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 town hall's upper section includes a large council chamber, topped by Aalto-designed "Butterfly" trusses that provide structural support for both the roof and ceiling. This arrangement allows for airflow management to counteract seasonal temperature fluctuations.