Reverberation control of work spaces and of other living areas in buildings is a specialty of ITS, which has a great experience for many applications.
In relation to regulatory texts and standards, this consists in implementing (in various forms e.g. acoustic suspended ceiling, wall-mounted absorbent lining, screens, baffles and suspended absorbent elements) sound-absorbing materials, in quality, in quantity and in location satisfactory to the objectives and specific constraints of each project: acoustic performance, but also, and depending on the context: lightness and possibilities of fixing on the available supports, resistance to moisture, oxidation, cleanability, decorative function ...
Concerning work premises
The reverberation control aims, for such applications, to reduce the reverberation of noise on partitions when it is likely to significantly increase the level of noise exposure of workers:
- the Decree of 30 August 1990 regulates the decrease of the noise level by doubling the distance at source in the premises (workshops, production facilities) where machinery and apparatuses are to be installed, capable of exposing workers to a level of daily noise level greater than 85 dB (A), whether it is a room empty of any machine or production facility or premises after installation of machinery and production equipment
- the NF S 31080 standard (which is not mandatory) sets acoustic performance levels and criteria by type of space for offices (individual, collective, open space) and associated spaces (meeting / training room) , relaxation area, restaurant): reverberation time and spatial decay rate (as appropriate)
Concerning teaching establishments
The reverberation control aims, for such applications, to limit noise in nursery and elementary schools, colleges, high schools, regional institutions of special education, universities and institutions of higher education, general, technical or professional (public or private), by imposing reverberation time limits:
- the Decree of 25 April 2003 regulates teaching and practical premises, administrations, libraries, information and documentation centers, music rooms, meeting rooms, teachers' rooms, medical premises and infirmaries , multipurpose rooms, dining rooms
Concerning premises in health facilities
The reverberation control aims, for such applications, to limit the noise, by imposing reverberation time limits:
- the Decree of 25 April 2003 regulates the dining rooms, staff rest rooms, public reception areas, accommodation or care spaces, examination or consultation rooms, medical offices or consulting rooms, premises and circulations accessible to the public
Concerning sports halls
The reverberation control aims, for such applications, to reduce the noise:
- the standard NF P 90207 sets maximum permissible values for the reverberation time (depending on the volume) and the sound decay values in space (depending on the area) for rooms reserved for the practice of some sports: gymnastics, athletics, volleyball, handball, basketball, tennis, fencing, table tennis
Concerning institutions for childrens under 6 years
The reverberation control aims, for such applications, to reduce the ambient sound levels:
- in France there is no regulation nor standard, but nevertheless a broad consensus regarding the reverberation time of the atriums, games rooms - and activity - of the different sections, sleeping rooms, offices , medical rooms, staff rooms, halls and stairwells that may be crossed regularly by children
Concerning restaurants, bars, places with amplified music broadcasting
The reverberation control aims, for such applications, to improve the sound comfort:
- in France there is neither a regulation nor a norm but a broad consensus regarding the reverberation time
Concerning operas, theaters, cinemas, concert halls
The reverberation control aims, for such applications, to adjust, with respect to needs whose evaluation is of great complexity, many performance indicators:
- (in addition to the reverberation time) clarity at 50 or 80 ms (C50, C80), early decay time EDT (Early Decay Time), speech transmission index STI, central time TS, definition D50, sound force G, lateral efficiency (LF and CFL).