Why Treated Pine Still Deserves a Place in Sunshine Coast Decking
Treated pine might not have the prestige of hardwood or the longevity of composite, but it’s still one of the most practical, cost-effective decking materials available… especially when it’s done right.
For Sunshine Coast homeowners looking to balance budget, durability, and style, treated pine can be a smart choice when properly selected, sealed, and maintained. Here’s how to get the best out of it.
We often are asked about the viability of pine decking. Let’s look at the ins, outs, pros and cons!
What Makes Treated Pine Different
Pressure treatment process
Treated pine starts as standard softwood (usually Radiata Pine) that’s infused under pressure with chemical preservatives. These treatments protect the timber against decay, fungus, and termites. These things are essential for Queensland’s warm, humid climate.
Common treatment levels
Suitable for above-ground use such as decking, framing, and pergolas.
Designed for in-ground or high-moisture areas such as posts and bearers.
Always check the H-rating stamp before purchase to ensure the timber suits your application.
Sustainability edge
Most treated pine decking sold in Australia comes from plantation-grown sources, which makes it a more environmentally sustainable option than some imported hardwoods.
When Treated Pine Makes Sense
You’re building on a budget
Treated pine is the most affordable decking timber, typically costing $350–$550 per m² installed which makes it ideal for homeowners wanting to expand their outdoor space without breaking the bank.
You plan to paint or stain
Because pine has a light grain, it takes stains, oils, and paints beautifully, and gives you flexibility to match your deck to your home’s colour palette.
You’re designing for flexibility
There are advantages to choosing to use pine for your deck. Pine is easy to cut, shape, and easy to work with. It is perfect for decks with curves, steps, or custom features that would be expensive to create in hardwood.
You’re okay with regular maintenance
While treated pine can last 10–15 years or more, it does require consistent upkeep to stay in good shape.
When Treated Pine Isn’t Ideal
You want ultra-low maintenance
If you prefer a “set and forget” option, composite or hardwood decking may be a better long-term investment.
You’re near the ocean
Salt exposure can accelerate corrosion of fixings and surface degradation. If you’re in a coastal location, pine decks need extra sealing and stainless-steel fasteners. So remember to take all these things into account.
You need a premium finish
Even with high-quality staining, treated pine won’t fully mimic the richness or depth of a hardwood grain.
How to Maintain Treated Pine Decking
A well-maintained pine deck can last for decades. Here’s how to keep it strong, safe, and looking fresh.
1. Seal it early
Apply decking oil or stain within the first 6–8 weeks of installation. This protects your deck against UV rays and moisture ingress once the timber has acclimatised.
2. Recoat regularly
Reapply decking oil every 12–18 months to maintain colour and weather protection. Clear finishes may need more frequent reapplication than tinted oils. The greater the exposure to the elements, especially full sun, the more maintenance your deck will need!
3. Keep it clean
Sweep regularly to remove leaves and debris. Every few months, use a mild detergent and soft broom to clean the surface and prevent mould or black spotting.
4. Inspect fixings and joints
Check annually for rusted screws, lifted boards, or loose nails. Diarise to check after every wet season to keep on top of maintenance issues.
How Long Treated Pine Decks Last
When you maintain your pine deck properly, treated pine decking can last 15–25 years on the Sunshine Coast. Longevity depends on:
- The H-rating and quality of treatment
- How well it’s sealed and maintained
- The design and drainage of the structure
- Proximity to salt air or constant moisture
A simple rule of thumb: if your deck is exposed to heavy rain or full sun, maintenance frequency matters more than the timber itself. Stay ahead of developing problems and your deck will last longer!
H2: Treated Pine vs Other Materials
| Material | Approx. Cost (Installed) | Lifespan | Maintenance Level |
| Treated Pine | $350–$550/m² | 15–25 years | High |
| Spotted Gum | $550–$900/m² | 20–30 years | Medium |
| Composite | $700–$1,200/m² | 25–35 years | Low |
H3: The takeaway
Treated pine wins on price and versatility, but if you want fewer weekends spent sanding and oiling, hardwood or composite will pay off long-term.
H2: Pro Tips for Better Results
H3: Use quality fasteners
Always use 316-grade stainless steel screws or nails in coastal or humid zones to prevent rust stains and corrosion.
H3: Allow for airflow
Proper spacing and subframe ventilation prevent rot and mould growth underneath the boards.
H3: Don’t skip the end-sealer
Seal all cut ends immediately after trimming as untreated ends are vulnerable entry points for moisture and decay.
H2: Key Takeaways
- Treated pine is affordable, flexible, and sustainable when properly maintained.
- Use H3 or H4 rated timber depending on your application.
- Expect regular sealing and re-oiling every 1–2 years.
- In coastal areas, invest in stainless fixings and UV-tinted oils for longevity.