ASTM E966-18

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Designation: E966 − 10 E966 − 18
Standard Guide for
Field Measurements of Airborne Sound Attenuation of
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Building Facades and Facade Elements
This standard is issued under the fixed designation E966; 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.
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ε NOTE—Editorial changes were made throughout in April 2011.
INTRODUCTION
This guide provides methods to measure the sound isolation of a room from outdoor sound, and to
evaluate the sound transmission or apparent sound transmission through a particular facade of the
room or an element of that façade such as a window or door. Measurements from outdoors to indoors
differ from measurements between two rooms. The outdoor sound field is not diffuse and the
transmission of that sound through the structure is a function of the outdoor sound angle of incidence.
The outdoor-indoor transmission loss values obtained with this guide are not expected to be the same
as that obtained in laboratory or other tests between two rooms using diffuse incident sound. At this
time, there are insufficient data available to specify a single, standard measurement procedure suitable
for all field situations. For this reason, this guide provides alternative test procedures for the
measurements of facade field level reduction and transmission loss.
This guide is part of a set of standards for evaluating the sound isolation of rooms and the sound
insulating properties of building elements. Others in this set cover the airborne sound transmission loss
of an isolated partition element in a controlled laboratory environment (Test Method E90), the
laboratory measurement of impact sound transmission through floors (Test Method E492), the
measurement of airborne sound transmission in buildings (Test Method E336), the measurement of
impact sound transmission in buildings (Test Method E1007), and the measurement of sound
transmission through a common plenum between two rooms (Test Method E1414).
1. Scope
1.1 This guide may be used to determine the outdoor-indoor noise reduction (OINR), which is the difference in sound pressure
level between the free-field level outdoors in the absence of the structure and the resulting sound pressure level in a room. Either
a loudspeaker or existing traffic noise or aircraft noise can be used as the source. The outdoor sound field geometry must be
described and calculations must account for the way the outdoor level is measured. These results are used with Classification
E1332 to calculate the single number rating outdoor-indoor noise isolation class, OINIC. Both OINR and OINIC can vary with
outdoor sound incidence angle.
1.2 Under controlled circumstances where a single façade is exposed to the outdoor sound, or a façade element such as a door
or window has much lower transmission loss than the rest of the façade, an outdoor-indoor transmission loss, OITL(θ), or apparent
outdoor-indoor transmission loss, AOITL(θ), may be measured using a loudspeaker source. These results are a function of the angle
of incidence of the sound field. By measuring with sound incident at many angles, an approximation to the diffuse field
transmission loss as measured between two rooms can be obtained. The results may be used to predict interior sound levels in
installations similar to that tested when exposed to an outdoor sound field similar to that used during the measurement. The single
number ratings of apparent outdoor-indoor transmission class, AOITC(θ), using AOITL(θ) and field outdoor-indoor transmission
class, FOITC(θ), using OITL(θ) may be calculated using Classification E1332. These ratings also may be calculated with the data
obtained from receiving room sound pressure measurements performed at several incidence angles as discussed in 8.6.
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This guide 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 Sept. 1, 2010Jan. 15, 2018. Published December 2010January 2018. Originally approved in 1984. Last previous edition approved in 20042010
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as E966 – 04.E966 – 10 . DOI: 10.1520/E0966-10E01.10.1520/E0966-18.
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