Catalogue

Composite Sleepers and Posts

Composite sleepers and posts are an engineered, lightweight alternative to concrete and natural timber for a retaining wall. Made from fibre reinforced polymer (FRP), they will not rot, are resistant to moisture and termites, and are easier to handle on sites with tight access. Explore the range below, pick your colours and sizes, and check stock before you start your retaining wall project.

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Shop Composite Sleepers and Posts by type

Composite sleepersFRP sleepers that lift by hand and will not rot.Shop Composite sleepers → Composite postsMatching composite posts for composite sleeper walls.Shop Composite posts → Composite plinthsLightweight plinths to close the gap under a fence.Shop Composite plinths →

3 products

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Prices include GST. Freight calculated separately.

Not sure which Composite Sleepers & Posts you need?

Text us your wall height and length, or a photo of your site, and we'll point you to the right product.

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Lightweight handling

Far lighter than concrete, making each sleeper quicker and safer to lift.

Low maintenance

No rot, no termites and no staining or sealing, unlike timber.

Long term durability

Engineered materials built for Australian conditions, including moisture and UV.

Modern aesthetics

A sleek appearance in colours that blend with modern landscaping.

Choose the right product

Composite or concrete: which to pick.

Both are durable wall products. The choice comes down to the site, the height of the walls and who will install them. Composite sleepers prove their worth where access is poor or lifting gear is not available. Concrete has the widest range of engineered heights. Keep the design of your wall in mind either way.

Retaining wall calculator
ConsiderComposite sleepers and postsConcrete sleepers and steel posts
WeightLightweight. Easier to carry and place by handHeavy. Two people or a machine
InstallationFaster on difficult sites, saving time and labour costsSlower to handle, familiar to every contractor
Wall heightTo the limits in the supplier's engineeringThe widest range of engineered heights
PostsMatching composite postsGalvanised steel posts
UpkeepAn occasional washAn occasional wash

A composite sleeper has its own load limits and is not a like-for-like swap for concrete. In Queensland, walls over 1m high, or walls carrying a load, generally need an engineer's design and council approval. Drainage behind the wall is essential for every material.

Complete the job

Everything else the job needs, in the same order.

Concrete SleepersPlain and patterned sleepers in 75–80mm and 100mm thicknesses.Shop Concrete Sleepers → Retaining Wall PostsGalvanised steel H, C and corner posts to hold your sleepers.Shop Retaining Wall Posts → Under Fence PlinthsConcrete plinths that close the gap under your fence.Shop Under Fence Plinths → Retaining Wall DrainageAg pipe, geofabric and drainage materials for behind the wall.Shop Retaining Wall Drainage →

Order planning

Delivery, lead times and logistics

Delivery

Composite sleepers and posts are long loads delivered by truck. They are lighter than concrete, but tell us about narrow access, steep driveways or overhead obstructions. Unloading equipment is not automatically included.

Lead time

Usually delivered in 2–10 business days. We confirm the date with you before you pay.

Freight is priced to your delivery suburb for most metro areas, or will be confirmed with you before payment.

Delivery and pick up options are shown on each product. Wait for our confirmation before arranging transport or attending for pick up.

Questions

Before you order.

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What are composite sleepers made of?

Our composite sleepers are fibre reinforced polymer (FRP): glass fibre set in resin. That composition gives a strong, lightweight product. It is not the timber and plastic blend used in composite decking.

Are composite sleepers as strong as concrete?

FRP has high strength for its weight, but its performance in a wall depends on the design. Each product has limits on wall height and load. We can provide the supplier's engineering information for your engineer or certifier.

Where can composite sleepers and posts be used?

They are versatile. They are suitable for a low retaining wall, garden beds, garden edging and other landscaping projects, and ideal where concrete is hard to get onto the site. They suit homeowners, landscapers and builders.

How do you install a composite sleeper wall?

Step by step, the work is the same as a concrete sleeper wall: set the posts in concrete, slot in the sleepers, then add drainage and backfill. Lighter pieces make installation quicker, and the result is a clean, modern wall. For safety, wear eye and dust protection if you need to cut FRP.

How do composite sleepers compare with natural timber?

Timber rots, attracts termites and needs staining or sealing to last. Composite sleepers need none of that. Dirt and mould wash off with water. For longevity, we go by the supplier's warranty and do not promise a number of years beyond it.

How do I find prices and lead times?

Each product shows its price including GST, with stock and lead time. Add sleepers and posts to your cart for a quote on the whole project. If you need more information, contact us and we will find the answer with the supplier.

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Guides

Know before you build