GPR survey
Pre-cut and core scanning
Before a penetration goes through a slab or wall, GPR sweeps the proposed location in two directions and the returns are marked directly on the surface. The trade doing the cutting then positions holes to miss what the scan found, or relocates the penetration entirely.
Scope
What this covers
Two-directional GPR sweeps over each proposed penetration
Surface marking of bars, cables, conduits and anomalies in the scan zone
Depth estimates for detected targets where conditions allow
Clearance advice for repositioning holes around congested areas
A brief field record of what was marked and where
Timing
When it's needed
Any coring, sawing, drilling or anchoring into a suspended slab warrants a scan, and on post-tensioned structures it is effectively non-negotiable, since a tendon strike risks injury, structural damage and a very disruptive repair. Even slab-on-ground work benefits when in-slab conduits or pipes are plausible.
Treat every unidentified object in a slab as live and every unmarked area as unscanned. If a cut nicks a conduit or a tendon, stop work, keep people clear of the slab face and get the relevant specialist on site before anything else happens.
Quote variables
What shapes the scope
Number and size of the proposed penetrations
Slab thickness and congestion, which affect signal clarity
Surface condition: wet concrete and foil-backed insulation degrade radar returns
Access to both faces of the element, which improves confidence
Concrete scanning is an interpretive skill, not just a piece of equipment: ask any operator about their training, their experience on your slab type and how they express confidence in their marks. For excavation work, lodge a free enquiry with Before You Dig Australia and keep the plan responses on hand; field locating complements those plans rather than replacing them.
Scanning services
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