RAAC
HTA was commissioned to conduct a comprehensive Reinforced Autoclaved Aerated Concrete (RAAC) survey
HTA was commissioned to conduct a comprehensive Reinforced Autoclaved Aerated Concrete (RAAC) survey
In 2023, HTA was commissioned to conduct a comprehensive Reinforced Autoclaved Aerated Concrete (RAAC) survey for a residential property in West Wales. While RAAC is most commonly associated with roof planks, this project required a critical assessment of RAAC beams being utilised as a primary load-bearing floor system.
This investigation presented a rare and high-risk scenario: the first documented investigation into a load-bearing RAAC floor. The property’s proximity to a harsh marine environment had accelerated the deterioration of the material. Furthermore, the structural integrity had been compromised by historic damage from various tradespeople and significant beam deflection, creating an immediate safety concern for the occupants.
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HTA’s expert team quickly identified that the beams were in a critical state of failure, moving beyond mere “investigation” to “emergency mitigation.” We provided immediate recommendations for temporary propping to stabilise the structure and make the environment safe. By applying our deep knowledge of RAAC behavior to this unique floor-loading application, we delivered the essential data required to manage a potentially life-threatening structural issue in a residential setting.
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