Platform for an elevator system for a building which is under construction

A platform for an elevator system of a building under construction, the building including an elevator shaft having shaft walls, the elevator shaft becoming taller as the building height increases during a construction phase of the building, the platform comprising:

• a roof structure adapted to be temporarily fixed in the elevator shaft extending horizontally with a gap between the platform and the shaft walls;
• a circumferential sealing arrangement attached to an edge of the platform, the sealing arrangement being movable between a rest position in which the platform is vertically movable in the elevator shaft and an active position in which the sealing arrangement seals or closes the gap between the platform and the shaft walls;
• and
• wherein the sealing arrangement includes side elements adapted to seal against the shaft walls and corner elements adapted to seal against corner regions where two of the shaft walls at right angles enclose a corner of the elevator shaft, and wherein the side elements are struck against the shaft walls by movement of the corner elements to the active position.