Building material assessed to be at risk of collapse was used in thousands of UK public structures from 1950s to 1990s
“Bubbly” concrete, pioneered in Sweden, swept Europe through the middle of the last century. Known as “aerobar”, “aircrete” and Raac , the cheap lightweight alternative to traditional concrete mixes was used in thousands of UK public buildings from the 1950s to 1990s. By the 1980s it had started to fail and buildings had to be demolished. This is a timeline of who knew what and when.– With an estimated 30-year lifespan, failures among Raac roof panels in 1950s buildings were inevitable.
– The UK’s Building Research Establishment , an executive agency of the government, issued an “information paper” about Raac concrete roof planks installed before 1980 that warned of “excessive deflections and cracking”. There was no evidence “so far” to suggest they posed a safety hazard to building users, but it said Raac could not be expected to have a useful life of much more than 30 years.
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