Standard Classification for Determination of Outdoor-Indoor Transmission Class

SCOPE
1.1 The purpose of this classification is to provide a single-number rating that can be used for comparing building facade designs, including walls, doors, windows, and combinations thereof. This rating is designed to correlate with subjective impressions of the ability of building elements to reduce the overall loudness of ground and air transportation noise.  It is intended to be used as a rank ordering device.
1.2 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. 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.
1.3 Excluded from the scope of this classification are applications involving noise spectra differing markedly from those described in 4.1. 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. However, for any source with a spectrum similar to those in 4.1, this classification provides a more reliable ranking of the performance of partitions and facade elements than do other classifications such as Classification E413.
1.4 This standard does not purport to address the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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Publication Date
09-Sep-1998
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ASTM E1332-90(1998) - Standard Classification for Determination of Outdoor-Indoor Transmission Class
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: E 1332 – 90 (Reapproved 1998)
Standard Classification for
Determination of Outdoor-Indoor Transmission Class
This standard is issued under the fixed designation E 1332; 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 (e) 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 E 413 that rates the ability of a partition to reduce speech and other
sounds within a limited frequency range, and Classification E 989 that provides a rating method for
comparing the impact-insulation properties of floor-ceiling assemblies.
1. Scope 2. Referenced Documents
1.1 The purpose of this classification is to provide a single- 2.1 ASTM Standards:
number rating that can be used for comparing building facade C 634 Terminology Relating to Environmental Acoustics
designs, including walls, doors, windows, and combinations E 90 Test Method for Laboratory Measurement of
thereof. This rating is designed to correlate with subjective Airborne-Sound Transmission Loss of Building Partitions
impressions of the ability of building elements to reduce the E 413 Classification for Rating Sound Insulation
overall loudness of ground and air transportation noise. It is E 966 Guide for Field Measurement of Airborne Sound
intended to be used as a rank ordering device. Insulation of Building Facades and Facade Elements
1.2 The rating does not necessarily relate to the perceived E 989 Classification for Determination of Impact Insulation
aesthetic quality of the transmitted sound. Different facade Class (IIC)
elements with similar ratings may differ significantly in the 2.2 ANSI Standard:
proportion of low and high frequency sound that they transmit. S1.4 Specifications for Sound Level Meters
It is best to use specific sound transmission loss values, in 2.3 ISO Standard:
conjunction with actual spectra of outdoor and indoor sound ISO 532 Acoustics–Method for Calculating Loudness
levels, for making final selections of facade elements. Level
1.3 Excluded from the scope of this classification are
3. Terminology
applications involving noise spectra differing markedly from
3.1 Definitions—For definitions used in this classification,
those described in 4.1. Thus excluded, for example, would be
certain industrial noises with high levels at frequencies below see Terminology C 634.
the 80 Hz one-third octave band, relative to levels at higher
4. Significance and Use
frequencies. However, for any source with a spectrum similar
4.1 This classification provides the A-weighted sound level
to those in 4.1, this classification provides a more reliable
reduction for a test specimen, based upon the sound spectrum
ranking of the performance of partitions and facade elements
given in Table 1. The spectrum shape is an average of three
than do other classifications such as Classification E 413.
typical spectra from transportation sources (aircraft takeoff,
1.4 This standard does not purport to address all of the
freeway, and railroad passby). A study showed that this
safety concerns, if any, associated with its use. It is the
classification correlated well with the A-weighted and loudness
responsibility of the user of this standard to establish appro-
reductions (see ISO 532) calculated for each of the typical
priate safety and health practices and determine the applica-
spectra for the one-third octave band range of 50 to 5000 Hz.
bility of regulatory limitations prior to use.
The calculated numeric value of OITC is based on the
measured sound transmission loss values for a particular
building facade and depends only on the shape of the reference
This classification is under the jurisdiction of ASTM Committee E-33 on
Environmental Acoustics and is the direct responsibility of Subcommittee E33.03 on
source spectrum used in the calculation. The values shown in
Sound Transmission.
Current edition approved Feb. 23, 1990. Published April 1990. Originally
published as E 1332 - 90. Last previous edition E 1332 - 90 (1994){1. Annual Book of ASTM Standards, Vol 04.06.
2 4
This classification may be used in conjunction with Test Method E 90 or Guide Available from American National Standards Institute, 11 W. 42nd St., 13th
E 966. Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
E 1332
TABLE 1 Reference Source Spectrum TABLE 2 Worksheet for Calculating OITC
One-third Octave Band Column 1 Column 2 Column 3 Column 4 Column 5 Column 6
Sound Level, dB
Center Frequency
Band Reference
A-weighting Column 2 Column 4
80 103 Center Sound Specimen
Correction, + −
Frequency, Spectrum, TL
100 102
f
dB (A ) Column 3 Column 5
f
125 101 Hz dB (L )
f
160 98
80 103 −22.5 80.5
200 97
100 102 −19.1 82.9
250 95
125 101 −16.1 84.9
315 94
160 98 −13.4 84.6
400 93
200 97 −10.9 86.1
500 93
250 95 −8.6 86.4
630 91
315 94 −6.6 87.4
800 90
400 93 −4.8 88.2
1000 89
500 93 −3.2 89.8
1250 89
630 91 −1.9 89.1
1600 88
800 90 −0.8 89.2
2000 88
1000 89 0 89.0
2500 87
1250 89 0.6 89.6
3150 85
1600 88 1.0 89.0
4000 84
2000 88 1.2 89.2
2500 87 1.3 88.3
3150 85 1.2 86.2
Table 1 have an arbitrary reference level.
4000 84 1.0 85.0
4.2 This classification requires sound transmission loss (TL)
(Column 4 / 10)
f
Total Column 4 (dBA) = 10 log ( 10
f
measurements in one-third octave bands from 80 to 4000 Hz.
= 100.13 dB
Due to accuracy limitations given in Test Method E 90 and
(Column 6f / 10)
Total Col
...

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