Cladding Removal

Key Takeaways#

• Cladding removal is the systematic process of stripping external wall systems that are either unsafe, deteriorated, or no longer compliant with UK building regulations.
• Safety is the primary driver, particularly regarding the removal of unsafe cladding like ACM (Aluminium Composite Material) or HPL (High-Pressure Laminate) on high-rise buildings.
• Projects range from localized decladding for repairs to full-scale strip and reclad programmes involving insulation and cavity barrier upgrades.
• Current UK data suggests that while over 90% of identified high-rise residential buildings have seen 1 tower has had cladding removed and replaced in many clusters, hundreds of buildings still require remediation.
• The process requires meticulous planning, including cladding removal services that account for resident safety, structural integrity, and environmental waste management.

Cladding removal is the managed extraction of external building panels and associated sub-structures from a property’s façade. This process is typically initiated when a building’s external wall system is found to be non-compliant with fire safety standards, structurally unsound, or suffering from severe moisture ingress.

In the United Kingdom, the demand for cladding removal services has increased significantly following legislative changes, such as the Building Safety Act 2022. Building owners and managing agents must now ensure that external walls do not pose an undue risk to life, leading to widespread decladding and remediation across the high-rise sector.

The Essential Guide to Decladding and Remediation#

Understanding decladding meaning is the first step for any property professional tasked with managing a façade project. In a technical context, it refers to the controlled stripping of the outer leaf of a building, which may include the panels, the rails, and the insulation layers behind them.

The goal of cladding removal is rarely just about taking panels down; it is about preparing the building for a compliant replacement system. This often involves a strip and reclad approach where the entire external wall assembly is modernised to meet current A1 or A2-s1, d0 fire ratings.

Why is Cladding Removal Necessary?#

• Fire Safety Compliance: The most common reason is the removal of unsafe cladding that fails to meet combustibility standards set out in Approved Document B.
• Structural Failure: Over time, fixings can corrode or panels can delaminate, making the façade a falling hazard.
• Moisture and Damp: If water penetrates the cladding, it can rot the primary structure or render insulation useless, necessitating a full strip-back.
• End of Lifecycle: Many systems installed in the late 20th century have reached the end of their design life and require cladding removal contractors to overhaul the envelope.

At CladdingTesting.com, we emphasise that removal should always be preceded by a thorough investigation. Jumping straight to removal without understanding the underlying wall buildup can lead to unnecessary costs and logistical errors.

How Many High-Rise Buildings Have Cladding Removed?#

A frequent question from stakeholders is: how many high-rise buildings have cladding removed across the UK? According to data from the Department for Levelling Up, Housing and Communities (DLUHC), the numbers are constantly shifting as new defects are identified.

As of recent reports, several thousand buildings over 11 metres have been identified as having potentially life-safety fire risks. In the high-rise category (over 18 metres), the majority of buildings with ACM cladding have either completed remediation or are currently under cladding removal services.

However, the scope has widened to include buildings between 11 and 18 metres. This means that while 1 tower has had cladding removed and replaced in one specific development, there may be three others next to it just beginning the procurement process for cladding removal contractors.

The Technical Process: How to Remove External Cladding#

To remove external cladding from a high-rise structure is a complex engineering task. It is not merely a demolition job; it is a surgical extraction that must protect the building’s occupants and its structural core.

Phase 1: Survey and Risk Assessment#

Before a single panel is unscrewed, a detailed façade survey is required. This establishes how the panels are fixed—whether by rivets, secret-fix systems, or cassettes. We also assess the condition of the substrate, which could be concrete, steel frame, or masonry.

Phase 2: Access and Logistics#

Choosing the right access method is critical. For many cladding removal projects, mast climbers are preferred over traditional scaffolding as they offer better floor-by-floor access and are often faster to deploy on tall buildings.

Phase 3: The Removal Sequence#

1. Top-Down Approach: Generally, removal starts at the top of the building to prevent debris from falling onto lower work areas.
2. Component Separation: Panels are removed first, followed by the secondary support grid (rails and brackets).
3. Insulation Extraction: Combustible insulation (such as PIR or phenolic foam) must be carefully bagged and disposed of according to hazardous waste regulations.
4. Substrate Preparation: Once the wall is stripped, the structural face is cleaned and inspected for damage.

It is vital that cladding removal contractors ensure the building remains weather-tight during this process. A building without its "skin" is vulnerable to the British weather, so temporary fire-rated membranes are often applied.

Identifying Unsafe Materials for Removal#

The removal of unsafe cladding focuses on specific materials that have been proven to facilitate rapid fire spread. Identifying these requires laboratory testing and professional onsite inspection.

ACM (Aluminium Composite Material)#

These panels consist of two thin aluminium sheets bonded to a core. If that core is polyethylene (PE), it is highly flammable. Total cladding removal is almost always mandated for PE-cored ACM on high-rise buildings.

HPL (High-Pressure Laminate)#

Often used for its aesthetic wood-grain finish, HPL is made of wood fibres and resins. Depending on its fire classification and the insulation behind it, HPL often requires decladding to ensure safety.

MCM (Metal Composite Material)#

Similar to ACM, these can have cores made of zinc, copper, or stainless steel. The combustibility of the core remains the deciding factor for whether cladding removal services are necessary.

If you are unsure about the materials on your building, Cladding Testing provides the necessary diagnostic services to determine if your façade requires intervention.

The Challenges of Removing Cladding in Occupied Buildings#

One of the most difficult aspects of cladding removal is performing the work while residents remain in their homes. This introduces significant health and safety challenges and requires a sympathetic approach to project management.

Noise and Vibration Control#

Drilling out rivets and removing metal rails generates significant noise. Professional cladding removal contractors work within strict "noisy hours" to minimise the impact on residents, especially those working from home.

Privacy and Light#

Scaffolding and debris netting can make apartments feel dark and claustrophobic. Using transparent netting where possible and maintaining clear communication about how long specific elevations will be obscured is essential for resident relations.

Fire Safety During Works#

When you remove external cladding, you may temporarily expose the building's internal compartments or remove fire-stopping measures. A robust interim fire safety strategy, which may include a "Waking Watch" or enhanced detection systems, must be in place throughout the decladding phase.

Strip and Reclad: A Long-Term Investment#

For many building owners, the phrase strip and reclad represents a significant financial burden. However, it should also be viewed as an opportunity to improve the asset's value and performance.

A full strip and reclad allows for the installation of high-performance mineral wool insulation, which improves the thermal efficiency of the building. This can lead to lower energy bills for residents and a reduced carbon footprint for the property.

Furthermore, replacing outdated systems with modern, non-combustible materials like solid aluminium or fibre cement panels ensures the building remains mortgageable and insurable, protecting the long-term interests of leaseholders.