Balau Timber Singapore — Complete Guide to Properties, Applications and Pricing

Plony Industries

Aug 14

11 min read

Balau is Singapore's most widely used structural hardwood timber — and for good reason. It combines the high density, strength and natural durability that construction, marine and outdoor applications demand, with greater availability and a more accessible price point than Chengal. For contractors, builders and project teams in Singapore who need a timber that performs in demanding outdoor and structural conditions without Chengal's premium price, Balau is almost always the answer.

This guide covers everything you need to know about Balau timber in Singapore — its technical properties, appearance, where it performs best, how it compares to Chengal, what treatment is recommended, what it costs and where to buy it.

What Is Balau Timber?

Balau is a genus of tropical hardwood (Shorea spp., Heavy Hardwood group) native to Malaysia, Indonesia and the Philippines, belonging to the Dipterocarpaceae family — the same botanical family as Chengal and Kapur. Multiple species are commercially sold under the Balau name in Singapore, most commonly Yellow Balau (Shorea faguetiana) and Red Balau (Shorea resinosa). The timber is also known as Bangkirai in Indonesia and Selangan Batu in parts of Malaysia.

Balau heartwood is yellow to medium brown when freshly cut, deepening to a rich dark brown on prolonged outdoor exposure. The grain is moderately fine to coarse and typically interlocked — producing a subtle stripe figure on quartersawn faces. Resin pockets may be present in some pieces. Yellow Balau is lighter in colour with a more consistent appearance; Red Balau is darker with a more pronounced reddish-brown tone.

In Singapore's construction, marine and infrastructure sectors, Balau has been the standard structural hardwood specification for heavy construction, decking and marine fabrication for decades. It is routinely specified by contractors, engineers and project teams alongside or in place of Chengal, depending on performance requirements and budget.

Balau Timber — Full Technical Specifications

The table below covers all key technical properties of Balau timber relevant to specifiers, contractors and buyers in Singapore:

Property	Balau Specification
Scientific name / genus	Shorea spp. (Heavy Hardwood group) — includes Yellow Balau (Shorea faguetiana), Red Balau (Shorea resinosa) and related species
Common names	Balau, Yellow Balau, Red Balau, Bangkirai (Indonesia), Selangan Batu (Malaysia)
Origin	Malaysia, Indonesia and the Philippines — Dipterocarpaceae family, same as Chengal and Kapur
Density (air dry)	800–1,100 kg/m³ — one of the heaviest and densest tropical hardwoods commercially available in Singapore
Durability Class	Class 1–2 under BS EN 350 — very high natural durability. Naturally resistant to decay and insects. Preservative treatment recommended for prolonged outdoor and ground-contact exposure.
Colour	Yellow to medium brown heartwood — deepens to rich brown on prolonged outdoor exposure. Distinct from the paler sapwood. Yellow Balau is lighter in colour; Red Balau has a more reddish-brown tone.
Grain	Moderately fine to coarse texture; typically interlocked grain producing a stripe figure on quartersawn faces. Resin pockets may be present — resin can build up on cutting equipment.
Janka hardness	Approximately 13,600–14,400 N — comparable to Chengal. Significantly harder than Kapur and Keruing.
Bending strength (MOR)	Approximately 130–160 MPa — high structural strength suitable for load-bearing beams and structural members
Silica content	Variable — some Balau species contain small levels of silica which can have a blunting effect on cutting tools. Pre-drilling is advisable before nailing.
Outdoor service life (untreated)	7–15 years in Singapore's outdoor tropical conditions depending on exposure. Class 1 species may last longer; Class 2 shorter.
Outdoor service life (CCA treated)	15–25+ years with LONZA TANALITH CCA preservative treatment — strongly recommended for outdoor and marine applications
Workability	Moderately difficult due to high density and interlocked grain. Blunts cutting tools — use sharp carbide-tipped blades. Pre-drill before nailing. Gluing results are variable — use appropriate adhesive for dense hardwood.
Standard sizes (Singapore)	Cross-sections: 25×25mm to 200×200mm \| Lengths: 1m to 6m \| Custom cut-to-size available

Sources: WoodSolutions Australia timber species database, Malaysian Timber Industry Board (MTIB), BS EN 350 durability classification.

Yellow Balau vs Red Balau — What Is the Difference?

In Singapore's timber market, Balau is most commonly supplied as Yellow Balau — the lighter-coloured, more widely available commercial grade. Red Balau typically has a more consistent reddish-brown colour. For structural applications, both perform equivalently — the choice is often based on colour preference for visible applications such as outdoor decking. Key differences:

• Yellow Balau — lighter yellow-brown colour; more commonly stocked in Singapore; widely used for structural, decking and marine applications

• Red Balau — richer reddish-brown colour; preferred for visible outdoor decking applications where a warmer tone is desired

• For structural, hidden or treated applications — Yellow or Red Balau perform equivalently and the distinction is irrelevant

When ordering from Plony Industries, advise your preference if colour consistency is important for your application. For structural use, we supply the most readily available grade.

Balau vs Chengal — Which Should You Choose?

The most common specification decision in Singapore is between Balau and Chengal. Both are Class 1–2 tropical hardwoods with high natural durability — but they serve different positions in the market. Here is a direct comparison:

Factor	Balau	Chengal
Durability Class	Class 1–2 — very high natural durability	Class 1 — highest natural durability
Density (kg/m³)	800–1,100 — very dense	770–1,050 — similarly dense
Natural outdoor resistance (untreated)	Very good — suitable for outdoor use without treatment. CCA treatment strongly recommended for extended outdoor life.	Excellent — can be used outdoors without treatment. Treatment optional to extend service life further.
Outdoor lifespan (untreated)	7–15 years	15–25+ years
Outdoor lifespan (CCA treated)	15–25+ years with treatment	25–40+ years with treatment
Marine suitability	Very good — widely used in marine fabrication and boat building	Excellent — preferred for highest-grade marine and waterfront structures
Structural strength	Excellent — very high density; preferred for heavy structural beams and load-bearing members	Excellent — comparable structural strength
Silica content	Variable — some species contain silica; blunts cutting tools	No silica — resinous but no silica content
Availability in Singapore	More widely available — broader supply in Singapore market	More limited — premium, slower growing species
Cost	$$$	$$$$
Best for	Heavy structural construction, boat building, outdoor decking and marine use where budget is a key consideration. Excellent value for outdoor performance.	Premium outdoor decking, bridges, long-life marine structures and applications where absolute maximum natural durability is specified.

When to Specify Balau Over Chengal

• Heavy structural construction where maximum load-bearing strength is the primary requirement — Balau's density range at the upper end matches or exceeds Chengal

• Boat building and marine fabrication — Balau is the traditional and well-proven specification for vessel construction in the region

• Budget-sensitive outdoor projects where CCA-treated Balau provides sufficient outdoor performance at lower cost than Chengal

• Projects where wider availability and faster supply are important — Balau is more readily available in Singapore than Chengal

• Infrastructure and public works projects where the specification calls for a Class 1–2 hardwood rather than specifically Chengal

When Chengal Is the Better Choice

• Premium outdoor decking where maximum natural service life without treatment is specified

• Long-life marine structures where absolute highest natural durability to moisture and organisms is critical

• Projects where Durability Class 1 is specifically required by the engineering specification

• Applications where replacing or maintaining the timber after installation is difficult or costly

For a full comparison of all five hardwood species available in Singapore including Kapur, Keruing and Khaya, see: Balau vs Chengal vs Kapur vs Keruing vs Khaya — Which Hardwood Timber Should You Choose?

Balau Timber Applications in Singapore

Application	Balau Suitability	Why
Heavy structural construction and beams	Excellent ✅	Very high density (800–1,100 kg/m³) and bending strength ~130–160 MPa. One of the strongest structural hardwoods available in Singapore.
Outdoor decking and walkways	Excellent ✅	High natural durability; CCA treatment recommended for outdoor use. Widely used for residential, commercial and public decking in Singapore.
Boat building and marine frames	Excellent ✅	Traditional specification for boat building in Southeast Asia. High density and strength with good marine moisture resistance.
Bridges and infrastructure	Excellent ✅	High load-bearing capacity and outdoor durability for long-service-life structural applications. LTA and infrastructure project specified species.
Marine and waterfront structures	Very good ✅	Good marine moisture resistance. CCA treatment recommended for immersed or splash zone applications.
Flooring and industrial flooring	Good ✅	High hardness and density make Balau extremely wear-resistant for high-traffic flooring applications including vehicular workshop floors.
Formwork and shuttering	Over-specified ⚠️	Balau's strength and durability are not required for temporary formwork. Use Kapur or Keruing for more cost-effective formwork applications.
Interior furniture and cabinetry	Over-specified ⚠️	Balau's weight and hardness make it difficult to work with for fine furniture. Use Khaya (African Mahogany) for interior decorative work.

Does Balau Need Chemical Treatment?

Balau is naturally durable at Durability Class 1–2 — it can be used outdoors without treatment, but chemical treatment significantly extends service life and is strongly recommended for most outdoor applications in Singapore.

When Treatment Is Recommended

• Outdoor decking and walkways — CCA preservative treatment extends service life from 7–15 years untreated to 15–25+ years treated. Strongly recommended for all outdoor decking applications in Singapore's humid climate.

• Marine and waterfront structures — Balau in splash zones, tidal areas and immersed conditions benefits significantly from CCA treatment to maximise service life.

• Ground contact applications — any Balau in direct ground contact requires pressure treatment. Untreated Balau should not be used in ground contact.

• Structural applications with SCDF fire safety requirements — DRICON fire retardant treatment is available for commercial, institutional and high-rise applications where SCDF fire codes require fire-rated timber.

When Untreated Balau Is Acceptable

• Interior structural applications — Balau used in dry interior conditions does not require chemical treatment

• Temporary structures and formwork — short-life applications do not justify the cost of treatment (though Kapur or Keruing would be more cost-effective for formwork)

• Applications where the project specification calls for untreated timber and relies on natural durability

Plony Industries is an authorised LONZA chemical treatment provider — both TANALITH CCA preservative treatment and DRICON fire retardant treatment are available at our in-house facility at TimMac@Kranji. CNC cut Balau components can also be treated after cutting.

Working with Balau Timber — Practical Notes

Cutting and Machining

Balau's high density and interlocked grain mean it blunts cutting tools faster than softer species. Use sharp carbide-tipped blades and replace or sharpen them regularly. Some Balau species contain small amounts of silica which accelerates tool wear — keep blades sharp and reduce feed speed when machining.

Resin pockets in some pieces can cause resin build-up on saw blades and router bits — clean blades regularly with solvent. Resin does not affect structural performance.

Nailing and Fastening

Pre-drilling is strongly advisable before nailing Balau — the high density makes driving nails without pre-drilling very difficult and risks splitting the timber, particularly near ends and edges. Use stainless steel or hot-dip galvanised fasteners for all outdoor applications — mild steel corrodes rapidly in Singapore's outdoor humidity and creates staining in the timber.

Gluing

Gluing results with Balau are variable — the dense grain structure and potential resin content can interfere with adhesive bonds. For structural gluing applications, clean mating surfaces with solvent before applying adhesive, use an adhesive system suitable for dense hardwood, and follow the manufacturer's clamping and cure time recommendations. Consult your adhesive supplier for structural gluing requirements.

Finishing and Coating

Balau accepts stains, oils and varnishes well — better than Chengal due to lower resin content in most species. For outdoor decking, a penetrating hardwood oil applied annually maintains the natural brown colour and slows the weathering to silver-grey. For a natural weathered look, Balau can be left uncoated — it weathers to a consistent silver-grey over time, similar to other tropical hardwoods.

Balau Timber Price in Singapore — What to Expect

Balau is priced below Chengal but above Kapur and Keruing — positioning it as the premium-value structural hardwood in Singapore's market. It offers performance approaching Chengal at a meaningfully lower cost, making it the most widely specified structural hardwood in Singapore across construction, marine and infrastructure projects.

Pricing is influenced by:

• Cross-section and length — larger sections and custom cut-to-size carry higher unit costs

• Treatment — untreated Balau is lower cost; CCA or fire retardant treatment adds cost but is typically included in the lifetime cost analysis

• Surface finish — sawn (rough) is most economical; planed smooth adds cost but is necessary for decking and visible members

• Quantity — larger project orders typically attract better pricing

Contact Plony Industries for current Balau timber pricing in Singapore — call 6366 5855 or email cs@plonyindustries.com with your cross-section, length, quantity and treatment requirements.

Frequently Asked Questions — Balau Timber Singapore

What is Balau timber?

Balau is a tropical hardwood from the Shorea genus (Dipterocarpaceae family) native to Malaysia, Indonesia and the Philippines. It is one of the most widely used structural hardwoods in Singapore, valued for its high density (800–1,100 kg/m³), natural durability (Class 1–2) and load-bearing strength. It is available as sawn timber in standard and custom dimensions for construction, marine and outdoor applications.

What is the durability class of Balau timber?

Balau is rated Durability Class 1–2 under BS EN 350 — very high natural durability. It has good natural resistance to decay and insects, making it suitable for outdoor use. Chemical treatment (LONZA TANALITH CCA) is strongly recommended for extended outdoor service life in Singapore's tropical climate.

What is the difference between Balau and Chengal timber?

Both are premium tropical hardwoods with high natural durability, but Chengal (Class 1) has higher natural durability and longer outdoor service life than Balau (Class 1–2). Balau is more widely available and costs 20–35% less than Chengal. Balau is the preferred specification for heavy structural construction and boat building; Chengal is preferred for premium outdoor decking and long-life applications where maximum natural durability is specified.

Does Balau timber need chemical treatment in Singapore?

Balau can be used outdoors without treatment but CCA treatment is strongly recommended for all outdoor, marine and exposed applications. Treated Balau extends from 7–15 years untreated to 15–25+ years with LONZA TANALITH CCA treatment. Ground contact applications require pressure treatment regardless of species.

What sizes of Balau timber are available in Singapore?

Plony Industries supplies Balau sawn timber in cross-sections from 25×25mm to 200×200mm and lengths from 1m to 6m. Cut-to-size and custom dimensions are available through our in-house cutting facility at TimMac@Kranji. Planed finish and chemical treatment are also available.

Is Balau suitable for outdoor decking in Singapore?

Yes — Balau is one of the most widely used outdoor decking timbers in Singapore. With CCA preservative treatment, it provides 15–25 years of outdoor service life. It weathers to a rich dark brown over time outdoors, or can be maintained with hardwood oil for a more consistent colour. Yellow Balau is the most commonly used grade for decking.

What is Yellow Balau?

Yellow Balau (Shorea faguetiana) is the most widely available Balau species in Singapore — lighter in colour with a yellow-brown heartwood that deepens on exposure. It is the standard commercial grade of Balau for structural, decking and marine applications. Red Balau has a richer reddish-brown colour. For structural and treated applications, both perform equivalently.

Where can I buy Balau timber in Singapore?

Plony Industries supplies Balau sawn timber in Singapore from our facility at TimMac@Kranji. We stock standard dimensions with cut-to-size, planing and chemical treatment available. Contact us at 6366 5855 or cs@plonyindustries.com for current stock, pricing and availability.

Buy Balau Timber in Singapore — Plony Industries

Plony Industries stocks Balau sawn timber in Singapore in standard and custom dimensions. As a timber supplier since 1984 with an authorised LONZA treatment facility at TimMac@Kranji, we supply Balau for structural construction, marine fabrication, outdoor decking, bridges and all other applications requiring a high-strength, naturally durable tropical hardwood.

• Yellow Balau and Red Balau sawn timber — standard cross-sections 25×25mm to 200×200mm, lengths 1m to 6m

• Cut-to-size and custom dimensions available in-house

• Planed smooth finish for decking and flooring applications

• LONZA TANALITH CCA treatment and DRICON fire retardant treatment available

• Island-wide delivery across Singapore

Contact Us: +65 6366 5855 | cs@plonyindustries.com

Hardwood Timber Page: www.plonyindustries.com/hardwood-timber