Noise & Heat Reduction
Normally, the coated steel roof sheet will reflect the heat better than the tile roof. Because of the hot and humid environment therefore insulation is an important in order to reduce the heat and also reduce the noises from outside the building, such as rain, thermal expansion, contraction, and other sources. And also insulation is easy to install and cost-saving as well.
Remarks: refer to CSIRO (The Commonwealth Scientific and industrial Research Organization)