Spotted Gum Decking 140 x 19mm x 2.7m
Spotted Gum Decking 140 x 19mm x 2.7m is kiln-dried Merbau (Intsia bijuga) hardwood decking with a Janka rating of 8.6 kN and AS 5604 Durability Class 1 — engineered to outlast softwood alternatives by decades in Melbourne's variable climate. Pre-oiled finish reduces on-site preparation. Available at BuildBarn Hallam — 24–48 h Melbourne Metro delivery.
$39.15
Add to cartFrequently Asked Questions — Decking
Merbau is a premium tropical hardwood prized for its rich reddish-brown colour, natural hardness (Janka ~8.5 kN), and built-in termite resistance — a classic choice for Melbourne outdoor decks. However, it requires annual oiling to prevent greying and surface cracking under Melbourne's intense UV and wet winters. Composite decking (WPC) is an engineered board made from wood fibre and recycled polymer. It is splinter-free, fade-resistant, and needs no staining or sealing — just an occasional wash. While Merbau delivers a warmer, authentic timber look, composite decking wins on long-term cost of ownership and is increasingly the preferred choice for Melbourne homeowners who want a premium outdoor space without the ongoing maintenance. BuildBarn stocks both — our team can help you choose based on your budget, lifestyle, and aesthetic goals.
Melbourne's climate — with scorching 40°C+ summers, high UV exposure, and wet winters — is particularly demanding on outdoor timber. Treated pine decking should be sanded and re-stained every 1–2 years to prevent splintering and moisture damage. Merbau hardwood requires oiling at least once a year to maintain its colour and prevent surface cracking. Composite (WPC) decking, by contrast, requires no staining, sealing, or sanding — a simple wash with mild soapy water once or twice a year is all that's needed. For Melbourne homeowners, composite decking offers the best long-term performance with minimal upkeep.
In Victoria, a building permit is generally required for any deck that is more than 800 mm above ground level, or exceeds 10 m² in area. For smaller, ground-level decks below these thresholds, a permit may not be required — but you should always confirm with your local council (e.g., City of Casey, Knox, or Greater Dandenong). BuildBarn can advise on appropriate structural timber sizes and grades that comply with the National Construction Code (NCC) and AS 1684. When in doubt, consulting a registered building surveyor is always the safest approach.
BuildBarn delivers to most Melbourne metropolitan suburbs within 24–48 hours. For outer Melbourne and regional Victoria, delivery typically takes 2–3 business days. We hold extensive stock of treated pine, Merbau, composite decking, and WPC cladding at our Hallam warehouse (3 Eastlink Drive), so same-day dispatch is available for in-stock items ordered before midday. Trade account holders receive priority scheduling and volume pricing — contact us to arrange a trade account today.
For standard residential decks with joist spacing at 450 mm centres, 90×19 mm decking boards are the most common and cost-effective choice. If your joists are spaced at 600 mm centres, upgrade to 140×19 mm boards for better rigidity and a premium aesthetic. For high-traffic decks, commercial applications, or longer spans, 25 mm-thick boards provide superior strength and reduced flex underfoot. Our team at BuildBarn's Hallam store can help you calculate the correct board size based on your frame design, load requirements, and budget.
Once the deck is no longer just a surface-material comparison and the customer is deciding joists, bearers, board spacing, or fixing method, the project has moved into a more structured install path. That is usually the point where framing logic, calculator use, and quote planning should be reviewed together rather than as separate decisions.
Those scenarios usually push customers to compare more than appearance alone. Moisture, maintenance expectations, install path, and long-term use all become more important, so the shortlist should stay focused on the environment the deck will actually live in before the quote is finalised.
Often yes. When the site is tighter or material access is more difficult, board length, delivery handling, framing practicality, and the broader quote path can all matter earlier. Those jobs benefit from planning access alongside the material path instead of leaving it to the end.