An exact prototype of the roof was submitted to the council for approval and the specially developed green glaze was also agreed. Architect Thomas Weulersse explains: "The seemingly random transition from red to green resembles crocodile skin and was precisely planned in advance". The flat Koramic roof tile allows for a classic beaver tail double-lap pattern, which the architect found most suitable for both the renovated main building and the extension. However, certain challenges related to the ever-increasing slope of the roof had to be overcome: "The trickiest aspect of the job was achieving the draped effect and overcoming the steeper gradients", says the architect.
The roof tile was custom-made for this purpose. Clay roof tiles are often used in Alsace: "Clay stores heat and at the same time keeps the interior cool", says the architect. This low-maintenance tile ages naturally and will blend harmoniously into the townscape – it has proved to be the ideal sustainable solution for the new town hall.