When Adrian Bejan, a mechanical engineering professor from Duke University, visited the town of Benevento in southern Italy, ...

There are roof shapes and ratios that maximize heat retainment and energy efficiency and, interestingly, ancient Italian architects and builders seemed to know it, too.

His unique sail-shaped design has become a symbol ... The Sydney Opera House’s sail-shaped roof is a stunning example of ...

The origin of the name “jerkinhead” is even more unique than the style ... The end of a roof is formed into a shape intermediate between a gable and a hip; the gable rises halfway to the ...