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. NOTE 1 When the aim of impact sound insulation measurements is to have a strong correlation between a 'real' impact source (e.g. a person walking or children jumping) and an artificial impact source (e.g. a tapping machine), both sources should apply the same input force spectrum, to ensure the correct ranking of floors and floor coverings for the 'real' and the artificial source. This requires the impedance spectra of the sources to be the same. If the 'real' impact source is a walking person without shoes and the artificial source is a standard tapping machine as specified in Clause 4, the correlation is not strong. ISO/DIS 10140-5:2008, Annex F presents a proposed modification of the standard tapping machine to make its dynamic source characteristics similar to that of a walking person without shoes and a heavy/soft impact source with dynamic source characteristics similar to that of children jumping.