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RAAC surveys in Goff's Oak. The UK's reference point for RAAC.

RAAC Surveys Goff's Oak | Identification and Assessment | NDTScan

RAAC identification, condition assessment and reporting to IStructE guidance across Goff's Oak, Hertfordshire and the surrounding area. NDTScan attends from its Oxford base, anywhere in the UK.
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Cracked RAAC roof planks photographed during an NDTScan survey

Overview

NDTScan carries out RAAC surveys in Goff's Oak for schools, hospitals, councils, housing providers, universities and commercial owners. Reinforced autoclaved aerated concrete was used in roofs, floors and walls from the late 1950s to the mid 1990s, and a great deal of it is still in service across Hertfordshire. NDTScan is the UK's specialist in identifying it, assessing it and telling an owner plainly what to do next.

The Department for Education's list of education settings with confirmed RAAC, published in February 2024, includes 7 settings in Hertfordshire, among them Bushey and Oxhey Infant School, Churchfield Church of England Academy and Links Academy. Those are the buildings that made the published lists, which cover schools, colleges and NHS sites. They are named here as evidence that the construction is present in Hertfordshire, not as NDTScan projects. Around Goff's Oak the same roof and floor planks are in council buildings, housing, leisure centres, retail units and industrial sheds that nobody has counted.

NDTScan surveys RAAC in Goff's Oak in two stages that are usually completed on the same visit. First, identification: GPR and the plank's own signature, its width, its transverse reinforcement and its bearing detail, establish plank by plank whether the element is RAAC at all. Second, condition: each confirmed plank is inspected for cracking, deflection, bearing length, water ingress, corrosion and past repair, and the results are classified in line with IStructE guidance. The report says what was found, what was not found and how confident each reading is.

NDTScan's advice to Goff's Oak owners is consistent: survey before you decide. A RAAC roof that has been identified and assessed plank by plank can be managed, propped, strengthened or replaced on evidence. One that has only been glanced at will be closed, propped or replaced on fear, and that is where budgets go. The survey is the smallest cost in the chain.

Scan before you repair. That is the standing advice for every Goff's Oak client, and the reason NDTScan reports what the concrete contains before anyone specifies what to do about it.

Services Available in Goff's Oak

  • RAAC Identification Survey GPR based, plank by plank identification of reinforced autoclaved aerated concrete in roofs, floors and walls across Goff's Oak. Confirms what the element is made of without opening it up, and records plank widths, reinforcement and bearing details as evidence.
  • RAAC Condition Assessment Plank level inspection of confirmed RAAC for cracking, deflection, bearing length, water ingress, corrosion and previous repairs, classified in line with IStructE guidance. Reported so a Hertfordshire engineer or estates team can act on it directly.
  • RAAC Management and Reinspection Monitoring regimes, reinspection intervals and management plans for RAAC that is being kept in service, plus expert input where a Goff's Oak owner needs an independent second opinion on a survey or a remediation proposal.

RAAC in and around Goff's Oak

Typical Goff's Oak instructions: RAAC identification in schools, halls, clinics and council buildings built between 1955 and 1995; plank by plank condition assessment of confirmed RAAC roofs and floors; risk classification in line with IStructE guidance to support decisions on closure, propping or continued use; reinspection and monitoring of managed RAAC; and independent review of surveys and remediation proposals for Hertfordshire owners and their insurers. NDTScan covers Goff's Oak from Oxford in the same way it covers the rest of England.

NDTScan also provides RAAC surveys in Watford, Hemel Hempstead, Stevenage, St Albans, Welwyn Garden City and Cheshunt and the rest of Hertfordshire. The rest of the region is covered from the East of England RAAC surveys page, and the service itself is described on the RAAC surveys page.

About NDTScan

NDTScan is a specialist non-destructive testing company based in Oxford and led by Neil Smuts, author of The RAAC Book. It is the UK's specialist in the identification and analysis of reinforced autoclaved aerated concrete, and a Level 4 UKCSS Operator, the first in the UK to achieve that certification. RAAC surveys in Goff's Oak sit alongside the company's concrete scanning and structural condition survey work, and every report is written to a standard suitable for engineering acceptance, insurers and dispute work.

Goff's Oak RAAC Services

  • RAAC Identification GPR based, plank by plank identification of reinforced autoclaved aerated concrete in Goff's Oak roofs, floors and walls, without opening the structure.
  • Condition Assessment Cracking, deflection, bearing, water ingress, corrosion and previous repairs recorded for every confirmed plank in Goff's Oak buildings.
  • IStructE Classification Findings classified in line with IStructE guidance so Hertfordshire owners and engineers can decide on closure, propping, management or replacement.
  • Schools and Colleges Identification and assessment for education estates across Hertfordshire, planned around term dates and occupied buildings.
  • NHS, Council and Housing Estates Hospitals, clinics, council buildings, leisure centres and housing stock in and around Goff's Oak, with reporting that supports estate-wide decisions.
  • Nationwide from Oxford NDTScan attends Goff's Oak and the whole of England from its Oxford base, whenever the work demands it, with every survey interpreted and reported in full.
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Technical Support?

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Yes. RAAC identification and assessment is what NDTScan is known for, and Goff's Oak is inside its everyday UK coverage. The company attends from Oxford, surveys the building plank by plank and reports in a form the owner's engineer can act on.
That is the normal situation. Most RAAC in the UK was installed without the word appearing on a drawing, and many buildings have lost their drawings altogether. NDTScan identifies the construction directly, plank by plank, using ground penetrating radar and the plank's physical signature, so the Goff's Oak owner does not have to rely on records that were never kept.
Yes. NDTScan records each plank's condition and classifies the findings in line with IStructE guidance, which is what engineers, insurers and public bodies expect to see. For a Goff's Oak building that gives the owner a defensible basis for deciding on closure, propping, management or replacement.
No. Schools and hospitals are on the published lists because government asked for them to be surveyed. The same planks went into council buildings, housing, leisure centres, theatres, shops, offices and light industrial units across Hertfordshire, in Goff's Oak as much as anywhere. If a flat roof dates from 1955 to 1995 and its construction is unknown, it should be identified.
A plank by plank record: what each element is made of, its condition, its classification in line with IStructE guidance and photographs of every defect that matters, with a plain statement of what was found, what was not found and how confident each reading is. It is written for the Goff's Oak owner's engineer, estates team and insurer, and it stands up to scrutiny.
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Initial Scope Consultation

We start by understanding your asset, its environment, and your inspection goals. Whether it's structural integrity, corrosion mapping or defect detection, our team tailors a solution that fits.

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Using industry-leading equipment, including Trimble, Leica, DJI drones, and GPR systems, we perform detailed non-intrusive testing with minimal disruption.

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You receive comprehensive, plain-English reports backed by high-resolution imagery, 3D models, and annotated scan maps. Data is delivered fast, often within the same week.

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Beyond inspection, we guide your next steps, from remedial works to structural interventions or re-inspections. We’re partners, not just service providers.

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Our scanning systems are smart, secure, and fully compliant with UKAS, ISO 9712, and sector safety protocols. We bring the right tech to every job, no compromise.

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Every NDTScan technician is certified, trained, and experienced in real-world environments, from rail tunnels to marine piles. You're in expert hands.

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From urgent site visits to post-scan guidance, our team is on hand to support you, because clarity shouldn't wait until Monday.

Goff's Oak RAAC Survey FAQs

Frequently Asked Questions.

The questions Hertfordshire clients ask most often about RAAC surveys in Goff's Oak, answered by the UK's RAAC specialist.
Yes. RAAC identification and assessment is what NDTScan is known for, and Goff's Oak is inside its everyday UK coverage. The company attends from Oxford, surveys the building plank by plank and reports in a form the owner's engineer can act on.
That is the normal situation. Most RAAC in the UK was installed without the word appearing on a drawing, and many buildings have lost their drawings altogether. NDTScan identifies the construction directly, plank by plank, using ground penetrating radar and the plank's physical signature, so the Goff's Oak owner does not have to rely on records that were never kept.
Yes. NDTScan records each plank's condition and classifies the findings in line with IStructE guidance, which is what engineers, insurers and public bodies expect to see. For a Goff's Oak building that gives the owner a defensible basis for deciding on closure, propping, management or replacement.
No. Schools and hospitals are on the published lists because government asked for them to be surveyed. The same planks went into council buildings, housing, leisure centres, theatres, shops, offices and light industrial units across Hertfordshire, in Goff's Oak as much as anywhere. If a flat roof dates from 1955 to 1995 and its construction is unknown, it should be identified.
A plank by plank record: what each element is made of, its condition, its classification in line with IStructE guidance and photographs of every defect that matters, with a plain statement of what was found, what was not found and how confident each reading is. It is written for the Goff's Oak owner's engineer, estates team and insurer, and it stands up to scrutiny.