A 10 millimetre (insulating) aerogel mat and 40 mm vacuum insulation panels are used as thermal insulation. Even though the building envelope has some oblique angles, about 90 percent of the building could be insulated with standard panels of 60 x 100 cm and half-panels. Custom sized panels were strictly avoided in order to enable simple replacement of defect vacuum-insulated panels if required. In a standard section, the structure achieves a U-value of 0.1 W/(m²·K).