Laboratory testing for the presence of Reinforced Autoclaved Aerated Concrete (RAAC)

Here we discuss what RAAC is and how Kiwa CMT supports structural engineers, building surveyors and facilities managers in the identification of RAAC units.

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What is RAAC and what is the problem?

RAAC (Reinforced Autoclaved Aerated Concrete) is a form of concrete often used in the construction of public buildings from the 1950s to the 1980s. Typically found in roofs, it was also used within walls and floors and is characterised as lightweight and bubbly in composition.

Material and construction deficiencies identified with RAAC have raised concerns regarding performance in structural applications when compared to traditional concrete. With a working lifespan of approximately 30 years, there is a growing need to identify and remediate properties which have RAAC panels installed.

To support this, the Government has recently issued new guidance on how RAAC can be identified and remedied.

How can Kiwa CMT help?

Kiwa CMT can support with RAAC investigations in the following ways:

  • Visual confirmation – this is helpful for initial assessments in properties where little or no documentation is available
  • Destructive site sampling – this involves removing small pieces of the panel for further investigation
  • Non-intrusive site sampling – this causes minimal damage and is necessary where destructive sampling poses high risks
  • Analytical laboratory testing – enables conclusive identification of whether a material is RAAC

With our team of experienced technicians, Kiwa CMT support structural engineers, building surveyors and facilities managers with investigating and identifying whether RAAC is present in a building.

Why use Kiwa CMT for RAAC testing?


Kiwa CMT has extensive expertise built over 40+ years of construction materials testing and inspection.

Service Level

We understand that our clients often need support through the testing process and that responsiveness is key to offering an effective service.

Justify Remediation

If RAAC is present, it can lead to lengthy and costly remediation works. A conclusive laboratory test with Kiwa CMT can support the decision on whether remediation is required.