ASTM E989-06(2012)
(Classification)Standard Classification for Determination of Impact Insulation Class (IIC)
Standard Classification for Determination of Impact Insulation Class (IIC)
SIGNIFICANCE AND USE
4.1 The rating increases as the impact sound attenuation of the floor ceiling structure increases. The rating can be used by architects, builders, and specification and code authorities for acoustical design purposes in building constructions.
4.2 The rating strictly only applies to excitation by the standard tapping machine defined in Test Methods E492 and E1007. It does not deal with low frequency sounds below 100 Hz that are typically generated below lightweight joist floors when they are walked on. Nor does it deal with the squeaking, crunching or rattling sounds that can occur in joist construction when elements in the construction are loose and occupants walk on the floor.
4.3 This classification shall only be used with one-third octave band data.
SCOPE
1.1 This classification provides a method for determining a rating that can be used to compare the levels of impact noise generated by a standard tapping machine and transmitted through different floor-ceiling assemblies.
1.2 The name given to the rating is assigned by the test method that invokes this classification.
1.3 This classification is applicable only to one third octave band impact noise data obtained using the standard tapping machine described in Test Methods E492 and E1007.
1.4 Test methods that invoke this classification include:
1.4.1 Test Method E492 — the single-number rating is called impact insulation class (IIC).
1.4.2 Test Method E1007 — the single-number rating is called field impact insulation class (FIIC).
1.5 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:E989 −06 (Reapproved 2012)
Standard Classification for
Determination of Impact Insulation Class (IIC)
This standard is issued under the fixed designation E989; 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.
1. Scope 3. Terminology
1.1 This classification provides a method for determining a 3.1 The following terms used in this classification are
rating that can be used to compare the levels of impact noise defined in Terminology C634.
generated by a standard tapping machine and transmitted
decibel sound
impact insulation class
through different floor-ceiling assemblies.
level
1.2 The name given to the rating is assigned by the test
octave band
sound insulation
method that invokes this classification.
sound pressure
1.3 This classification is applicable only to one third octave sound pressure level
band impact noise data obtained using the standard tapping
4. Significance and Use
machine described in Test Methods E492 and E1007.
4.1 The rating increases as the impact sound attenuation of
1.4 Test methods that invoke this classification include:
the floor ceiling structure increases. The rating can be used by
1.4.1 Test Method E492 — the single-number rating is
architects, builders, and specification and code authorities for
called impact insulation class (IIC).
acoustical design purposes in building constructions.
1.4.2 Test Method E1007 — the single-number rating is
4.2 The rating strictly only applies to excitation by the
called field impact insulation class (FIIC).
standard tapping machine defined in Test Methods E492 and
1.5 This standard does not purport to address all of the
E1007. It does not deal with low frequency sounds below 100
safety concerns, if any, associated with its use. It is the
Hz that are typically generated below lightweight joist floors
responsibility of the user of this standard to establish appro-
when they are walked on. Nor does it deal with the squeaking,
priate safety and health practices and determine the applica-
crunching or rattling sounds that can occur in joist construction
bility of regulatory limitations prior to use.
when elements in the construction are loose and occupants
walk on the floor.
2. Referenced Documents
4.3 This classification shall only be used with one-third
2.1 ASTM Standards:
octave band data.
C634 Terminology Relating to Building and Environmental
Acoustics
5. Basis of Classification
E492 Test Method for Laboratory Measurement of Impact
5.1 Table 1 lists the sound pressure levels defining the shape
Sound Transmission Through Floor-Ceiling Assemblies
of the reference contour, C(f), for the sixteen one-third octave
Using the Tapping Machine
bands from 100 to 3150 Hz.
E1007 Test Method for Field Measurement of Tapping
Machine Impact Sound Transmission Through Floor-
5.2 To determine the impact insulation rating of a floor
Ceiling Assemblies and Associated Support Structures
ceiling assembly, the impact sound pressure levels, L(f), must
first be rounded to the nearest decibel (dB).
5.3 The reference contour, C(f), is then fitted to the impact
sound pressure levels for the specimen by adding a constant T
to all values of C(f) until the sum of positive differences
This classification is under the jurisdiction of ASTM Committee E33 on
Building and Environmental Acoustics and is the direct responsibility of Subcom-
between the data and the fitted contour for all frequencies is
mittee E33.10 on Vibration.
less than or equal to 32 dB. Stating this criterion as a formula,
Current edition approved Sept. 1, 2012. Published Novembe
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