Kwila / Merbau Riser

18mm Timber Stair Riser

Complete your staircase with our 18mm thick solid timber stair riser, crafted for a secure fit and stability in closed-style Queensland homes.

Dimensions & Profile:

• Thickness: 18mm (Finished at 17.5mm to fit into tread groove)
• Rise: 170mm, 175mm, 180mm, 185mm or 190mm option (all sizes are 10mm larger to allow for 10mm groove into under side of 30mm treads)
• Drilled: 4mm Clearance holes to be screwed into back of treads

This riser is designed for closed housed stairs (traditional enclosed designs with visible strings) and closed sawtooth stairs (cut stringer styles with invisible strings). It fits perfectly into the 20mm deep riser groove on our 30mm standard treads, ensuring a clean, gap-free assembly for safe and sturdy steps.

Perfect for both new builds and renovations, the 18mm construction provides reliable support and a subtle, integrated look that complements contemporary, coastal, or traditional designs.

Key Benefits:

• Easy installation with precise dimensions for quick groove fitting
• 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.