Abstract
Noise is radiated directly from the vibrating structure as structureborne noise. A structureborne noise case in a domestic building is described in this paper. The pipes were installed and mounted vertically with little or no insulation between the pipes and the walls. The result was that, every time a toilet was flushed or fresh water was used in one of the units in the building, the water flow and pump noise was heard clearly in the unit directly above the pump room. The family in the unit was very annoyed with the noise, especially in the middle of the night. The measured noise level inside the unit was found to exceed the statutory requirement of 45 dBA (Leq. 30 min) in the night time period (23:00–07:00 h). The solution to this problem was to isolate the pipes and pumps from the walls and floors with resilient materials or hangers to break the vibration channel. Also, the pump operation was limited to only one time within any 30 min in the nighttime period. Finally, the noise level inside the unit was found to meet the statutory requirement.
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