What is the difference between aluminum composite panels and solid metal walls for exterior façades?

Aluminum composite panels (ACPs) and solid metal walls (single-skin metal façades or full-metal panels) are both popular for modern exteriors, but they differ in structure, performance, maintenance, and application. ACPs are sandwich panels consisting of two thin metal face sheets (commonly aluminum) bonded to a low-density core (polyethylene or mineral-filled core). ACPs are prized for their lightweight nature, flatness, wide range of colors and finishes, and ease of forming into complex shapes — making them ideal for expressive façades in Doha, Dubai, and Astana. They typically provide good aesthetics, quick installation, and cost-efficiency for large curtain-wall cladding. However, core material and fire performance must be carefully specified: mineral-filled or fire-retardant cores are recommended for high-rise or public buildings to meet regional fire codes. Solid metal walls — which might be full-thickness aluminum panels, architectural steel cladding, or corrugated/standing-seam metal — offer monolithic metal mass and structural robustness. They can be thicker and more impact-resistant, easier to repair in sections, and exhibit predictable thermal expansion behaviors. Solid metal systems often perform better where mechanical durability, high wind loads (e.g., Gulf sandstorms), or long service life are priorities. From a thermal standpoint, neither system alone provides insulation; both are typically paired with insulation, rainscreen cavities, or insulated panels. Selection between ACP and solid metal walls should weigh aesthetics, fire code, wind and sand resistance, maintenance plans, and local preferences across Middle East and Central Asian project sites.