Reinforced Autoclaved Aerated Concrete (RAAC) was first created in the mid-1920s but its use in the UK and other places became widespread from the mid-1950s to the mid-1990s. It was mainly used in flat roofs, as well as floors and walls, particularly in public and commercial buildings such as schools, hospitals, and government buildings. The material was valued for being lightweight, cheaper, and providing good thermal insulation compared to traditional concrete.
In summary:
- RAAC was invented in the 1920s.
- Widespread use in the UK started in the mid-1950s.
- Continued use until the mid-1990s or early 1990s.
- Primarily used in roofing, flooring, and wall panels in public and commercial buildings.
