Property company HSB’s Turning Torso is one of Europe’s tallest residential skyscrapers, 190 metres high with 54 floors. The brainchild of Spaniard Santiago Calatrava, its helical shape has attracted attention worldwide. The building features a particularly complex steel structure, with barely
a right angle to be found anywhere in the entire construction. Its owner, HSB in Malmö, commissioned ÅF-Kontroll to inspect the production and assembly of the structure, including both physical inspections and a review of the documentation. Non-destructive tests were performed, mainly using ultrasound and magnetic powder tests. Despite a number of technical problems and delays due to the weather, the end-result was a success.