Standard Test Method for Field Measurement of Tapping Machine Impact Sound Transmission Through Floor-Ceiling Assemblies and Associated Support Structures
5.1 The spectrum of the noise produced in
the receiving room by the standard tapping machine is determined by
5.2 The standardized tapping machine
specified in 6.1.1 produces a
continuous series of uniform impacts at a uniform rate on a
floor-ceiling assembly to allow accurate and reproducible
measurements of impact sound pressure levels in the receiving room.
The tapping machine is not designed to simulate any one type of
impact, such as male or female footsteps or to simulate the weight
of a human walker. Also, measurements described in this method and
ratings based on the results are restricted to a specific frequency
range. Thus the subjectively annoying creak or boom generated by
human footfalls on a limber floor-ceiling assembly may not be
adequately evaluated by this test method.
5.3 Laboratory Test Method E492 calls for highly diffuse sound
fields and the suppression of flanking sound transmission in the
laboratory’s receiving room. This field test method does not allow
efforts to suppress flanking. In field tests, acoustical
measurements are much more uncertain than in the laboratory since a
great variety of receiving room shapes and sizes are encountered in
ordinary buildings. Highly diffuse fields are seldom found and the
nature of structure-borne flanking transmission can vary widely. In
addition, energy can be transmitted laterally away from the
receiving room. The amount of lateral transmission of energy can
vary significantly between buildings. Consequently, good agreement
between laboratory tests and field tests on similar floor-ceiling
assemblies should not be expected.
5.4
Several metrics are available for specific uses:
5.4.1absorption normalized impact sound pressure
level (ANISPL) and apparent impact insulation class
(AIIC)—These metrics are intended to evaluate the
performance of the floor-ceiling assembly and adjacent structures
as installed (including structure-borne flanking paths). For these
metrics, sound power from associated support structures are
attributed to the floor-ceiling assembly. Because these are
measures of the apparent performance of the nominally separating
floor-ceiling, the receiving room shall be the space directly under
the tapping machine. ANISPL and AIIC may be reported if the
receiving room has a volume of at least 40 m3 and the
smallest dimension is at least 2.3 m. In rooms of 150 m3
or greater ANISPL and AIIC shall not be determined and reported
unless, in all frequency bands necessary to calculate the AIIC, the
receiving room absorption, A2, is less than:
5.4.2impact sound pressure level (ISPL) and impact
sound rating (ISR)—These metrics are intended to assess the
impact sound isolation as it exists at the time of the test due to
the mechanical excitation of the floor-ceiling assembly by the
standard tapping machine. The measurements can be performed in any
space affected by the sound of the operating tapping machine. These
metrics do not represent the performance of the separating
floor-ceiling. They represent the impact sound isolation between
the source floor and the receiving room. There are no receiving
room absorption restrictions and no receiving room volume
restrictions other than being sufficiently large to accommodate the
microphone positions described in 11.3.
5.4.3reverberation time normalized impact sound
pressure level (RTNISPL) and normalized impact sound rating
(NISR)—These metrics are intended to assess the impact sound
isolation as if the receiving room had a reverberation time of 0.5
s. This reverberation time is typical of many furnished small
offices and furnished residential living rooms and bedrooms.
RTNISPL and NISR shall not be reported for receiving rooms of 150
m3 or larger.
1. Scope
1.1 This test method covers the
measurement of the transmission of impact sound generated by a
standard tapping machine through floor-ceiling assemblies and
associated supporting structures in field situations.
1.2 Measurements may be conducted on all
types of floor-ceiling assemblies, including those with
floating-floor or suspended ceiling elements, or both, and
floor-ceiling assemblies surfaced with any type of floor-surfacing
or floor-covering materials.
1.3 This test method defines several
procedures and metrics to assess either the apparent performance of
the nominally separating floor-ceiling or the isolation of a
receiving room from the sound produced by the operation of the
tapping machine. The receiving room may be the space directly below
the tapping machine or, in some cases, any separated space that
receives sound from the operation of the tapping machine. The
source and receiving rooms as well as the floor-ceiling system are
identified and described in the test report. All measured levels
and derivative single number ratings include the effect of flanking
transmission. Efforts to suppress flanking are not permitted.
Available measures and their single number ratings are the impact
sound pressure levels (ISPL) and impact sound rating (ISR), the
reverberation time normalized impact sound pressure levels
(RTNISPL) and normalized impact sound rating (NISR), and the
absorption normalized impact sound pressure levels (ANISPL) and
apparent impact insulation class (AIIC).
1.4 The ISPL and ISR may be measured and
reported between any two specific rooms or usage areas where the
source room area is large enough to accommodate the tapping machine
positions and the receiving room volume is sufficiently large to
accommodate the microphone positions. For all other measures and
ratings in this standard, restrictions such as minimum room volume
or dimensions or maximum room absorption are imposed. Thus,
conditions may exist that will not allow RTNISPL (NISR) or ANISPL
(AIIC) to be determined.
1.5 Where a separating floor-ceiling
assembly is composed of parts that are constructed differently on
the receiving room (ceiling) side, it is not possible to determine
the ANISPL and AIIC of the individual elements or portions of the
assembly. In this situation, the measurement will be of the
composite structure, not of an individual element.
1.6 Any single field measurement only
represents the performance of the actual assembly tested and cannot
be used alone to accurately predict how an identical or similar
assembly might perform.
1.7 The text of this standard references
notes and footnotes which provide explanatory material. These notes
and footnotes (excluding those in tables and figures) shall not be
considered as requirements of the standard.
1.8 The values stated in SI units are to
be regarded as standard. No other units of measurement are included
in this standard.
1.9This 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 and health practices and determine the
applicability of regulatory limitations prior to use.
2. Referenced Documents
S1.40
S1.11
Electroacoustics - Sound Level Meters
Part 1:Specifications
of Sound Insulation in Buildings and of
Building Elements; Part VILaboratory Measurement of Impact Sound
Insulation of Floors, and Part VIIField Measurements of Impact
Sound Insulation of Floors
Standard Guide for Field Measurements of
Airborne Sound Attenuation of Building Facades and Facade Elements
(Includes all amendments and changes 11/28/2018).
Standard Test Method for Airborne Sound
Attenuation Between Rooms Sharing a Common Ceiling Plenum
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