A typical situation in provincial NZ: Two storey building, small plan footprint (say 150m2) , one internal stair with no inter-floor separation around the stairwell. Cannot use intermediate floor solution.
Need to make each storey a separate firecell which means building a wall around the stair at one of the storeys.
But is a safe path necessary if the DEOP from the upper storey down the stairs to the final exit at the ground storey is compliant? I.e. one open path.
An open path continuation down a stair is commonly used provided there is no meaningful fire load at the bottom of the stair. If there is, or can have, a fire load at the base of the stair then that would make the upper level an intermediate floor.