Every hallway has lots of problems with its floor. It's due to this premise's nature and the heavy traffic with shoes from outside the house. This floor required a complete restoration of all the floorboards. This restoration included precise removal of the upper surface with a sanding machine, then we did a gap-filling, and finally finishing with heavy traffic lacquer. This restoration aimed to recover the floor and protect the flooring for a much longer time (something like 10 years).
The job took about 9 hours.