Wollongong · Planning guide
When to Scan Concrete Before Cutting
Scanning is a decision input, not a guarantee that a proposed cut is clear or structurally acceptable.
When scanning should be considered
When scanning should be considered
Scanning is particularly relevant where a cut or hole could intersect reinforcement, conduits, pipes, post-tensioning or other embedded features, or where the concrete build-up is uncertain.
The required confidence and method depend on the consequence of a missed feature, not only on the size of the cut.
What affects the result
What affects the result
Concrete depth, moisture, aggregate, reinforcement density, surface condition, access and scanner technology can affect resolution and interpretation. Closely spaced features may be difficult to distinguish.
The scanning scope should define the surveyed area, marked grid, proposed cut locations and required record.
Use more than one source of information
Use more than one source of information
Compare the scan with drawings, service records, visual evidence and site knowledge. For below-ground services, follow the appropriate service-location and excavation planning process.
Before You Dig Australia provides a national enquiry pathway for plans from participating asset owners, but plans and on-site locating have limitations and must be interpreted for the actual work.
Scanning is not engineering approval
Scanning is not engineering approval
A scanner may indicate steel or another feature; it does not decide whether reinforcement can be cut or whether a new opening is structurally acceptable. Escalate those decisions to the responsible engineer or project professional.
Scanning questions
Scanning questions
Can concrete scanning find every service?
No. Detection depends on material, depth, orientation, congestion, access and technology. Use scanning as one part of a broader checking process.
Should the proposed holes be marked before scanning?
Yes. Marked locations let the survey focus on the actual drilling paths and make the findings useful to the cutting provider.
Can the cutting provider move a hole around a detected feature?
Only within the design and trade tolerances approved by the responsible party. Avoid ad hoc relocation.
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