Optimum Onyx Timber 3 Bar Concrete Sleeper

What It Is

Optimum Onyx Timber Rustic 3‑Bar Concrete Sleeper is a premium landscaped sleeper featuring a timber-look onyx finish on high-strength, reinforced concrete. With three N12 reinforcement bars and up to 60 MPa concrete strength, this sleeper delivers structural performance and striking aesthetics for tough retaining walls, garden beds, terraces, and seating features 

Key Features

• Timber-Look Onyx Rustic Finish: Authentic grain texture in a deep charcoal-onyx tone with sealed surface durability .

• 3× N12 Steel Reinforcement Bars: Structural reinforcement suited for walls up to 2.4 m high

• High-Strength Concrete (55–60 MPa): Exceeds standard benchmarks for load-bearing reliability 

• Precise Dimensions & Weight: Available in:

  • 1.6 m (60 kg)

  • 2.0 m (70 kg)

  • 2.4 m (80 kg) 

• 60-Year Design Life: Durable, sealed finish and reinforced core resist moisture, termites, and decay.

Benefits

• Timber Aesthetics, Concrete Durability: Looks like wood but avoids warping, splitting, or rot.
• Enhanced Structural Strength: Three-bar reinforcement offers extra load support.
• Minimal Maintenance: Sealed surface resists staining, fading, and pests—just rinse to clean.
• Cost-Smart Investment: Longevity reduces future maintenance and replacement expenses.
• Versatile Design Use: Optimized for demanding landscaping features like terraces, heavy walls, and built-in seating.

Landscape Ideas

• Heavy-Duty Terracing: Build multi-level retaining walls on sloped sites with confidence.
• Garden Bed Support: Define planter areas or raised vegetable beds with a rich timber contrast.
• Structural Seating Walls: Create durable low seating or benches in paved areas.
• Modern Edging & Steps: Use sleepers as design accents around patios, steps, or feature paths.

How to Use It

1. Install a compacted aggregate base or concrete footing to specification.
2. Set galvanised H‑ or C‑section posts at 1.6–2.0 m centres depending on height.
3. Slot sleepers into post channels, staggering joints for strength and aesthetics.
4. Backfill with gravel and include geotextile behind the wall to maintain drainage.
5. Level and plumb each row before stacking the next.

Coverage Example

A 10 m long wall at 400 mm high (two rows of sleepers):

• ~5 × 2.0 m sleepers per row = ~10 total units

• Add ~10–15% extra for cuts and waste.

Delivery and Pickup Options

We make it easy to get Optimum Onyx Timber Rustic 3‑Bar Concrete Sleeper for your project:

Pickup: Bring your trailer or ute, and we’ll load it for you on‑site.
Delivery: Available across South East Queensland, with clear freight rates displayed during checkout.

Stylish Strength for Demanding Designs

Combine timber-look beauty with three-bar reinforced strength in a sleeper that’s built to last and impress. Ideal for heavy, high-impact landscaping applications. Order today to secure lasting character and structural integrity in your outdoor space.