Flat Roof Construction
Even the Hanging Gardens of Babylon, one of the Seven Wonders of the World, had a flat roof. It fascinated master builders for centuries and, especially in the Renaissance, inspired many imaginative designs. The garden began to liberate itself from the ground. Plants and pools of water were suddenly translated to the roofs of buildings. Man felt the urge to intervene in the natural order of things.
At the beginning of the 18th century, the prince-bishop in Passau commissioned a garden with trees, bushes and fountains on the roof of his palace. Although tar was known as a building material at that time, it was an elaborate process to joint copper and lead sheets in a watertight manner.
In the 19th century, the cause of the flat roof was greatly advanced in central Europe by the development in 1839 of the Häusler roofing system.