Does Aluminium Decking Get Hot? A Comprehensive Guide

When considering outdoor decking materials for your garden, balcony, or terrace, heat retention is an important factor—especially in sunny climates or if you have pets and children. This article examines how aluminium decking performs in hot weather compared to other materials, with a focus on ARP’s premium A-rated aluminium products. 

How Different Decking Materials Respond to Heat

Scientific testing reveals significant differences in how decking materials perform when exposed to sunlight. In a comparative study conducted on one of the UK’s hottest days, three common decking materials—aluminium, timber, and composite —were tested for their heat absorption and dissipation properties when exposed to direct sunlight for three hours. 

Table that displays the difference in heat testing between aluminium decking, timber decking, and composite decking

How Different Decking Materials Respond to Heat

 ​The results demonstrated clear differences between materials in both heat absorption and cooling rates: 

  • Aluminium Decking: Reached the lowest peak temperature (49.3°C) and cooled most rapidly, dropping to 33.9°C within just 15 minutes of being moved to shade. 
  • Timber Decking: Heated to a higher 56.5°C and cooled to 35.9°C after 15 minutes in shade. 
  • Composite Decking: Performed worst in heat tests, reaching 58.0°C and remaining significantly warmer at 40.9°C even after 15 minutes in shade.

 

 

 

The exceptional temperature regulation of aluminium decking is not coincidental but based on fundamental material properties that provide natural advantages in outdoor settings:

High Thermal Conductivity

Aluminium transfers heat efficiently throughout its structure instead of 

concentrating it at the surface. This high thermal conductivity means it can dissipate heat quickly rather than storing it, allowing aluminium decking to cool down faster than timber or composite alternatives when removed from direct sunlight.

Reflective Properties

Surface characteristics play a crucial role in heat management for outdoor materials. The light-coloured, reflective surface of aluminium products like ARP’s Aluminium Decking Board helps to reflect sunlight rather than absorb it, keeping the surface temperature lower even during prolonged sun exposure.

Minimal Heat Retention

Material density directly impacts heat storage capacity in decking products. Unlike dense composite materials that trap heat, aluminium releases accumulated heat rapidly once the sun’s intensity diminishes or when shade covers the area.

Minimal Heat Retention

Families with young children and pet owners will appreciate the practical 

advantages that come with aluminium decking’s temperature properties: 

  • Reduced Burn Risk: The lower peak temperatures significantly reduce the risk of burns to sensitive paws and bare feet. 
  • Faster Cooling: The quick cooling time means the decking becomes comfortable to walk on shortly after moving into shade or when the sun sets. 
  • Consistent Comfort: Even on hot summer days, aluminium decking remains more comfortable to use throughout the day compared to alternative materials. 

ARP's Aluminium Decking Solutions

ARP’s flagship decking product combines practical performance with sophisticated design elements. The ARP Aluminium Decking Board has been specifically designed as a high-performance, entry-level system perfect for retrofit or replacement applications. Key features include: 

  • Textured Surface: Enhances slip resistance while minimising heat absorption A2-s1, d0 & A2fl-s1 Fire Rating: Non-combustible for maximum safety 
  • Spans up to 600mm: Exceeds industry standards for structural integrity 
  • Low Maintenance: Requires minimal upkeep with simple cleaning 
  • Durability: 30-year warranty with a minimum 60-year life expectancy 
  • Sustainable Choice: Made from up to 67% recycled aluminium 

 

ARP offers carefully selected colour options that balance aesthetic appeal with thermal performance. ARP’s aluminium decking is available in two standard colours:

  • RAL 7016 Anthracite Grey 
  • RAL 8014 Sepia Brown 

Both finishes are applied using a seven-stage Qualicoat Standard pre-treatment process, ensuring optimal durability and heat reflection properties. 

Homeowners can transform their outdoor areas with durable, comfortable surfaces that enhance everyday living. ARP’s aluminium decking is ideal for: 

  • Garden Decks: Create comfortable outdoor living areas that remain usable even on hot days 
  • Balconies: Lightweight yet durable option for apartment balconies 
  • Pool Surrounds: Slip-resistant and cool underfoot even in direct sunlight 

 

Professional installers and commercial property managers value the long-term performance and reduced maintenance requirements of ARP products: 

  • Rooftop Terraces: Fire-resistant and lightweight, perfect for elevated installations 
  • Public Spaces: Durability and low maintenance make it ideal for high-traffic areas 
  • Walkways: Weather resistance ensures long-term performance in all conditions

Conclusion: Is Aluminium Decking the Coolest Choice?

The data clearly shows that aluminium decking—particularly ARP’s high-quality A rated products—offers superior heat management compared to traditional timber and composite alternatives. Its ability to reach lower peak temperatures and cool down rapidly makes it an ideal choice for comfortable, safe outdoor spaces. 

For homeowners seeking decking that remains comfortable underfoot even during hot summer days, ARP’s aluminium decking provides the perfect balance of performance, durability, and comfort. The combination of lower surface temperatures, rapid cooling, and additional benefits like fire resistance, sustainability, and minimal maintenance makes aluminium decking a smart investment for any outdoor space. 

Incorporating aluminium decking into your garden design ensures a comfortable, safe, and sustainable outdoor environment for both your family and pets. By choosing ARP’s aluminium decking solutions, you’re not just ensuring a cooler surface for your outdoor areas—you’re investing in a premium product designed to provide decades of safe, comfortable, and stylish outdoor living. 

Search our Shop

Sign up for Newsletter

Join our newsletter and be the first to hear about new arrivals, exclusive offers, and expert tips delivered straight to your inbox. No spam. Just the good stuff.

Sign up for Newsletter

Join our newsletter and be the first to hear about new arrivals, exclusive offers, and expert tips delivered straight to your inbox. No spam. Just the good stuff.