Contractors have removed the old, very damaged copper sheeting from the roof of the north wing of the Wilanów Palace. The sheeting was installed during the most recent renovation of the building, carried out in the mid-20th century. The disassembly of the large and very heavy skylights installed in the roof, which have not served their original purpose for a long time, has also begun. The skylights were also installed during the post-war renovation and were intended to provide more light for the painting gallery on the upper level of the north wing. Unfortunately, their improper installation, production and parameters quickly meant that the windows became troublesome for the gallery. Leaks, reinforced glass and the very thick metal sheeting used in the construction of the skylights meant that the windows, which froze over in the winter, caused leaks and allowed water to get inside. In the 1970s, the decision was made to completely cover and insulate these elements.