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Jonathan Slater said that his department warned the government in 2018 that 300 to 400 schools needed to be replaced each year because the reinforced autoclaved aerated concrete used in construction between the 1960s and 1990s only had a design life of 30 to 40 years.
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Just because something has a "design life" of a certain period, does not mean that when it reaches that age it will automatically and suddenly fail.
The school/ buildings where this material was used should be surveyed and assessed, in fact what is the bigger scandal is that such a survey regime was not costed in and already implemented.
It is extremely unlikely that all schools built with this material will need to be knocked down and rebuilt. Some may, some may just need remedial works, some will be just fine.
As usual there is much running around with heads on fire, screaming that the sky is falling.
Unfortunately, what I can predict is that someone will make a lot of money from this!