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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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What are we scanning? Slab on grade, suspended slab, etc.

What are we scanning for? Ex. rebar, tension cables, conduits, etc.

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What are we locating? Water, gas, electrical, sewer, etc.

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Honolulu Concrete Scanning Projects that Penhall Worked On

Stay on time and on budget before core drilling

concrete scanning electrical conduit Penhall Technologies scanned one location at a Waikiki hotel. The contractor needed to core drill a hole in the bottom of a planter for a new electrical conduit. Using the HR mini, our analyst marked out the rebar pattern and conduits on site. Thanks to this, the contractor avoided all structural reinforcements and conduits for the necessary core hole. He productively drill the hole in a timely manner.

Scan concrete for structural reinforcement

Penhall Technologies scanned four wall locations on a new condominium project.  The contractor needed to have four cores drilled in a new concrete wall. He wanted to scan to avoid all structural reinforcements and conduits for the necessary cores.  Our analyst inspected the concrete using the GSSI HR mini scanner. He marked out the rebar pattern and conduits on site, which allowed the driller to productively drill each hole in a safe, timely manner.

Scan concrete before core drilling and saw cutting

Penhall Technologies performed concrete scanning in a hotel renovation project in Waimea, HI.  The contractor needed to have cores drilled, concrete sawed, and trenches dug in various locations throughout the property.  It was essential to perform scanning and utility locating services to avoid all structural reinforcements and conduits. The analyst used the GSSI HR mini scanner and Electromagnetic Detection RD utility locator, to mark out the rebar pattern and conduits on site. This allowed the drillers and saw cutters to productively drill each hole and make each cut in a timely manner while avoiding embedded objects in the concrete walls and slabs.


Concrete scanning and core sampling for an aerospace and defense company in Haleiwa

concrete scanning for commercial satellite installationRecently, an aerospace and defense company hired Penhall Technologies to scan the base foundation walls of a commercial satellite installation in Haleiwa. They were planning to replace an existing dish with a new one and needed to know the integrity of the concrete base structure and needed multiple core samples. Using the GSSI Mini HR,our analyst marked the locations of all rebar and confirmed approximate depths. To make sure the core drilling didn’t impact any objects inside the facility, the analyst suggested using the Hilti trans pointer to give the customer exact locations of where the core drilling would penetrate inside the facility. The customer was very pleased as there was a large amount of equipment as well as electrical conduits mounted to the walls. Our Penhall Company core drillers were drilling immediately after the scans which saved the customer time and money.


Ground penetrating radar used to locate obstruction before core drilling

GPR Scanning to locate post tension cable before core drillingWhen Penhall was tasked to scan for another client in Honolulu, HI, we used ground penetrating radar in 6 different areas of the location. This was to ensure that it was safe to core drill 6″ holes into the 12″ thick concrete slab.

Finding rebar and identifying other hazards in suspended concrete slab

Finding rebar and identifying hazards with GPR concrete scanningAt yet another location in Honolulu, HI, ground penetrating radar was used to identify hazards within a 6″ suspended concrete slab. After scanning, the client was now safe to have an 8″ diameter core drill performed.