Thermal and Noise Reduction Performance of the Green Roof System on Metal Sheet Roofs ประสิทธิภาพในการลดอุณหภูมิและเสียงรบกวน

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Kantitut Tubsuwan Pasinee Sunakorn Chanikarn Yimprayoon

Abstract

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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References

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