Last Updated: August 2026
If you’re planning a timber deck in Brisbane, choosing the right materials, construction methods and deck builder can make the difference between a beautiful, long-lasting outdoor space and a deck that develops costly problems.
At DeKing Decks, we design and build timber decks throughout South East Queensland. In this guide, we’ll explain the key mistakes to avoid before you build, extend, or repair a timber deck.
When do decking mistakes happen?
Building a timber deck involves more than choosing attractive decking boards. Avoiding these common mistakes can help you build a safer, more durable deck and prevent expensive repairs later.
It is a very common deck building mistake to set timber posts in concrete. We highly recommend using stirrups to keep your timber posts above the ground, since concrete is porous and retains moisture. Over time, this moisture will rot your timber decking posts, and a major repair job may result.
Black stains on your timber decking boards can ruin the look of your deck. Stains occur when grinding sparks (or metal fragments) land on the deck; if they aren’t thoroughly removed, wet weather can cause the tannin in your timber decking boards to react with the metal, leaving stains.
This is simply avoided by not using a metal grinder on your deck. You should also ensure that no metal is left lying around on your deck, as any can cause these black stains.
The most common cause of splitting timber decking is the wrong type of timber being used. Softwood decking is far more likely to split than hardwood. If money is an issue, treated softwood can be used only for the sub-structure.
Splitting of timber decking is also likely to occur when your deck is not properly maintained. When the deck lacks weather protection, damage can become costly long-term.
Changes in weather cause timber decking boards to expand and contract. If the deck is not oiled and sealed properly, the timber is likely to split within 3 to 5 years. This mistake can result in needing to completely relay new timber decking.
Termites love damp, rotting wood. Damage caused by termites can be extensive, and may expand past your deck and into your home. The simple solution is to use steel stirrups to avoid dampness and have regular termite inspections.
Another mistake often made (usually to save money) is building the deck stairs too narrow and too steep. This can be dangerous as deck stairs are not only used for access, but also as an emergency exit. When stairs are dangerously built, people are more likely to trip and fall.
It’s also important that each step is of the same height, and that there is not an open space between steps. These tripping hazards are best avoided.
An added benefit of constructing your deck stairs correctly is that they will feature as an attractive component!
Timber decking can be subject to rust if the fixings used (that is, the bolts, screws, and nails) are not galvanised. The zinc coating of galvanised steel prevents the corrosive chemical reaction that arises between dampness, humidity, steel, and the tannins in the timber decking. Although galvanised steel fixings are more expensive, they can prevent major, expensive deck repairs.
If your timber deck begins to sag, you know you have a problem. Sagging is most often caused by using the incorrect type of timber, or the incorrect size of timber. As we mentioned above, softwood is cheaper than hardwood, but is less structurally sound. Choosing a structurally rated, durable timber helps you avoid potential sagging.
Many DIYers have been tempted to purchase their own timber decking materials and build or extend a deck without gaining approval from their local council. This is very risky, as councils have the right to make you change your deck to meet their requirements, or even force you to dismantle the timber deck completely.
There are several building codes in relation to the height, length, and strength of hand and guardrails. Not following these codes can be one of the most dangerous timber decking mistakes. The codes are there for a reason and need to be closely adhered to.
Building and installing hand and guardrails can be one of the most expensive components of deck construction. But, having to remove and replace these rails, if they do not conform to standards, will be a more costly error.
That said, expenses are minor in comparison to the possibility of a tragic accident due to poorly constructed rails or rails that are too low.
Care and time needs to be taken to ensure that your timber decking boards are laid straight. A little bit of preparation time spent using chalk-coated string can make the difference between an obvious DIY job and professionally laid timber decking boards.
If you engage us to construct or extend your existing timber deck, be assured that none of the mistakes as described will be made. At DeKing we are professional timber decking builders and provide attractive, sturdy, long-lasting, and code-approved decks. We’re trusted local experts for Brisbane homeowners.
Call us or email us today (1800 335 464) at DeKing, and we will discuss how we can best meet your needs and your budget.
Have a look at our Decking Gallery to see examples of the decks that we have constructed for satisfied customers.
A well-designed timber deck can add useful outdoor living space and improve the appearance and functionality of a home. That being said, the value it adds will depend on the quality of the construction, design, location, and how well the deck complements the property.
DIY decking can appear straightforward, but structural design, site conditions, materials, construction requirements and approvals can make a deck more complicated than it initially appears. Hiring an experienced professional can help reduce the risk of costly construction problems and ensure the deck is appropriate for the property.
In some cases, individual boards, sections or structural components can be repaired or replaced rather than rebuilding the entire deck. The appropriate solution depends on the condition of the existing structure and the extent of any deterioration. Our experts at DeKing can take a look at your deck and advise you on the best options.
Look for a builder with relevant experience, appropriate licensing and insurance, a strong portfolio of completed projects, and a clear understanding of structural and approval requirements. A reputable timber deck builder should also be able to explain the materials, construction methods, and maintenance requirements for your particular project.
Image source: www.mosbybuildingarts.com
DeKing Decks Service Areas:
DeKing Decks services Brisbane, Redlands, Bayside, Logan, Ipswich, Moreton Bay, Gold Coast, and Sunshine Coast
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