In the late 1950s Sonja Henie offered to pay the cost of covering the arena with a roof. This was at the time rejected by the municipality, citing concerns with the venue's architecture being spoiled. However, the lack of a roof placed any event the mercy of the weather, and it gradually became evident that a roof would have to be built. When it was installed in 1971, it was at the cost of the municipality. The stadium was then converted from standing to a seated stands, reducing capacity from 10,000 to under 5,000 spectators. It also saw the removal of the stage. This made it Norway's sixth indoor ice rink. The youth rink, built next to Jordal Amfi, opened in 1989, as the twentieth indoor ice hockey rink in the country. The same year the venue received a series of minor upgrades, followed up with a new ventilation and lighting system in 1993 and a new audio system in 1994.