Provisions for dwellinghouse with one storey more than 4.5 m above ground level

In a dwellinghouse with only one storey more than 4.5 m above ground level – (a) the top storey should – (i) be separated from the lower storeys by fire-resisting construction; and (ii) have an alternative escape route leading to its own final exit; or (b) all storeys above the storey containing the final exit should be served by a protected stairway which either – (i) extends to a final exit as shown in Diagram 2.3(a); or (ii) leads to at least two escape routes at ground level, each leading to a final exit and separated from each other by fire-resisting construction and self-closing fire doors as shown in Diagram 2.3(b).