Significance and Use
The impact sound rating for a floor assembly is determined both by the basic floor assembly and the floor covering on the upper surface. The same floor covering in combination with different basic floor assemblies will not always give the same impact insulation class (IIC) ratings. This test method is designed to provide data that characterize the floor covering alone when installed over concrete slab floors.
The ΔIIC rating calculated in 13.4 is used to compare the effectiveness of different floor coverings on concrete floors.
The impact insulation class (IIC) calculated for the reference concrete floor with a covering provides an indication of the impact sound insulation that the covering will provide with typical, monolithic concrete floors.
When the normalized impact sound pressure levels below a bare concrete slab are known, the difference spectrum calculated in 13.1 may be used to estimate the impact sound pressure levels and hence the IIC that would result if the covering were installed on the slab.
Warning: Difference spectra measured using this method shall not be used to estimate impact sound pressure levels for floors comprising only one or two lightweight floor layers such as oriented strandboard or plywood. Such estimated impact sound pressure levels would be very inaccurate.
Note 1—The difference spectrum calculated in 13.1 gives unreliable estimates of the reduction in impact sound pressure levels due to the floor covering when it is placed on a joist floor incorporating a concrete topping (about 50 mm thick) poured directly on the plywood subfloor or steel deck. The estimated impact sound pressure levels are too low.
This test method closely follows that described in ISO 140-8 except that the single number rating used is the impact insulation class (IIC) described in Classification E 989. The description of the standard concrete floor also differs.
Note 2—The requirement in Classification E 989 that no deviation above the reference contour may exceed 8 dB means that there is no simple relationship between ISO 140-8 test ratings and those generated by this method.
1.1 This test method describes a method for the laboratory measurement of the effectiveness of floor coverings in reducing impact noise from a standard tapping machine through concrete floors. The test results are not necessarily directly related to the subjective evaluations of the floor coverings.
1.2 This test method applies to all floor coverings, whether single or multi-layered, as installed on a standard concrete floor. Multi-layered coverings may be factory-assembled or assembled at the test laboratory.
1.3 The test method applies only to laboratory measurements. It does not apply to the measurement of the effectiveness of a floor covering in a field situation.
1.4 Laboratory Accreditation—A procedure for accrediting a laboratory for performing this test method is given in Method E 492.
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 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.
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
E492 Test Method for Laboratory Measurement of Impact Sound Transmission Through Floor-Ceiling Assemblies Using the Tapping Machine
E966 Guide for Field Measurements of Airborne Sound Attenuation of Building Facades and Facade Elements
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
S1.11 Specification for Octave-band and Fractional-Octave-Band Analog and Digital Filters
ISO140-8Acoustics Measurement of Sound Insulation in Buildings and of Building Elements--Part 8: Laboratory Measurements of the Reduction of Transmitted Impact Noise by Floor Coverings on a Heavyweight Floor
impact insulation class; impact sound insulation; impact sound pressure level; tapping machine; Effectiveness testing; Flooring/floor covering systems (concrete); Impact insulation class (IIC); Impact sound transmission (building elements); Laboratory sound transmission testing; Reducing impact sound transmission; Sound transmission--building materials/applications; Tapping machine method;
ICS Number Code 91.120.20 (Acoustics in buildings. Sound insulation)
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