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RAAC Integrity Monitoring & Diagnostics

Identify failing aerated concrete panels before catastrophic “sudden drop” collapse.

You cannot manage Reinforced Autoclaved Aerated Concrete (RAAC) by just looking at it. Because of its highly porous nature, moisture silently destroys the internal steel reinforcement, leading to sudden structural failure with zero visual warning. We use advanced, non-destructive diagnostics to map the internal integrity of your RAAC panels, giving you the exact data needed to secure your building.

The Hidden Dangers of Aging RAAC

Installed heavily between the 1950s and 1990s, RAAC has outlived its intended 30-year lifespan. The primary danger isn’t just the weak concrete; it is how the panels were manufactured.

The Core Threats

  • Short Bearing Ends: The transverse rebar often stops short of the support beam, leaving the weakest part of the aerated concrete to carry the entire load.
  • Moisture Ingress: A leaking flat roof turns RAAC into a sponge, triggering rapid, aggressive corrosion of the internal steel.
  • Zero Warning Signs: RAAC panels rarely sag or spall before failing. A painted ceiling can look perfectly structurally sound the day before it collapses.
A leaking flat roof turns RAAC into a sponge, triggering rapid, aggressive corrosion of the internal steel.

Non-Destructive RAAC Scanning (NDT)

Intrusive drilling can further weaken an already fragile panel. We deploy high-frequency Ground Penetrating Radar (GPR), moisture mapping, and deflection monitoring to safely look inside the concrete.

What We Identify

  • Rebar Placement: Verifying if the transverse reinforcement actually extends safely over the bearing supports.
  • Moisture Profiling: Pinpointing trapped water within the aerated bubbles before the steel rusts.
  • Micro-Cracking: Detecting internal shear fractures invisible to the naked eye.

Actionable Data for Structural Propping

We don’t just tell you that you have RAAC; we tell you exactly which panels are in imminent danger. Our reporting provides the critical baseline data your structural engineers need to design remediation strategies.

The “Scan-to-Secure” Advantage
  • Targeted Propping: Stop vacating entire buildings. Our data allows you to identify exactly which individual planks require immediate timber propping.
  • Long-Term Monitoring: For panels deemed currently safe, we can install micro-deflection sensors to track structural shifts over time.
  • Roof Replacement Planning: Get the exact volume and condition mapping required to tender accurate quotes for permanent roof replacement.

The “Sudden Drop” Threat

Because RAAC does not sag or visibly crack, a ceiling can look perfectly safe to the naked eye (left) while hiding critically short rebar and severe moisture ingress at the bearing end (right). GPR scanning is the only way to verify the panel’s safety.

Commission a RAAC Investigation

Do not leave the safety of your public or commercial estate to chance. Speak to our engineering team today to arrange a rapid, non-destructive RAAC identification survey.

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Condition & Corrosion Survey