I've been talking to a friend in construction and thought I would share his POV about cladding. I haven't read the thread so I apologise if this is going to be repetitive. I just don't have time to read the thread.
Flammable cladding has been standard in England for decades. So has the 2 inch air gap, which allows rain to dry when it gets behind the cladding. Fire breaks are fitted in the air gap to prevent the terrifyingly rapid 'chimney effect' spread which we all saw. Some types of cladding burn more easily and quickly than others, but they all burn. The cheaper cladding typically has a 1 mm skin of aluminium and plastic filler. And plastic, being oil-based, gives off lots of thick, black smoke and poisonous fumes when it burns. When a cladding panel is cut so that something else, e.g. a pipe, can be installed through it, a piece of aluminium trim is added so that the filler continues to be protected inside a complete 'box' of aluminium. Other filler materials are also used, some of them being less flammable. This sandwich-type cheap plastic-filled cladding is on flats for rich and poor, offices, schools, hospitals, shops, factories etc. Not just for refurb, but also for new build. Pretty much every building site you pass has truckloads of the stuff going in - it's light, cheap and easy to fit. If a building is not skinned with expensive brick/stone/concrete/glass (not flammable), it's cladding. All of it flammable, and not that hard to set fire to, especially if you cut off or drill through the aluminium skin and hold a blowtorch to the filling, which is what the last week's shock-horror brand new 'safety tests' seem to consist of. From the media coverage they don't look as if they bear much relation to the accepted industry tests, in which a cooler flame is usually used. After a certain time the flame gets through the cladding. If the cladding can tolerate a flame at a certain temperature for a certain number of minutes before a hole appears allowing the flame through, the test has been passed. That's a gross oversimplication of testing but it gives you some idea.
There's a fire in a tower block pretty much every day. Fridge fires are about as frequent. But there've only been 2 cases of a fire shooting rapidly up the outside of a high rise because the cladding is burning. The other one was in 1999 in Scotland. After it, Scotland got a much tougher law about cladding:
How 1999 Scottish tower block fire led to regulation change - BBC News
BBC News | UK | Fire hits tower block
BBC News | UK Politics | Tower block fire safety fears
Urgent safety probe after tower block fire.
Because of understandable grief/horror/blissful ignorance, some people not in Scotland are saying 'why does everyone live in inflammable buildings, we must evacuate and/or remove the cladding'. Another way to look at it is 'why has this freak occurrence happened for only the 2nd time in 18 years? What was it about this fire and this building which caused the fire to spread? How did a fridge fire get outside the flat and into the cladding? Why didn't the fire breaks in the air gap inhibit the chimney effect?' Nobody knows. We're waiting for the inquiry. We do know, if Panorama was correct, that the fire crew who doused the fire in the flat did not look out of the window to check the cladding. That tells you how improbable the fire was. No doubt that fire crew are feeling pretty bad, but maybe they followed their training to the letter and did the usual excellent job? In the meantime everyone in construction is refusing to be mauled by the press, or by John McDonnell with his talk of murder, so they won't talk about it.