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A species known for its durability

Punch resistant
From managed forest
All you need to know
  • 1 smooth side - 1 grooved side
  • Straight grain, slight cross grain
  • Yellow-brown shade
  • Sustainable
  • Screw-on

Bangkirai, an essence with a successful track record

Bangkirai, or Yellow Balau is a tree species coming from Indonesian forests. We have been importing it for several decades for outdoor use, as it is abundant and naturally very sustainable.

The majority of our timber comes specifically from an FSC-certified forest concession located in the north-east of the island of Borneo. The timber is quality controlled, cut and dried on the island of Java according to Felixwood's quality requirements.

This durable species has good characteristics for all outdoor wood designs and especially, for deck boards. It is dense and shock resistant. In order to control stability as much as possible, we dry all our boards artificially before planing them.  This results in a better-quality product and limits deformation to a minimum.

The colours of Bangkirai vary according to the wood, it comes in various shades from pink to pinkish brown. The wood can sometimes show a few scattered dead punctures, the size of a pinhead. This peculiarity, hardly visible when the number of punctures remains moderate, is peculiar of Bangkirai and cannot be considered as a defect.

FelixWood Profiles
  • Smooth : 19x90, 21x145, 25x120, 25x145, 27x145, 27x190, 45x145 mm
  • Grooved : 21x145, 25x145, 27x145 mm
  • Reeded : 19x90, 25x145 mm


Tangential Shrinkage
Fungal resistance
Shorea laevis
Radial Shrinkage
Durabilité termites
Yellow brown
RT/RR Ratio
910 kg/m3
Cross grain
Slight cross grain
Moderately stable
Elastic modulus
22940 Mpa
decking joist

Installation of the joists

Plan a centre-to-centre distance of 40 and 50cm between joists. This distance is specified for each of our profiles in the attached table.

The joists must be laid with a slope of 2% in the longitudinal direction of the boards to allow rainwater to run off. This 2% slope must be strictly observed!

Water must also be able to flow under the structure. The joists must be supported on rubber pedestals or supports.

Protect your joists and increase their lifespan: Use the Bitudeck bitumen strip to cover the joists and prevent water infiltration at the fastening points.

Double joisted and cross joisted

Double joisting allows for water to flow between board extremities. Distance between board extremities must be between 4 and 6 mm and distance between the end of the boards and the joist must be between 20 and 30 mm.

Cross joisting

For a faster and longer lasting installation, we recommend cross joisting.

A layer of joists is fixed perpendicularly on a first layer of rafters. The flatness of the deck is easier and quicker to adjust, and ventilation is improved.

In the case of loose and poorly stabilised soil, we recommend the use of galvanised steel foundation screws to ensure effective and durable anchoring of your deck.

Fixing the boards to the wooden joists

Spacing between the decking boards should be kept between 5 and 7mm (taking into account a wood moisture content of 14-16% at delivery). Use board spacers during installation.

Humidity of the boards from 12 to 17% from 18 to 22% > 23% at  H > PSF
Thickness of the spacer shim                                 8 or 7 mm                              5 or 4 mm                          3 or 2 mm                          

To avoid water being trapped between the boards and the joists, we recommend the use of a ventilation wedge of the Airspacer type. Air circulation under the boards prevents any moisture settling.

Ensure good ventilation of the boards

Never completely close the skirts of the deck to "let the air circulate". Leave a ventilation space of 2 cm between floor and skirting. The minimum space between the decking boards and the ground should be 4 cm to 10 cm for damp floors.

Screw-mounting boards to aluminium joists.

Two stainless steel screws are required per fixation point. Use metallic self drilling screws. The board must be pre-drilled with the same drill bit diameter or even slightly larger than the screw diameter + countersink. The upper bare side of the countersunk screw must be slightly smaller than the upper side of the board (2mm).

The distance between the edges of the board is 1.5 to 2 cm. Always fix the ends of the boards less than 5 cm from the edge.

To limit noise pollution and reduce shearing effect on the screws due to aluminium expansion, we recommend applying a 5mm thick Shore 15 EPDM tape to the joists.

All FelixWood woods comply with the European Union Forest Law Enforcement, Governance and Trade Regulation (EU FLEGT). We scrupulously check the certificates of origin of the forest plots. All stages of production, from tree to shipment of the wood are traced and identified. We ensure continuous audit of all our suppliers in accordance with EU FLEGT. As such, 100% of our timber is of legal origin.

But beyond that, we are significantly increasing the proportion of our FSC-certified wood every year.

FelixWood shares FSC® values as described in the "Policy for Association of Organisations with FSC" (FSC-POL-01-004, July 2009).

When buying FSC-certified FelixWood timber, you can be sure you are helping the local population taking care of its forest, ensuring its subsistence and its regeneration according to strict legal rules. For more information click here.

wooden decking maintenance

Maintenance of BANGKIRAI boards

Wood turns grey and the surface cracks due to the weather. We recommend oiling the surface, thereby reducing these effects. Only use non water-based non film-forming oils.

Caution: check in advance whether the oil is suitable for the type of wood used. Application of the oil is necessary at least once a year or even several times, depending on location and weather conditions.

After the winter, clean your decking against moss, which represents an increased slippery risk. Never clean with a high-pressure jet.

CAUTION : The appearance of black spots is quite common. These spots, grey or black, spike shaped, are often mistakenly confused with mould.  This is a fine metal particles oxidation reaction on the surface of the wood. They can come from a variety of sources (lawn fertilizer, plaster and cement, metal dust from cutting work, etc.). This phenomenon can occur suddenly, after moisture deposit on the deck (dew, rain, etc.).

If this happens, see the information sheet: iron oxide / oxalic acid reaction.

Technical documents

  • Bangkirai Data-sheet.pdf
Tropical hardwood decking

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