Commitment to Safety • Reliable Results
Responsive Resources • Established Expertise

Penhall Technologies can help you locate rebar, pipes, post and pre tension cables, conduits and many other subsurface hazards that may be hidden in concrete. Our expertly trained analysts can also detect voids within or underneath concrete slabs. As a safety leader in the industry, contractors, engineers, and government agencies have come to trust Penhall first for safe and precise scanning services.

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Penhall Technologies Scanning Analyst Darren


  • 10 Years experience cutting and drilling for Penhall Co.
  • 2 Years experience as a GPR Analyst
  • 30 hr. OSHA Certified
  • Hilti PS1000 Structure Scan certified
  • RD7000 Radio detection certified
  • 7 years without a lost time accident
  • PowerSafe card for Southern Company Facilities

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Concrete Scanning on CMU wall to avoid obstructions

Scan to locate hazards in CMU wall
For a high school in Priceville, AL, Penhall was asked to come and perform concrete scanning on CMU wall.  This was done to ensure that there were no obstructions in the walls prior to hand sawing a 400’ x 2” opening.

Locating electrical wires within a concrete slab

Scan using GPR to detect electrical wires in concrete slab
At a location in Florence, AL, Penhall was asked to scan an area of about 10’ x 22’ to locate and mark any electrical wires that may be present within a concrete slab.  This was needed to ensure that the wires were avoided when cutting or drilling into the slab.

Finding rebar, post tension cable, and conduit using GPR

Scan and mark concrete slab for post tension cable
Penhall was asked to scan at a nursing home in Scottsboro, AL.  We used GPR and scanned two 2’ x 2’ areas of concrete slab to locate the post-tension cable, rebar, and conduit.

Radio detection followed by GPR scanning to ensure all obstructions are found

Scan to identify rebar pattern before core drilling
At a university campus in Alabama, Penhall performed a vast number of core drills (approximate 40 holes) ranging from 2” to 5” in diameter.   It was necessary for us to scan at least 14 locations to ensure that any hazards were avoided when drilling.