Spotted Gum Timber Decking

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SKU: GHT-1936 Categories: Decking, Timber Decking Brand: Greenhill Timbers Product Width: 135mm Product Width: 19mm Janka Rating: 10.1

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Spotted Gum decking in 86 × 19 mm and 135 × 19 mm: a dense Australian hardwood with Class 1 durability above ground, Janka hardness 10.1 kN and a place on the AS 3959 bushfire-resisting timber list, so it can be used for decking up to BAL-29.

Sizes and lengths: 86 × 19 mm and 135 × 19 mm in random lengths, plus 135 × 19 mm long lengths of 5.7–6.0 m for fewer joins
Timber: Spotted Gum (Corymbia maculata, C. citriodora and C. henrii), grown from north-east Victoria to Queensland; light brown to dark red-brown; about 990–1010 kg/m³
Durability: Class 1 above ground, which the Queensland Government rates at more than 40 years’ expected life; Class 2 in-ground; the heartwood is termite resistant
Tannin: WoodSolutions says Spotted Gum is less prone to tannin bleed than other species
Bushfire: on the AS 3959 list of bushfire-resisting timbers, so it can be used for decking up to BAL-29 (BAL-40 and Flame Zone need tested systems)
Joist spacing: 450 mm centres, as WoodSolutions recommends for decking; its deck design guide allows up to 500 mm for 19 mm hardwood, or 350 mm if the boards run at 45°
Gaps: 3–4 mm between 86 mm boards and 4–5 mm between 135 mm boards at installation (WoodSolutions deck design guide)
How much for a deck: a 20 m² deck needs about 140 lineal metres of 135 mm board or about 225 lineal metres of 86 mm, plus about 10% for offcuts
Low decks: under 400 mm off the ground, WoodSolutions suggests 5–6 mm gaps and at least 40 mm between the deck and the house, for airflow
Fixing: two fixings per board at every joist, at least 12 mm from edges and ends. Pre-drill this dense hardwood. Use stainless steel within 1 km of the coast or 1 m of a pool. See our decking screws
Finishing: coat every face and cut end, ideally before fixing, then recoat at least once a year or as the oil maker directs (WoodSolutions); left bare, it weathers to silver-grey. Oils we stock: CUTEK CD50, Intergrain Universal Timber Oil or Sceney’s Timber Decking Oil
At Greenhill: stocked at 170 Settlement Road, Thomastown, with pickup or delivery across Melbourne and regional Victoria. Compare species on our hardwood decking page.

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Product Description

Reliable Spotted Gum Decking in the Long Run

Spotted Gum has earned its reputation with builders for good reason; it lasts. It’s a Class 1 timber for above-ground use, which means it’s up there with the most durable decking options. Whether your deck is exposed to full sun, salt air, or even bushfire, this timber holds steady. It is also termite-resistant, which is one less thing to worry about down the track.

The boards have a natural strength that helps them resist wear and surface damage. You’ll often see Spotted Gum used in spots where durability really matters, like walkways, outdoor steps, or wide open decks.

A Bit of Character in Every Board

One of the things people like about Spotted Gum is how no two boards look the same. You’ll get colour variation that can shift from soft browns to deep reds. It’s got a bit more texture and interest than some other hardwoods, especially with its occasional wavy grain.

If left unfinished, it weathers to a soft grey. But if you want to bring out the depth of colour, a coat of oil goes a long way. Either way, it holds its shape well and doesn’t twist much when installed properly.

Sizes and Options at Greenhill Timbers: 86 x 19mm, 135 x 19mm

We stock Spotted Gum decking in a few handy options:

86 x 19mm
135 x 19mm Random Lengths
135 x 19mm Long Length

All boards are kiln-dried for stability and ready for external use. Whether you’re building a new deck or patching up an old one, we’ve got the stock to match.

Spotted Gum Decking Supplied by Greenhill Timbers

At Greenhill Timbers, we know what works and Spotted Gum is a staple for a reason. We supply it to homeowners and tradies across Melbourne who want something that’ll last and still look good after a few years in the weather.

If you need help figuring out quantities, board spacing, or which size to go with, give us a call or drop by our store. We’ll sort you out with what you need to get the job done right.

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Janka Rating

Spotted Gum Timber Decking — Janka hardness: 10.1 kN

What Is the Janka Rating?

The Janka rating is a way to measure how hard a timber is, specifically, how much force it takes to push a small steel ball halfway into the wood. The number you get is shown in kilonewtons (kN). A higher Janka score means a harder, more durable timber. Builders and floor installers use it to work out which timbers hold up better in busy areas.

Here’s a rough guide to how some timbers sit on the scale:

Brazilian Walnut – around 16.0 kN
Spotted Gum – roughly 11.0 kN
Tasmanian Oak – about 5.5 kN
Radiata Pine – close to 3.0 kN

Keep in mind: these values can vary depending on moisture content and grain direction.

It's One Part of the Decision

Hardness is useful to know, but it’s just one factor. Janka doesn’t tell you how a timber reacts to heat or humidity, how stable it is, or how easy it is to cut and install.

Some of the hardest woods can be difficult to work with. Others, even if softer, might be more stable or forgiving on-site.

At Greenhill Timbers, we look at the whole picture, not just the numbers. All our timbers are structurally graded and covered by a 25-year guarantee. We'll help you pick something that works for your project, not just on paper.

Delivery Options

Melbourne-Wide Delivery

We carefully prepare your order and organise pick-up or delivery that suits your schedule, ensuring your satisfaction when you choose to purchase from us. If you're located in Melbourne and its surrounding areas, you can collect your order from our Thomastown Showroom at 170 Settlement Road. Otherwise, we can facilitate delivery by leveraging our strong partnerships with various sub-contractors to get you the most competitive delivery rate and suitable time frame. For more information, get in touch with us.

Why Choose Us

Get Your Timber Packed

We pack, wrap and load your products into your vehicle on-site. As a Green Hill customer, you won’t have to pack your timber or lug it into your vehicle after you’ve purchased it.

One Stop Shop

We are a one-stop shop for all your timber needs. Get dozens of types of wood, both imported and local, and the right cuts for your decking, flooring, cladding and fencing projects.

Competitive Pricing

In most cases, we can help you save hundreds or even thousands of dollars on the same materials compared to other timber suppliers.

Expert Staff

Our expert staff will assist you in finding the perfect timber to match your projects based on a relaxed chat to find what you need.

Transparent Quotes

We give you the whole picture when we quote you. So you can avoid any nasty surprises down the line.