Our art nouveau villa was built in 1900 and has a full basement. However, there is another, previously unrenovated cellar beneath the basement. This was used in the past as a vegetable cellar and air raid shelter. The climate is therefore cool and humid. Over the years, leaking pipes on the outside have led to major water damage in this area. For years, rainwater from a roof area of more than 100 square meters ran directly into the masonry. This, of course, had a considerable impact on the building fabric. The steel beams in the basement ceiling are badly rusted and the floor is blown up.