5 Common Decking Problems on the Sunshine Coast — And What to Do

Living on the coast is great — but it’s not always easy on your deck

The Sunshine Coast climate gives us ocean views, warm breezes, and lush backyards — but it can also be rough on timber and composite decks. Between salty air, humidity, heavy rain, and strong sun, outdoor areas need the right care to stay safe and looking good.

Here are five common decking problems we see across the region — and how to handle each one.

1. Warped or cupped boards

Heat and moisture cause timber to expand and contract, and over time, this movement can lead to warping or cupping (where the board curls at the edges). This is especially common with unsealed or poorly maintained timber.

What to do:

• Check ventilation under the deck to ensure airflow
• Sand and refinish minor cases
• Replace boards that no longer sit flat

Tip: Composite decking is much less prone to this problem.

2. Faded, grey timber

Timber naturally turns grey when exposed to UV without oil or protection. While some people like the silvered look, it can also signal drying and surface wear.

What to do:

• Clean and re-oil the deck every 12–18 months
• Sand back badly weathered sections
• Use UV-resistant coatings to preserve colour

3. Loose nails or unstable fixings

Decks shift and settle over time, which can cause nails or screws to lift — especially in high-traffic areas or decks with poor construction.

What to do:

• Replace raised nails with screws for longer hold
• Check subframe for movement or rot
• Reinforce connections where needed

We always use stainless steel fixings suited to coastal conditions.

4. Mould, mildew, or slippery surfaces

Shady decks or those near gardens and pools often stay damp longer, creating a slip risk. Mould and mildew love moist timber.

What to do:

• Use a mould-killing deck cleaner
• Improve drainage and trim plants for airflow
• Add anti-slip coating or refinish surface

Composite boards often offer better grip and are less prone to mould.

5. Deck feels spongy or unstable underfoot

This can indicate deeper structural issues. If the deck feels soft, bouncy, or unstable, don’t ignore it — the subframe may be rotting or failing.

What to do:

• Book a professional assessment
• Replace compromised joists or footings
• Consider a rebuild if multiple areas are affected

Want help fixing your deck?

We offer deck repairs, replacements, and maintenance across the Sunshine Coast. Whether you’ve got minor issues or a full rebuild on your hands, we’ll give you clear advice and a quote you can trust.

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