Choosing the Best Decking Timber for You

How to choose the right decking timber. /

Timber decking is a must feature for the outdoors of Australian homes. If you plan to renovate your home by building a deck, you need to choose the best decking timber to suit your needs.

Read below what to consider before making a choice and the pros and cons of the most popular timber types out there to make sure you’ll make the best option suited for our unique Australian climate.

Things to consider before choosing decking timber

The location of the deck

The most important thing to have in mind to choose the proper timber is your location and climate. The amount of moisture will determine how frequently you need to reseal it to preserve its condition.

Constant sunlight will fade pain faster. If you live close to the ocean, you need to choose timber that can resist salt corrosion.

What’s the purpose of your deck

Define what you’ll use the deck for. If you’re planning to build a pool, you need to choose moisture resistant options. If you build it as a BBQ area, you need to opt for a solid version that can tolerate small imperfections.

Your budget

Timber types may vary in price. Determine how much money you’re willing to spend for your deck to narrow the types of timber you can afford. The good news is that there’s a variety of materials suitable for every budget.

Constructing a deck is a long-term investment, and that’s why it’s costly. When you’re budgeting for your project, keep in mind that you’d want to build a durable deck that can withstand the test of time.

The style that you’re going for

When you’re choosing the timber, consider a variety that will not only suit your needs but will be aesthetically pleasing as well.

The amount of maintenance

Different types of timber require different maintenance. Some types are relatively easier to maintain compared to others. Before choosing a material, make sure that you know what regular maintenance it needs to look good.

Maintaining timber decking

Timber is a natural wooden product. It reacts to the weather conditions and ages with time.

No matter what type of timber you choose for your deck, have in mind that all types of timber turn grey and discoloured due to factors such as ultraviolet light, moisture and water, especially if they aren’t protected qualitatively.

Don’t leave the decking without protection for too long. Re-coat the timber as many times as you have to preserve the fresh look of your deck.

How to properly seal the timber

Timber needs to be sealed on all sides, including the cut edges, to be protected from damage. Keep in mind that they will still occur naturally over time. Old timber begins to crack, split, swell and even accumulates mould.

For these reasons, timber needs to be protected with high-quality paint and sealant. But doing it once during the installation is not enough. You need to maintain the protection regularly and apply new coats according to the manufacturer’s instructions.

Resin bleeding

Timber is predisposed to resin bleeding. Many natural softwoods contain resins. Dark coloured timber exposed to weather conditions increase the absorption of heat and moisture and can trigger the timber to bleed resin. If this happens, it needs to be scraped out, and the surface needs to be sanded and recoated.

This doesn’t prevent the timber from bleeding again, so you will have to maintain it regularly.

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Timber decking alternatives

The durability of the deck depends on the timber you choose. Timber decking should last for years if constructed properly.

So, let’s take a look at some of the best timber varieties you can choose from in Australia for your deck.

Treated pine

Treated pine is one of the most popular decking alternatives in Australia. It’s grown in plantations, which makes it an eco-friendly option.

Treated pine is timber that has been infused with chemicals and pressure-treated to provide long-term resistance from insect and termite infestations.

The timber is very durable and is one of the least expensive decking materials. Treated pine can be painted and stained, so you can paint your deck any colour you want.

Treated pine requires to be oiled or sealed once a year for prolonging its life.

Pros of treated pine deck

  • Environmentally friendly
  • Resistant to infestations
  • Easy installation process
  • Affordable option
  • The material is strong and pressure resistant
  • It can be painted and stained

Cons of treated pine deck

  • Uneven texture and consistency
  • It’s softwood which makes it receptive to cuts and scratches


Jarrah is a largely sized hardwood that can be found in Western Australia. Jarrah is an expensive timber with beautifully saturated colour, which varies from rich red to dark brown. It is a preferable choice for people aiming to build an aesthetically looking deck.

Jarrah is also fire and weather resistant. It’s protected from rotting, insects and termites infestations.

The timber needs regular maintenance. It needs to be sealed and sanded every year to retain the beautiful colours with the years.

Pros of Jarrah

  • Weather, rot and infestation resistant
  • Preserve its beautiful colours over the years
  • Easy to manipulate softwood
  • Slight resin leach

Cons of Jarrah

  • Requires regular maintenance
  • Relatively expensive type of timber
  • Limited availability


Blackbutt is timber that can easily be found in Australia and particularly in Queensland and New South Wales. Its high durability is great for the Australian climate.

This type of timber can be seen in decking in residential and commercial properties. The colour of blackbutt is consistent and vary from light brown to saturated blonde yellow. The timber can be stained.

Blackbutt has a consistent texture and vertical lines. It’s fire-resistant, and it’s the best option for fire predisposed areas.

The timber requires sealing and regular re-sealing; otherwise, it can easily crack and split.

Pros of blackbutt

  • Highly durable hardwood
  • Fire resistant

Cons of blackbutt

  • Doesn’t react well to painting over
  • It may leach resin when wet
  • Requires regular re-sealing

Spotted gum

Spotted gum can be found in any region in Australia. It’s a durable material and has minimum resin leach. The hardwood is environmentally friendly, and it can last for more than 40 years if taking care of.

The colour of spotted gum may vary from light brown to dark chocolate brown. Like blackbutt, spotted gum is fire resistant.

Pros of spotted gum

  • Eco-friendly timber
  • Long-lasting
  • Relatively easy to maintain
  • Fire resistant
  • Beautifully looking grain

Cons of spotted gum

  • Expensive
  • Requires drilling
  • Predisposed to moisture and mould


Merbau originates from South Asia and is often cut from tropical forests, which isn’t environmentally friendly. The hardwood is strong, but at the same time, soft and easy to work with. It can last up to 40 years, and it’s durable and relatively cheap.

Its colours vary from light brown to deeper red throughout the years. It tends to bleed resin regularly and can stain. To reduce the leach, you need to pre-oil the timber at least two times before installation and re-oiled it yearly.

Pros of merbau

  • Durable and easy to work with
  • It can last more than 40 years
  • Fire resistance
  • Beautiful saturated colours
  • Smooth surface

Cons of merbau

  • Require regular maintenance
  • Bleed resin when wet
  • Not environmentally friendly


The timber can be found mainly in NSW and Victoria. Stringybark comes in a variety of shades of white, red and yellow and has beautiful patterns. The hardwood has a fine texture. It’s a durable and relatively cheap decking option.

Pros of stringybark

  • Durable hardwood
  • Termite resistant
  • Affordable timber

Cons of stringybark

  • Requires pre-drilling
  • It has gum veins


Ironmark is a heavy timber that can last for more than 50 years. It’s highly dense, which makes it difficult to work with. Its colours vary from light grey and light brown to deep red.

Ironbark is fire, rot and termites resistant. It’s a great choice for pool decking as it reacts well to moisture.

Pros of ironbark

  • Long lasting material
  • Fire and rot resistant
  • Insects and termites resistant

Cons of ironbark

  • Difficult to work with
  • Relatively expensive
  • Needs to be pre-drilled


Teak is one of the most expensive types of timber. Despite that, it’s one of the best decking woods out there. Teak is also insect and termite-resistant.

This type of timber is one of the hardest and easily lasts for a long time. It’s also resistant to scratches and cuts. It’s a perfect option for high-traffic areas. It’s also moisture resistant which makes it great for pool deckings and saunas. It needs to be oiled every 2-3 years, which makes its maintenance relatively easy.

Pros of teak

  • Long lasting
  • Water and moisture resistant
  • Termite and insects resistant
  • Rot resistant
  • Scratch resistant
  • Easy maintenance

Cons of teak

  • It’s expensive

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Dean Phillips
Dean Phillips
5 years ago

I had no idea that timber reacted to the weather and aged with time. My wife has been wanting to install a deck in our backyard so that we can throw barbecues for our friends in the summer. We may have to find a reputable company that can help recommend the best materials and build a deck for us.

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