Best Decking Timber for Gold Coast Homes: Spotted Gum vs Ironbark vs Merbau

A deck on the Gold Coast works harder than almost anywhere in Australia: salty air, intense UV, summer humidity and hungry termites all attack it year-round. The material you choose determines how your deck looks in year one — and what it costs you in year ten. Here's our honest comparison after building and restoring hundreds of decks across the coast.

Spotted Gum — the coastal favourite

Spotted Gum is an Australian hardwood with natural durability, beautiful varied grain and excellent termite resistance. It's dense, stable and handles coastal conditions brilliantly when oiled regularly. If you want a premium timber deck that ages gracefully, this is usually our first recommendation.

Ironbark — maximum durability

One of the hardest commercial timbers in the world. Class 1 durability, outstanding termite resistance, and a rich red-brown tone. It's heavier and harder to work (which adds labour), but for exposed positions and pool surrounds it's nearly indestructible.

Merbau — the value hardwood

Merbau is popular for good reason: naturally durable, termite resistant and more affordable than premium Australian hardwoods. Two caveats — it bleeds tannins when new (keep it away from light-coloured paving until sealed) and quality varies, so sourcing matters.

Treated pine — budget-friendly, maintenance-hungry

Treated pine is the most affordable option and fine structurally — we often use it for subframes. As a decking surface it needs more frequent maintenance, marks more easily, and won't match hardwood's lifespan in coastal exposure.

Our quick recommendation guide

• Beachfront or pool deck: Ironbark
• Best all-rounder: Spotted Gum
• Tight budget, still want hardwood: Merbau
• Painted or hidden structures: Treated pine (structure), hardwood surface

Whatever you choose — build the bones right

Most deck failures we're called to repair aren't the boards: they're the substructure. Correct joist spacing, stainless or hot-dipped galvanised fixings, ventilation and drainage matter more than the brand of board on top. That's where 11+ years of local experience pays for itself.

Thinking about a new deck or restoring a tired one? We'll give you an honest repair-vs-rebuild assessment and a detailed free quote.

Thinking about your own project? See our deck building & repairs and custom carpentry services, or the suburbs we cover.