RAAC

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Background to RAAC

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Reinforced Autoclaved Aerated Concrete also known as RAAC is a lightweight cementitious material that contains no course aggregates. It therefore behaves significantly different to traditional reinforced concrete.

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RAAC was used in commercial and public sector buildings throughout the UK and Europe between 1950 and the mid 1990s due to the popularity of its lightweight, fire resistance and thermal properties. In 1996 structural deficiencies started to become apparent in RAAC Planks typically used in flat roof construction.

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The benefits of the properties of RAAC contribute to a reduction of its structural strength, resulting in deflection and possible risk of sudden collapse as it is susceptible to structural failure when exposed to moisture.

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Following the collapse of a school flat roof in 2018 a safety alert was issued by SCOSS in 2019 titled 'Failure of Reinforced Autoclaved Aerated Concrete (RAAC) Planks' which identified concerns about the structural safety of this form of construction. Further supporting guidance was issued in 2022 by The Institute of Structural Engineers (IStructE) providing further information for the assessment of RAAC panels.

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In August 2023 The Health and Safety Executive (HSE) announced:

 

"RAAC is now life-expired. It is liable to collapse with little or no notice."

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If you need a RAAC Survey Contact Us Today

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