About Acoustic Insulation

The Difference between Acoustic Absorption and Acoustic Insulation

The terms "acoustic absorption" and "acoustic insulation" are often confusing.


Acoustic insulation will prevent noise from moving from one place to another. It occurs, for example, between two adjoining apartments in the same building. Noise from the traffic in a street entering a room can also be dampened by adequate acoustic insulation. Acoustic insulation essentially blocks sound.


Materials which improve acoustic insulation to minimise sound transfer


  • Heavy materials such as concrete and masonry are highly effective for acoustic insulation. They block sound by deflection. Doubling their surface mass will improve the acoustic insulation by as much as 6dB.
  • Even better is a double-panelled partition wall. The wall's panels should be divided by a space or opening. Good acoustic insulation that minimises sound transfer l deflect will deflect noise to be sent back to where it originated. Consequently, sound insulating materials are traditionally dense and airtight.


Materials which improve acoustic absorption


Sound Absorbent products will reduce the ability of sound to transmit through a surface by absorbing it and converting the sound energy to heat. Acoustic absorption occurs when sound encounters a material which transfers any air particles into heat. This causes the sound to disappear partially or even entirely. Sound absorbing materials have a low weight and open construction.


Sound absorption can be achieved:

  • By reducing the noise inside a room. Curtains, wallpaper, and carpets will mitigate any reverberations and hollow echoes. Placing a suspended ceiling with perforated tiles under an existing one will result in a considerable noise reduction,
  • By improving the acoustic insulation of a double partition wall by inserting mineral wool,
  • By placing chairs or sofas with a fabric cover instead of leather.


Allow Australian Plaster Acoustics to advise you about sound, sound absorption, and acoustic insulation. Our products are designed to offer optimal acoustic insulation and absorption. We have the necessary know-how and experience to turn even the loudest room into an island of tranquillity.

Tip: Acoustic design will achieve its optimum and most cost effective potential when it is considered early in concept or masterplanning stage. The sooner an acoustic engineer is engaged, the higher your chances of avoiding costly retrofit solutions.