Non-Destructive Testing

Non-destructive testing assesses an existing structure without damaging it. It is used to evaluate buildings before refurbishment or change of use, to verify completed works, and for expert assessment where construction records are missing or in doubt.

A rebound hammer gives the surface compressive strength of the concrete, while ultrasonic pulse velocity indicates internal compactness and reveals voids or cracking. A covermeter locates the reinforcement and determines bar diameter and cover thickness — data needed both to verify the design and to assess corrosion risk.

For deep foundations we carry out pile integrity testing, and where a direct measure of strength is required, cores are taken from the structure and tested in compression.