GPR Void & Sinkhole Detection Across BC
Find dangerous voids and wash-out cavities beneath slabs before they collapse
About This Service
Voids beneath slabs and driveways form when water leaks wash out sub-base material, leaving a hollow cavity the surface cannot support. GPR detects these voids before they become sinkholes or slab collapses — an especially common problem in BC's rain-intensive climate where underground leaks go undetected for years. We map void locations, estimate their extent and depth, and guide targeted grouting or repair.
How GPR Works for This Application
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The GPR antenna sweeps the slab surface in a grid.
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Voids appear as strong reflections from the air–soil interface below the slab.
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We distinguish voids from soil variations using signal characteristics.
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The void extent and estimated depth are mapped on the surface.
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Results guide targeted injection grouting or slab replacement to the affected area only.
Common Use Cases
What You Receive
- Mapped void locations on the slab
- Estimated void extent and depth
- Surface marking for repair crew
- Written report with GPR scan images
- Recommendation for grouting, underfill or replacement
GPR Void & Sinkhole Detection — BC Locations
Available across all of British Columbia.
GPR Scanning by BC City
Frequently asked questions
How do voids form under a slab?
Underground water leaks, broken drain lines and high groundwater all wash fine particles from the sub-base, leaving unsupported cavities that can cause cracking or sudden slab failure.
Can you scan through thick concrete?
Yes — GPR penetrates the concrete layer and images what is directly beneath it, distinguishing between solid sub-base and air-filled voids.
How do you repair a void once found?
Void filling is typically done by a structural contractor using pressure-injected flowable grout through small ports in the slab. We mark the locations precisely for that crew.
Book GPR Void & Sinkhole Detection
Non-destructive GPR scanning across British Columbia — Anyleak.ca since 1999.