Development of Perforated Ceiling Structures to Reduce Floor Impact Sound

This study investigated the increase of floor impact sound caused by ceiling air space in test building. Firstly, the change in floor impact sound with and without ceiling air-space was measured. Noise reduction effect of perforated ceiling systems and glass wool at ceiling area was also investigated. It was expected that perforated ceiling systems could reduce air-spring effect in ceiling space. As a result, ceiling air space caused increasement of floor heavy-weight impact sound about 2~4 dB. On the other hands, perforated ceiling with sound-absorbing materials system could reduced heavy-weight floor impact sound by 3 dB