compartmentalization of buildings is standard practice in architecture design. However, in the case of Grenfell Tower however adequate that compartmentalization may or may not have been, it could not have made any difference on the night of the tragedy.
The fire, smoke and toxic vapour, spread up the outside of the building entering via the windows, flat by flat, floor by floor, walkway by walkway and stairwell by stairwell.
That the compartmentalization of the building was never designed to protect against such a circumstance and therefore the combustible characteristics of the cladding and fixtures surrounding that cladding have been deemed the primary cause of the deaths.
What the inquiry now has to unearth is how and why such volatile materials came to be installed on the outside of the building, and in that will be found the underlying root cause of the disaster.