Cladding Issues

Defining Cladding Issues#

The term "cladding issues" functions as a broad descriptor for defects, performance failures, or non-conformities identified within a building’s external wall system. In the context of the UK built environment, it refers to any condition where the building envelope deviates from its intended design, fails to meet prevailing regulatory requirements, or exhibits physical deterioration. While the term is often associated with fire safety in contemporary discourse, it technically encompasses a wide spectrum of concerns, including moisture ingress, structural instability, and material degradation.

In a professional capacity, the term is used to categorise findings during initial site surveys or detailed technical assessments. It provides a baseline for discussions between building owners, surveyors, and contractors before specific technical causes—such as poor workmanship, unsuitable material specifications, or systemic design flaws—are formally diagnosed.

Regulatory and Process Context#

In England and Wales, the identification of cladding issues is heavily framed by the Building Safety Act 2022 and the subsequent amendments to the Building Regulations. The regulatory focus is primarily on "relevant buildings"—typically those over 11 metres or five storeys—where the external wall system must be assessed for its contribution to external fire spread.

The process usually begins with a functional requirement to ensure the building envelope is adequate. Under the current regime, the discovery of cladding issues often necessitates an External Wall System (EWS1) assessment or a Fire Risk Appraisal of External Walls (FRAEW) conducted to the PAS 9980 standard. These processes do not simply look at the outer decorative panel but evaluate the entire assembly, including insulation, cavity barriers, and fixing methods. The regulatory context dictates that once an issue is identified, it must be assessed for its impact on the overall risk profile of the building, determining whether remediation or mitigation is required to meet the "functional requirements" of the Building Regulations.

Relation to Building Fabric and External Wall Systems#

Cladding issues are rarely limited to the visible surface of a building. The external wall system is a complex multi-layered assembly designed to provide thermal insulation, weatherproofing, and aesthetic finish. Issues typically arise at the interface of these different components. For example, a defect may not lie in the cladding panel itself but in the absence or incorrect installation of cavity barriers, which are essential for preventing the spread of fire and smoke through the voids behind the panels.

Structural issues may also manifest as cladding issues. This includes the failure of the sub-frame or rails that support the external rainscreen, or the use of incompatible fixings that lead to galvanic corrosion. Moisture-related issues, such as interstitial condensation or water ingress, can compromise the building fabric by causing rot in timber frames or reducing the thermal efficiency of insulation materials. Consequently, a holistic view of the building fabric is necessary to understand the root cause of any identified defect.

Technical Categories of Defects#

The industry generally categorises cladding issues into three primary areas: safety, performance, and durability. Each requires a different approach to testing and remediation.

The identification of an issue in one category often necessitates investigation into the others. For instance, removing panels to address water ingress may reveal previously hidden fire safety defects, such as missing fire stops around window apertures.

Roles and Responsibilities for Building Management#

For building owners, Freeholders, Residents’ Management Companies (RMC), and Right to Manage (RTM) directors, the term represents a significant management challenge. The identification of cladding issues triggers a series of legal and financial obligations. Under the Building Safety Act, "Accountable Persons" have a statutory duty to assess and manage building safety risks.

Understanding cladding issues requires a move away from visual inspections toward intrusive testing. Management entities must engage competent professionals to perform "opening up" works, where sections of the cladding are removed to inspect the underlying build-up. The resulting technical reports form the basis for any subsequent remediation strategy. It is also the responsibility of the management entity to ensure that any temporary mitigation measures—such as enhanced fire detection systems or changes to evacuation strategies—are implemented if the identified issues affect the life safety of the occupants.

Common Misunderstandings#

A frequent misunderstanding is the belief that cladding issues only pertain to Aluminium Composite Material (ACM). While ACM was the initial focus of industry-wide concern, the scope has expanded to include High-Pressure Laminate (HPL), certain types of render systems (ETICS), and even traditionally "non-combustible" materials like brickwork if the underlying cavity barriers or insulation are deficient.

Another misconception is that the presence of an "issue" automatically necessitates total cladding replacement. In many instances, "cladding issues" can be resolved through targeted repairs, the installation of missing cavity barriers, or the replacement of specific components rather than a wholesale strip-out. The severity and necessary response are determined by a risk-based assessment rather than the mere presence of a specific material. Furthermore, it is often assumed that if a building received Building Control sign-off at the time of construction, it cannot have cladding issues. In practice, contemporary standards and more rigorous inspection techniques often identify historical defects that were overlooked or deemed acceptable at the time of build.

Related Terminology and Technical Definitions#

The vocabulary surrounding the external building envelope is specific, and misusing terms can lead to confusion in technical reports.

• External Wall System (EWS): The entire assembly of components forming the outside of a building, including the inner leaf, insulation, vapour barriers, sub-frame, and outer cladding.
• PAS 9980: The code of practice for the fire risk appraisal of external wall construction and cladding of existing blocks of flats.
• Cavity Barrier: A piece of fire-stopping material that seals a void to prevent the spread of fire and smoke; a common site of cladding issues.
• Remediation: The act of fixing or replacing a defective system to bring it into compliance with current standards.
• Mitigation: Temporary or permanent measures taken to reduce the risk posed by a cladding issue without necessarily removing the defect itself.

Professional assessments will typically use these terms to provide a precise diagnostic of the "cladding issues" at hand, moving from the general symptom to the specific technical cause.