Requirements for the second escape route
The requirements for the second escape route are individually defined by every state or authority and are regulated in the state building regulations (LBO), among others. According to the model building regulations (MB), whenever no additional safety staircase is present, a second escape and rescue route is always necessary and required, which is protected from the ingress of fire and smoke and is part of the first escape and rescue route. This can, for example, be a window that can easily be opened without the use of aids at all times in line with Section 37 of the MBO, with minimum inside dimensions of 0.9 x 1.2 m. According to Section 33 of the MBO, buildings whose second escape route requires fire brigade rescue equipment and where the top edge of the railing, e.g. for reaching certain windows or points more than 8 m above the ground with ladders, can only be erected if the fire brigade has the necessary rescue equipment.