Fire doors opening to externally but partially enclosed staircases.

[raymac]

1950s purpose built row of flats all with external access. The blocks are separated with ground, first and second floor accessed each by a single staircase that is enclosed at upper floor level but open at ground (so no common areas doors). The flat doors opening to the staircase (enclosed but not internal). I think these should be FD30s fire doors. Any thoughts much appreciated.

Edited August 19, 2020 by raymac
Grammer

[AnthonyB]

With external access areas the usual rule of thumb is FD30 doors where they may need to be passed by other people to escape, assuming walkways do not exceed 2m so overhang doesn't trap smoke.

This situation is a bit of a mix of external and internal factors, this is where the risk assessors expertise comes into play as you have to use your judgement. If the doors have to be passed by others then you are at FD30. If the layout allows smoke logging (such as the enclosed section) then that goes up to FD30s as if fully enclosed.