Yellow Balau (Bangkirai) Decking

£44.42 £37.02 per sqm £44.42 £37.02 per sqm

20% off selected lengths.

Yellow Balau (pronounced Bal-Ow) - Bangkirai - is a very durable hardwood and one of the most popular species in the UK for hardwood decking. It's a hard, heavy and strong timber that is well suited to deck construction.

With a mixture of warm colours of golden browns, light browns and pale reddish-brown, Yellow Balau offers a unique colour range which will sit beautifully within a natural environment.

Please note, orders placed for 1m lengths will be supplied in random board lengths, dependant on stock availability.

Wastage Allowance
Please ensure when ordering that you make an allowance for wastage. We recommend adding an additional 10-15% over and above your initial requirements. If using the coverage calculator within the configure and buy, a wastage allowance of 10% is built-in for your convenience.

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Yellow Balau (Bangkirai) Decking

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A wastage allowance of 10% is built-in for your convenience.

Product Details

  • Size: 21 x 145mm.
  • Grade: Standard & Better.
  • Profile: Yellow Balau deck boards have bevelled edges.
  • Surface texture: Smooth.

Key Properties

  • Appearance: Produced predominantly from the heartwood, Yellow Balau can vary in colour from reddish-brown to a more olive or darker blackish brown. It has an interlocking grain, fine uniform texture and a surface that is almost entirely free of knots and other natural defects. Occasional pinhole and hit and miss is acceptable within the grading rules of Yellow Balau decking.
  • Durability: Yellow Balau has a natural resistance to moisture, decay and insect damage. With a proven life expectancy of 50+ years (when correctly maintained), it has a Durability Class 2 (BS EN 350-2) (durable) rating and is known to be one of the toughest and most durable hardwoods on earth.
  • Stability:  Wood is a hygroscopic organic material that takes up and releases moisture according to the temperature and the relative humidity of the ambient air. As wood releases moisture it will shrink (usually during summer) and as it absorbs moisture (in the winter months) it will expand. The rate of expansion and contraction will vary according to the grain orientation of the wood. This means that some pieces will expand or contract more than others, so there may be minor variances in the width of the boards (known as tangential shrinkage). Shrinkage in the thickness (radial) is minimal and length (longitudinal) virtually non-existent.
  • Density & Hardness: Yellow Balau is the hardest of all commercially available hardwood species; in fact, it’s one of the hardest woods on Earth. It has a Janka scale rating of 3510 lb/in2 (3 times harder than Oak) and weighs in at 960 - 12000 kg/m3 when dry. As a result, it’s highly resistant to impact and abrasion.
  • Grading: Silva's Yellow Balau decking is 'Standard & Better' grade which has excellent characteristics. Its appearance is almost entirely free of knots.
  • Sourcing: Silva's Yellow Balau decking is manufactured in Indonesia from the highest quality wood fibre. Rather than buying on an 'ad-hoc' basis from different suppliers with varying quality standards, we have been buying from a single reputable source for several years to ensure quality and consistency.

Optional Extras

  • Finishes: Even though Yellow Balau is highly durable in its natural state we recommend that Yellow Balau decking be finished on all four sides prior to installation to help prevent surface checking, discolouration and cupping. Choose from a wide range of Sansin Dec paint and stain products.
  • Factory coating service: Can be supplied factory coated, enabling it to be installed at any time of year, regardless of the weather or temperature. Please Contact Us for a quotation.
Size Lengths Linear Metre Square Metre
21 x 145mm 1m / 2.74m / 3.35m / 3.96m £5.55£6.66 £37.02£44.42
21 x 145mm All other lengths £6.94£8.33 £46.29£55.55


Size: 21 x 145mm.

Coverage: 150mm (assuming 5mm gap between boards).

Linear metres per square metre: 6.67.

Grade & Quality

Yellow Balau Grade & Quality Description.

Recommended Fasteners

5.0 x 60mm Countersunk Stainless Steel Screws.

Yellow Balau Certification

The Timber Legality Assurance System (SVLK) assures the legality of timber products imported from Indonesia; in accordance with the Regulation No.995/2010 (Timber Regulation) adopted by the European Union in 2013.

The “Indonesian Legal Wood” certificate provides irrefutable proofs that timber products do not come from illegal sources. All Indonesian timber-related industrial units, primary or secondary will have a legality certificate and are audited independently the National Accreditation Body (Komite Akreditasi Nasional).

Indonesian Legal Wood (SVLK)

In 2009, the Government of Indonesia issued the Minister of Forestry Decree No.P. 38/Menhut-II/2009 on the Standards and Guidelines of Performance Evaluation of Sustainable Forest Management and Timber Verification for Permit Holder or on Private Forest. The new regulation is known as the Timber Legality Assurance System (or SVLK in Indonesian).

This is an Indonesian effort to assure the legality of its timber products, which is in line with the trend of major timber market globally. This is in accordance with the Regulation No.995/2010 (Timber Regulation) adopted by the European Union in 2013.

The “Indonesian Legal Wood” certificate provides irrefutable proofs that timber products do not come from illegal sources. All Indonesian timber-related industrial units, primary or secondary will have a legality certificate and are audited independently by the National Accreditation.

The SVLK (Timber Legality Verification) certificate guarantees that the operator /timber industry has complied with the legality standards and criteria.

SVLK Operations

P. 38/Menhut-­‐II/2009 revised as P68/Menhut-­‐II/2011 stipulates that the forestry business unit must get certified for Sustainable Forest Management (SFM), or at the minimum be certified for legality. Further, all timber-related industrial units, either primary or secondary industry, have to obtain a legality certificate.

Sustainable Forest Management (“PHPL”) or legality assessment or audit is conducted independently assessor/verifier institutions accredited by the National Accreditation Body and are monitored by NGOs or civil society.

By the end of 2011 assessment of SFM to management unit or permit holder operating on various forest management types had been conducted on a total area of around 8.8 million Has.

Timber Legality Verification (VLK) has also been conducted in natural forest and plantation forest covering a total of around 800,000 Ha. The VLK has also been conducted in 216 factories.


Timber delivery charges vary based on the products you have ordered, the location of your delivery, the value of your order and the delivery service you require.

Silva own vehicle delivery – Our cheapest timber delivery service with goods expertly delivered by a member of our team on our own vehicles. Priced at £45 + VAT, orders are typically fulfilled within 7 working days*. Available to selected postcodes only.

Haulier delivery – Our haulier delivery service is for areas not covered by our own vehicles. Lead-times for this service are guaranteed between 5-7 working days, subject to stock availability. Prices start from £95 + VAT.

Saturday deliveries – please call for a quote.

Free delivery is offered on orders over £2,000 + VAT**

You can view our delivery charges and services here.

Please note: As with most building materials, delivery is to the kerbside only.

* Typical lead-time for our Silva own vehicle service is 5-7 days although this is not guaranteed. Please allow up to 14 days for delivery especially at peak times.

** Exclusions apply. See Delivery Information tab for further details.

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