Farum swimming pool was built in 1979 and later expanded in 2001. The original part was built with a corten steel roof and was poorly insulated. To improve energy consumption, it was decided to remove the existing roof and replace it with a new and contemporary insulated roof construction, as well as the installation of solar panels. The new roof structure results in a smaller additional load but at the same time, new legal requirements for load-bearing capacity verification of the load-bearing concrete decks had to be be taken into account.