Today, improving the acoustic performance of exterior walls, roofs are strongly influenced by their modern construction, consisting of many layers. They all have different elasticity, density of materials, have different losses, which reflect the coefficients. External walls sheathed with gypsum plasterboard and a special layer of elastic fasteners on a wooden crate can absorb sound.
As a sound-absorbing layer of ceilings, exterior walls, usually used basalt, gypsum or fiberglass, sound insulators are foam plastic, polyurethane foam or cork wood sheets for which you need glue for polystyrene foam. The lines of adjacency to the outer wall of interior partitions are best equipped with gaskets made with vibration-dampening fibrous materials. Suspended ceilings with an air gap provide high sound insulation of specific impact type noises.
If the house is located in a quiet place it is enough only the usual insulation of the walls of the building to ensure sound comfort. For a cottage standing in the middle of a noisy district besides the soundproofed walls with a layer of thermal insulation it is also necessary to install a soundproofing finish on each window. When quality, closed windows, street noise is still poisoning your life, you need to improve the acoustic performance of the wall structures, making thicker insulation. This is very important in the fight against unpleasant sounds of low frequency.
Exterior masonry with facing bricks is unlikely to significantly improve acoustic comfort. Serious expenses for building two-layer walls with an air gap will at best reduce noise by no more than 20% in comparison with a one-layer construction. For a serious increase in the sound insulation of the building in operation refuse to increase the thickness of the walls. It is better to use the properties of acoustic materials, for example, special soundproof membranes, but after the appropriate modification of window units.
Membranes that prevent the spread of noise are installed on the inner side of the wall, directly on the surface of the building envelope. The parts of the sound waves not completely absorbed by the outer constructions are to some extent reflected from the inner surfaces of the room. The acoustic material mounted on the inner side of the wall can significantly reduce not only the penetration of outside noise, but also the internal reflected sound that travels through the room.
