GPR Slab Scanning
Non-destructive investigation of reinforced concrete slabs using specialist Ground Penetrating Radar.
Rebar Detection
Identify reinforcement position, direction, approximate spacing and indicative depth within surveyed slab areas.
On-Site Mark-Up
Detected reinforcement and relevant survey responses can be marked directly onto accessible concrete surfaces.
Technical Reporting
Annotated photographs, processed GPR information, survey reports and CAD deliverables available where required.
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Need a concrete slab scan in London? Magnitude Geo provides professional GPR slab scanning for contractors, structural engineers, developers and construction professionals throughout London, the Home Counties and South East England.
Our surveys can investigate reinforcement and other detectable embedded features within accessible floor slabs, roof slabs and soffits before intrusive works commence.
Whether you require a targeted scan before drilling or coring, reinforcement investigation for a structural engineer or a wider slab assessment before refurbishment, we can develop an appropriate survey methodology.
Send us drawings, photographs and marked-up survey locations where available. Our team can review the information and provide a free, no-obligation quotation.
Why Scan a Concrete Slab?
Reinforced concrete slabs can contain multiple layers of reinforcement, post-tensioning, conduits and other embedded features that cannot be identified reliably from the visible surface alone.
GPR slab scanning allows selected areas to be investigated before drilling, coring, cutting or structural alteration works begin. Survey findings can then be considered by contractors, structural engineers and project teams when planning intrusive works.
Targeted scanning around proposed drilling and fixing locations.
Investigation around proposed penetrations before coring works commence.
Reinforcement investigation before forming openings through existing slabs.
Concrete investigation where existing structural information is limited or unavailable.
GPR Concrete Slab Scanning
Ground Penetrating Radar is a non-destructive investigation method used to collect information from within reinforced concrete slabs.
Radar signals are transmitted into the concrete and reflected responses are recorded for interpretation. Depending on the slab construction, survey conditions and required investigation depth, GPR can provide information regarding reinforcement position, direction, approximate spacing and indicative depth.
GPR can also respond to other embedded features and interfaces within concrete, making it useful for broader slab investigations where reinforcement is not the only concern.
Learn more about our GPR Survey London service.
Rebar Detection in Concrete Slabs
Reinforcing steel is one of the principal features investigated during concrete slab scanning.
Where reinforcement responses can be clearly identified, their positions can be marked directly onto the accessible concrete surface. This provides contractors and engineers with a practical reference to the reinforcement arrangement within the surveyed area.
More detailed surveys can investigate reinforcement direction, approximate spacing and indicative depth across selected areas of the slab.
Visit our Rebar Detection London service.
Slab Scanning Before Drilling & Coring
Drilling or coring through an existing reinforced concrete slab can affect reinforcement and other embedded features if the proposed work area has not first been investigated.
Magnitude Geo can undertake targeted GPR scanning around proposed drilling and core locations before intrusive works begin. Surveys can cover individual penetrations or larger areas containing multiple proposed drilling positions.
Where required, detected reinforcement and relevant survey responses can be marked onto the concrete surface so that findings can be reviewed against proposed working locations.
- Single drilling locations
- Core drilling positions
- Diamond drilling zones
- Mechanical and electrical penetrations
- Service routes
- Structural openings
Post-Tensioned Concrete Slab Investigations
Post-tensioned slabs require particular care before drilling, coring or cutting because tendons form an important part of the structural system.
Ground Penetrating Radar can assist with investigating detectable linear features within the proposed working area and can form part of a wider assessment where post-tensioning is known or suspected.
Where post-tensioned construction is known or suspected, this information should be provided before the survey so that the investigation can be planned around the proposed intrusive works.
Concrete Floor Slabs, Roof Slabs & Soffits
Magnitude Geo can undertake GPR slab scanning across a range of accessible reinforced concrete surfaces for construction, refurbishment and structural investigation projects.
Floor Slabs
Reinforcement investigation before drilling, coring, service penetrations and structural modifications.
Roof Slabs
Targeted reinforcement and concrete investigation where roof structures require alteration or new penetrations.
Concrete Soffits
Scanning from the underside where the upper surface of a concrete slab is inaccessible or occupied.
Structural Slabs
Representative reinforcement investigation for structural engineers assessing existing construction.
For more detailed reinforcement investigations, visit our Reinforcement Survey London page.
Concrete Soffit & Underside Slab Scanning
Where the upper surface of a concrete slab cannot be accessed, GPR scanning may be undertaken from the underside of the structure.
This approach can be particularly useful within basements, commercial buildings, car parks, gyms and refurbishment projects where the upper floor surface is occupied, covered or otherwise inaccessible.
When scanning from the underside, interpreted depth information is referenced from the soffit surface being scanned.
Survey grids and interpreted reinforcement positions can also be referenced or marked onto the accessible ceiling surface where required.
Slab Scanning for Structural Investigations
Structural engineers may require reinforcement information within an existing concrete slab before refurbishment, strengthening, change of use or other structural alterations.
Magnitude Geo can undertake representative GPR survey areas within selected parts of the slab to investigate reinforcement arrangement, direction, approximate spacing and indicative depth.
Survey locations can be selected around proposed openings, structural alterations, areas of increased loading or other locations relevant to the engineering assessment.
For wider structural investigations, visit our Reinforcement Survey London service.
Concrete Slab Scanning Survey Deliverables
Survey outputs can be tailored to the requirements of each project. Small targeted surveys may require physical site mark-ups, while larger structural investigations can require processed survey information and formal reporting.
Who Uses Our Concrete Slab Scanning Services?
Structural Engineers
Reinforcement information for structural assessments, proposed openings, alterations and existing slab investigations.
Diamond Drilling Contractors
Targeted slab scans around proposed core drilling and penetration locations.
Main Contractors
Concrete slab scanning during refurbishment, fit-out, construction and structural alteration projects.
Developers
Investigation of existing slabs where original reinforcement or construction information is unavailable.
Concrete Slab Scanning Across London
Magnitude Geo provides professional concrete slab scanning throughout Central London, North London, South London, East London and West London.
We support commercial buildings, residential developments, basements, offices, gyms, retail premises, industrial properties and existing reinforced concrete structures throughout Greater London.
Our survey coverage also extends across Surrey, Kent, Essex, Hertfordshire, Buckinghamshire, Berkshire and the wider South East.
Concrete Slab Scanning FAQs
What is concrete slab scanning?
Concrete slab scanning is a non-destructive investigation used to identify reinforcement and other detectable embedded features within an existing concrete slab.
Can GPR locate rebar in a concrete slab?
Yes. Ground Penetrating Radar can be used to investigate reinforcement position, direction and approximate spacing within reinforced concrete slabs.
Can you scan a slab before drilling?
Yes. Targeted GPR scanning can be undertaken around proposed drilling, fixing and penetration locations before intrusive works commence.
Can you scan before core drilling?
Yes. Slab scanning can be undertaken around proposed core and diamond drilling locations.
Can you scan the underside of a slab?
Yes. Where suitable access is available, scanning can be undertaken from the soffit or underside of a reinforced concrete slab.
Can GPR detect post-tensioning?
GPR can assist with investigating detectable embedded linear features within concrete where post-tensioning is known or suspected.
Can reinforcement be marked on site?
Yes. Where appropriate, detected reinforcement and relevant survey responses can be marked directly onto the accessible concrete surface.
Can you provide a slab scanning report?
Yes. Depending on project requirements, Magnitude Geo can provide annotated photographs, processed GPR outputs, reinforcement information and technical reports.
How much does concrete slab scanning cost?
The cost depends on the number and size of survey areas, access conditions, project location and the level of reporting required. Contact Magnitude Geo with drawings or photographs for a project-specific quotation.
Related Concrete Scanning Services
Explore our specialist concrete scanning and reinforcement investigation services across London and the South East.
GPR and concrete investigation services. GPR Survey London
Specialist Ground Penetrating Radar surveys. Rebar Detection London
Locate reinforcement within concrete. Reinforcement Surveys
Detailed reinforcement investigations. Ferroscan Surveys
Reinforcement detection and mapping.
