Acoustic insulation refers to the set of materials, techniques and technologies developed to isolate or attenuate the sound level in a certain space. It is usually achieved by acting on the walls (wall insulation) and windows (acoustic double glazing).

Isolating means preventing a sound from entering or leaving a medium. Therefore, to insulate, both absorbent materials and insulating materials are used. When the acoustic wave hits a construction element, part of the energy is reflected, part is absorbed and part is transmitted to the other side. The insulation offered by the element is the difference between the incident energy and the transmitted energy, and the incident energy is transmitted, minus the sum of the reflected part and the absorbed part.

The materials act in two ways when faced with the incidence of sound, absorption and insulation; It must be pointed out that all materials act more or less in both ways, but in some way both ways of insulating must be distinguished.

There are several basic factors that intervene in achieving good acoustic insulation:.

Sound reflection can also be attenuated by placing a layer of absorbent material on the faces of construction elements, although these techniques belong more properly to the field of acoustics.

Acoustic insulation solutions are designed taking into consideration massive, multilayer and dissipation factors, among others.