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Acoustical design of exhibition and event halls is of great importance to achieve good speech intelligibility and acoustic comfort in the hall. However, noise due to rainfall on the roof is rarely addressed. Rainfall noise is of great concern in a country like India due to heavy rainfall during the rainy season. This is even more important in exhibition and event halls as they need to host events all-round the year, sometimes during heavy rainfall conditions. High interior background noise levels in a hall can affect speech intelligibility due to masking effect and speakers will be required speak at a higher volume to be heard clearly. Hence, addressing noise generated by rainfall is of great importance. Noise due to rainfall on roofs is dependent on the rainfall intensity. In this study, we have considered low-intensity rainfall as being 10 mm/hr of rain, medium intensity rainfall as 20 mm/hr of rain and heavy rainfall intensity as 40 mm/hr of rain. The dimensions of the hall and the interior acoustic parameters of the hall such as reverberation time are considered as constant. Only the roof design is varied, and the noise levels achieved in the hall are calculated. Modern lightweight roof constructions consist of a thin metal sheet facing the exterior of the building supported by a metal framework consisting of purlins. In this study, the external sheet exposed to the rain is a 0.6 mm thick steel sheet. The sound power generated due to the rainfall on the external sheet is calculated, the sound isolation due to the roof design is also calculated, and this is used to determine the background noise level achieved in the hall. The roof design consists of various layers of materials underneath the steel sheet which will provide noise isolation for the noise generated due to rainfall on the roof sheet. The background noise criterion to be achieved in the hall with the roof design is considered to be moderately noisy (NC 35 - 45). Several roof designs were considered in this study, and the background noise level developed in the hall due to rainfall on the roof for different rainfall intensities was calculated using computational tools. The background noise levels achieved in the hall for various roof designs for different rainfall intensities are presented in this study.
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