of the surface with the rule.