Ballarat is hard on outdoor timber in a different way from hotter, drier parts of Victoria. Decks here spend much of the year damp. Bureau of Meteorology long-term averages for Ballarat Aerodrome show rain on around 167 days a year and morning humidity close to 90 per cent through winter. Timber that stays wet goes grey, grows mould and algae, gets slippery and, in time, starts to rot around fixings and joins. Summer sun then dries and splits the surface.
Deck restoration can range from a good clean and a fresh coat of oil to a full job with board replacement, sanding and several coats. The right choice depends on the condition of the timber and the coating.
Clean, sand or both?
When cleaning is enough
If the deck is grey or dirty but the boards are mostly smooth and sound, a thorough clean with a suitable deck cleaner, followed by re-oiling, may be all it needs. Cleaning removes dirt, mould and weathered fibres. Pressure washers can help, but used too close or too hard they can raise the grain and damage softer timber.
When sanding is needed
Sanding is usually needed when:
- the old coating is peeling, flaking or patchy;
- the boards are rough, splintery or have raised grain;
- there's a build-up of dark or film-forming coatings;
- you're changing from one type of coating to another;
- boards are cupped or uneven.
Sanding removes the weathered surface and old coatings so the new oil can soak in evenly.
Repairs first
Look for:
- soft, spongy or split boards, especially at the ends and near downpipes;
- loose or popped nails and screws;
- rusty fixings staining the timber;
- rot in joists and bearers, especially close to the ground or where water pools.
Replace damaged boards before sanding. Structural problems with the frame are a job for a carpenter or builder.
Steps, balustrades and screens
The deck boards are only part of the job. Deck steps, handrails, balusters, privacy screens and pergola posts usually need the same cleaning and oiling, and they take longer per square metre because they are mostly hand work. Steps also wear faster and get slippery first in wet weather. When you ask for a quote, say which parts you want included, and whether any balustrades are painted rather than oiled. Treating everything at once gives a more even colour, and it saves a second visit.
Choosing a coating
Most Australian decks are finished with a penetrating oil, which soaks into the timber, rather than a film that sits on top. Film-forming coatings can peel when moisture gets underneath, which is more likely in a wet climate. Options include:
- Natural oils, which give a traditional look and need more frequent recoating.
- Water-based decking oils, which dry faster and clean up with water.
- Tinted oils, which add colour and some extra UV protection.
Ask whether the product includes mould resistance, and how often it needs reapplying in a climate like Ballarat's.
Timing in a wet climate
Decking oils need dry timber to soak in. Bunnings' deck sanding guidance and most product labels advise working on dry timber in dry weather. In Ballarat that usually means waiting for a run of fine days, and often planning deck work for late spring through early autumn. Ask the contractor how many dry days they need before and after coating.
Verandahs and heritage homes
Many Ballarat period homes have timber verandah floors. They get some shelter from the roof but still weather at the edges and steps. Restoration follows the same approach as a deck. If your home is in a heritage overlay, check with the City of Ballarat before making changes that alter the look of the verandah.
Keeping a deck in good shape
- Sweep leaves and debris off regularly, especially in autumn. Wet leaves hold moisture against the boards.
- Keep gaps between boards clear so water drains.
- Clean off mould or algae when it appears.
- Check for loose fixings each spring.
- Re-oil before the old coating has fully worn away. Many decks need it every year or two, depending on exposure.
Regular maintenance usually means a lighter job each time, rather than a full sand every few years. Keeping a note of the product used and the date it was applied makes the next recoat easier, because the contractor can choose a compatible oil.
What it costs
We haven't found a reliable published per-square-metre figure for deck restoration across Australia. Quotes depend on deck size, condition, repairs, stairs and balustrades, and the coating. Ask for an itemised quote. See prices.
Frequently asked questions
Should I sand or pressure wash my deck?
If the boards are smooth and the old coating has worn evenly, a clean may be enough. If the surface is rough, splintery or coated with peeling product, sanding gives a better result. Many restorations use both: a clean first, then a sand.
Why is my deck slippery in winter?
Usually mould, algae or moss growing on damp timber. Cleaning removes it, and some deck oils include mould inhibitors. Keeping leaves off and allowing water to drain also helps.
How long should I wait to oil a deck after rain?
Long enough for the timber to dry right through. That can take several dry days in cool weather. Follow the product label and the contractor's advice.
Can I put a film-forming stain or varnish on my deck?
You can, but film coatings tend to peel when moisture gets underneath, which then needs sanding off. Penetrating oils are more common on Australian decks.
How often should a deck be re-oiled?
It depends on exposure. North- and west-facing decks in full sun, or decks that stay wet, may need re-oiling every year. Sheltered decks can go longer.
Ask about your deck
Send your suburb, the rough size of the deck, its condition and some photos. With your consent, we'll pass your enquiry to one independent local floor sander, once one is appointed, who can inspect and quote. There's no cost or obligation to enquire.