.IN THE COURSE OF A EUROPEAN building boom that started in the 1960s, an unique type of construction component began to become used. Bolstered autoclaved aerated concrete, known as RAAC, is pre-cast in a manufacturing facility, typically right into planks, before being actually needed to a development web site where it may be promptly set up right into part of a building. Although RAAC is actually still utilized in many parts of the world, Britain is having particular concerns from it. In some buildings the product is actually collapsing in 2018 it induced a school roof covering to failure. A number of universities have actually been shut and also various other properties, consisting of medical centers, are actually impacted. This is actually inducing worry one of everyone as well as a political frustration for the authorities. What is actually RAAC, and also why does it come to be unsafe?