Airborne and impact sound insulation
Airborne sound insulation
The sound insulation measure R describes the reduction in sound transmission through a structural element such as walls, windows, and doors when excited by airborne sound. The improvement of airborne sound insulation ΔR is describes by the increase in the sound insulation measure R of a basic structural element due to a structure being fitted in front of it, such as a facing panel or a double floor.
The airborne sound insulation of smaller structural elements, such as overflow elements or roller shutter casings, is denoted with the normalised sound level difference of the component Dn, e.
Impact sound insulation
The standardised impact sound level is the sound pressure level in a room upon excitation of the ceiling with a standard structure-borne sound source (a so-called standardised forge). The reduction in the impact sound level, ΔL, describes the improvement of impact sound insulation due to a floor covering, such as carpeting or a floating screed.
Flanking sound insulation
Flanking sound transmission occurs when the transmission of sound is not directly through a structural element, but through the flanking elements of a separating element. The normalised flank sound level difference, Dn, f is determined with airborne sound stimulation and the normalised flank impact sound Ln, f is determined with impact noise excitation.
What we offer
Depending on the application and transmission path, we use the following methods for determining airborne and impact sound insulation.
| Measured value/ |
|Testing standard/Evaluation||Testing facility|
Sound reduction index R or Rw
Single value specificaiton for noise barriers DLR
Sound Transmission Loss STL
Sound Transmission Class STC
|Examples: Solid walls, drywalls, roofs, facades, noise protection walls, doors, gates|
|Improvement of airborne sound insulations ΔR or ΔRw|
|Examples: Hollow floors, double floors, facings|
|Normalised sound level difference of the component Dn, e |
or Dn, e, w
|Examples: overflow elements, facade ventilation units|
|Normalised flank sound level difference Dn, f |
or Dn, f, w
|Wall test bench|
|Examples: Hollow floors, double floors , false ceilings, facades|
|Normalised flank impact sound level Ln, f or Ln, f, w|
|Wall test bench|
|Examples: Hollow floors, double floors|
|Impact sound reduction ΔL or ΔLw|
|Ceiling Test bench|
|Examples: hollow floors, double floors, floating screeds, carpeted floors, sports floors|
Transmission factor t
Sound reduction index in the event of perpendicular incident sound R(0)
|ISO 10534-2||Impedance tube|
|Examples: Materials or structural components, e.g. for vehicle manufacturing|
For special measurements, such as the selective determination of sound insulation of sections of a test specimen or the test of very high sound insulation levels, we have access to intensity measurement technology in accordance with ISO 15186. With the help of a robot-driven intensity sensor, we can scan the acoustic emission of the surface of the structural element on the reception room side in a random measuring grid and make the areas of increased acoustic emission visible.