Noise pollution within buildings depends on the presence of sources of disturbing noise. The interference may be caused by external sources (ie. Traffic) or internal sources (ie. activity in another room, building services, etc.)
In terms of sound, there are two types of spaces within a building:
There are two types of sound propagation related to buildings:
When a sound wave strikes a surface of a room, a proportion of the sound will be reflected. The remaining sound will be absorbed.The ability of a material to reduce (absorb) acoustic energy (sound) and its transmission to other surfaces (e.g, subflooring) is the value of insulation in acoustics. Acoustic insulation in a building is the difference of sound pressure between a space (emitter) and another neighboring one (receptor). In modern architecture this is best done following the mass-spring-mass principle, by which an elastic material is situated between two solid ones in order to attenuate acoustic vibration, and therefore sound transmission between two spaces.