When converting roofs in old buildings, there is a risk of wood preservatives being contaminated by toxic paints, which are now banned. These highly contaminated wood preservatives were not only used in the roof area and for the exterior. They are not only used in the rooms for which they were intended, but also indoors to paint beams, wooden floors, wooden panels or cladding. They are particularly dangerous to the health of the occupants as they can continue to emit pollutants for decades.
