On 21/06/2017 09:16, Roland Perry wrote:


However, the biggest problem is breaching the concrete floors all the
way through the 24 floors, and making sure the sides of the stairwell
are isolated from the flats.

Just build it on the outside and you only need a fireproof walkway from
the core through the bedroom.
it wouldn't be that difficult to continuously cast one in concrete and
there would be no requirement for any other material that could burn
except the fire doors. No windows, no cladding. Put the emergency lights
on the outside with a glass block inserted as you go so no wiring inside.