SWEDISH STANDARD SS 02 52 68 Approved 2001-06-21 Edition 1 Acoustics Sound classification of spaces in buildings Institutional premises, rooms for education, preschools and leisure-time centres, rooms for office work and hotels Byggakustik Ljudklassning av utrymmen i byggnader Vårdlokaler, undervisningslokaler, dag- och fritidshem, kontor och hotell ICS 91.120.20 Language: English Published: September 2003 Copyright SIS. Reproduction in any form without permission is prohibited.
This Swedish Standard was 2001-06-21 approved and published as SS 02 52 68 in Swedish. This document contains an English language version of SS 02 52 68. The two versions are valid in parallel. This document comprises 22 pages. Expert knowledge on this standard is provided by SIS, Swedish Standards Institute, tel +46 8 555 520 00. The standard could be ordered at SIS Förlag AB as well as general information on Swedish and foreign standards. Postal address: SIS Förlag AB, SE-118 80 STOCKHOLM, Sweden Telephone: +46 8 555 523 10. Fax: +46 8 555 523 11 Email: sis.sales@sis.se. Internet: www.sis.se
Page 1 Contents Introduction... 2 1 Scope... 3 2 Normative references... 3 3 Definitions... 4 4 Sound classification of spaces... 5 4.1 Institutional (healthcare) premises... 5 4.2 Rooms for education... 7 4.3 Day centres and after school centres... 10 4.4 Rooms for office work... 12 4.5 Hotels... 14 5 Verification of conformity... 15 Annex A (informative) Guidelines Sound insulating doors... 16 Annex B (informative) Guidelines Sound absorption area... 17 Page
Page 2 Introduction The Swedish Building Regulations BBR are issued by the National Board of Housing, Building and Planning (Boverket). They specify minimum requirements for noise levels and sound insulation in buildings. Most of these requirements refer to conditions in dwellings. Sound classification of dwellings is covered by the Swedish standard SS 02 52 67. The purpose of the standard SS 02 52 68 (hereinafter referred to as the standard ) is to supplement BBR, to enable declarations of quality of different spaces in buildings with respect to the sound climate (sound classification) and to be a tool for consultants. The standard may be used to prescribe sound class in building regulations and project requirements. The listed type of spaces and requirements are generalised and the standard does not pretend to cover all types of space. The requirements in this standard may need adaptation to the actual type of activity and building. The requirements may be applied to tendering procedures but adaptations and clarifications may be needed in an individual case.
Page 3 1 Scope This standard specifies consistent limiting values for airborne sound insulation, impact sound level, sound levels in the building from building services and traffic, sound levels at outdoor areas and reverberation times. These limit values are intended for different types of space in buildings. The types of space covered by the standard are institutional (healthcare) premises, rooms for education, day centres and after school centres, rooms for office work, and common spaces in hotel buildings. For each type of space, four sound classes A, B, C and D are given. These sound classes shall not be mistaken for sound absorption classes, c.f. Annex B. Sound class A is the highest acoustic quality and class D is the lowest. The classes may be characterised: sound class A gives a very high acoustic quality of the building sound class B gives a high acoustic quality of the building sound class C gives an acoustic quality that is typical for existing buildings and also complies with older buildings codes where relevant (Boverkets nybyggnadsregler BFS 1988:18 (NR), KBS Byggnadsstyrelsens anvisningar 10:3 1975 Normer för kontorsbyggnader and SPRI Sjukvårdens utvecklingsinstituts råd 5:24 1976 Akustik i sjukvårdsbyggnader ). sound class D gives a low acoustic quality of the building, intended only when sound class C is not feasible, applicable e.g. to certain rebuilding projects or temporary spaces. In some cases there is no need for two higher sound classes. In these cases, they have been merged into a common higher sound class A/B or common sound class B/C. 2 Normative references SS-EN ISO 140-4 Acoustics Measurement of sound insulation in buildings and of building elements Part 4: Field measurements of airborne sound insulation between rooms. SS-EN ISO 140-7 Acoustics Measurement of sound insulation in buildings and of building elements Part 7: Field measurements of impact sound insulation of floors. SIS-TR 8:2001 Acoustics Measurement of sound insulation in buildings. SS-EN ISO 717-1 Acoustics Rating of sound insulation in buildings and of building elements Part 1: Airborne sound insulation. SS-EN ISO 717-2 Acoustics Rating of sound insulation in buildings and of building elements Part 2: Impact sound insulation. SS 02 52 67 SS-EN ISO 11654 SS 02 52 63 SS 02 52 64 NT ACOU 039 NT ACOU 056 NT ACOU 098 Acoustics Sound classification of spaces in buildings Dwellings Acoustics Sound absorbers for use in buildings Rating of sound absorption Building acoustics Measurement of sound pressure level in rooms Test method. Building acoustics Measurement of reverberation time in rooms Test method. Road traffic Noise. Road traffic Noise Simplified method. Railway traffic Noise.
Page 4 SNV 3298 SNV 4935 BBR Swedish Environmental Protection Agency s publication, Road Traffic Noise. Swedish Environmental Protection Agency s publication, Railway Noise. The Swedish Building Regulations. National Board of Housing, Building and Planning. 3 Definitions 3.1 Airborne sound insulation The ability of a partition (dividing element) between rooms to attenuate airborne sound. It is expressed by the sound reduction index, R, in db (decibels). The sound reduction index varies with frequency. The weighted apparent sound reduction index in buildings R w is used as a single number rating. Alternatively, the single number rating may include the spectrum adaptation term R w + C 50-3150 according to SS-EN ISO 717-1. Measurements shall be made according to SS-EN ISO 140-4 and SIS-TR 8:2001, Acoustics Measurement of sound insulation in buildings. 3.2 Impact sound pressure level The sound pressure level measured in a nearby room when a floor is excited by a standard tapping machine. It is expressed by the normalised impact sound pressure level, L n, in db (decibels). The impact sound pressure level varies with frequency. The weighted normalised impact sound pressure level in buildings L nw is used as a single number rating. Alternatively, the single number rating may include the spectrum adaptation term L nw + C i,50-2500 according to SS-EN ISO 717-2. Measurements shall be made according to SS-EN ISO 140-7 and SIS-TR 8:2001, Acoustics Measurement of sound insulation in buildings. 3.3 Sound level Frequency weighted sound pressure level. A-weighted sound pressure level is denoted L pa (db) and C-weighted sound pressure level is denoted L pc (db). These quantities are usually referred to as db(a) and db(c) respectively. Limits for noise from building services refer to the equivalent sound levels during operation of all building service equipment that generates sound with long term duration. Sound levels during short term operation of the building service equipment may exceed the limits by 5 db. The limiting values refer to furnished room conditions. Note. Sound through floors, walls etc. from building services rooms should be at least 8 db lower than the limiting values according to the table Noise from building services of this standard. Limits for traffic noise refer to average day and night time equivalent sound level or the maximum sound level using time weighting F respectively. Windows shall be closed but air inlets left in the opened position. Maximum sound levels from traffic events that occur less frequently than once per hour may exceed the limits by 10 db. Measurements shall be made according to Swedish standards. The standard SS 02 52 63 and Nordtest methods NT ACOU 056 and NT ACOU 098 are applied indoors. The limiting values refer to room conditions with reverberation times/absorption areas according to the tables of this standard, with doors and windows closed. Sound levels outdoors refer to free field values, i.e. as determined without reflecting effects from the façade. 3.4 Room acoustics The highest values of reverberation time. Limits refer to room volumes less than 1500 m 3. A simplified method for an estimation of the minimum sound absorption area is given in Annex B.
Page 5 3.4.1 Reverberation time The time that would be required for the sound pressure level to decrease by 60 db after the sound source has been stopped. The reverberation time, T (s), depends on the room volume and the sound absorption of the room. Measurements shall be made according to SS 02 52 64. The reverberation time increases with room volume and decreases with increasing sound absorption area. In this standard, limiting reverberation times refer to the highest value of each of the octave bands 250, 500, 1000, 2000 and 4000 Hz as measured in unoccupied furnished rooms (when applicable, otherwise unfurnished room conditions). The value at 125 Hz may exceed the limit value by 20 %. 3.4.2 Sound absorption area The sound absorption area, given by a stated percentage of the ceiling of the actual space, that is covered by an absorbing material with the stated sound absorption class according to SS-EN ISO 11654 (c.f. Annex B). A product with a lower sound absorption class may be applicable if its area is increased correspondingly, c.f. Annex B. In stairs, the coverage percentile refers to the floor area instead of the ceilings area. 4 Sound classification of spaces 4.1 Institutional (healthcare) premises Airborne sound insulation institutional (healthcare) premises Lowest airborne sound insulation between spaces, R' w, (db). Between room / To corridor Hearing examination room 52 / 44 48 / 40 44 / 35 Examination room, consultation room, day room, multi-patient s room Single-patient s room, emergency treatment room 48 / 40 44 / 35 40 / 30 56 / 44 52 / 40 48 /35 Impact sound insulation Institutional (healthcare) premises Highest impact sound pressure level in spaces, L' n,w (db) Hearing examination room 44 48 52 Patient room, examination room, consultation room 60 65 70
Page 6 Room acoustics Institutional (healthcare) premises Highest reverberation times in spaces, T (seconds) Reverberation time Hearing examination room 0.4 0.6 0.8 Single-patient s room 0.8 Multi-patient s room 0.6 0.8 Waiting room, day room, staff room, infants examination room 0.5 0.6 Other types of examination room 0.6 0.8 Conference room, room for rest 0.6 0.8 Kitchen/catering department, scullery, canteen 0.5 0.6 0.8 Room for physiotherapy 0.5 0.6 0.8 Gymnasium, swimming bath 1.0 1.2 1.5 Corridor 0.6 0.8 1.0 Annex B describes a procedure for the estimation of a sound absorption area that corresponds to the reverberation time requirement and gives some advice on the distribution of absorbers. Noise from building services Institutional (healthcare) premises Highest sound level from all services in operation, L pa / L pc (db) Hearing examination room 18 / 30 22 / 35 26 / 35 Examination room, patient room, emergency treatment room 26 / 45 30 / 50 30 / 50 Operating theatre 30 / 50 35 / 55 40 / 60 Consultation room, conference room, offices, room for rest Day room, staff room, canteen, gymnasium, swimming pool, physiotherapy room Corridor, stairs, WC, shower room, dressing room 30 / 50 35 / 55 35 / 55 35 / 50 40 / 55 45 / 60 40 / 60 45 / 60 45 / Kitchen/catering department, scullery 45 / 60 50 / 60 55 / Sound levels outdoors must not exceed L paeq 40 db at nearby residential houses, nor in front of windows to patients room, and 50 db in front of other windows to the institutional (healthcare) building.
Page 7 Noise from traffic - Institutional (healthcare) premises Highest equivalent / maximum sound levels from traffic, L pa (db) Equivalent level / maximum level Hearing examination room 18 / 30 22 / 30 26 / 35 Examination room, patient room, emergency treatment room Consultation room, conference room, office, room for rest Day room, staff room, canteen, gymnasium, swimming pool, physiotherapy room 26 / 40 30 / 45 35 / 50 35 / 50 40 / 55 40 / 55 35 / 50 40 / 45 / 4.2 Rooms for education Airborne sound insulation Rooms for education Lowest airborne sound insulation between spaces, R' w, (db). Between room / To corridor Lecture room (classroom) 48 / 44 44 / 40 44 1) / 35 Common spaces, room for group activities, library, staff room, junior common room 44 / 35 44 1) / 35 40 / 30 Open-plan (landscaped) lecture space 40 / 35 35 / 30 30 / 25 Speech clinic, welfare officer office, psychologist office, school health services 52 / 44 52 / 40 48 / 40 WC, dressing room, shower room etc 44 / 30 44 / 30 40 /25 Music room, drama/stage room 64 2) / 44 60 2) / 40 60 / 35 Headmaster, director of studies, careers advisor, teachers staff (common) room 48 / 40 44 / 35 40 / 30 1) 2) Wall excluding the door. Wall with door 35 db. The limit value refers to R w + C 50-3150.
Page 8 Impact sound insulation Rooms for education Highest impact sound pressure level in spaces, L' n,w db Lecture room (classroom) 56 1) 60 65 Other spaces occupied by pupils or staff 60 1) 65 70 1) Refers to L n,w + C I 50-2500 Room with special requirements, e.g. for woodwork, shops or building services (fan room) should be designed with respect to impact sound and structure borne sound. The influence from or on neighbouring rooms should be carefully considered. Room acoustics Rooms for education Highest reverberation times in spaces, T (seconds) Reverberation time Lecture room (classroom) 0.5 0.6 0.8 Open-plan (landscaped) lecture space 0.4 1) 0.4 1) 0.4 1) Room for group activities, conference room, library, Teachers staff (common) room, staff room, junior common room, canteen, Kitchen/catering department, scullery 0.5 0.6 0.8 Corridor, dressing room 0.6 0.8 1.0 Stairs 0.8 1.0 1.2 Office, room for rest 0.6 0.8 Gymnasium, swimming pool 1.0 1.2 1.5 Room for woodwork, workshops 0.4 0.5 0.6 1) Surfaces shall be designed with respect to furniture, absorbing and reflecting materials applied. Gymnasium, swimming pool etc shall be designed to avoid flutter echoes, e.g. by adding sound absorbing materials on the walls (or by other efficient measures), c.f. Annex B. Annex B describes a procedure for the estimation of a sound absorption area that corresponds to the reverberation time requirement and gives some advice on the distribution of absorbers.
Page 9 Noise from building services Rooms for education Highest sound level from all services in operation, L pa / L pc (db) Lecture room (classroom), assembly hall, conference room, music room 26 / 45 30 / 45 30 / 50 Open-plan (landscaped) lecture spaces 30 / 45 30 / 45 30 / 50 Room for group activities, library, teachers staff (common) room, consultation room, staff room, offices, room for rest Canteen, gymnasium, woodwork and workshop room, lecture kitchens Corridor, staircase, WC/shower room, dressing room 35 / 50 35 / 55 35 / 55 40 / 55 40 / 60 45 / 60 45 / 60 45 / 60 45 / 60 Kitchen/catering department, scullery 45 / 60 50 / 60 55 / Sound levels outdoors must not exceed L pa 40 db at nearby dwelling houses, nor in front of windows of lecture room and 50 db in front of other windows to the school building, and 45 db at recreational areas of the school. Noise from traffic Rooms for education Highest equivalent / maximum sound levels from traffic, L pa (db) Equivalent level / Maximum level Indoor Lecture room (classroom), assembly hall, conference room 26 / 40 30 / 45 30 / 50 Open-plan (landscaped) lecture spaces 30 / 45 30 / 45 30 / 50 Room for group activities, library, teachers staff (common) room, staff room, consultation room, room for rest Canteen, gymnasium, woodwork and workshop room 35 / 50 35 / 50 35 / 55 40 / 55 40 / 55 45 / 60 Outdoor Outside at least one window of each lecture room School yard, more than half of its surface 50 / 65 55 / 70 55 / 75 50 / 55 / 60 /