Non-destructive Testing

Delivering high-quality results using the best tools on the market, CSI is proud to continually develop sciences and technologies to deliver Non-Destructive Testing (NDT) to exceptional standards across New Zealand.


Non Destructive Testing involves the evaluation of existing structures without causing structural damage, with the intention of gaining a better understanding of key structural elements. A reliable structural condition assessment with CSI relies on rigorous observations and collecting accurate data so we can adequately describe the existing condition of the structure. Concrete Structure Investigations have award-winning expertise and the resources to provide you with accurate, independent and innovative non-destructive testing.

Why you May Need Non-Destructive Testing

Scanning is the most frequently used NDT method within CSI, however, there are many others you can find under CSI Services. There are links below within concrete elements in order to determine their structural capacity.

Scanning is primarily used to determine the estimated size and layout of steel reinforcement within concrete elements in order to help determine their structural capacity.

How we do NDT

CSI has a wide range of proven NDT techniques, and are award-winning specialists in the non-destructive testing and inspection industry. Our NDT services include (but are not limited to) drossbach investigation, corrosion testing, material testing, low strain impact integrity tests, pull off/shear tests, quality assurance, structural health and monitoring inspections, unreinforced masonry testing, ultrasonic testing and concrete scanning.



As the name suggests, ultimate tests are carried out until the ultimate strength of the fixing has been reached, and either non-elastic deformation or complete breakage has occurred. Ultimate shear and tensile tests are performed according to British Standard 8539:2012, Section B.2.3.2 – Tests for allowable resistance (statistical approach), using the procedure given in CFA Guidance note: Procedure for site testing construction fixings – 2012. A minimum of 5 shear and 5 tensile tests are performed at each location.


Proof tests are not performed to failure, but instead to a proof load, Np; a specific fraction of the rated loading. Proof tests are performed according to British Standard 8539:2012 Section 3.2 – Tests to validate the quality of installation – Proof tests. The number of fixings to be tested is dependent on the total number to be installed on the job. The standard specifies a minimum of 2.5% or at least 3 fixings per location. If the anchors hold the required load, without movement/deformation/damage to either the fixing anchors themselves or the base material into which they are loaded, they will have met the acceptance criteria. In the event of failure, the number of tests will be doubled within the discrete area of failure.

Any questions? Contact the CSI team to find how our non-destructive testing services can help to ensure safe and effective operations of your assets.

Looking for a quote from our specialist team?

Get in touch today via our non-obligation estimate form below. We’ll be able to help you out with the information you need.

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Kurtis and his team showed highly skilled reading of scan results. These allowed them to be the only ones who successfully located the defects (random voids) in Polystyrene blocks filled with concrete and lined with Gib in a prepared area...

Maynard Marks

Engaging CSI to conduct the Pile Integrity Testing on the large 1.8m diameter piles was a wise choice. Their technicians were knowledgeable, approachable, punctual, health and safety conscious and flexible when we encountered late changes to the works programme. Results...

Fulton Hogan

As requested, the workers from CSI ltd contacted this office on arrival at the site and invited me (Kevin J Heays) to site visit and get an understanding of the intended works. I was impressed with the workers knowledge of...

Kevin Heays (ECANZ)

The CSI team were great and they did a good job for us. They were employed to complete QA on a Wellington Apartment Development using Pile Integrity Testing. We would recommend CSI to others in the future.

Richardson Drilling

CSI did a good job for us at an Auckland Apartment building; saving our team from drilling through services which would have caused considerable delays. We would recommend CSI to others for scanning

Allendale Electrical

CSI provided a great service. We could not advise them on areas of improvement as their service was highly professional.

Wilson Building

We found CSI via their website and were grateful that we had. Their service was highly professional.

Artisan Developments Ltd

CSI have completed several jobs for us. They are highly skilled operators.

Tracer Construction

CSI was recommended by a health board, and they did a great job for Q Interiors. We are already looking at employing them for future work.

Q Interiors

The service and follow-up of CSI Ltd was excellent. We would definitely use them again.

Grayburn Property Service

CSI Ltd did a great job for us. When we were asked what improvements could be made, we could think of no gaps in their professional service.

Trademark Building Services

CSI Ltd were recommended to us and did a great job. We would be happy to recommend them to others.

Stanley Construction

We were recommended CSI by an Engineer and he was absolutely correct; their GM particularly communicated well and was highly professional.

MSC Consulting Group

CSI has completed some exciting projects with Novare Design “I am very impressed at the responsiveness, relevance and accuracy of the testing and data supplied to Novare for some recent strengthening projects. We have worked with CSI on several projects...

Novare Design

Darren, Ali and the team at CSI have been a great help at the Oaks Shores refurbishment project. CSI was willing to work through the difficulties of travel under various Covid-19 levels, ensuring they could be of assistance in Queenstown...

Brosnan Construction