How to determine the strength of the coating and the degree of damage?
In order to begin repairing the plaster of facades and interior walls of the house, it is necessary to determine - what is the degree of damage? And then they are already thinking about how to remove the old plaster. So, to check the reliability of the coating can be a simple way - tapping the hammer on the surface. Ragged plaster produces a sonorous sound, solid - deaf.
There, where it keeps badly, it is beaten, scraped off and scraped off with special scrapers. If the paste is kept too firmly, then it must be soaked with warm water. To do this, brush with a brush until it is completely wet. It is important to remove it completely, since later it can prevent the normal coupling of the mixture to the substrate.
After elimination, the grinding is done, which is the process of grouting the newly applied mixture of plaster. And the composition of the new mass should be identical to the composition of the old coating. At the end of this process, an even, thin film is formed. It is she who closes all the defects, if it does not concern the cracks. A solution for these jobs is kneaded on clean and fine sand. Apply with a float.
Cracked plaster, what to do?
Many are wondering - and why does crack the plaster? There may be several answers. First, cracks in the plaster appear due to the initially poorly prepared base. For example, the old coating was not removed. Secondly, they appear due to improperly selected mixtures. If the plaster is designed for some conditions and surface, but use it for others.
Thirdly, with long operation under the influence of adverse events, they can be formed in a natural way. Fixation of cracks in the plaster is carried out by different methods, depending on their size and depth. To begin with, any cracks expand( eg, small by 5 mm).Remove all remnants of the old plaster.
After that they are "cut" and abundantly moistened with warm water. And only then proceed to sealing with the same solution that was used for the coating itself. An important advantage in such a finish is the patch of the sickle( reinforced tape) along the entire length of the crack. It is laid in a slot and properly shpatlyuyut.
Repair technology for plastering
When renovating old plasters, first of all it is necessary to close the defects( holes on the walls) and cracks. And it's better to use gypsum dough. This was written above. After the cracks are sealed, a primer is applied, which is applied in 2 layers. A primer is made to ensure that the plaster plaster absorbs the least of all the subsequent decorative coating( eg, paint).This will avoid the appearance of spots and streaks.
By the way, plaster coating can be applied both by machine and by hand. In some cases, they make an embedding not with the indicated solution, but simply with gypsum. That is not recommended. This is justified by the fact that the gypsum solution is attached to the base not only by mechanical, but also by chemical method( chemical reaction).When finishing only with gypsum, this does not happen. Therefore, the coating can quickly fall off.
Recommendations! Despite the restoration of the plaster( and not the complete application), it is still necessary to observe the conditions for temperature and humidity. The average air temperature should be about +5 + 30 ° C. And it does not matter whether the repair is done on a coating on which there is decorative plaster or the main one. The rules are valid for all types, including when repairing the coating on which there is Venetian plaster.