Red Balau, also known as Bangkirai, is a premium tropical hardwood sourced from Southeast Asia (Malaysia, Indonesia, Philippines). With a Janka hardness rating of 1,580 lbf and a density of 59 lbs/ft³, Red Balau is classified as Class 2 - Durable — one of the most durable commercial lumber species available. The heartwood exhibits light to medium red-brown with interlocked grain, moderately coarse texture, creating a striking natural appearance that improves with age.
Why Choose 5/4x6 Red Balau Wood for Your Siding?
As exterior cladding, Red Balau siding provides a weather-tight barrier with exceptional impact resistance. The dense grain resists dents, hail damage, and woodpecker damage far better than cedar, pine, or fiber cement alternatives. Properly installed 5/4x6 Red Balau siding delivers a service life of 40+ years with minimal maintenance — an optional annual oil treatment preserves the original color, or you can let the Red Balau wood weather to a distinguished silver-gray patina. Red Balau carries a Class A - Low flame spread, making it suitable for wildfire-prone regions where code-compliant materials are required.
The 5/4x6 rainscreen profile is engineered for open-joint cladding systems with ventilation gaps behind the boards. This modern system manages moisture while creating a striking contemporary facade. All Red Balau lumber is available in Select and Better grade with lengths ranging from 4′ to 20′. For detailed step-by-step instructions, consult our Red Balau installation guide. Long-term care recommendations are covered in our Red Balau maintenance guide.
5/4x6 Red Balau Siding — Installation & Coverage Specs
- Recommended joist spacing: 16"–24" on center for 5/4x6 boards (1" actual thickness)
- Fastener placement: Secure per profile requirements, one fastener per joist minimum
- Board weight: A 12-foot 5/4x6 Red Balau board weighs approximately 27 lbs (2.25 lbs/LF)
- Coverage: Each 12-foot 5/4x6 board covers 5.5 sq ft of siding surface (5.5" face width)
- Pre-drilling required: Always pre-drill in Red Balau — the 1,580 lbf hardness prevents direct screwing
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