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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 and . 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.
1.3 This classification is applicable only to one third octave band impact noise data obtained using the standard tapping machine described in Test Methods and .
1.4 Test methods that invoke this classification include:
1.4.1 Test Method – the single-number rating is called impact insulation class (IIC).
1.4.2 Test Method – the single-number ratings are called apparent impact insulation class (AIIC), impact sound rating (ISR), and normalized impact sound rating (NISR).
1.4.3 Test Method – the single-number rating is called the change in impact insulation class (ΔIIC).
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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
E2179 Test Method for Laboratory Measurement of the Effectiveness of Floor Coverings in Reducing Impact Sound Transmission Through Concrete Floors
ICS Number Code 91.060.30 (Ceilings. Floors. Stairs); 91.120.20 (Acoustics in building. Sound insulation)
UNSPSC Code 30141601(Acoustical insulation)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM E989-21, Standard Classification for Determination of Single-Number Metrics for Impact Noise, ASTM International, West Conshohocken, PA, 2021, www.astm.orgBack to Top