Missing Structural Fixings Lead to Unsafe Elevated Deck Repair on the Discovery Coast, QLD
Why This Deck Was Moving
On a recent elevated deck inspection on the Discovery Coast, QLD, we were called in because the western side of the deck had noticeable movement under load.
Movement in an old deck can come from a few different issues, but when a deck starts to feel loose or unstable, it needs to be taken seriously. In this case, once we got underneath the structure and investigated the framing, the reason for the movement became clear.
What We Found
Under the deck, several joists and bearers were missing proper structural fixings. There were no compliant bolts or joist hangers visible at key connection points, which meant parts of the framing were relying on resting contact only rather than being mechanically restrained.
The bigger issue was at the bearer. The last section of the original bearer beam had rotted away, and a previous repair had been stitched onto the face of the original beam. That repair had only been fixed with 75mm batten screws from one side.
Because the property was close to salt water, those galvanised batten screws had already started to rust. The repair was not suitable for the structural load it was trying to carry, and it was one of the main reasons the deck had movement.
Why This Was a Defect
This was not just a minor maintenance issue. It was a structural safety issue.
Timber framing connections need proper mechanical fixings to restrain members against movement and load. The missing bolts and joist hangers were not compliant with AS 1684.2 for residential timber-framed construction. NCC Volume Two Part 3.4.3 also requires structural connections to be installed in accordance with the relevant Australian Standard and manufacturer requirements.
When framing is only sitting in place or relying on inadequate screws, the structure can move, weaken further over time, and become unsafe for use.
What We Did First
Once we understood how bad the repair was underneath the deck, we deemed the area unsafe and fenced it off straight away so pedestrians could not access it.
We then installed acrow props to support the deck temporarily and reduce the risk while the correct repair was being designed.
That part is important. Before worrying about finishes or replacement materials, the first priority was making the area safe.
How We Repaired It Properly
Because this was a structural issue, we brought in a local engineer to inspect the deck and provide a report with the correct repair method and fixing requirements.
The engineer specified that the 240 x 45 H3 pine repair section was to be removed and replaced with a 240 x 45 spotted gum hardwood beam. The new beam was then stitched properly to the existing beam using M12 stainless steel bolts the full way along the connection.
That gave the bearer the structural fixing and durability it should have had from the start.
At the same time, we addressed the joists. Several joists were missing screws or joist hangers, so we installed stainless steel joist hangers and fixed them off with connector screws to bring the framing back to a safer and more reliable standard for pedestrian use.
Why Stainless Fixings Mattered
Because this deck was located close to the coast, corrosion resistance mattered just as much as structural strength.
The earlier repair had relied on galvanised batten screws, which had already started rusting in the salt air. For that reason, the engineered repair used stainless steel bolts and stainless joist hangers, which are far better suited to a coastal environment.
It is a good reminder that the right fixing matters just as much as the timber itself, especially on decks near salt water.
The Result
Once the temporary supports were in place, the engineering was completed, and the specified repairs were carried out, the deck was returned to a much safer condition.
What started as a deck with noticeable movement turned out to be a failed structural repair underneath, missing hardware, and rusting fixings in a coastal environment. By investigating it properly, making it safe straight away, and following an engineer’s specification, we were able to repair the structure the right way.
Why This Matters
A deck can still look fine from above while serious structural issues are developing underneath.
That is why movement in a deck should never be ignored. Missing bolts, missing joist hangers, failed repairs, timber rot, and corrosion can all combine to create a serious safety risk.
At Big Bass Building Solutions, we carry out deck inspections, structural repair work, carpentry, and rectification works across Agnes Water, 1770, and the wider Discovery Coast, QLD. Where needed, we also work with local engineers to make sure repairs are properly designed and carried out.
Need Help With a Moving or Unsafe Deck
If your deck feels loose, has visible movement, or you are worried about structural repairs in Agnes Water, contact Big Bass Building Solutions. We can inspect the issue, make the area safe, and carry out the right repair works before it becomes a bigger problem.