Green roofs, covered with vegetation, have been around for centuries. They can reduce heating and cooling costs, absorb rainwater, and provide habitats for wildlife. Notably, the city of Reykjavík, Iceland, is famous for its traditional green-roofed houses.

The earliest known roofs were constructed in ancient Mesopotamia, around 4,000 B.C., featuring mud bricks laid over wooden beams.

Modern technology has introduced solar roofs, where solar panels are integrated directly into the roofing material. This innovation not only generates electricity but also blends more seamlessly with the architectural design compared to traditional solar panels.