GPR Scanning vs. Concrete X-Ray
Before cutting or coring concrete, you need to know what's inside it. Ground-penetrating radar (GPR) and X-ray are the two imaging options, and they differ sharply in safety, speed and access.
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Radar imaging of concrete from one side, in real time.
Strengths
- Single-sided access — no need to reach behind the slab
- Real-time results, no film processing
- No radiation, so work continues around it safely
Limitations
- Interpreting results requires a trained operator
- Very congested rebar can be challenging
Radiographic film image requiring access to both sides.
Strengths
- Very high detail in the right conditions
- Familiar to some structural specialists
Limitations
- Requires access to both sides of the element
- Radiation means clearing the area during exposure
- Slower — film must be processed
For the overwhelming majority of scanning before cutting or coring, GPR is the practical choice: single-sided, radiation-free and immediate. X-ray is reserved for the few situations that justify its access and safety constraints.
Frequently Asked
GPR is safer for occupied buildings because it uses radar, not ionizing radiation, so surrounding work doesn't need to stop and no area needs to be cleared. X-ray requires evacuating the exposure zone.
GPR needs access to only one side of the slab or wall, produces results instantly, and is radiation-free — making it faster and more practical than X-ray for locating rebar, post-tension cables and conduit before cutting.
More Comparisons
Not sure which approach your situation needs?
A professional doesn't pick a tool in advance — they choose the right method once they understand your property and symptoms. Leaks.ca is the educational division — for booking and on-site detection across British Columbia, our service partner Leak.ca handles professional assessments.
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