You need to core, anchor or saw through a slab without hitting a bar or a duct, or you want to know why a floor sags or a deck lets water through. The drawings are missing, or do not match what was built.
Typical depth and the antenna we bring. The ground decides the rest; we say so before quoting.
Reinforcement layout, slab thickness and safe coring zones.
Surface and structural layers, debonding, voids and wet zones in floors, decks and tunnel linings.
Deep or large targets start with a feasibility test: a short test section decides whether a full survey makes sense.
Each bar the radar line crosses returns an arch-shaped echo. A row of evenly repeated arches is the reinforcement layer; the continuous line above it is a layer interface in the floor. The shape of the arches gives the wave velocity in the concrete, and from it the depth of the bars.
Processed radargram, not migrated, so the hyperbolas stay visible.
A tight rebar mesh reflects most of the energy; what lies under it may stay hidden.
Depths assume a wave velocity in the concrete; a core or a known thickness calibrates it.
Two concretes cast against each other can give little contrast; such interfaces are reported as indicative.
Radar shows where to core or open up; it does not measure corrosion directly.
Client names, addresses and locations withheld.
Four zones on lines 0.3 m apart. For each block the report gave the structural layer thickness (block averages 26–35 cm, from 18 to 45 cm overall), the surface layer, moisture-risk areas beneath it and the risk of voids or debonding. A core through the 13 cm surface layer served as a check.
Transverse and longitudinal lines on an orthogonal grid over the deck. On the reference profile: two asphalt layers of 11.8 and 9.2 cm, a 10.3 cm cast-in-place slab, a 6.9 cm slab top and the 44.8 cm void of the hollow core. The readings pointed to frequent debonding between layers and one zone with no concrete cover over the rebar. Ten cores were taken for calibration; the interface between the cast-in-place concrete and the slab gave little contrast and was reported as indicative only.
Two basement levels scanned line by line. Slab about 17 cm thick, two rebar layers about 13 cm apart, bars mostly about 18 cm apart — but about 37 cm in part of the lower level. There the slab sagged locally, a wet zone showed beneath it, and a strong reflector at about 2.3 m pointed to the water table. Depths assumed a relative permittivity of 8, and the report says so.
| Site | Task | Antenna · data | Status |
|---|---|---|---|
| Building basement | Reinforced slab: rebar, voids and moisture, with a full report | Dual-frequency · ~100 lines at 0.3 m | Surveyed |
| Bridge | Deck on hollow-core slabs: layer thickness and voids, with cores taken for calibration | Orthogonal grid · transverse and longitudinal lines | Surveyed |
| Metro tunnel | Tunnel lining thickness and reinforcement | 600 MHz | Surveyed |
| Building | Rebar mapping in floor slabs | — | Surveyed |
| Building | Moisture assessment of masonry walls | — | Surveyed |
Status: Surveyed — carried out by us on site. Commissioned — ordered by the client, survey still to be carried out.
From €1,200 excl. VAT for a single zone; from €2,000 excl. VAT for a floor or a deck. Several zones and large structures are quoted per zone.
Every quote lists field time, processing, reporting and travel separately.
Tell us the site and the target. An engineer replies within one working day, with a fixed price or a question.
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Yes. We map the bars and ducts in the zone and show where coring avoids them.
Yes, where the underside of the slab gives a reflection. A core or a known thickness calibrates the depth.
Yes. Bridges and tunnels are surveyed as structures: layer thickness, reinforcement and voids, with cores for calibration where possible.
Not directly. It shows where reinforcement and moisture make a closer look worthwhile.
Pipes, cables, tanks, old foundations, voids and galleries, located before you dig.
Layer thickness, debonding, voids and subsidence under roads and paved areas.
Coarse roots around protected or valuable trees, mapped without digging.
Old foundations, wall lines, graves and buried structures, before excavation or restoration.