The objective of an Acoustic Classification Scheme (ACS) for buildings is to specify different quality levels for buildings related to its acoustic performance. The Spanish standardisation building acoustics committee, through its corresponding working group CTN 74/SC2/GT1, has been working in the recent years on the development of an ACS compatible with Spanish building acoustics regulations and based on ISO/NP TS 19488. Recently the consensus of the latest draft revision has been reached and the standard is to be processed by the Spanish standardisation body UNE. The ACS includes criteria for airborne, impact and façade sound insulation, for service equipment noise and for reverberation time. This paper analyses the contents of PNE UNE 74201 draft and the most troublesome issues within it, including a discussion on the assigned values and alternative procedures for verification of compliance.
