The atria in the 44m high tower and in one cube extend up to roof level, with an ETFE membrane roof covering in each case. In the tower this resulted in a covered inner court that allows daylight to reach the ground floor. The load-bearing structure of the roof is formed by lightweight, curving circular hollow sections with a diameter of just 244.5mm. Aluminium sections supported clear of this primary structure provide a framework for the 13m x 2.90m to 3.60m ETFE-foil cushions.
To prevent overheating of the interior, these three-layer transparent cushions are printed with patterns of silver dots on the middle and upper layers of the cushions. The upper layer has 16mm dots with a coverage of 50%, but the middle layer 3mm dots with 70% coverage. This lightweight, hardly perceivable design ensures that SKYGARDEN users feel as though they are outside under a blue sky.