Originally Posted by VocalNeal
Well one would hope the roof has enough slope and vents on the eaves etc. even if using metal.
Yep, but ventilating the eves isn't nearly enough as most Thais like the hip roof design with no ventilation on the top. The way they do it here blocks convection and heat cant escape well enough as hot air rises.
A simple square house with a gable roof, ridge vents AND eve vents allows for complete flow from bottom to top.
Both situations, ventilation systems, etc... are better and cooler with metal roofing. And cheaper...