Aluminium Decking & Heat: Debunking the Summer Temperature Myth

It’s a question we hear every summer: Does aluminium decking get too hot to walk on in the sun? The short answer is no—aluminium decking doesn’t get any hotter than timber or composite, and in many cases, it cools more quickly. In this post, we address the common misconception about summer temperatures and balcony safety, especially for developers and housing associations choosing materials for multi-storey builds.

Yes, aluminium does absorb heat, as all materials do when exposed to the sun. However, what sets aluminium apart is its thermal conductivity—it heats up quickly but also releases that heat faster than timber or composite. As soon as the sun moves or the decking is shaded, aluminium begins to cool.

Independent tests comparing aluminium, timber, and composite boards show that surface temperatures are very similar across all three. For example, on a 30°C day, composite, timber, and aluminium all reach surface temperatures around 50–60°C, depending on colour and finish.

The key takeaway? Aluminium may feel slightly warm to the touch, but it’s no hotter than other common decking materials, and it remains stable and safe underfoot.

Balcony safety in summer isn’t just about heat—it’s about fire risk, slip resistance, and structural performance.

AliDeck’s aluminium decking is fully non-combustible, rated to Euroclass A2-s1,d0—meaning it won’t ignite, spread flames or drip molten material. This is essential for buildings over 11 metres, where combustible materials like timber or plastic composites are banned under building regulations.

With more outdoor activity in summer—from barbecues to smoking—non-combustible materials help reduce fire risk on balconies.

AliDeck decking is also powder-coated to Qualicoat Seaside Standard, providing slip resistance in both dry and wet conditions. The textured surface gives a secure footing even when barefoot. And thanks to its UV-resistant coating, our systems don’t crack, splinter, or degrade in sunlight—unlike timber or plastic-based boards.

Aluminium delivers the ideal balance of performance, safety and comfort in hot weather:

• No hotter than timber or composite
• Cools quickly when shaded or exposed to breeze
• Non-combustible—ideal for summer BBQs or smoking areas
• Slip-resistant and barefoot friendly
• UV and heat resistant with long-lasting powder coating and a 30 year warranty

These benefits make aluminium the reliable, future-proof choice for balcony systems across the UK and Ireland—especially as fire safety and weather durability become key concerns for developers and contractors.

We offer free samples of our aluminium decking so you can test the surface for heat and slip resistance. We also invite architects, contractors and housing associations to visit our factory for hands-on product experience and technical support.

Contact us today at info@alideck.co.uk or call 01622 534050 to arrange your free samples or speak to our technical team about summer-safe balcony decking.