ASTM E1332-22

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Designation: E1332 − 16 E1332 − 22
Standard Classification for
Rating Outdoor-Indoor Sound Attenuation
This standard is issued under the fixed designation E1332; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This classification is part of a set of ratings for the sound isolating properties of materials, building
elements, and structures. It is based on A-weighted reduction of a transportation noise source. Other
ratings include Classification E413 that rates the ability of a partition to reduce speech and other
sounds within a limited frequency range, and Classification E989 that provides a rating method for
comparing the impact-insulation properties of floor-ceiling assemblies.
1. Scope
1.1 The purpose of this classification is to provide a method to calculate single-number ratings that can be used for
assesingassessing the isolation for the from outdoor sound provided by a building or comparing building facade specimens
including walls, doors, windows, and combinations thereof, including complete structures. These ratings are designed to correlate
with subjective impressions of the ability of building elements to reduce the penetration of outdoor ground and air transportation
noise that contains strong low-frequency sound. These ratings provide an evaluation and rank ordering of the performance of test
specimens based on their effectiveness at controlling the sound of a specific outdoor sound spectrum called the reference source
spectrum.
1.2 In addition to the calculation method, this classification defines some ratings not defined in other provides the definition of
the outdoor-indoor transmission class which is not defined elsewhere within ASTM standards. Other standards may such as Guide
E966 define additional ratings based on the method of this classification, one of which is discussed in this classification.
1.3 The rating does not necessarily relate to the perceived aesthetic quality of the transmitted sound. Different facade elements
with similar ratings may differ significantly in the proportion of low and high frequency sound that they transmit, and the spectra
of sources can vary significantly. It is best to use specific sound transmission loss values, in conjunction with actual spectra of
outdoor and indoor sound levels, for making final selections of facade elements.
1.4 Excluded from the scope of this classification are applications involving noise spectra differing markedly from that shown in
Table 1. Thus excluded, for example, would be certain industrial noises with high levels at frequencies below the 80 Hz one-third
octave band, relative to levels at higher frequencies, and any source, including some transportation sources, that does not have a
spectrum similar to that in Table 1. However, for any source with a spectrum similar to that in Table 1, this classification provides
a more reliable ranking of the performance of partitions and facade elements than do other classifications such as Classification
E413.
This classification is under the jurisdiction of ASTM Committee E33 on Building and Environmental Acoustics and is the direct responsibility of Subcommittee E33.03
on Sound Transmission.
Current edition approved Nov. 1, 2016June 1, 2022. Published December 2016August 2022. Originally approved in 1990. Last previous edition approved in 20102016
as E1332 – 10a.E1332 – 16. DOI: 10.1520/E1332-16.10.1520/E1332-22.
This classification may be used in conjunction with Test Method E90 or Guide E966.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
E1332 − 22
TABLE 1 Reference Source Spectrum
One-third Octave Band
Center Frequency, Sound Level, dB
Hz
80 103
100 102
125 101
160 98
200 97
250 95
315 94
400 93
500 93
630 91
800 90
1000 89
1250 89
1600 88
2000 88
2500 87
3150 85
4000 84
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
C634 Terminology Relating to Building and Environmental Acoustics
E90 Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements
E413 Classification for Rating Sound Insulation
E966 Guide for Field Measurements of Airborne Sound Attenuation of Building Facades and Facade Elements
E989 Classification for Determination of Single-Number Metrics for Impact Noise
2.2 ANSI Standard:
ANSI S1.4S1.4-2014/Part 1/IEC 61672-1: 2013 Part 1 – American National Standard Electroacoustics Electroacoustics – Sound
Level Meters – Part 11: Specifications
2.3 ISO Standard:
ISO 532532:1975 Acoustics–Method for Calculating Loudness Levelcalculating loudness level
3. Terminology
3.1 The following terms Terms used in this classification have specific meanings that standard are defined either in Terminology
C634: airborne sound, decibel, impact insulation class, octave band, outdoor-indoor transmission loss, sound insulation, sound
isolation, sound level, sound transmission loss.or within this standard. The definition of terms explicitly given within this standard
take precedence over definitions given in Terminology C634. The definitions within Terminology C634 and this standard take
precedence over any other definitions of defined terms found in any other documents, including other documents referenced in this
standard.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Available from International Organization for Standardization (ISO), ISO Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier, Geneva,
Switzerland, http://www.iso.org.
E1332 − 22
3.1.1 The following terms used in this classification have specific meanings that are defined in Terminology C634: decibel, octave
band, outdoor-indoor transmission loss, sound level, sound transmission loss.
3.2 Definitions:Definitions of Terms Specific to This Standard:
3.2.1 apparent outdoor-indoor transmission class, AOITC(θ), n—of a building façade or façade element, a single-number rating
calculated in accordance with Classification E1332 using measured values of apparent outdoor-indoor transmission loss at a
specified angle θ or range of angles.
3.2.1 The following definitions shall be used in interpretation of this classification for terms that do not appear in Terminology
C634.
3.2.2 apparent outdoor-indoor transmission loss, AOITL(θ), dB, n—of a building façade or façade element, the value of
outdoor-indoor transmission loss obtained on a test façade element as installed, in a specified frequency band, for a source at a
specified angle θ or range of angles as measured from the normal to the center of the specimen surface, without flanking tests to
identify or eliminate extraneous transmission paths.
3.2.2.1 Discussion—
All the sound power transmitted into the receiving room through both direct and flanking paths is attributed solely to the physical
area of the test specimen. If flanking transmission is significant, the AOITL will be less than the actual OITL for the specimen.
3.2.2 outdoor-indoor noise reduction, OINR or OINR(θ), [dimensionless] dB, n—for a specified source angle of incidence or
source sound distribution, the difference between the time-average free-field sound pressure level at the exterior of a façade and
the space-time average sound pressure level in a room of a building exposed to the outdoor sound through that façade.
3.2.2.1 Discussion—
The outdoor-indoor noise reduction was previously referred to as the outdoor-indoor level reduction, OILR. If the result is
measured for a source at a specific angle, or calculated based on outdoor-indoor transmission loss or apparent outdoor-indoor
transmission loss, then the result is OINR(θ), a function of angle. If the result is calculated from values of transmission loss or is
measured with a horizontal line source such as road or air traffic, the OINR is then not a function of horizontal angle though it
maycould be a function of vertical angle for the horizontal line source.
3.2.3 outdoor-indoor noise isolation class, OINIC or OINIC(θ), n—of an enclosed space exposed through a façade to an outdoor
sound, a single-number rating calculated in accordance with Classification E1332 using values of outdoor-indoor noise
reduction.reduction (OINR or OINR(θ)).
3.2.3.1 Discussion—
The OINIC is the overall A-weighted noise reduction that would occur if the source spectrum were that given in Table 1.
3.2.4 outdoor-indoor transmission class, OITC, n—of a building façade or façade element, a single-number rating calculated in
accordance with Classification E1332 using values of sound transmission loss.loss (TL).
4. Significance and Use
4.1 This classification provides a single number rating for transmission loss or noise reduction data that have been measured or
calculated. This rating is based on the difference between the overall A-weighted sound level of the sound spectrum given in Table
1 and the overall A-weighted sound level of the spectrum that results from arithmetically subtracting the transmission loss or noise
reduction data from this spectrum. The spectrum shape is an average of three spectra from transportation sources (aircraft takeoff,
road, road traffic, and diesel locomotive passby). locomotive). A study showed that this classification c
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