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there was a warning notice in 2018 because of an episode in a school in kent that alerted schools to how to identify rac and to be aware of it. more guidance was issued in 2021 and 2022 about how to manage raac. and the expert advice at that point was that if it s not in a critical condition, then it s safe to use continue to use rooms that have provided the raac isn t in a critical condition. so just what is different about the type of concrete at the centre of all this? raac to give its full name, is reinforced autoclaved aerated concrete. it s a lightweight concrete that was used in roofs, floors and walls sacross floors and walls across europe between the 1950s and 1990s. raac is a cheaper alternative to standard concrete because it s aerated, or bubbly . however it s less durable with a limited lifespan of around 30 years, and its structural behaviour differs significantly from traditional reinforced concrete. the health and safety authority says raac is now beyond its
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