Slab Thickness & Void Detection in Cranbrook, BC

Often, yes — a drummy slab is the classic early sinkhole symptom. GPR confirms in minutes whether there is a cavity, how big it is, and how thin the remaining slab bridge is. That last number decides whether the area gets barricaded today or scheduled for repair next month.

The usual suspects: leaking water or sewer lines washing out fines, poorly compacted fill settling, buried organics decomposing, and in older Vancouver Island areas, karst dissolution in limestone. Identifying which one drives the repair approach.

Yes — GPR thickness verification is the non-destructive alternative to coring. Continuous profiles across the pour show exactly where thickness meets or misses the structural drawing, with ±5 mm accuracy.

Depends on span and bridge thickness, which the scan quantifies. A 30 cm void under a 150 mm slab is monitoring territory; a 2 m void under 80 mm of bridging concrete is a barricade-now finding. The report states which case you have.

Cranbrook sits on dry Rocky Mountain Trench gravels and sands. Dry trench gravels give Okanagan-class penetration — deep, clean returns across most of the city. We select antenna frequency to match — and where local ground limits radar depth, we pair GPR with electromagnetic locating, acoustic methods, or tracer gas so the survey objective is met regardless of soil conditions.

Cranbrook is part of our standing East Kootenay service area — the same certified technicians and equipment that cover the rest of the region. Scheduling is typically within 24–72 hours, with same-day response often possible during business hours (Mon–Sat, 8am–6pm Pacific).

Pricing matches our province-wide structure — no regional premium for Cranbrook. Most residential-scale work falls in the $350–$1,200 range depending on scope; commercial and multi-site projects are quoted after a free phone consult. Call 604-239-9934 and we will give you a tight estimate in five minutes.