When it comes to retaining walls in Melbourne, two materials dominate the residential market: besser blocks (concrete masonry units) and concrete sleepers. Both are durable, both are widely used, and both can produce excellent results — but they suit different situations.

This guide compares the two systems across the factors that matter most to homeowners and builders.

What Is a Besser Block Wall?

A besser block wall (also called a concrete block or CMU wall) is built by stacking hollow concrete blocks in a running bond pattern, similar to brickwork. The hollow cores are typically filled with concrete and reinforced with steel rebar for structural walls.

Besser block walls are a monolithic structure — the blocks bond together to form a single solid mass.

What Is a Concrete Sleeper Wall?

A concrete sleeper retaining wall uses precast concrete panels (sleepers) that slide horizontally into the channels of vertical steel H posts. The posts are set in concrete footings, and the sleepers stack between them to form the wall face.

Concrete sleeper walls are a modular system — the sleepers and posts work together but are not bonded.

Comparison: Besser Block vs Concrete Sleepers

Strength and Structural Capacity

Besser blocks: When properly reinforced and filled, besser block walls are extremely strong and can be built to significant heights. They're commonly used for commercial retaining walls and situations requiring very high structural capacity.

Concrete sleepers: FPM's 50 MPa concrete sleepers are cast at higher strength than most besser blocks (typically 20–25 MPa). For residential retaining walls up to 1.5m, concrete sleepers with correctly sized H posts provide excellent structural performance.

Verdict: For walls over 2m or in high-load situations, besser blocks (with engineering) have the edge. For typical residential walls up to 1.5m, concrete sleepers are more than adequate.

Ease of Installation

Besser blocks: Require masonry skills — laying blocks in a level, plumb, running bond pattern takes experience. Filling cores and placing rebar adds complexity. Not a typical DIY project for most homeowners.

Concrete sleepers: The post-and-panel system is more forgiving for experienced DIYers. Posts are set in concrete, and sleepers simply slide into place. No mortar, no rebar placement, no masonry skills required.

Verdict: Concrete sleepers are significantly easier to install for DIY projects. Besser block walls typically require a qualified bricklayer or concreter.

Appearance and Finish Options

Besser blocks: Standard besser blocks have a utilitarian appearance. They can be rendered, painted, or clad to improve aesthetics, but this adds cost and maintenance. Split-face besser blocks offer a more decorative option.

Concrete sleepers: Available in plain, woodgrain, and rockface finishes, with multiple colour options. The woodgrain finish in particular is very popular for residential properties as it complements timber decking and fencing without the maintenance of real timber.

Verdict: Concrete sleepers offer more decorative options out of the box. Besser blocks require additional finishing to achieve a comparable aesthetic.

Cost

Besser blocks: Material cost per square metre is generally lower than concrete sleepers. However, labour costs are higher due to the skill required, and additional costs for rendering or cladding can add up.

Concrete sleepers: Higher material cost per square metre, but lower labour cost for DIY installation. For professionally installed walls, the total cost is often comparable.

Verdict: For DIY projects, concrete sleepers are often more cost-effective overall. For professionally installed walls, costs are similar — get quotes for both.

Drainage

Besser blocks: A solid besser block wall with no weep holes will retain water behind it, building up hydrostatic pressure. Weep holes or drainage cells must be incorporated into the design.

Concrete sleepers: The gaps between sleepers and posts naturally allow some drainage. A proper ag pipe and aggregate drainage system should still be installed behind any retaining wall, regardless of material.

Verdict: Both systems require proper drainage. Concrete sleepers are slightly more forgiving if drainage is imperfect, but this should never be relied upon.

Longevity

Both besser block and concrete sleeper walls, when properly built with adequate drainage, will last 30–50 years or more. The main failure modes are:

• Besser blocks: Cracking due to settlement or movement; render failure
• Concrete sleepers: Post corrosion (mitigated by hot-dip galvanising); sleeper cracking from impact

Verdict: Comparable longevity when both are built correctly.

Repair and Modification

Besser blocks: Difficult to modify once built. Removing or adding sections requires demolition and rebuilding.

Concrete sleepers: Individual sleepers can be replaced without disturbing the rest of the wall. Posts can be extended if additional height is needed (within limits).

Verdict: Concrete sleepers are significantly easier to repair and modify.

Which Should You Choose?

Choose concrete sleepers if:

• You're building a residential retaining wall up to 1.5m high
• You want decorative finish options (woodgrain, rockface)
• You're considering DIY installation
• You want the flexibility to modify or repair the wall in future

Choose besser blocks if:

• You need a wall over 2m high with very high structural requirements
• You're building a commercial or industrial retaining structure
• You prefer a monolithic wall that can be rendered to match your home
• You have access to a qualified bricklayer

FPM Building Supplies Stocks Both

FPM carries a full range of both concrete sleepers and besser blocks, along with all the accessories needed for either system:

• 50 MPa concrete sleepers — plain, woodgrain, and rockface finishes
• Besser blocks — standard hollow and solid options
• Steel H posts — hot-dip galvanised, multiple sizes
• Drainage materials — ag pipe, aggregate, geofabric
• Concrete and cement products — rapid-set, general purpose, and mortar mixes

Visit us at 32 Fullarton Dr, Epping VIC 3076, or call +61 431 235 919 to discuss which system suits your project.