Worldwide, including in Australia, architects and builders often choose aluminium for specialized applications. There are two types of aluminium material to choose from but they differ in price. One type is solid aluminium (sometimes called solid alu), and another type is aluminium composite sheets (sometimes referred to as alco or alucobond). Architects then have to explain to building owners why a specific type is preferred. This article can help owners understand the differences between the two types more easily.
The two types
Aluminium composite panels
To describe the construction of aluminium composite panels (ACPs) they are sometimes compared to a sandwich because they are composed of a polyethylene or mineral core between two thin aluminium sheets. As they are strong and lightweight, they are ideal for construction. Because of their characteristics, architects and builders use the material indoors and outdoors for aluminium cladding installations.
Solid aluminium
Solid alu consists of only one alu sheet, available in various thicknesses. Although it has a light density, it is rather difficult to work with compared to other materials, including alco panel sheets. It has anti-corrosive properties and its strength can be enhanced by welding sections together. Solid alu is totally non-combustible and therefore provides a very high level of fire resistance. The material is fully recyclable.
Similarities
Before we look at the differences, let us outline three similarities.
- When compared to other metals, both solid alu and aluminium composite sheets have an excellent strength-to-weight ratio.
- Both types can be rolled and shaped to fit various types of jobs, and both types are available in various colours.
- Both the composite material, including alucobond, and solid alu have high-quality finishes and are eco-friendly, recyclable and reusable.
Differences
- Aluminium ACP sheets are lighter than solid alu sheets and therefore need less effort to install than solid aluminium.
- Solid aluminium is more corrosion-resistant than aluminium ACP sheets, and thus, more suitable for structures in areas with extreme weather conditions.
- ACP panels are especially popular for cladding purposes because they always keep their shape, even in extreme temperatures. They can stay flat and without wrinkles for years after installation. Cladding done with solid alu, however, may start to wrinkle a year or so after installation.
- Solid alu sheets are impact resistant and can withstand extreme storms, while alco cladding has a lower level of impact resistance and dent more easily than solid alu sheets.
- If not very carefully fitted, alucobond panels may leak when it rains. Solid alu can be welded to seal the places where water may get in.
Conclusion
Architects and builders use both types of aluminium sheets in their building structures, especially for cladding purposes. Because there are many similarities between the two types there are instances where either of the two types can be used. However, the differences often make one type more efficient than the other in specific circumstances.
