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IP 10/96 Reinforced autoclaved aerated concrete planks designed before 1980
Excessive deflections and cracking have been identified in a number of reinforced autoclaved aerated concrete (RAAC) roof planks and there is evidence of initiation of reinforcement corrosion. However, there is no evidence so far to suggest that RAAC planks pose a safety hazard to building users. This paper describes the difficulties experienced in service with RAAC roof planks designed before 1980. It gives guidance on their identification and initial assessment in buildings. It suggests that roofs incorporating RAAC planks, that were designed before 1980, are inspected and their condition assessed. Although no specific examples of excessive deflections of floors have been reported, it may be wise to inspect RAAC components within floors.
Replaces - BRE Digest 413.
Currie, R. J. and Matthews, S. L.
BRE is a building science centre that generates new knowledge through research. This is used to create products, tools and standards that drive positive change across the built environment. BRE helps its government and private sector clients meet the significant environmental, social and economic challenges they face in delivering homes, buildings and communities. BRE is owned by the BRE Trust, a registered charity. The Trust uses the profits made by the BRE companies to fund research and education that advances knowledge of the built environment.
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The Capitol Building