Expressions of acoustic performance for buildings and construction elements
Acoustic regulation of buildings

Regulatory texts dealing with the acoustic characteristics of buildings use "single values" to express requirements.

For acoustic insulation between rooms, or between the outside space and a room, we find D_nAT (dB(A)), D_nTA (dB), D_nAT,route (dB(A)), D_nTA,tr (dB), R_A.

For impact noise, the sound levels not to be exceeded in reception areas are expressed as L_nAT (dB(A)) or ${\text{L}}_{\text{nTw}}^{\prime }$ (dB).

A number of subtleties in the terms to be used have been introduced since 2000 in the context of European harmonization.

We thought it would be useful to define all these quantities and explain how they are calculated. To keep this section short, we have assumed that the...