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Frequently asked questions

Why undertake concrete scanning?

There is often significant risk of hitting rebar, electrical conduits, pipes and cables during the cutting, coring or drilling process. The cost of such mistakes can be prohibitive, both in time and money, and can compromise the safety of employees undertaking the invasive works. Whenever you are planning to cut, core or drill any concrete structure, it is essential to inspect and assess the area prior to starting any work. 

Why use GPR?

Ground Penetrating Radar (GPR) is a widely used methodology for detecting reinforcing steel and services in concrete and other materials. It provides a high resolution image that accurately defines the location and depth of features of interest. At Southern Geophysical we have an expansive selection of advanced GPR systems which we use to solve the extensive range of problems our clients face. Our primary concrete scanning GPR systems can scan structures from 0 m to over 0.5 m in thickness, and we have a full range of geophysical systems for deeper imaging or more complex projects.

How long does scanning take?

Ground Penetrating Radar (GPR) is a very fast and efficient process, and generally a large area can be covered in a short amount of time. The exact amount of time needed to scan and mark out a concrete structure depends on the size of the survey area and the number of services or reinforcing steel present. As an example, we can generally clear a core hole location in a floor slab (0.5 m x 0.5 m total area) in 15 min. 

Why choose Southern Geophysical?

Southern Geophysical have been undertaking concrete scanning for over 15 years within Christchurch and across New Zealand. Our GPR operators are all tertiary qualified and undergo extensive training to ensure that the service we provide is professional, accurate and efficient. All of our operators have Site Safe passports and are qualified in First Aid. 

We respond promptly to service requests, especially when your need for concrete scanning is urgent. 

How much will it cost?

Our rates for concrete scanning start from $145 per hour (excluding GST) within Canterbury and $165 per hour (excluding GST) outside of Canterbury. If a report on the scanning or more detailed analysis of the data is required our rate for desktop work is $140 per hour (excluding GST). Mobilisation costs may apply for work outside of Christchurch. Complex jobs may incur higher rates if multiple GPR systems or operators are required, or if the site has restrictive access. 

We are happy to discuss your project requirements and try and work in with your budget.