The plaza is a fluid connection between inside and outside. Its exterior ceiling, formed in organic, wave-like shapes, had to fulfil a variety of technical and physical requirements. Following the design wishes of the architect, the construction planning took into account weather conditions, humidity, wind pressure and suction in the wind-exposed location. To cope with these requirements, a lightweight substructure with high corrosion resistance was formed out of bent steel and clad with highly resistant drywall boards. For this application AQUAPANEL® Cement Board Outdoor was the material of choice, which could easily be mounted on the tailor-made sub-structure.