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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.
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.
1.4 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).
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C634 Terminology Relating to Building and Environmental Acoustics
E492 Test Method for Laboratory Measurement of Impact Sound Transmission Through Floor-Ceiling Assemblies Using the Tapping Machine
E1007 Test Method for Field Measurement of Tapping Machine Impact Sound Transmission Through Floor-Ceiling Assemblies and Associated Support Structures
ICS Number Code 91.120.20 (Acoustics in buildings. Sound insulation)
UNSPSC Code 30141601(Acoustical insulation)
ASTM E989-06(2012), Standard Classification for Determination of Impact Insulation Class (IIC), ASTM International, West Conshohocken, PA, 2012, www.astm.orgBack to Top