About 50% of the incoming solar radiation reaches the surface of the planet. The rest is reflected or absorbed by the atmosphere & clouds, and a small portion is reflected by the oceans and land. When buildings in Malaysia have proper roof insulation, it would provide significant cooling energy savings as the impact of roof insulation will steady periodic outdoor temperature and solar radiation. It will also keep the home and surrounding areas at room temperature, preventing the onslaught of the natural elements from entering.
Dexsteel radiant barrier/foil effectively reflects 97% of solar radiation.