Influence of low frequency bands on airborne and impact sound insulation single numbers for typical Portuguese buildings

The airborne sound insulation tests were performed according to NP EN ISO 140-4 in one-third octave bands from 50 Hz to 5000 Hz. The impact sound insulation tests followed the procedure set out in NP EN ISO 140-7 with measurements in one-third octave bands from 50 Hz to 5000 Hz.