Bangkirai Decking in Bali: The Ultimate Guide to Choosing the Right Tropical Hardwood

What Is Bangkirai Wood?

Bangkirai (Shorea laevis) is a Southeast Asian tropical hardwood, also known as Yellow Balau in international markets. It grows primarily in Kalimantan, Sumatra, and Malaysia.

It belongs to the Shorea family — the same family that includes some of the world's most durable construction hardwoods.

Key Technical Specs

PropertyBangkiraiJanka Hardness~1,925 lbfDensity870–1,100 kg/m³Durability ClassClass 1–2 (Very Durable)Natural Oil ContentHighColor (fresh)Yellow-brownColor (aged)Silver-grey patina

Bottom line: Bangkirai is approximately 2x harder than most softwoods and outperforms many tropical species in outdoor environments.

Why Bangkirai Is Bali's Go-To Decking Wood

Bali's climate is unforgiving for wood. You're dealing with:

• 90%+ humidity during rainy season

• UV radiation year-round

• Salt air in coastal areas

• Termites and insects at every elevation

Bangkirai handles all of it — naturally, without chemical treatment.

✅ 5 Reasons Architects & Builders Choose Bangkirai

1. Exceptional Hardness Its tight grain and high density make it naturally resistant to denting, scratching, and heavy foot traffic. Perfect for pool decks, terraces, and high-traffic hospitality areas.

2. Natural Weather Resistance Bangkirai contains natural resins that resist moisture absorption. Unlike softer woods, it won't warp or crack with Bali's wet-dry cycles.

3. Termite & Insect Resistance Its dense cellular structure makes it extremely difficult for termites to penetrate — a critical advantage in Bali's tropical environment.

4. Longevity Properly installed Bangkirai decking can last 25 to 40 years with minimal maintenance. That's decades of ROI on your investment.

5. Aesthetic Versatility Fresh Bangkirai has a warm golden-yellow tone. Left untreated, it weathers to a sophisticated silver-grey — a look that's trending hard in contemporary Bali villa design right now.

Reclaimed vs. New Bangkirai: Which Should You Choose?

This is the question every builder asks us.

New Bangkirai

• Consistent color and dimensions

• Easier to source in large quantities

• Slightly higher moisture content on delivery

• Great for standardised, large-scale projects

Reclaimed Bangkirai

• Naturally pre-dried and pre-aged over decades

• Denser grain = superior structural stability

• Unique aesthetic: no two boards are identical

• Eco-responsible: zero new deforestation

• Slightly more variable in dimensions — needs expert grading

📉 According to the WWF, reusing 1m³ of timber can prevent up to 1.1 tonnes of CO₂ emissions. Choosing reclaimed Bangkirai isn't just a design choice — it's a climate decision.

Our recommendation at Kitaru? If your project allows for it, reclaimed Bangkirai is almost always the smarter long-term choice — in durability, sustainability, and character.

Bangkirai Decking vs. Other Hardwoods: A Head-to-Head Comparison

FeatureBangkiraiTeakUlin (Ironwood)CompositeHardness★★★★☆★★★★☆★★★★★★★☆☆☆Natural OilHighVery HighHighNoneLifespan25–40 yrs30–50 yrs50–75 yrs10–20 yrsPrice✅ Affordable💰 Premium💰💰 Very Premium💲 CheapEco Option✅ Reclaimed✅ Reclaimed✅ Reclaimed❌ SyntheticAesthetics★★★★☆★★★★★★★★★☆★★★☆☆

The verdict? Bangkirai hits the sweet spot between performance, cost, and sustainability. It outperforms composite materials on every metric that matters, at a fraction of the price of teak or ironwood.

How to Install Bangkirai Decking: 5 Key Best Practices

Getting the installation right is just as important as choosing the right wood. Here's what your contractor needs to know:

1. Acclimatize before installation Let the boards sit on-site for at least 48–72 hours before fixing. This allows the wood to adjust to local humidity and reduces post-installation movement.

2. Use stainless steel or coated screws Standard steel screws will rust and stain Bangkirai. Always use stainless steel or coated deck screws — the tannins in tropical hardwoods accelerate corrosion.

3. Pre-drill pilot holes Bangkirai is dense. Pre-drilling prevents splitting, especially near board edges. Drill at least 2.5 cm from the edge of each board.

4. Leave expansion gaps Allow 3–5 mm gaps between boards for ventilation and drainage. This prevents moisture retention and board warping in Bali's rainy season.

5. Apply an oil finish (optional but recommended) If you want to preserve the golden colour, apply a UV-resistant decking oil every 12–18 months. If you prefer the natural silver-grey weathered look, simply leave it untreated and let nature do its work.

How to Identify Quality Bangkirai at the Lumberyard

Not all Bangkirai is equal. Here's what to look for when sourcing your boards:

• Grain density: Tight, even grain = higher quality and durability

• Color uniformity: Natural variation is expected — excessive blue/black staining signals poor drying

• No surface cracking: Minor end checks are acceptable; deep surface cracks are a red flag

• Weight: Quality Bangkirai is heavy. If a board feels light, it may have been poorly dried or mis-graded

• Documentation: Always ask for origin documentation — especially for reclaimed material. Legal sourcing from East Kalimantan or Java should be fully traceable

At Kitaru, every batch of reclaimed Bangkirai comes with verified origin documentation. No guesswork. No greenwashing. Just genuine sustainable hardwood.

Common Questions About Bangkirai Decking

Does Bangkirai need to be treated?

No chemical treatment is required for structural durability. An oil finish is optional if you want to maintain its golden color.

Is Bangkirai slippery when wet?

When planed smooth, it can be. Request grooved or brushed boards for poolside or wet-area applications — the textured surface dramatically improves grip.

How does Bangkirai compare to composite decking?

Composite may seem easier but it degrades under intense UV, can't be refinished, and ends up in landfill. Bangkirai lasts 2–3x longer and is fully natural and biodegradable.

Can Bangkirai be used for indoor flooring?

Yes — though it's primarily used outdoors. Its density and hardness make it suitable for high-traffic interior flooring too, with the right finish.

Where to Source Reclaimed Bangkirai in Bali

You have two choices: generic suppliers who can't tell you where the wood came from — or a trusted lumberyard that gives you full traceability, expert grading, and the right hardware to go with it.

At Kitaru Lumberyard Bali, we specialise in sourcing and preparing the highest-quality reclaimed Bangkirai for decking, flooring, cladding, and structural applications across Bali and beyond.

• 📍 Visit our showroom: Jl. Pantai Saba No.47509, Saba, Blahbatuh, Gianyar, Bali 80581

• 🕘 Open: Mon–Fri 8:30AM–4:30PM | Sat 8:30AM–12PM

• 📞 WhatsApp us: +62 0853 3375 1696

• 🌐 www.kitaru-lumberyard-bali.com

The Bottom Line

Bangkirai is not a compromise. It's a deliberate choice made by experienced architects, builders, and eco-conscious homeowners who know what performs in Bali's tropical climate.

Hard. Durable. Beautiful. Sustainable — when sourced right.

If you're starting a decking project and want honest advice on species, dimensions, and quantities — come talk to our team. We'll help you get it right from the start.

👉 Contact Kitaru — Get a Free Quote for Your Decking Project