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Metal roofing is commonly used in Thailand, especially in factory buildings, since it has corrosion resistance, light in weight, and suitable for long spanning buildings, which promote more working space. However, there are some major drawbacks to buildings for occupants such as the overheating problem and the noise from the impact of rain. This research, therefore, examined the potential use of the extensive green roof mat system (weight 25-60 kg/m2) to overcome overheating and rain noise problems. The system was laid over the metal roof on an industrial building. The study observed the thermal and acoustic performances before and after the system was installed. The results showed that the outside surface temperature of the green roof was 30oC lower than the exposed metal roof surface temperature. The indoor temperature was reduced by 2-3oC during the daytime without air-conditioning when compared with the metal roof before green roof installation. For the nighttime, the indoor temperature was decreased by 1-1.5oC in the same scenario. Finally, for the acoustic performance during precipitation, the green roof can reduce the impact noise from rainwater up to 14.5 decibels compared with the impact noise from rainwater directly falling on the metal roof. In conclusion, a green roof can effectively be used to reduce the overheating and noise problems in buildings installed with metal roofing.
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