Floor Impact Sound Performance Variation in Old Apartment Housing

The floor impact sound of the apartment house is the most uncomfortable noise among indoor noises. In order to reduce floor impact sound, slab thickness of 210mm or more is applied to apartment buildings. However, since the slab thickness is 120mm ~ 180mm in the old apartment buildings, the performance of heavy impact sound insulation is poor. The old apartment buildings are increased in area in the vertical and horizontal directions through the remodeling. This remodeling should also improve the floor impact sound performance, so it is also important to provide a direction to improve the performance. For this purpose, we investigated the performance variation of the floor impact sound insulation of old apartment buildings. The standard deviation of the flood impact sound level increased with the increase in the frequency. For the heavy impact sound, the analysis result exhibited that the largest standard deviation was found at 50 Hz among the low frequency domain.