ASTM E492 - 09

    Standard Test Method for Laboratory Measurement of Impact Sound Transmission Through Floor-Ceiling Assemblies Using the Tapping Machine

    Active Standard ASTM E492 | Developed by Subcommittee: E33.03

    Book of Standards Volume: 04.06


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    Significance and Use

    The spectrum of the noise in the room below the test specimen is determined by the following:

    The size and the mechanical properties of the floor-ceiling assembly, such as its construction, surface, mounting or edge restraints, stiffness, or internal damping,

    The acoustical response of the room below,

    The placement of the object or device producing the impacts, and

    The nature of the actual impact itself.

    This test method is based on the use of a standardized tapping machine of the type specified in 8.1 placed in specific positions on the floor. This machine produces a continuous series of uniform impacts at a uniform rate on a test floor and generates in the receiving room broadband sound pressure levels that are sufficiently high to make measurements possible beneath most floor types even in the presence of background noise. The tapping machine itself, however, is not designed to simulate any one type of impact, such as produced by male or female footsteps.

    Because of its portable design, the tapping machine does not simulate the weight of a human walker. Therefore, the structural sounds, i.e., creaks or booms of a floor assembly caused by such footstep excitation is not reflected in the single number impact rating derived from test results obtained by this test method. The degree of correlation between the results of tapping machine tests in the laboratory and the subjective acceptance of floors under typical conditions of domestic impact excitation is uncertain. The correlation will depend on both the type of floor construction and the nature of the impact excitation in the building.

    In laboratories designed to satisfy the requirements of this test method, the intent is that only significant path for sound transmission between the rooms is through the test specimen. This is not generally the case in buildings where there are often many other paths for soundsflanking sound transmission. Consequently sound ratings obtained using this test method do not relate directly to sound isolation in buildings; they represent an upper limit to what would be measured in a field test.

    This test method is not intended for field tests. Field tests are performed according to Test Method E 1007.

    1. Scope

    1.1 This test method covers the laboratory measurement of impact sound transmission of floor-ceiling assemblies using a standardized tapping machine. It is assumed that the test specimen constitutes the primary sound transmission path into a receiving room located directly below and that a good approximation to a diffuse sound field exists in this room.

    1.2 Measurements may be conducted on floor-ceiling assemblies of all kinds, 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 prescribes a uniform procedure for reporting laboratory test data, that is, the normalized one-third octave band sound pressure levels transmitted by the floor-ceiling assembly due to the tapping machine.

    1.4 Laboratory AccreditationThe requirements for accrediting a laboratory for performing this test method are given in Annex A2.

    1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.6 This standard does not purport to address 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    C423 Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method

    C634 Terminology Relating to Building and Environmental Acoustics

    E90 Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements

    E336 Test Method for Measurement of Airborne Sound Attenuation between Rooms in Buildings

    E989 Classification for Determination of Impact Insulation Class (IIC)

    E1007 Test Method for Field Measurement of Tapping Machine Impact Sound Transmission Through Floor-Ceiling Assemblies and Associated Support Structures

    E1414 Test Method for Airborne Sound Attenuation Between Rooms Sharing a Common Ceiling Plenum

    E2235 Test Method for Determination of Decay Rates for Use in Sound Insulation Test Methods

    ANSI Standards

    S12.51 Acoustics--Determination of Sound Power Levels of Noise Sources Using Sound Pressure--Precision Methods for Reverberation Rooms

    ISO Standards

    ISO3741 Determination of Sound Power Levels of Noise Sources Using Sound Pressure--Precision Methods for Reverberation Rooms

    IEC Standards

    IEC61672 Electroacoustics--Sound Level Meters--Part 1: Specifications


    ICS Code

    ICS Number Code 91.120.20 (Acoustics in buildings. Sound insulation)

    UNSPSC Code

    UNSPSC Code 30000000(Structures and Building and Construction and Manufacturing Components and Supplies); 30141601(Acoustical insulation)


    Referencing This Standard

    DOI: 10.1520/E0492-09

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM E492-09, Standard Test Method for Laboratory Measurement of Impact Sound Transmission Through Floor-Ceiling Assemblies Using the Tapping Machine, ASTM International, West Conshohocken, PA, 2009, www.astm.org

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