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This document specifies laboratory methods for measuring the impact sound insulation of floor assemblies. The test results can be used to compare the sound insulation properties of building elements, to classify elements according to their sound insulation capabilities, to help design building products which require certain acoustic properties, and to estimate the in-situ performance in complete buildings. The measurements are performed in laboratory test facilities in which sound transmission via flanking paths is suppressed. The results of measurements made in accordance with this document shall not be applied directly to the field situation without accounting for other factors affecting sound insulation such as flanking transmission, boundary conditions, and loss factor. A test method is described that uses the standard tapping machine (defined in ISO/DIS 10140-5:2008, Annex E) to simulate impact sources like human footsteps when wearing shoes. This document is applicable to all types of floors (whether heavyweight or lightweight) with all types of floor coverings. The test method applies only to laboratory measurements. An alternative method using a heavy/soft impact source is introduced in Annex A (informative), for assessment of impact sound insulation of a floor against impact sources with strong low frequency components such as human footsteps (bare feet) or children jumping. Alternative impact sources (including the heavy/soft impact source) are defined in ISO/DIS 10140-5:2008, Annex F. A method to test floor coverings is described in ISO/DIS 10140-1:2008, Annex H for single or multi-layer floor coverings installed on specific reference floors. In the case of multi-layer coverings, they may be factoryassembled or assembled at the test site.