Composite cladding

Composite cladding refers to a type of external building covering made from a combination of materials, typically designed to provide thermal insulation, weather protection, and aesthetic enhancement. Commonly, composite cladding panels consist of two thin, durable outer layers (e.g., metal, wood veneer, or laminate) bonded to a lightweight core (e.g., plastic, insulation material, or mineral-filled layers). This combination offers a balance of strength, lightweight properties, and insulation.

Types of composite cladding include:

• Aluminium Composite Panels (ACP) or Aluminium Composite Material (ACM). Comprised of two aluminium sheets bonded to a core material (e.g., polyethylene or fire-resistant mineral core). Widely used due to their lightweight, durability, and aesthetic versatility. For more information see: ACM cladding.
• Wood-Plastic Composite (WPC) Cladding. Made from a blend of wood fibers and recycled plastic. Offers a natural wood look with increased durability and low maintenance.
• High-Pressure Laminate (HPL) Cladding. Composed of multiple layers of kraft paper impregnated with phenolic resin, with a decorative laminate layer. Offers high durability, impact resistance, and weather resistance. For more information see: HPL cladding.
• Fibre Cement Composite Cladding. Made from cement, sand, and cellulose fibers. Combines the aesthetic of wood with the durability of concrete.
• Metal Composite Cladding. Includes combinations of metals such as zinc, copper, or stainless steel bonded to cores. Known for its modern aesthetic and structural strength.
• Stone Composite Cladding. Combines natural stone (e.g., granite or marble) with lightweight backing materials such as aluminum or resin. Offers the appearance of stone with reduced weight and easier installation.
• Glass Reinforced Concrete (GRC) Panels. Composed of concrete reinforced with glass fibers. Lightweight, durable, and fire-resistant, commonly used in façade systems.

The Grenfell Tower fire in June 2017 had a significant and transformative impact on the use, regulation, and perception of composite cladding in the UK. The UK government banned the use of combustible cladding materials, such as certain types of Aluminium Composite Material (ACM) with a polyethylene core, in buildings over 18 meters high. Stricter building safety regulations were introduced to ensure fire safety, including mandatory use of fire-resistant cladding and improved fire testing standards.

Thousands of buildings were found to have unsafe cladding, leading to large-scale remediation projects to replace non-compliant materials. Significant financial and logistical challenges arose, with government funds allocated to help rectify unsafe cladding, but many building owners and leaseholders faced high costs and delays.

The emphasis shifted to ensuring overall fire safety in buildings, including evacuation strategies, sprinkler systems, and fire door compliance. The disaster led to heightened scrutiny of construction materials and methods. Residents and stakeholders demanded greater transparency and accountability regarding building safety.

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