Cladding Remediation: Rebuilding a Golden Thread

Here is a question every remediation team eventually gets, drawn as a composite rather than from one job. It arrives eleven months after the scaffold came down. The principal accountable person for the block is keeping a safety case report current, their consultant is working through it, and what they want to know is how the cavity barrier at the level seven slab edge was arranged on the north elevation, behind the new rainscreen. Your team stripped that elevation back to the substrate. Somebody stood on that scaffold and looked straight at it. The answer existed, in full daylight, for about four hours on a Tuesday.

What's Actually Being Asked

Remediation of an external wall is building work, and which regime it runs through depends on the building. Where the block is a higher-risk building, remediation sits inside the same building control regime as new higher-risk work, not outside it. Under the Building Safety Act, a higher-risk building in England is broadly one of at least 18 metres or seven storeys containing at least two residential units, and for building control purposes a hospital or care home meeting that height or storey test is in scope too. Building work on a building that meets that description generally needs building control approval from the Building Safety Regulator before it starts, with narrow exceptions for exempt work, work under a competent person scheme, and genuine emergency repairs. The regime does not stop at approval either: it governs how change is controlled during the work, and what is submitted at the end through the completion certificate application.

A great deal of cladding remediation happens on blocks below that threshold, where building control sits with the local authority or a registered building control approver rather than the regulator. The evidence problem in this post is the same on both. Only the route the paperwork takes is different.

Running alongside that, once a higher-risk building is occupied (hospitals and care homes are not carried over into this part of the regime), it has one or more accountable persons and a single principal accountable person, who prepares the safety case report for the building and has to produce it, and the information behind it, when the regulator asks. That is what the golden thread actually is. Not a document assembled at the end, but a duty to keep the information about the building accurate, digital, and available to whoever needs it next.

Put those together and remediation carries a problem new build does not. On new build the record starts empty and you fill it as you go. On remediation you inherit a record that is incomplete, out of date, or simply wrong about what is on the building, and you are expected to hand back something better than you were given. You are not maintaining a golden thread. You are rebuilding one, for a building somebody else built, from evidence that is visible for a few weeks and then covered up for decades.

That is the part worth sitting with. Strip-out is the only time anyone sees the original construction without paying for another scaffold and another opening-up. Questions about that build-up keep arriving for a long time afterwards, and the Building Safety Act reset limitation for claims under the Defective Premises Act 1972: thirty years where the right of action accrued before 28 June 2022, and fifteen years where it accrued on or after that date. Remediation being carried out now sits in the fifteen-year limb. Every one of those questions gets answered either from what your team recorded during those few weeks, or from scratch.

The Evidence That Answers It

A remediation package produces a specific and unusually perishable set of records. The ones that matter most are the ones that stop being obtainable the day the new panels go on.

• The as-found record. What opening-up and strip-out revealed: the original build-up, insulation, membranes, barriers, brackets and fixings, described and photographed against a fixed location. Elevation, level and grid reference, not "north side, near the corner".
• The appraisal basis. The fire risk appraisal of the external wall, where one set the scope of the works, and the assumptions it rested on. PAS 9980 is the published code of practice for the fire risk appraisal of external wall construction and cladding of existing blocks of flats; the revised 2026 edition was published in September 2026, and appraisals competently produced to PAS 9980:2022 remain valid. Where strip-out contradicts an assumption in the appraisal, that contradiction is itself evidence, and it belongs next to the appraisal rather than in somebody's inbox.
• Substrate and structural condition. The state of the backing wall and the slab edges as found, and the fixing pull-out results that decided what the new system could be anchored into, each recorded against the place it was taken.
• The tested configuration of the new system. Test evidence for the replacement system, the specimen it was actually tested on, and every departure from that specimen on this building, each carrying a dated technical justification.
• Cavity barrier and fire-stopping installation records. Installed by whom, checked by whom, signed before close-up. These are the records nobody can recreate afterwards without another scaffold and another opening-up, because the thing they describe is behind a finished façade.
• Competence, tied to the work. Who installed the barriers and the panels on that elevation, on that date, and what qualified them for it. Not the company training matrix: the people who were actually there.
• The decision record. Remediation runs on discovery, and discovery drives change. What changed, who approved it, what it was based on, and when.
• The handover record. All of the above in a form the accountable person can hold, search and pass on, rather than a folder of PDFs named after whoever saved them.

Why the Spreadsheet Version Fails

In my experience, remediation teams do record the strip-out. The problem is where it lands. The photographs are on four phones and in a WhatsApp group, taken by whoever was on the hoist that morning, with the location living in the photographer's memory and nowhere else. The pull-out results are a PDF attached to an email from a testing house, sitting in one inbox. The barrier sign-offs are paper sheets in the site cabin, scanned in batches when someone remembers. The deviations from the tested system are in a technical submittal thread that ran to dozens of emails and ended with "agreed, proceed". Every one of those records exists, and the tracker spreadsheet even says so. What none of them has is an anchor to a place on the building, which is the property that makes evidence answerable. Eleven months later the question is not whether a photograph of that slab edge was taken. It is which of many thousands of photographs is the level seven slab edge on the north elevation, and whether anybody left can still say so. Usually one person can, and they moved to another project in the spring.

Keeping It Provable

The fix is not more diligence from people who are already busy. It is moving where the record gets made. If the strip-out photograph is captured against the elevation, level and grid it belongs to at the moment it is taken; if the barrier inspection is signed off against that same location rather than just a date; if a deviation and its justification hang off the system and the bay they apply to, then the record builds itself while the scaffold is still up. That is the difference between a photo library and a record of a building.

It also solves the handover problem, which remediation contracts tend to underestimate. The accountable person does not want your files. They want to answer a question about a part of their building without commissioning a survey to do it. A record built as the work happens and anchored to the building rather than to the project is the version of handover most likely to still work after your team has gone, and it is the version that leaves the building with a golden thread it did not have when you arrived.

The Monday Checklist

1. Take one live remediation elevation and try to establish, from records alone, what the original build-up was at a named level. Time it, or note that the answer does not come at all.
2. Before the next strip-out starts, fix the minimum as-found capture: which locations, which features, who takes it, and what the location has to be recorded as.
3. Replace prose locations with a fixed reference (elevation, level, grid). In my experience, descriptive locations are the main reason a remediation photograph cannot be used later.
4. Pull every substrate and fixing pull-out result on live jobs into one register, with the location and date on each entry rather than in the covering email.
5. Check that cavity barrier and fire-stopping sign-offs are captured before close-up and can be retrieved by location, not only by inspection date.
6. List every departure from the new system's tested configuration on your current jobs, and confirm each one has a dated, signed justification rather than an email agreement.
7. Ask the accountable person or their representative now what form they need the handover in, and build to that from the first week instead of the last.

Where BrieXO Fits

The BrieXO bundle that covers this end of the work is FIELD, and it is live today: daily site records and ITP sign-offs, governed photo evidence, operative competence records, record-linked communication and programme visibility, captured as the work happens and anchored to the building, elevation, level and element they describe through the spatial spine BrieXO tenants run on, with approvals held in an append-only approval history and records that stay exportable. Linking test evidence to individual specification clauses sits with XO Spec in the DESIGN bundle and is on the roadmap rather than available today. None of it appraises a wall, and none of it decides whether a remediation scheme is adequate: those are judgements for the competent people making them. It supports, and does not certify, compliance. It supports your golden-thread and remediation evidence duties; it doesn't discharge them. The façade-specific picture is on our façade contractors page.

Related reading:the specialist contractor's guide to the golden thread, keeping façade test evidence findable, and whether a building is in scope at all.

George Sfica is a senior design manager at a specialist façade contractor, with 23 years in manufacturing and construction, eleven of them in façades and external envelopes, spanning fabrication, installation and design management, an MSc in Façade Engineering and an IFE Level 2 Certificate in Passive Fire Protection. He is the founder of BrieXO.