Sound Insulation

Façade insulation index Rtheta and D2m,nT measurement

The Rtheta and D2m,nT indices, on site, describe the insulation capacity of a building façade element.

The calculation is carried out by comparing the source spectrum, generated by traffic or a speaker, and the receiving room average sound spectrum (after considering background noise effects). The receiving room average reverberation time (getting D2m,nT) or equivalent absorption area (getting Rtr if the source is the traffic or Rtheta if the source is a speaker) can be used as calculation correction factor.

Procedure

Perform the reverberation time measurements

Perform the average reverberation time and the equivalent absorption area calculation

Perform the measurements of single average spectra in average mode

Download the measurement data files into a PC folder.

Click on the Start Analysis button (or select the menu item Analyze -> SOUND INSULATION -> Start).

In the window that opens, select the Sound Insulation Index (DnT -R') measurement and click OK to confirm.

You should create a new project containing all files concerning the processing or open an existing one.

Create the project "D2mnT_index".

The program will ask if you wish to use the single element method, valid when considering only a wall, or the global method, valid when considering more walls.

If you use the global method, you first need to assess the single walls insulation using the single element method.

Save the results and then use the global method on the just saved results.