The town hall is crowned by the council chamber, a double-height space which is capped by the Aalto-designed "Butterfly" trusses. The trusses support both the roof and the ceiling, creating airflow to manage condensation in the winter and heat in the summer.
The municipal building's upper level features a spacious council chamber, which is adorned with Aalto-designed "Butterfly" trusses that double as structural supports for both the roof and ceiling. This design enables natural ventilation to mitigate temperature extremes throughout the year.