Durable Australian hardwood, chosen for your site
There's no single best timber, but durable Australian hardwoods are the standard for South Australian conditions. Spotted gum, blackbutt, jarrah and merbau all handle the heat, UV and dryness well when they're detailed and finished properly.
Which one is right comes down to the look you want, your budget, and the site. A shaded south-facing deck has an easier life than one baking on a west wall. A coastal block across the Fleurieu asks more of the timber and the fixings than one in the hills.
We don't default to one species. We pick it once we've seen where the deck is going and how you'll use it.
What Adelaide's climate does to a deck
Heat & UV
Long hot summers and strong sun fade and dry timber. A durable species and the right finish slow the greying and checking.
Movement
Big day-to-night and season-to-season swings make boards expand and shrink. Correct gaps and fixings let the deck move without cupping or splitting.
Winter wet
Moisture returns in winter. Good drainage, airflow under the deck and a sound substructure keep rot away.
Coastal salt
Closer to the coast across the Fleurieu, salt air is hard on cheap fixings. Durable timber and the right grade of fastener matter more here.
The hardwoods we work with
Spotted gum. A favourite for Australian decks. Hard, durable and tough, with a flowing grain and warm tones that range from pale to chocolate. Handles heat and wear well, which is why it's so widely used.
Blackbutt. Durable, with a more even, pale-to-golden colour for a cleaner, contemporary look. A common choice in bushfire-prone areas given its fire performance, relevant for parts of the hills.
Jarrah. A classic Western Australian hardwood with a deep red colour and excellent durability. Rich and traditional, and it ages beautifully when looked after.
Merbau. Stable, durable and widely available, which keeps it popular and often a touch more affordable. It can bleed tannin early on, so it wants the right detailing and a wash-down in the first weeks.
Each weathers differently and carries a different price. The point isn't the cheapest board, it's the right board for your deck.
Why we build in hardwood
Treated pine is the cheapest and fine for some jobs, but it's the softest and needs the most upkeep. Composite skips the sanding and oiling and resists fading, but it's a manufactured look and can get hot underfoot in full Adelaide sun. Hardwood asks for occasional maintenance and rewards it: it ages with character and, built properly, lasts decades.
We build in hardwood because it suits the homes we work on across Adelaide's south. If composite is right for your situation we'll tell you honestly. The material should serve the deck, not the other way around.
Decking timber, answered honestly
What's the best decking timber for Adelaide's climate?
There's no single best, but durable Australian hardwoods like spotted gum, blackbutt, jarrah and merbau are the standard for SA conditions. The right one depends on your site, the look you want and your budget. We choose it once we've seen your block.
What does the SA climate do to a deck?
Heat and UV fade and dry the timber, temperature swings make boards move, and winter brings moisture back. Coastal blocks add salt. A deck built for SA uses a durable species, correct gaps and fixings, and a finish suited to the exposure.
Is hardwood better than composite in SA?
Both work. Composite avoids oiling and resists fading but is a manufactured look and gets hot in full sun. Hardwood needs occasional upkeep but ages with character and lasts decades. We build in hardwood and pick the species for the site.
How do I stop my deck greying in the sun?
Untreated, most hardwoods silver off, which some people like. To hold the colour, oil the deck on a regular cycle, more often on a hot west-facing deck than a shaded one. We set you up with a realistic routine for your deck.
Not sure which timber suits your block?
Tell us about your deck and we'll be in touch within 24 hours. We'll talk through the right timber for your site, aspect and budget at the quote visit.