What You Need To Know Before Choosing Merbau Decking?

Merbau decking has become one of the most popular choices across Australia, particularly in Melbourne, thanks to its rich appearance, impressive durability, and ability to handle the country’s diverse climate. Whether you’re upgrading an outdoor living area, building a new deck for entertaining, or comparing different timber options, Merbau is a material that deserves attention.

But before you rush into purchasing, there are a few key things you need to know about Merbau decking—its benefits, sizes, costs, maintenance needs, and considerations that will ensure you make the right decision for your project.

In this guide, we’ll walk you through everything you should know before choosing Merbau decking, with a closer look at popular sizes like Merbau decking 140 x 19, Merbau decking 90 x 19, and Merbau decking 70 x 19.

Why Choose Merbau Decking?

Merbau, also known as Kwila, is a hardwood timber native to Southeast Asia and the Pacific region. It has long been a favourite for decking projects because of its:

Durability: Merbau is naturally resistant to termites, decay, and harsh weather conditions. With proper care, it can last decades.
Strength: Its high density and interlocked grain make it less likely to warp or split compared to softer timbers.
Appearance: The deep reddish-brown tones add warmth and a luxurious finish to any outdoor area. Over time, the timber weathers beautifully if oiled regularly.
Sustainability (when sourced right): Many suppliers now stock responsibly harvested Merbau decking, which helps protect tropical forests.

For homeowners in Melbourne, Merbau decking is especially popular because it can withstand both the cold winters and the hot, dry summers without losing its shape or appeal.

Factors to Consider Before Buying Merbau Decking

Before committing to this timber, here are the essential things you should keep in mind:

1. Budget

Merbau decking is not the cheapest option on the market, but its durability often makes it more cost-effective in the long run. Larger board sizes like Merbau decking 140 x 19 usually cost more per linear metre than Merbau decking 90 x 19 or Merbau decking 70 x 19, but they can reduce installation time since fewer boards are required.

2. Deck Size and Design

Think about the size of your deck and how the board dimensions will affect the look:

Merbau decking 140 x 19 – wider boards create a modern, sleek look with fewer gaps.
Merbau decking 90 x 19 – the most traditional size, versatile and widely available.
Merbau decking 70 x 19 – narrow boards that are ideal for feature areas, smaller decks, or detailed designs.

Your choice will impact both the aesthetics and the installation process.

3. Maintenance Commitment

Merbau is a hardwood that requires regular oiling and sealing to maintain its rich colour and longevity. In Melbourne’s climate, this usually means oiling every 6–12 months. If you prefer low-maintenance materials, you may want to consider alternatives like composite decking.

4. Sustainability and Sourcing

Due to overharvesting in the past, Merbau has sometimes been linked to unsustainable forestry practices. Always check that your supplier offers certified Merbau decking from legal and responsible sources. In Melbourne, many reputable suppliers stock FSC-certified timber.

5. Installation Needs

Merbau is dense and heavy, so it can be more challenging to cut and drill compared to softwoods. Using stainless steel screws and pre-drilling holes will help prevent splitting. If you’re not experienced with timber work, professional installation is highly recommended.

Comparing Popular Merbau Decking Sizes

Choosing the right size of Merbau decking boards can transform the look and feel of your outdoor space. Let’s break down the three most common options:

1. Merbau Decking 140 x 19

Look: Wide and bold, perfect for modern outdoor entertaining areas.
Advantages: Fewer gaps, faster installation, premium aesthetic.
Considerations: Heavier, requires strong subframe support, often more expensive.
Best for: Large decks, pool surrounds, and contemporary designs.

2. Merbau Decking 90 x 19

Look: The classic choice, striking a balance between width and versatility.
Advantages: Readily available, easier to install than wider boards, timeless appearance.
Considerations: Requires more boards compared to 140 mm width, but gives a traditional finish.
Best for: Medium to large decks, patios, and most residential projects.

3. Merbau Decking 70 x 19

Look: Narrow and elegant, offering a more intricate finish.
Advantages: Excellent for detailed patterns, feature areas, and small decks.
Considerations: More time-consuming to install since more boards are needed.
Best for: Courtyards, balconies, pathways, or accenting wider boards.

Merbau Decking in Melbourne: What Makes It Popular

Melbourne’s diverse climate—hot, dry summers followed by cool, damp winters—can be harsh on outdoor timbers. Merbau decking is popular in the region because:

It resists swelling and shrinking better than many other timbers.
It maintains its structural strength even with seasonal changes.
Its warm, reddish tone complements Melbourne’s architectural styles, from modern minimalist homes to Victorian-era terraces.

Local suppliers often stock a wide range of sizes, including Merbau decking 140 x 19, Merbau decking 90 x 19, and Merbau decking 70 x 19, making it easy to match your project’s requirements.

Pros and Cons of Merbau Decking

To give you a clear picture, here’s a balanced view of Merbau decking’s strengths and drawbacks:

Pros:

Long lifespan with proper maintenance.
Natural resistance to pests and decay.
Luxurious, deep colour.
Strong and stable.
Available in multiple sizes and finishes.

Cons:

Needs regular oiling to maintain colour.
Can leach tannins (red-brown pigment) when first installed—important near pools or paving.
More expensive than some other timbers.
Heavy and harder to work with for DIY projects.

Tips for Maintaining Your Merbau Decking

To keep your deck looking beautiful and lasting for decades:

Initial Treatment: Wash and oil the boards before installation to reduce tannin bleeding.
Regular Oiling: Apply decking oil every 6–12 months, depending on sun exposure.
Cleaning: Sweep regularly and wash with a mild detergent to prevent mould and dirt build-up.
Avoid Standing Water: Ensure your deck has proper drainage to prevent water damage.
Furniture Pads: Use protective pads under outdoor furniture to avoid scratches.

Cost of Merbau Decking in Melbourne

Prices vary depending on size and supplier, but here’s a general guide:

Merbau decking 70 x 19 – usually the most affordable per linear metre.
Merbau decking 90 x 19 – mid-range, most cost-effective option for larger projects.
Merbau decking 140 x 19 – premium price point, but faster to install with a bold finish.

When comparing Merbau decking Melbourne prices, factor in not just the timber cost but also installation, oiling products, and maintenance tools.

Is Merbau Decking Right for You?

If you’re after a decking material that’s tough, timeless, and perfect for Melbourne’s climate, Merbau is hard to beat. It requires some commitment to maintenance, but the reward is a stunning deck that can last for decades.

By carefully considering board size—whether you prefer the sleek look of Buy Merbau decking 140 x 19, the traditional charm of Merbau decking 90 x 19, or the detail of Merbau decking 70 x 19—you’ll create an outdoor space that reflects your style and enhances your property’s value.

Final Thoughts

Choosing the right decking is about more than just looks—it’s about durability, maintenance, and suitability for your lifestyle. Merbau timber decking ticks many of the boxes that homeowners in Melbourne are looking for: strength, beauty, and longevity.

Before you make a purchase, weigh the pros and cons, check the sourcing of your timber, and think carefully about which size best fits your project. With the right preparation, you’ll have a deck that not only looks incredible but also stands the test of time.