Use of ISO 717 low-frequency sound insulation descriptors in acoustic regulations and recommendations for housing in Europe
* Presenting author
Most countries in Europe have acoustic regulations for housing, including airborne and impact sound insulation requirements expressed using ISO 717 descriptors. Most requirements use the default frequency range starting from 100 Hz. However, in some of the Nordic countries low-frequency (LF) spectrum adaptation terms 50-80 Hz are included in the regulations and in others recommended.In addition to regulations, national acoustic classification schemes for housing exist in more than ten countries in Europe. The schemes specify a number of quality classes, reflecting different levels of acoustic protection, and include class criteria concerning several acoustic performance areas like in regulations. For the airborne and impact sound insulation criteria in the classification schemes, all five Nordic countries as well as Lithuania and Austria use LF descriptors in the upper classes, but other countries do not.When a high acoustic protection is requested by a builder, one of the upper classes could be recommended as design basis, and use of LF descriptors or not will depend on which national acoustic classification scheme is referred to.The paper will summarize the specific descriptors and limit values for low-frequency descriptors applied in regulations and recommendations for housing, including the higher classes in acoustic classification schemes.