How Florida contractors use ground penetrating radar rental to detect rebar, post-tension cables, conduit, and buried utilities before cutting, coring, or excavating.
Call (239) 961-1799 to Rent GPR TodayEach project below is a real-world example of how a contractor rented GPR equipment, what they needed to find, which scanner they used, and what the outcome was. These are provided to help you understand what GPR rental can realistically accomplish before your next project in Florida.
A mechanical contractor needed to core through a 14-story residential high-rise slab to run new HVAC penetrations. The building used post-tensioned concrete construction throughout, meaning active PT cables ran in unknown locations inside each slab. Severing even one cable would require costly structural remediation and could halt the job entirely.
The crew rented a GSSI Flex 25 Antenna for 3 days with delivery. The Flex 25 operates at a 400 MHz center frequency and detects targets to 30-inch depth — sufficient for the 8-inch slabs in this building.
Scanning revealed PT cable bundling patterns running at roughly 12-inch intervals in the banded direction and loosely spaced in the unbanded direction. Rebar mat was confirmed at 1.5 inches below form line. The crew marked 22 approved core locations on two floors that avoided both rebar and PT cables with adequate clearance.
All 22 cores were completed without hitting a single post-tension cable. No delays, no structural damage claims, and no engineer callbacks. The rental cost the contractor $390/day — compared to an estimated $8,000 in remediation for one severed cable.
A general contractor excavating for a new commercial foundation in Tampa encountered conflicting utility as-built drawings. The drawings showed a gas line and a fiber run in the same general corridor, but the depths and exact horizontal positions did not match on-site landmarks. Standard 811 marks were present but not specific enough for a narrow, deep excavation.
The contractor rented both the US Radar Quantum Imager ($495/day) and the Radiodetection RD8000 ($250/day) to get both GPR and electromagnetic data over the same corridor. The Quantum Imager ran triple-frequency scans at 1000, 500, and 250 MHz in one pass. The RD8000 confirmed the metallic pipe and cable signatures independently.
GPR identified three subsurface targets: a gas pipe at 28 inches, a fiber conduit at 18 inches, and a previously unmarked metallic line at 42 inches depth. The RD8000 confirmed and locked in the two metallic targets. All three were located to within 6 inches horizontally.
Excavation proceeded safely around all three utilities. The unnamed metallic line turned out to be an abandoned water service that the municipality had no record of. Finding it before excavation prevented an unplanned water main break. Combined rental cost: $745 for the day. Estimated cost of a gas line strike in Florida: $50,000 or more in repairs, delays, and liability.
A structural steel sub in Orlando was tasked with installing over 300 hilti anchors in the top deck of a multi-level parking garage for a new facade support system. The deck had no structural drawings available on site, and rebar spacing was unknown. Drilling into rebar in a structural deck without clearance can compromise the anchor value and trigger engineering reviews.
The crew rented a GSSI StructureScan Mini XT for 4 days at $350/day. The 2700 MHz scanner provided clear rebar imagery to 24-inch depth and generated a grid map of 12 representative scan zones across the deck.
Rebar was confirmed running at 12-inch center spacing in both directions at approximately 2 inches below the slab surface. Top mat cover was 1.75 to 2.25 inches across the scanned deck areas. The crew identified a pattern of clear 4-inch windows between bars that consistently permitted anchor placement of the specified diameter.
All 300+ anchors were installed without rebar conflict. The scanning added 4 days of rental at $350/day ($1,400 total) but eliminated the engineer callback process for each conflict, which on a project this size would have consumed at least two additional weeks and thousands in delay costs.
A plumbing contractor needed to penetrate a shared transfer slab between two residential units in a Fort Lauderdale high-rise. The slab was heavily reinforced with both top and bottom rebar mats plus post-tension cables running in two directions. A standard 2D scan was not sufficient — the structural engineer requested 3D imaging data to confirm target depths and identify a safe window.
The project required the GSSI NC Concrete Scanner with 3-D rented at $550/day. The NC collects full-matrix data using a calibrated grid pattern and generates layered depth slices showing top mat rebar, PT cables, and bottom mat at distinct depth intervals.
3D imaging confirmed top mat rebar at 1.5 inches, PT cables at 4.5 to 5 inches in both banded and unbanded directions, and a bottom mat at 10.5 inches. A 3-inch diameter window was identified at the proposed penetration location that cleared all reinforcement by at least 0.75 inch around the circumference.
The structural engineer reviewed the 3D data set and approved the penetration location. The core was drilled without incident. Using the GSSI NC instead of standard 2D scanning provided the depth-slice data the engineer required and allowed the project to move forward without further investigative opening of the slab.
A civil contractor in Sarasota needed to trench 400 linear feet of road shoulder for a new drainage pipe. The corridor crossed an active utility zone with known gas, water, and power infrastructure, but as-builts were incomplete for the section. 811 marks covered part of the zone but flagging stopped 80 feet short of the full trench run.
The contractor rented the US Radar Quantum Imager for 2 days. The triple-frequency system allowed the operator to cover the full 400-foot corridor efficiently by capturing shallow and deep targets simultaneously without frequency changeouts.
Six distinct buried features were identified along the corridor: a gas main at 30 inches, a water service lateral at 22 inches, two electrical conduits at 18 and 36 inches, a telecom bank at 24 inches, and a previously undocumented storm drain at 48 inches. All targets were staked and photographed for the field crew before excavation began.
The trench alignment was shifted 14 inches horizontally in one section to maintain a safe clearance on the telecom bank. All other utilities were crossed safely at confirmed depths using hand excavation near each target. No strikes occurred. The two-day rental cost $990 including delivery.
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