F17 hardwood is the safer default for most Gold Coast jetties, composite suits low-maintenance decks
Choose F17 hardwood when structural strength, repairability and buyer confidence matter. Choose marine-suitable composite when the frame is already sound and you want lower upkeep. In 2026, hardwood re-decking is commonly $320-$560 per m², while composite is more often $440-$780 per m² before frame repairs.
Hardwood vs composite decking for Gold Coast canal homes
| Factor | F17 hardwood decking | Marine-suitable composite decking |
|---|---|---|
| Upfront cost | $320-$560 per m² on a sound frame. | $440-$780 per m² on a sound frame. |
| Lifespan | Often 15-25 years with good fixings, drainage and maintenance. | Often 20-30 years as a wearing surface if the subframe is sound. |
| Maintenance | Washdowns, inspection, occasional sanding or board replacement. | Lower maintenance, but still needs washing and fixing checks. |
| Gold Coast conditions | Handles impact and point loads well, but needs end-grain protection and 316 stainless fixings. | Resists rot and splintering, but heat, expansion and slip rating need attention. |
| Repairability | Individual boards can be replaced and blended into an older deck. | Boards can be replaced, but colour and profile matching can be harder later. |
| Resale | Strong buyer familiarity when approvals and structure are documented. | Good presentation if premium product and subframe condition are documented. |
Our recommendation: use F17 hardwood by default for structural jetty repair, full rebuilds and homes where the jetty carries regular mooring loads. Choose composite when the existing frame is confirmed sound, the deck is mainly for access or entertaining, and the owner values low maintenance enough to accept the higher upfront price and summer heat checks.
Why hardwood is still the default on many canal jetties
Gold Coast canal jetties are not backyard decks. They get salt spray, wet-dry cycling, UV, boat wake, fishing gear, ladders, cleats and concentrated foot traffic. A structural hardwood board fixed into a sound hardwood frame is predictable. It can take knocks, it can be replaced one board at a time, and it is familiar to marine contractors, engineers, certifiers and property buyers.
F17 hardwood matters because the board is not just a surface finish on many older jetties. It often contributes to stiffness, load sharing and the way the deck works with joists and bearers. If you are repairing an older timber jetty, matching the existing structural logic is usually cleaner than introducing a product with different movement and fixing behaviour.
The weakness of hardwood is maintenance. It can check, cup, splinter and rot if water is trapped. End grain needs attention. Fixings must suit the environment. If a quote saves money by using poor screws, spacing boards badly or ignoring drainage, hardwood will not perform as it should. The timber is only one part of the system. The frame, fasteners and detailing matter just as much.
Hardwood is also not always the cheapest over 25 years. If the owner will not wash down the deck, clear leaves, inspect fixings or replace damaged boards early, a low-maintenance surface may be better. The right question is not "which product is best?" It is "which product suits this structure, this owner and this use?"
When composite earns its higher price
Composite decking is attractive because it reduces splinters, rot risk and ongoing coating decisions. It can be a good fit for canal homes in Broadbeach Waters, Mermaid Waters and Hope Island where the jetty is used heavily by family and guests, and where the owner wants a clean barefoot deck with less timber upkeep. It is also useful where the structure is more about access to a pontoon than heavy workboat use.
The limitation is that composite does not fix structure. If joists are soft, pile caps are crushed or piles are moving, the first spend belongs under the deck. We often inspect an old deck where the owner wants composite, then find $5,000-$15,000 of frame work must happen first. That is not a reason to reject composite. It is a reason to compare total installed cost instead of board price.
Heat is the other honest drawback. Gold Coast summer sun can make dark boards uncomfortable. Lighter colours and ventilation help, but if children use the jetty barefoot in January and February, test a sample in sun. Slip rating also matters around ladders, swim steps and hose-down areas. The best composite product on paper can still be the wrong choice if it is too hot, too slippery or unsupported by the fixing system the site needs.
Choosing decking during a repair or rebuild?
We can inspect the frame first, then price hardwood and composite honestly from the same scope.
Cost comparison on a typical Gold Coast re-deck
Take a 16 m² jetty deck on a canal home in Runaway Bay. The piles are sound, but the old boards and a few joist ends need attention. With F17 hardwood at $430 per m², the decking line is about $6,880. Add $2,400 for joist and bearer repairs, $1,200 for 316 stainless hardware and $650 for disposal, and the job is around $11,130 before any approval or engineering review.
With composite at $610 per m², the decking line is about $9,760. The same joist repairs may increase slightly because fixing layout and ventilation need care, so allow $2,800. Hardware and trims might be $1,650, with disposal still around $650. That puts the installed comparison near $14,860. In plain numbers, composite may add about $3,700 on this size of job.
If the owner plans to keep the home for 10 years and wants less upkeep, that extra spend may be rational. If the owner is preparing for sale, a clean hardwood repair with documented approvals and compliance may be better value. Buyers care whether the jetty is safe, straight, approved and easy to insure. They do not always pay back premium board cost dollar for dollar.
There are times neither surface is the right immediate spend. If a low-tide inspection finds loose piles, fix those first. If the jetty has storm damage, document cause before replacing boards. If the deck is ugly but structurally sound and the home budget is tight, a maintenance wash, screw replacement and a few boards may be enough for one more season. The maintenance guide covers that lower-cost path.
Compare hardwood and composite for your jetty
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