PT slab survey
Post-tension cable location
Post-tensioned slabs carry steel tendons stressed to enormous loads inside plastic or metal ducts, and they rarely run exactly where the drawings say. GPR traces the actual tendon paths across the work area so every planned penetration keeps a safe margin from every cable.
Scope
What this covers
Tendon path tracing and marking across the affected bays
Cross-referencing against structural drawings where the builder can supply them
Offset marking so trades see the exclusion zone, not just the cable line
Escalation advice when a required penetration cannot achieve clearance
Timing
When it's needed
Fit-outs in post-tensioned commercial buildings generate constant demand: new risers, plumbing penetrations, anchor fixings for services and equipment. Residential apartment towers built since the 1990s are commonly post-tensioned too, which surprises owners planning renovations.
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
Duct type: metal ducts return strongly, plastic ducts need more careful interpretation
Tendon depth variation across the span profile
Congestion where tendons, rebar and conduits share the same zone
Whether drawings exist to cross-check against
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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