Post-Tension Cables
Identify likely post-tension tendon positions where detectable before drilling. Striking a tendon is one of the most expensive avoidable incidents on a PT slab.
Post tension cable detection from Corvus is part of our gpr concrete scanning service. A struck post-tension cable is among the most expensive avoidable incidents on a slab. We work to identify likely PT tendon positions where detectable and mark them before any penetration, using calibrated GPR equipment with surveyors experienced in PT investigation. Detection is subject to slab geometry, depth, reinforcement density and other site conditions; results are indicative and should be reviewed by a qualified engineer before drilling.
Built around the question being asked.
A surveyor passes a high-frequency antenna over the surface in a grid pattern. The antenna emits short electromagnetic pulses. Anything with a different dielectric to the host concrete — steel, water, voids, plastic conduit — reflects part of the signal back. Software builds a depth-indicative map of detectable reflectors and likely target positions within the scanned area. Targets are then marked up on the slab itself and supplied as a digital deliverable.
For post-tension cables specifically, the brief drives the choice of frequency, density, and reporting style. We quote a method that fits your access window, your accuracy requirement, and the downstream use of the data.
What you get
- On-slab marker plan in survey paint or chalk
- Annotated PDF report with depths and locations
- Digital DXF / DWG plan compatible with your CAD software
- Photographs of marked-up areas
- Surveyor sign-off and method statement
Calibrated. Qualified. Defensible.
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Calibrated kit checked at the start of every session, with the calibration record supplied in the project pack.
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Surveyors qualified for the method, signed off on the report by the person who did the work — no anonymous deliverables.
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Reporting written for the engineer or contractor who has to act on it, not for the file.
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Same-day quotations and a date in the diary. UK-wide coverage. No minimums on small jobs.
Ready to see what's beneath the surface?
Tell us what you're working on. We'll come back within a working day with a quote, a method, and a date in the diary.