ASTM E989-89(1999)
(Classification)Standard Classification for Determination of Impact Insulation Class (IIC)
Standard Classification for Determination of Impact Insulation Class (IIC)
SCOPE
1.1 This classification covers the determination of a single-figure rating that can be used for comparing floor-ceiling assemblies for general building design purposes. The rating is called impact insulation class (IIC). This classification is applicable only to one-third octave band impact noise data obtained using the standard tapping machine described in Test Method E492. This rating may be used with data obtained in the laboratory or field.
1.2 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: E 989 – 89 (Reapproved 1999)
Standard Classification for
Determination of Impact Insulation Class (IIC)
This standard is issued under the fixed designation E 989; 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.
1. Scope
1.1 This classification covers the determination of a single-
figure rating that can be used for comparing floor-ceiling
assemblies for general building design purposes. The rating is
called impact insulation class (IIC). This classification is
applicable only to one-third octave band impact noise data
obtained using the standard tapping machine described in Test
Method E 492. This rating may be used with data obtained in
the laboratory or field.
1.2 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 appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Referenced Documents
FIG. 1 Typical IIC Contour (IIC-50)
2.1 ASTM Standards:
E 492 Test Method for Laboratory Measurement of Impact
rating test data based on octave band measurements may cause confusion
Sound Transmission Through Floor-Ceiling Assemblies
and result in erroneous or misleading evaluations. Therefore this classifi-
Using the Tapping Machine
cation cannot be used with octave band data.
3. Significance and Use
4.2 Graphical Determination of IIC—If the normalized
sound pressure levels for the test specimen are plotted in a
3.1 The IIC system rates floor-ceiling structures in ascend-
graph (see Note 2), the impact insulation class may be
ing degrees of impact sound insulation. Thus, IIC values
determined by using a transparent overlay on which the IIC
increasing in magnitude indicate a correspondingly increasing
contour is drawn. The IIC contour is shifted vertically relative
degree of impact sound insulation under tapping machine test.
to the test data until the following conditions are fulfilled: (1)
The IIC rating can be used by architects, builders, and
the sum of the deviations above the contour do not exceed 32
specification and code authorities for acoustical design pur-
dB, and (2) the maximum deviation at a single test frequency
poses in building constructions.
shall not exceed 8 dB. The normalized sound pressure level at
4. Basis of Classification
the intersection of the contour and the 500 Hz ordinate is
subtracted from 110 to obtain the impact insulation class or
4.1 To determine the impact insulation class (IIC) of a
may be read directly from the right-hand ordinate scale (see
floor-ceiling assembly, its normalized impact sound pressure
Fig. 1).
levels in the 16 test frequency bands are compared with those
4.3 Numerical Determination of IIC—Table 1 lists the
of the IIC reference contour. The contour is illustrated in Fig.
normalized one-third octave band sound pressure levels (L )
1andtabulatedinTable1.Thetestfrequencybandsareaseries
n
corresponding to a range of IIC contours. This range may be
of one third octaves centered on 100 to 3150 Hz.
extended upwards or downwards by adding or subtracting
NOTE 1—Use of this classification for the purpose of comparing or
increments of 1 dB. The test data are compared with the rows
of L values given in the table to determine the maximum row
n
This classification is under the jurisdiction of ASTM Committee E-33 on for which the conditions given in 4.2 are met.
EnvironmentalAcousticsandisthedirectresponsibilityofSubcommitteeE33.03on
Sound Transmission.
5. Presentation of Results
Current edition approved July 28, 1989. Published September 1989. Originally
5.1 It is recommended that the test data be plotted in a graph
published as E 989 – 84. Last previous edition E 989 – 84.
Annual
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