Soundproof plaster in public areas
Remember how, when you visit a restaurant in the common room, silence seems to fall upon you, though it is permeated with unobtrusive buzz of voices. In the theater, in general, external sounds seem to be cut off, which makes it possible for actors to prove themselves to the fullest. Such an effect is possible only thanks to soundproofing or, as it is also called, acoustic plaster. The first sign of its use is the decorative coating on a water basis, used in public premises. In the restaurant, as well as in the theater and many other social complexes, you can notice that the walls are covered with water-dispersion paint, which is perfectly absorbed into the acoustic plaster and does not clog the pores in it.
Where pores in the plaster - this is a very interesting topic. First of all, let's figure out why plaster gets sound-absorbing properties. Mainly due to light fillers, often granular, the particle size of which does not exceed 5 mm. It can be crushed pumice, vermiculite, expanded clay. Thanks to the hollow fillers, the plaster has an extremely low density. Often an aluminum powder is added to the soundproof plaster, which, as the mixture dries, releases a gas that increases the porosity of the plaster layer. The sound, as you know, is reflected from obstacles, imagine its path in a loose, porous mass - movement, partial reflection from the cavity wall, sound, already weakening moves further, a new cavity and its new wall, weakening. And so to the maximum muffle of sound.
So, thick and dense paints, like enamel, largely clog the pores in the acoustic plaster, because of what its properties deteriorate .Perhaps, it is because of mistakes with the method of coating( enamel, wallpaper) that many people consider noise-proof plaster a myth.
Soundproof plaster as an option for finishing the apartment
In apartments sound insulation plays a huge role, given that other people live around your habitat, with your habits that may not suit you. For example, a neighbor musician is able to either please all residents in the house, as in Piekhi's song, or poison their life. Therefore, if the sound-absorbing properties of the material from which the house is built are extremely low( the denser the structure of the walls, the worse the sound insulation), it makes sense to perform the noise-reducing finish yourself.
The walls are covered with acoustic plaster according to standard techniques, however, there are some differences. In particular, for the application of such plaster no beacons are needed, they will become excellent conductors for sound. The thickness of the layer of acoustic plaster should not exceed 2.5 centimeters of , ideally it is enough to be limited to 20 millimeters. To improve the properties of acoustic plaster, you can try to create a layer between the wall and the coating with a tightly stretched at a distance of 0.5 centimeter from the wall of a metal grid with small cells( about 10x10 millimeters).Between the wall and the plaster will remain air pockets, which will only enhance its coating properties.
Soundproof plaster - from the surface preparation to the
result. In order for the acoustic plaster to be applied with one layer to hold well on a vertical surface, the wall is covered with a thin layer of cement-sand mortar as a soil. In the solution it is recommended to add a 10-percent lime paste to increase the viscosity and adhesion( adhesion).When the soil slightly( but not completely) dries, it can be applied soundproof plaster with a smooth, uniform layer about two centimeters thick. If suddenly it turns out that you had to stop working earlier than the wall completely disappeared under the layer of plaster, the edge of the coating should be made one-third thinner than the entire layer, so that later you can continue to apply the plaster overlap. This method avoids the appearance of stitches.
When the plaster is applied, it should not be done in any way, on the contrary, it is necessary to treat the surface with a half-wiper and leave it as it is. Painting acoustic plaster is allowed only water-dispersion paints, often over it in restaurants pulling fabric or apply a wooden lattice, performing purely decorative functions. The same decoration of the walls is permissible in residential premises. If you combine noise insulation plaster with other sound-absorbing materials, you can count on the fact that neighbors will not hear the songs in your performance, and you will not become an involuntary listener of finding out the relationship in the apartment behind the wall.