Autoclaved Aerated Concrete - Material Advantages - Sound Insulation
- Effective protection against noise pollution
- NRC 0.15 without additional materials
- Sound insulation is 7dB greater than other building materials of same weight
AAC STC Sound Insulation Values.pdf
AAC, a porous concrete material, provides a sound insulation value of 7dB greater than other building materials of the same weight. AAC's high surface mass coupled with the mechanical vibration energy damping within its porous structure produces a construction material with exceptional sound insulation properties.
The example shows the S.T.C.(1) rating for a typical AAC - wall construction:
Noise control in buildings is of great significance for the health and well-being of the occupants, especially in multi-family dwellings, since they must provide an environment that is restful and relaxing. The building envelope must also maintain privacy for the occupant. Noise control is also an important factor in other types of buildings such as schools, hospitals, hotels and offices. AAC provides a sound insulation value of 7dB greater than other solid building materials of the same weight per surface area. AAC's high surface mass coupled with the mechanical vibration energy damping within its porous structure produces a construction material with exceptional sound insulation properties.
In addition to using a wall material with superior sound insulation properties, it is always essential to construct the wall in a manner that closes off air leaks and paths by which noise can go around or through the assembly. AAC's simple construction methods and details help to eliminate imperfections, which allow sound transmission through the walls, thus providing a final wall assembly which offers superior sound insulation characteristics for the occupant.
Also, it should be noted that the tests conducted with block wall construction will have the same results as AAC - reinforced panels. This is due to the fact that the mass of the material is identical.
The following examples show the Sound Transmission Class (STC) rating for typical AAC - wall constructions according to both ASTM E90 and German Standard DIN 4109:
AAC Test Results in accordance with ASTM E90
AAC Masonry - Double Wall (DIN 4109)
AAC Masonry - Precision Block and Brick Facade (DIN 4109)
Sound absorption is a major characteristic of the overall acoustic performance of a wall, floor or roof system. By using AAC assemblies, the transmission of sound generated from internal sources such as machinery or equipment can be significantly reduce. The following graph indicates the sound absorption of an uncoated / unpainted AAC surface. The excellent Noise Reduction Coerfficient (NRC) for AAC surfaces provides great sound absorption wihtout any additional measures.