Composite Timber Decking

Why choose composite timber decking?

For decades, the debate has been composite decking vs timber. Advances in manufacturing now give composite timber boards a convincing grain while solving common hardwood pain points. They’re engineered from recycled wood fibres and high-density polymers, so they won’t cup, split or demand constant staining. If you want the aesthetics of Merbau or Blackbutt without the weekend maintenance, timber composite decking is the clear front-runner.

Performance advantages at a glance

• Low water absorption minimises swelling and warping.
• Factory-added pigments keep colour stable under harsh UV.
• No sap or tannin bleed—perfect near pools and light stone.
• Hidden clip systems create a sleek, screw-free surface.
• Long warranties (often 25+ years) protect your investment.

How composite timber boards are made

Manufacturers blend finely ground timber with recycled plastics, colour stabilisers and UV inhibitors. The mix is extruded into consistent profiles, embossing a realistic grain while the material is still malleable. Some products feature a co-extruded cap—a robust outer shell that locks out moisture and stains. The result: boards that weigh less than many hardwoods yet outperform them on durability.

Key buying considerations

1. Board profile

Grooved edges accept concealed fasteners for a flawless finish, while square-edge boards are ideal for picture framing stairs and perimeters.

2. Span and sub-frame

Composite spans can vary from 300 mm to 450 mm. Always check the supplier’s installation manual and pair your boards with robust decking foundations to avoid bounce.

3. Slip resistance

Look for products tested to AS 4586 and rated R11 or higher for wet areas. The National Construction Code cites these standards for balconies and pool decks.

4. Colour stability

Early-generation composites could fade dramatically; modern capped boards exhibit minimal change. Request sample pieces and leave them in direct sun to test.

5. Sustainability

Many brands disclose recycled content percentages and chain-of-custody certifications. Choosing composite timber decking diverts plastic from landfill while reducing demand for old-growth hardwood.

Cost of composite timber decking in Australia

Expect board-only prices from $90 to $180 per square metre, sitting between treated pine and premium hardwoods. While upfront costs exceed softwood, life-cycle modelling shows composites become cheaper after 3–5 years once you factor in sanding, oiling and board replacement on traditional timber decking. Installation labour is similar, although concealed clips can speed up laying on large areas.

Installation essentials: frames, fasteners & finishes

A composite deck still relies on a solid timber or steel bearer-and-joist structure. Use H3-treated framing, stainless steel screws and breathable deck waterproofing membranes over habitable spaces. Hidden fastener kits self-gap boards for ventilation and quick drainage. If extra grip is needed on stairs, integrate anti-slip finishes or contrasting nosing strips.

Care & maintenance

Forget seasonal staining. Most composite timber decking needs only a gentle sweep and an annual low-pressure wash. Should spills occur, clean within 48 hours to avoid surface marking. For shaded decks prone to mould, a pH-neutral cleaner followed by a light rinse is sufficient. Always avoid solvent-based decking treatment products unless specifically endorsed by the board manufacturer.

Design tips to elevate your project

• Picture-frame borders in a contrasting shade create a high-end look and conceal end grain.
• Mix solid and hollow boards to balance budget and strength.
• Run boards diagonally to reduce butt joints on expansive entertaining areas.
• Add LED strip lighting beneath nosing for drama and after-dark safety.
• Integrate planters or built-in benches using the same composite material for a cohesive finish.

Whether you’re refreshing a compact balcony or designing a sprawling coastal boardwalk, ArchiPro makes sourcing simple. Return to our Outdoor Decking Systems hub or continue browsing below to find the composite timber decking that turns your vision into reality.