Standing high above the South Sea palms that shelter this Caribbean dream, is the stunning roofing of this leisure-centre paradise near Munich.

The most impressive element of the roofing is the cupola over the thermal bath. Astonishingly, it is 56m in diameter and covers an area of 2,500m² without any supports. The cupola can be opened and closed at will, much like the roof of a convertible BMW. However, the magic lies in the fact that there are no additional heavy masses to be moved in the form of glazing, which would prevent this 120-tonne steel structure from being opened at all.

The glazing comprises a lightweight, co-extruded multiwalled sheet in LONGLIFE Makrolon®, approx. 25mm thick, which also provides excellent thermal insulation. This transparent, UV-stabilized polycarbonate sheet has a heat transfer coefficient K of 1.7W/m². K with a weight per unit area of only 3.7kg/m². A ‘No Drop' coating on the underneath of the sheet prevents any dripping from condensation. Essential ‘smart technology' considering the leisure paradise is heated to 38°C via thermal water from a geo-source 2,350m deep.