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missing cavities
missing cavity barriers?
Retrofitting sprinklers has apparently got a lot cheaper too, but that's only from media, I don't know anyone who's done it.
The things is compartmentalisation works, on the whole. There are approx 2 high-rise fires a day (in the UK) that don't result in any deaths and you don't hear about and often even in the same block you're unaware of it. The conventional wisdom was that mass exodus carried a higher likelihood of injury and obstructing the fire service, so better to stay put and stay calm. There was also the thinking that reliance on sprinkler systems was risky because as an 'active' measure they could fail to function, so the fire prevention had to be 'built-in'.All of that orthodoxy has now gone. No-one will stay put, for good reason.
Wait until the scandal of missing cavities comes out. It's going to be a lot of buildings.
The whole concept of fire compartmentalisation is going to unravel. We're moving quickly towards fire suppression (sprinklers/misters) per dwelling IMO.