How to Keep Your Composite Deck Cool on the Sunshine Coast
Composite decking temperature is a question we’re often asked about at Sunshine Coast Decking. Composite decks have become a favourite among Sunshine Coast homeowners for their low maintenance, durability, and stylish look. But the question always comes up again and again: does it get hot in summer? A lot of people want to know if there is such a thing as heat resistant decking. Well, let’s find out.
The short answer to whether composite decks get hot is: yes, they can. But to be completely open and fair, so can timber, tile, and concrete decks. The good news is that with the right design choices, you can dramatically reduce surface heat and enjoy barefoot comfort all year round.
Why Composite Decks Can Get Warm
I always recommend that you do some research. It’s important to check out (and compare) the specs of all the products you’re considering because you’ll find that they behave different due to 3 main things:
- H3: Solar reflectance
- H3: Thermal conductivity
- H3: Heat capacity or specific heat.
The lighter colour of a product can help lower the specific heat rating, but every product has its own inherent ability to retain or reject heat. Another important measurement is the product’s thermal conductivity. Specific heat is a product’s ability to take on and then retain heat. A lower specific heat will mean that it will be cooler to touch. Again, it’s not as simple as saying a darker colour board will be hotter than a lighter one. If that was the case, we’d all just get a light board and not worry about what it’s made from.
Material composition
Composite decking boards are made from a blend of wood fibres and recycled plastics and some of other materials (brand-dependent). The polymers within can retain heat longer than natural timber, especially in darker colours or full sun exposure.
Surface density
Because composite boards are denser and less porous than timber, they may absorb and hold radiant heat for longer. Again, this is a general rule of thumb.
Reflectivity factor
Some composite boards have a textured or matte finish that absorbs more heat than lighter, reflective surfaces.
More than Just How it Looks
There is more to decking choice than meets the eye, literally. Your choice (or your decision-making process is especially important when you are planning for a sunny deck.
Colour Choice Makes a Big Difference
Just like your car seats or roof tiles, colour plays a huge role in how hot your deck feels underfoot.
Light colours stay cooler
Choose shades like silver, ash, beige, or light grey to reflect more sunlight. These can stay up to 10–15°C cooler than dark browns or charcoals in direct sun.
Dark colours absorb heat
Deep timber tones look great but can feel uncomfortable barefoot at midday. If you love dark decking, consider strategic shading or orientation to offset heat buildup.
Use colour variation
You might like to design in the use of lighter boards in high-traffic zones (like steps or lounge areas) to make a noticeable difference in comfort.
Deck Orientation and Design Considerations
Sun direction matters
A north- or west-facing deck will cop the most intense afternoon sun on the Sunshine Coast. If you’re designing from scratch, either consider the position of the deck for morning light instead or if you can’t do that (and the location of your deck is not changeable, make a wise material choice.
Include natural shade
Existing trees, pergolas, or nearby walls can create dappled shade that significantly reduces surface temperature.
Choose ventilated construction
A well-ventilated subframe allows air to flow underneath, which helps dissipate heat and keeps the boards cooler.
Install gaps correctly
Proper spacing (usually 4–6mm between boards) improves airflow and prevents heat from becoming trapped.
Shading and Cooling Solutions
Add a roof or pergola
A partial roof or shade sail can block direct sun during the hottest part of the day. If your deck is west-facing, this is an especially important consideration.
Integrate plants and greenery
Vertical gardens, hanging planters, and potted palms can reduce radiant heat and create a more comfortable microclimate. Plant foliage does create a significant cooling effect and you can plan to your advantage.
Use outdoor rugs or mats
Heat-resistant outdoor mats can protect high-traffic areas and make them barefoot-friendly even in summer.
Mist or water systems
A lovely way to deal with the summer heat is to incorporate a fine misting system in chosen areas. Such a system can drop deck surface temperatures by several degrees during extreme heat.
Composite vs Timber Heat Comparison
Many homeowners assume timber stays cooler, but the reality depends on the species and colour. The following table is just a guide to temperatures, as there are differences that are brand dependent because of choice of material (especially in different composite brands).
| Deck Material | Typical Surface Temp (Full Sun) | Maintenance Level | Colour Options |
| Light Composite | 45–50°C | Low | Light greys, silvers, beiges |
| Dark Composite | 55–65°C | Low | Browns, charcoals |
| Light Timber (e.g. Pine) | 45–55°C | High | Can fade or darken |
| Dark Hardwood (e.g. Merbau) | 55–65°C | Medium | Rich red-brown tones |
Key takeaway
Both timber and composite decks absorb heat in full sun, but the difference between colours can be greater than the difference between materials.
Choose the Right Composite Deck for Sunshine Coast Conditions
Look for capped boards
Capped composites have a protective outer layer that improves UV resistance and reduces surface heat absorption.
Check manufacturer ratings
Some brands (like Trex, Millboard, or NewTechWood) publish independent heat-reflectivity tests. It’s always wise to do your research and compare product specs before you make your product choice.
Opt for slip and heat-tested options
Boards rated to AS 4586 (Slip Resistance) and ASTM C1371 (Solar Reflectance) give you more confidence that your deck will perform well under summer conditions.
Pro tip: You’ll need to consider slip resistance for pool decks anyway. And take it from me, there’s nothing more dangerous and annoying than slipping on a slightly wet deck.
Consider barefoot-friendly ranges
Several composite ranges are specifically engineered for comfort underfoot. Make the right choice for pool surrounds or kids’ play areas.
Pro Tips for a Cooler Deck
- Go for lighter tones wherever possible.
- If you must choose dark boards, consider strategically shading important walkways to protect against the elements.
- Add shade sails or roof structures for west-facing decks.
- Include ventilation gaps to encourage air movement.
- Combine plants and reflective surfaces to minimise heat buildup.
- Avoid using dark furniture or mats that trap heat.
Key Takeaways
- Composite decks can get warm in summer, but smart design keeps them comfortable.
- Colour, orientation, and ventilation make the biggest difference.
- Light-coloured, capped composite boards stay noticeably cooler.
- Pair good materials with smart shading for year-round comfort.
Call us today at Sunshine Coast Decking. We’re experts in decking and would love to help you make the right decisions!