Cladding Fire Safety Survey

Following the Grenfell Tower tragedy, the landscape of building safety in the United Kingdom changed permanently. A cladding fire safety survey is now a fundamental requirement for the management of high-rise and multi-storey buildings. These technical assessments are designed to identify combustible materials, verify the presence of adequate fire-stopping, and ensure the entire external wall system meets current life-safety standards.

For building owners, managing agents, and developers, these surveys are not merely a box-ticking exercise. They are rigorous engineering investigations that determine the risk profile of a property and dictate the scope of any necessary remediation. Whether driven by the Building Safety Act 2022, Fire Safety (England) Regulations 2022, or lender requirements, a professional external wall fire survey provides the empirical data needed to make informed decisions about building safety.

Key Takeaways#

• Compliance and Legislation: A survey ensures alignment with the Building Safety Act and the latest UK fire safety regulations.
• System Analysis: It moves beyond the visible surface to inspect insulation, cavity barriers, and internal fixings.
• Risk Management: It categorises the level of risk, determining whether a building requires full replacement or targeted remediation.
• Asset Protection: Detailed reports are essential for securing insurance, mortgage lending, and property transactions.
• Professional Guidance: The process provides a clear roadmap from initial inspection to final certification and safety sign-off.

What is a Cladding Fire Safety Survey?#

A cladding fire safety survey is a comprehensive technical assessment of a building’s external wall system to determine its performance in a fire. Unlike a general visual inspection, this survey involves intrusive investigations—often referred to as 'opening up' works—to view the hidden components behind the cladding panels.

The primary objective is to verify if the materials used (such as ACM, HPL, or timber) are combustible and if the internal construction, particularly cavity barriers and fire-stopping, has been installed correctly to prevent the spread of flame and smoke.

• Material Identification: Laboratory testing of core samples to identify material classifications.
• System Integrity: Checking for vertical and horizontal cavity barriers.
• Compliance Assessment: Benchmarking the wall system against current building regulations and the EWS1 (External Wall System) criteria.
• Risk Grading: Providing a clear indication of whether the building is safe or requires intervention.

The Regulatory Framework in the UK#

In the UK, the regulatory environment for high-rise buildings (typically those over 18 metres or seven storeys) has become significantly more stringent. The Fire Safety Act 2021 clarified that the external walls of a building are within the scope of the Fire Safety Order. This means that "Responsible Persons" must account for the cladding and any attachments (like balconies) in their fire risk assessments.

The Building Safety Act 2022 further increased the burden of responsibility on developers and owners. It introduced the concept of the Accountable Person and established a new Building Safety Regulator. A cladding fire risk survey is often the first step in fulfilling the legal duty to demonstrate that a building's external wall system does not pose an unacceptable risk to life safety.

The Role of EWS1 Forms#

The EWS1 (External Wall System) process was created by RICS to assist in the valuation of high-rise domestic properties. While not a statutory requirement in the same way as building regulations, it is almost always demanded by lenders. A facade fire safety survey is the technical engine that drives the EWS1 result. The findings of the physical survey determine whether the building receives a 'low risk' A1/A2 rating or a 'high risk' B2 rating, the latter of which usually halts property sales until remediation is completed.

How a Cladding Fire Survey is Conducted#

A professional survey follows a structured, evidence-based methodology. It is not a desktop study; it requires physical access to the building’s envelope at various heights and orientations. At CladdingTesting.com, we emphasize that the quality of the data collected during the survey directly impacts the accuracy of the final safety report.

1. Initial Desktop Review#

Before arriving on site, surveyors review the 'as-built' drawings, operation and maintenance (O&M) manuals, and any previous fire strategy documents. While these documents provide a baseline, they are rarely sufficient on their own. Discrepancies between what was designed and what was actually built are common in the UK construction sector.

2. Intrusive Inspection and Sampling#

This is the core of the cladding fire survey. Surveyors use mobile elevated work platforms (MEWPs), mast climbers, or industrial rope access to reach various parts of the facade. They remove small sections of the cladding panels to inspect what lies behind them. Key areas of focus include:

• Insulation Materials: Checking if the insulation is non-combustible (e.g., mineral wool) or combustible (e.g., PIR/PUR foam).
• Cavity Barriers: Confirming if barriers are present around windows and at floor levels, and if they are installed to close the gap in the event of heat exposure.
• Fixing Details: Evaluating the structural integrity of the rails and brackets holding the cladding in place.
• Sample Collection: Taking small coupons of the cladding material for independent laboratory analysis (e.g., bomb calorimeter testing).

3. Laboratory Testing#

Samples are sent to accredited laboratories to determine their Euroclass fire rating. This ranges from A1 (non-combustible) to F (highly combustible). For many older buildings, the exact composition of the cladding is unknown until this stage, making laboratory verification a critical component of the cladding fire safety survey.

4. Technical Reporting and Risk Analysis#

The final stage is the compilation of a detailed report. This document collates the physical findings, the lab results, and the professional opinion of a fire engineer or qualified surveyor. The report identifies specific defects, calculates the overall fire risk, and recommends the next steps—ranging from 'no action required' to 'full cladding replacement'.

Common Defects Identified During Surveys#

Years of performing external wall fire surveys across the UK have highlighted recurring issues in both modern and legacy buildings. These defects often remain hidden for years until an intrusive survey is performed.

Combustible Core Materials#

The most publicised issue is the use of Aluminum Composite Material (ACM) with a polyethylene (PE) core. However, other materials like High-Pressure Laminate (HPL) and certain types of render systems with expanded polystyrene (EPS) insulation also pose significant risks. A cladding fire risk survey identifies these materials precisely so that owners aren't guessing about the safety of their assets.

Missing or Poorly Installed Cavity Barriers#

A cavity barrier’s job is to stop fire from "chimneying" up the space between the building structure and the cladding. We frequently find gaps in these barriers, barriers installed back-to-front, or barriers that are the wrong size for the cavity. In some cases, they are missing entirely. Even if the cladding panels themselves are fire-rated, a lack of fire-stopping can lead to rapid fire spread.

Incorrect Fixing and Substructures#

While fire safety is the primary concern, surveys also uncover structural issues. We look for corrosion in the galvanised steel or aluminium sub-frames and check that the fixings (screws, rivets, or adhesive) are sufficient for the wind loads of a high-rise environment. A failure in the fixing system can lead to panels falling from the building, creating a significant hazard to the public.

From Survey to Remediation: The Logic of Intervention#

At CladdingTesting.com, we do not believe that every failed survey must lead to a total recladding project. The goal is to find the most proportionate and effective solution. The findings of the cladding fire safety survey dictate which of the following paths is taken.

Option 1: Localised Repair#

If the survey reveals that the cladding panels are safe but the fire-stopping is defective in specific areas, a programme of cladding repairs may be sufficient. This might involve removing strips of cladding, installing the missing cavity barriers, and reinstating the original panels. This is significantly less disruptive and more cost-effective than a full replacement.

Option 2: Targeted Remediation#

In some cases, a building may have a mix of materials. For instance, the main elevations might be non-combustible, but decorative features or balconies may use combustible timber or HPL. Remediation involves replacing only the hazardous components while retaining the safe elements of the facade. This requires precise sequencing to ensure the building remains watertight and secure during the works.

Option 3: Full Cladding Replacement#

When the facade fire safety survey identifies systemic risks—such as ACM PE cladding or combustible insulation throughout—a full recladding programme is often the only compliant route. This involves the complete removal of the building envelope down to the structural substrate and the installation of a new, A1 or A2-rated system. This is a major construction project requiring expert logistics, especially in occupied residential blocks.

The Challenges of Surveying Occupied High-Rise Buildings#

Conducting a cladding fire safety survey on a 20-storey apartment block is vastly different from surveying a vacant warehouse. The logistical complexity is a major factor that building owners must consider.

• Resident Engagement: Clear communication with tenants and leaseholders is vital. They need to know why technicians are outside their windows and how long the intrusive works will take.
• Access Logistics: High-rise buildings often have limited ground space for machinery. We must coordinate with local councils for pavement closures or use specialist rope access teams where MEWPs cannot reach.
• Internal Interfaces: The survey must look at how the cladding interacts with internal fire compartments, including windows, doors, and balcony penetrations.
• Privacy and Security: Ensuring that intrusive works do not compromise the security of the residents' homes or cause undue distress.

Financial Considerations and Funding#

The cost of a cladding fire safety survey is an investment in risk mitigation. Without it, a building may be uninsurable or unsellable. In the UK, several funding streams have been established to help with the costs of remediation, such as the Building Safety Fund and the Cladding Safety Scheme.

To qualify for these funds, a building owner typically needs a robust external wall fire survey and a Fire Risk Appraisal of External Walls (FRAEW) conducted to the PAS 9980 standard. Our role at CladdingTesting.com is to provide the technical evidence required to support these funding applications, ensuring that the proposed remediation scope is accurate and justifiable.

Insurance and Liability#

Insurance premiums for buildings with combustible cladding have soared in recent years. Brokers and underwriters now demand high-quality cladding fire risk survey data before they will even offer a quote. By demonstrating a proactive approach to investigation and remediation, building owners can often negotiate better terms or at least secure the coverage necessary to remain compliant with their mortgage covenants.

PAS 9980: The Current Standard for Surveys#

The introduction of PAS 9980:2022 provided a new methodology for fire risk appraisals of external wall constructions. It moved the industry away from a simple "pass/fail" approach toward a more nuanced assessment of risk. A cladding fire safety survey conducted under PAS 9980 looks at:

1. The fire performance of the materials.
2. The facade configuration (e.g., presence of balconies, set-backs, or alcoves).
3. The fire strategy of the building (e.g., stay put vs. simultaneous evacuation).
4. The presence of fire-fighting facilities like risers and sprinklers.

This holistic view allows a competent fire engineer to decide if the cladding risk is "low," "medium," or "high." A medium risk might not require immediate replacement if other fire safety measures are enhanced, whereas a high risk will almost always trigger a recommendation for remediation.

Choosing the Right Specialist#

Not all surveyors are qualified to conduct a facade fire safety survey on a high-rise building. It requires a blend of structural engineering knowledge, fire science, and construction expertise. When selecting a partner for these works, building owners should look for:

• Demonstrable Experience: A track record of working on multi-storey residential and commercial buildings.
• Technical Competence: Professional memberships in bodies like the RICS, IFE (Institution of Fire Engineers), or CABE (Chartered Association of Building Engineers).
• Comprehensive Service: A provider who can handle the initial survey, coordinate lab testing, and then deliver the actual cladding repairs or replacement works.
• Independence: The survey should be an objective assessment of the building's condition, not a sales pitch for a specific cladding product.

The Impact of the Building Safety Act on Surveys#

The Building Safety Act 2022 has introduced a "Gatekeeper" system for new developments, but for existing buildings, it focuses on the "Golden Thread" of information. A cladding fire safety survey is often the primary source of data for a building’s Golden Thread. This digital record ensures that every subsequent owner or manager knows exactly what the walls are made of and how they were maintained.

Furthermore, the Act has extended the limitation period for claims under the Defective Premises Act 1972 to 30 years retrospectively. This means building owners may be able to use the evidence from a cladding fire risk survey to seek legal redress from the original developers or contractors who installed non-compliant systems.

Common Misconceptions About Cladding Surveys#

There is a lot of misinformation regarding external wall systems. One common myth is that "only ACM is dangerous." While ACM was the catalyst for change, many other systems—including certain timber claddings and high-pressure laminates—have failed external wall fire surveys due to their rate of flame spread.

Another misconception is that a survey always leads to a massive bill for recladding. In reality, a detailed cladding fire safety survey often finds that only specific parts of a building need attention, or that the risks can be managed through other fire safety improvements, saving owners millions of pounds in unnecessary construction costs.

Advanced Investigative Techniques#

While basic intrusive surveys involve hand-held tools and visual inspection, advanced technology is increasingly used to improve accuracy. Thermal imaging cameras can sometimes identify anomalies in insulation or moisture ingress that suggest defects in the wall system. Drone surveys can provide high-resolution imagery of hard-to-reach areas, though they cannot replace the need for physical, intrusive "opening up" of the facade.

At CladdingTesting.com, we utilise these technologies to supplement our physical inspections. By combining drone footage with traditional sampling, we can create a more complete picture of the building’s condition, ensuring that no defect is overlooked during the facade fire safety survey.

Maintenance and Long-Term Performance#

A cladding fire safety survey is also an opportunity to assess the general health of the facade. During our inspections, we often find blocked drainage paths, failed seals, and evidence of water ingress. While these might not be fire safety issues in the short term, they lead to the deterioration of the building fabric. Addressing these during a remediation project ensures the long-term structural integrity of the external wall system.

Summary of the Survey Process#

The journey from uncertainty to compliance follows a logical path. It starts with the recognition that a building needs to be assessed and ends with a clear strategy for safety. The table below outlines the typical workflow for a cladding fire safety survey.

Cladding Investigation Workflow

Phase

Key Activities

1. Preparation

Reviewing drawings, site access planning, resident notification, and risk assessments.

2. Investigation

Intrusive site work, removing panels, inspecting cavity barriers, and taking material samples.

3. Analysis

Laboratory testing of materials and fire engineering analysis of the wall system.

4. Reporting

Producing a technical report with PAS 9980 risk ratings and EWS1 certification if applicable.

5. Remediation Plan

Developing a scope for cladding repairs, remediation, or full replacement.

Why Prompt Action is Necessary#

Delaying a cladding fire safety survey can have serious consequences. Beyond the obvious risk to life, the commercial implications are significant. Buildings with unidentified or unmanaged cladding risks often face:

• Refusal of insurance cover or exorbitant premiums.
• Inability for leaseholders to remortgage or sell their flats.
• Enforcement notices from the Fire and Rescue Service or the Building Safety Regulator.
• Potential legal action from residents or regulatory bodies.

Taking the first step by commissioning an external wall fire survey allows a building owner to take control of the situation. It moves the conversation from fear and speculation to data-driven decision-making.

Frequently Asked Questions#

How long does a cladding fire safety survey take?#

The duration depends on the size and complexity of the building. For a typical mid-rise apartment block, the on-site intrusive work might take 2 to 4 days. However, the entire process—including laboratory testing and final report writing—usually takes 4 to 8 weeks. Highly complex structures or those requiring extensive rope access may take longer.

Who is responsible for paying for the survey?#

Generally, the "Responsible Person" or the "Accountable Person" (usually the freeholder, developer, or a Management Company) is responsible for commissioning the survey. Whether these costs can be passed on to leaseholders through service charges depends on the specific terms of the lease and the protections afforded by the Building Safety Act 2022.

Does a B2 EWS1 rating mean the building is evacuated?#

Not necessarily. A B2 rating means that the fire risk is high enough that remediation is required. It does not automatically mean the building is unsafe to occupy. In many cases, "interim measures" like a Waking Watch or an enhanced fire alarm system are put in place to manage the risk until the cladding fire safety survey recommendations can be implemented.

Can I get a survey for a building under 11 metres?#

Yes. While the most stringent regulations apply to buildings over 11m or 18m, fire safety is important for all structures. Lenders sometimes request an external wall fire survey for lower-rise buildings if they have specific concerns about the materials used, such as timber cladding or stacked balconies.

What happens if the original builder has gone bust?#

This is a common scenario. If the original developer is no longer in business, the responsibility for the cladding fire safety survey and subsequent remediation often falls to the current owner. However, government funds like the Building Safety Fund are specifically designed to help in these situations so that the cost does not fall entirely on the leaseholders.

Is a visual-only survey sufficient for compliance?#

Almost never. A visual survey cannot see the insulation type, the presence of cavity barriers, or the way the system is fixed to the structure. An intrusive cladding fire risk survey is required to provide the evidence needed for a professional fire safety sign-off. Visual inspections are only useful for identifying obvious damage like cracked panels or loose fixings.

What is the difference between A1 and A2 rated cladding?#

Both A1 and A2 are considered "non-combustible" in the context of UK building regulations. A1 materials (like stone or concrete) provide no contribution to fire. A2 materials (like some aluminium composite panels with mineral cores) provide a very limited contribution. Both are generally acceptable for use on high-rise buildings, provided the rest of the wall system is compliant.

Next Steps for Building Owners#

If you are responsible for a building and have concerns about the external wall system, the first step is to seek a professional assessment. A cladding fire safety survey is the only way to get a clear, legally defensible understanding of your building's safety profile.

At CladdingTesting.com, we provide the technical expertise to navigate this complex process. From the initial intrusive inspection to the delivery of major remediation programmes, our focus is on providing practical, solution-oriented advice. We help you understand exactly what is wrong, what the law requires, and how to fix it in the most efficient way possible.

Managing building safety is a significant responsibility, but it doesn't have to be overwhelming. With a structured approach to testing and a clear remediation strategy, even the most complex cladding problems can be resolved, ensuring the long-term safety of the building and its occupants.