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is to ensure the specification allows for protective coatings or aluminium alloys which are more resistant to corrosion. Even zinc requires an additional coating to ensure the weathering effect isn’t too damaging to the cladding.
This approach was put into practice at the Lady Bee Marina development, designed by architects ECE Architecture. The striking development comprises three quayside blocks, with elZinc cladding and roofing to add a unique aesthetic, and achieve performance needs.
Interestingly, zinc last year experienced a similar price hike which softened demand for the metal. This year, factors such as increasing stock levels due to low usage, has led to price falls and now demand is starting to grow once more.
Aluminium has seen the biggest shift, taking a huge leap forward in popularity, and it’s easy to understand why. Aluminium combines the benefits of being lightweight and easy to work with – making it ideal for efficient installations. For architects and specifiers, it’s available in a wide choice of colours and with unique surface patterns or effects which can easily match the needs of designers.
Our supply partnership with PREFA Aluminium has seen architects able to make excellent use of the material. Compared with metals that age over time, aluminium has a more immediate process to reach the final colouration. Aluminium cladding is available in 16 shades as standard, with bespoke colours available upon request. This flexibility, durability, and product cost have made it a highly sought after solution.
Battling the elements
While the enthusiasm for aluminium is great to see, we have issued a word of warning for architects who are utilising the metal in coastal projects. It’s easy to be caught out by the effects this environment can have on cladding. Galvanised steel is typically used where saltwater exposure, high humidity, wind, and temperature variations can affect corrosion. For those using aluminium, our advice
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Specified with the appropriate coatings, zinc was ideal for use on the coastal location, giving the material increased resistance to salt and other pollutants. The protective coating on the zinc reduces salt damage by providing a surface that allows the mineral to be washed off the surface of the metal. This was a huge benefit for the architect and client as it ensured the long-term appearance and performance of the cladding.
Minding the business So what should architects take into consideration for metals as we head to the end of 2023? First and foremost, it’s about looking at metal cladding and roofing with a commercial mindset. The choice of metal used will have a big impact on cost especially for large scale projects where order volumes will be high. If you’re using a metal which is currently priced higher or has limited availability, consider an alternative which might achieve the same effect over time. We’ve seen plenty of architects adapt their designs to use different materials yet still achieve the same desired outcome for the project. Consider your options and weigh up the benefits of switching to an alternative – such as aluminium for cladding – which will meet budget constraints without limiting design options. And as always, consider early
engagement with suppliers to help manage the stock and pricing of the products you’re proposing to use. Not only can this help ensure you keep designs within budget, it can also allow you to make any early design changes to the specification and still keep the original intent. Suppliers are best placed to advise on viability and, where appropriate, alternatives.
Simon Walker is category manager – hard metals at SIG Zinc and Copper
ADF OCTOBER 2023
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