ASTM E413 - 10

    Classification for Rating Sound Insulation

    Active Standard ASTM E413 | Developed by Subcommittee: E33.03

    Book of Standards Volume: 04.06


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    Significance and Use

    These single-number ratings correlate in a general way with subjective impressions of sound transmission for speech, radio, television, and similar sources of noise in offices and buildings. This classification method is not appropriate for sound sources with spectra significantly different from those sources listed above. Such sources include machinery, industrial processes, bowling allies, power transformers, musical instruments, many music systems, and transportation noises such as motor vehicles, aircraft and trains. For these sources, accurate assessment of sound transmission requires a detailed analysis in frequency bands. A single-number sound transmission rating for building faade elements is given in Classification E1332.

    The single-number ratings obtained can be used to compare the potential sound insulation of partitions or floors tested in laboratory conditions (STC) or the actual sound isolation between different suites in buildings (NNIC, NIC). The rating for a partition built and tested in a building may be lower than that obtained for a partition tested in a laboratory because of flanking transmission or construction errors.

    Note 1—A similar rating procedure, described in ISO 717, provides single figure sound insulation ratings with a frequency range that extends from 100 to 3150 Hz with no maximum deficiency specified at individual frequencies. For most partitions, the two ratings differ by only one or two points.

    1. Scope

    1.1 This classification covers methods of calculating single-number acoustical ratings for laboratory and field measurements of sound attenuation obtained in one-third octave bands.

    1.2 The name given to the single-number rating is assigned by the test method that invokes this classification.

    1.3 Test methods that invoke this classification include:

    1.3.1 Test Method E90The single-number rating is called sound transmission class (STC).

    1.3.2 Test Method E336Single-number ratings are field sound transmission class (FSTC), noise isolation class (NIC), and normalized noise isolation class (NNIC).

    1.3.3 Test Method E596The single-number rating is called noise isolation class (NIC).

    1.3.4 Test Method E1414The single-number rating is called ceiling attenuation class (CAC).

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


    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

    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

    E596 Test Method for Laboratory Measurement of Noise Reduction of Sound-Isolating Enclosures

    E1332 Classification for Rating Outdoor-Indoor Sound Attenuation

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

    ISO Standard

    ISO717 Rating of Sound Insulation for Dwellings


    ICS Code

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

    UNSPSC Code

    UNSPSC Code 30141601(Acoustical insulation)


    DOI: 10.1520/E0413-10

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