RAAC Survey : Reinforced Autoclaved Aerated Concrete

Reinforced Autoclaved Aerated Concrete (RAAC) is a lightweight, precast concrete material widely used in construction from the 1950s to the 1980s.

Reinforced Autoclaved Aerated Concrete became popular due to its cost-effectiveness, good thermal insulation, and ease of installation. While most commonly found in roof panels, it can also be present in walls, floors, and ceilings.

RAAC is created by adding aluminum powder to a mixture of cement, lime, and silica, which causes gas bubbles to form and produces a porous, lightweight material.

Steel reinforcements are embedded to provide structural strength.

Key Characteristics of RAAC

Lightweight : Reinforced Autoclaved Aerated Concrete is much lighter than traditional concrete, making it easier to install and reducing the load on the building’s structure.

Porous Structure : The aerated nature of RAAC provides good insulation but makes it more susceptible to moisture penetration.

Shorter Lifespan : Reinforced Autoclaved Aerated Concrete has a shorter lifespan than traditional concrete and can degrade over time, particularly when exposed to moisture or poor maintenance.

Vulnerability to Moisture and Corrosion : The porous structure of RAAC can absorb moisture, leading to corrosion of steel reinforcements, which can compromise structural integrity.

Why Building Owners Should Survey for RAAC

Ensuring Structural Integrity and Safety : Over time, RAAC can degrade, particularly with moisture exposure. Corroded steel reinforcements may lead to sudden structural failure, posing safety risks.

Identifying Potential Hazards : A survey can detect RAAC presence and assess its condition, helping to prevent potential collapses or failures.

Planning Maintenance or Remediation : If RAAC is found, the survey provides critical information for planning repairs, reinforcement, or replacement, aiding in cost and time estimates for remedial work.

Insurance and Liability Considerations : Understanding RAAC conditions can affect insurance coverage and liabilities. Insurers may require proof of safety assessments or planned remedial actions.

Conclusion

Reinforced Autoclaved Aerated Concrete structures have long been a staple in the UK's construction landscape.

However, concerns surrounding their structural integrity necessitate proactive measures.

We offer comprehensive RAAC surveys and reports to help property owners and developers identify and address potential issues promptly.

Contact

For more information on Reinforced Autoclaved Aerated Concrete or to commission a RAAC survey call us on 01603 577 362. To request a call back from a member of the team, please fill in our Contact Us form.