Hi my name is martin I own a flat i a block of 12 i live on the second floor as there are.only 2 floors in the whole building I live on the 2nd floor as.therw is 2 flats on that floor there are.no escape roots to the the top.of the building is a small door mate a triple hazard as there only 2 flat's on that floor 

You wouldn't want to use a roof as an exit as you would then be trapped with fire & smoke of course liking to rise (look at the Joelma Building Fire)

A single protected stair is an acceptable escape route in many situations