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Solid Extruded Aluminium Cladding vs ACP and ACM: Specifying Non-Combustible Facades for High-Rise and Commercial Projects

The selection of external wall cladding on high-rise and commercial buildings in Australia is now primarily guided by strict compliance requirements under the National Construction Code (NCC). These regulations demand fire-resistant materials to ensure occupant safety and mitigate the risk of catastrophic fires. The heightened focus on fire safety arises from high-profile global and domestic incidents, such as the Lacrosse Building fire in Melbourne.

For architects and specifiers, the choice of cladding materials—particularly between solid extruded aluminium cladding and aluminium composite panels (ACP) or aluminium composite materials (ACM)—is critical. Each option has implications for compliance, fire safety, durability, and long-term performance. This comprehensive guide will dive into these materials, their properties, and the regulatory and practical considerations that determine their use in non-combustible facade applications.

What Is ACP and ACM? Material Composition and the Compliance Problem

ACP and ACM consist of two thin aluminium skins bonded to an internal core, and the fire performance of these materials is largely determined by the core’s composition. Traditionally, ACP panels relied on polyethylene (PE) cores, which are highly combustible and have been linked to several large-scale fire events worldwide.

In response to regulatory scrutiny, manufacturers introduced variations like fire-retardant (FR) cores, combining polyethylene with mineral fillers to reduce flammability. While these improve fire resistance compared to PE cores, FR cores remain combustible and do not fall under the NCC’s non-combustibility classifications. More advanced versions, such as mineral-filled cores (A2), offer better flame resistance; however, compliance still depends on rigorous product-specific testing and acceptance by a building certifier.

The National Construction Code (NCC) now restricts or outright bans ACP with PE cores for Type A and Type B buildings, which typically include high-rise, commercial, and multi-residential structures. 

Architects must refer to regulations and consult both fire engineers and certifiers to determine project compliance for ACP/ACM systems.

However, the restrictions on ACP have created a demand for materials like solid aluminium cladding, which meet Australia’s strict regulatory landscape while ensuring higher long-term reliability and safety.

What Is Solid Extruded Aluminium Cladding?

Solid extruded aluminium cladding is made from a single, homogenous aluminium substrate. As a non-composite material, it eliminates the risks associated with combustible cores, making it a standout option for non-combustible facades under NCC requirements. The production process involves forcing heated aluminium through an extrusion die, creating robust profiles or flat panels suited to architectural applications.

Aluminium itself is non-combustible, and solid panels ensure that no part of the cladding contributes to fire spread. Its uniform composition helps it comply with AS 1530.1 standards, a key benchmark for fire safety in external wall systems for Type A and B constructions.

Durability is an additional benefit. Solid aluminium resists delamination, UV damage, and environmental degradation, making it a particularly strong choice for projects in coastal areas or high-exposure environments. The material’s versatility also ensures compatibility with a wide variety of finishes—such as powder coating or timber-look films—and varied profile styles like interlocking panels or vertical battens, easily achieving complex or distinctive designs.

Alteria’s aluminium cladding systems are manufactured from solid aluminium and designed for commercial and multi-residential facade applications; product-specific technical documentation is available from the Alteria technical team.

Solid Aluminium vs ACP and ACM: A Specification Comparison

The decision between solid aluminium and ACP/ACM systems extends beyond fire performance, encompassing several critical specification dimensions such as material durability, long-term maintenance, design flexibility, and whole-of-life cost considerations. 

This comparison table provides a general reference for specifiers. Confirm your compliance requirements with the building certifier and contact Alteria for product-specific technical documentation.

Specification Attribute	Solid Extruded Aluminium	ACP and ACM (PE Core)
Material composition	Single solid aluminium substrate, no core	Two aluminium skins bonded to a combustible or fire-retardant core
Fire performance	Non-combustible substrate; does not contribute to fire spread	PE core is highly combustible; FR core has improved but not equivalent performance
NCC compliance (Type A and B)	Compatible with non-combustible cladding requirements; confirm with certifier	PE-core ACP generally not compliant for Type A and B buildings under current NCC
Durability	High; solid substrate resists delamination and long-term degradation	Risk of delamination over time, particularly in high-UV or coastal environments
Design flexibility	Wide range of profiles, finishes, and orientations available	Flat panel format; limited profile variation compared to extruded systems
Maintenance	Low; solid substrate does not delaminate or require core monitoring	Higher maintenance risk; PE-core products on existing buildings may require rectification
Long-term cost	Higher upfront cost; lower long-term risk and maintenance	Lower upfront cost; potential rectification or replacement liability on regulated buildings

NCC Requirements and the Cladding Compliance Landscape in Australia

All Type A and Type B constructions must meet specific fire performance standards prescribed by the NCC. These requirements primarily target non-combustibility for external walls and facade systems, aimed at reducing fire risks for buildings taller than three storeys, such as multi-residential projects and commercial high-rises.

However, regulatory compliance isn’t uniform across all states. Jurisdictions like Victoria and New South Wales have instituted additional requirements beyond the NCC, including state-level rules for buildings deemed high-risk due to their age or construction materials. As a result, architects and specifiers must work closely with certifiers and state authorities to confirm local compliance.

The demand for rectification of non-compliant cladding is now immense, with solid aluminium cladding emerging as a reliable and practical replacement for outdated ACP systems. Offering fire performance that meets regulatory standards, this material is embraced by both retrofit projects and new commercial builds.

When to Specify Solid Aluminium Cladding Over ACP and ACM

Specifiers should turn to solid aluminium cladding for projects that require:

• NCC Compliance: On Type A and Type B buildings, where non-combustibility is a key fire safety criterion.
• Cladding Rectification: For buildings needing replacement of banned PE-core ACP systems. Solid aluminium provides a durable, compliant alternative.
• High-Durability Applications: In coastal zones or areas exposed to constant UV radiation, where composite materials degrade faster.
• Cost Efficiency Over Time: Though initially pricier, solid aluminium’s low maintenance requirements significantly reduce long-term operating costs.

The material’s performance makes it indispensable for ambitious architectural facades where compliance, reliability, and design features converge.

Alteria’s solid aluminium cladding systems are available in a range of profiles and finishes suited to each of these project types, and you can contact Alteria’s technical team for project-specific specification support.

Explore Alteria Aluminium Cladding Systems

Engaging Your Cladding Supplier for Compliance-Driven Projects

For compliance and performance-driven projects, engaging a reliable supplier like Alteria ensures every facet of the cladding system aligns with project specifications. Architects and designers should expect their supplier to provide:

• Comprehensive Technical Documentation: Including material composition details and fire performance reports (such as AS 1530.1 compliance).
• Detailed System Drawings: For inclusion in specifications and construction plans.
• Quantity Estimation Support: Assisting with bidding and tender processes for accurate material take-offs.
• Expert Guidance: Tailored advice on material compatibility, integration with subframes, fire barriers, weather barrier systems, and other project-specific requirements.

Alteria provides extensive specification support across all these areas for commercial and high-rise projects. This includes access to detailed technical documentation, an intuitive [Spec Tool], and a dedicated technical team available for project-specific enquiries. 

It is important to remember that supplier-provided documentation supports, but does not replace, the independent advice of a qualified building certifier or fire engineer; both are essential for a compliant specification outcome in Australia.

Conclusion

The distinction between solid aluminium cladding and ACP/ACM systems is profound, with direct implications for NCC compliance and long-term project performance. Solid aluminium cladding’s non-combustibility, robustness, and design flexibility position it as the ideal material for Australia’s evolving construction and regulatory landscape.

Architects, specifiers, and façade designers are encouraged to engage Alteria’s professional team early to ensure compliant, sustainable, and aesthetically versatile solutions for their projects.

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Frequently Asked Questions

1. What is the difference between solid aluminium cladding and ACP?

Solid aluminium cladding is made from a single non-combustible aluminium substrate with no core materials, ensuring superior fire performance. In contrast, aluminium composite panel (ACP) consists of two thin aluminium skins bonded to a core, which can vary in combustibility. ACP with polyethylene (PE) cores is highly combustible and strictly restricted under current Australian building regulations, whereas solid aluminium is generally classified as non-combustible.

2. Is ACP cladding banned in Australia?

ACP with polyethylene (PE) cores is effectively banned on Type A and Type B buildings under the National Construction Code (NCC). Some ACPs with fire-retardant (FR) or mineral-filled cores are allowed in specific cases but require rigorous testing and compliance verification. Check with your building certifier and state authority to confirm project-specific restrictions.

3. Is solid aluminium cladding non-combustible?

Yes. Solid aluminium cladding does not contain a combustible core and is inherently non-combustible because aluminium does not ignite. This sets it apart from ACP and ACM systems. Always confirm a product’s non-combustibility classification via technical documentation and ensure compliance under AS 1530.1 with a certified expert.

4. Can solid aluminium cladding be used for cladding rectification?

Absolutely. Solid aluminium cladding is widely specified for replacing non-compliant ACP or ACM systems in cladding rectification projects. Its non-combustible substrate, along with an adaptable range of profiles and finishes, makes it a durable and practical choice for commercial and residential facades that need enhanced fire safety.

5. What documentation should I request from a solid aluminium cladding supplier?

Request the following from a solid aluminium cladding supplier for compliance:

• Technical product data sheets verifying material composition and non-combustibility.
• Fire performance reports (e.g., AS 1530.1 compliance).
• System drawings and fixing details for construction documentation.
• Material quantity estimates for tenders.

Review these documents with a fire engineer or certifier to ensure compliance with NCC requirements and state-specific regulations for your project.