Kwila / Merbau Open House Tread

40mm Open Timber Stair Tread

Elevate your staircase with our precision-machined 40mm thick solid timber stair tread, expertly crafted for durability, comfort, and a seamless fit in open-style stairs.

Dimensions & Profile:

• Thickness: 40mm (finished at 39.5mm to fit nicely into strings)
• Going: 240mm or 250mm
• Total width: 260mm or 270mm (includes a 20mm overhang/nosing for a classic, elegant projection that enhances safety and aesthetics)
• Front and Back Edges: Attractive 6mm pencil round nose profile on both – subtle, smooth rounded edges that provide a refined look, reduce sharp corners, and ensure a balanced, open aesthetic

This tread is versatile and suitable for open housed stairs and open sawtooth stairs. Manufactured without a riser groove for open configurations where risers are not used and stub risers are used to meet regulation – See Stub Risers.

Perfect for both new builds and renovations, the 40mm thick construction ensures long-lasting performance in family homes, while the pencil round edges and overhang create a timeless, sophisticated finish that complements contemporary, coastal, or traditional designs.

Key Benefits:

• Streamlined installation for open stair systems
• Smooth, sanded surfaces ready for your choice of stain, oil, or clear finish
• Naturally beautiful grain and tones that add warmth and character

Available in both 1m and 1.5m lengths to suit your project. All products are delivered raw, pre-finished sanded to 100 grit.

Kwila (also called Merbau) is a tough Australian and Southeast Asian hardwood that brings rich, warm colour to stair work. Freshly cut it shows golden to orange-brown tones that deepen over time into a handsome reddish-brown, often with small yellow flecks scattered through the timber. The grain is usually straight to interlocked with a moderately coarse but even texture, giving a clean, solid look once finished. Dense, hard and highly durable, Kwila stands up well in high-traffic areas and is a reliable choice for treads, risers, stringers, handrails and balustrades. It’s the go to choice for affordable external timbers as it naturally deters termites and is less susceptible to water ingress.