A floor system includes multiple floor sections and a floor portion smaller than each of the floor sections. Each floor section includes a floor panel and an integrated securing rail. The floor panel includes opposite first and second edges configured to be arranged next to each other such that the second edge of one floor section is placed facing and adjacent to the first edge of another floor section. The integrated securing rail is fixedly attached to a third edge of the floor panel that extends at a right angle between the first and second edges of the floor panel. The floor portion includes a first outer edge which follows the contour of the integrated securing rail of the first and/or said second floor section and is configured to be adjacent to the integrated securing rail of the first and/or said second floor section during use.