This part of ISO 140 specifies a laboratory method for measuring impact noise transmission trough floors by using a standard tapping machine. The metchod is applicable to bare floors and also to floors with coverings. The results obtained can be used to compare the impact sound insulation properties of floors and to classify floors according to their sound insulation capabilities. NOTE 1 - Field measurements of impact sound insulation of floors are dealt with in ISO 140-7. NOTE 2 - Laboratory measurements of the reduction of transmitted impact noise by floor coverings on a heavyweight standard floor are dealt with in ISO 140-8.