Licensed and insured, building retaining walls across the Adelaide Hills since 2009
Timber sleeper is the budget option for a low garden terrace, concrete sleeper is the volume product for most boundary and sloped-block walls, and core-filled besser is the engineered premium for tall or surcharge-loaded walls that have to be certified. A straight comparison on strength, height, cost and the footing each one needs.
Timber sleeper, concrete sleeper or core-filled besser. These are the three materials most homeowners weigh up, and the honest answer is that they suit different walls. Here is the straight comparison on strength, height, cost and the footing each one needs, so you can match the material to your slope.
Treated pine or hardwood sleepers, posted into concrete, are the cheapest way to build a wall. They suit lower garden terraces, up to around a metre. The trade-off is life. Timber weathers and can rot if water sits against it, so the drainage matters even more here. A well-built timber wall with proper footings and drainage lasts a good while, but it is the material most likely to need attention first.
Steel-reinforced concrete sleepers drop between galvanised posts set in concrete footings. They are the sweet spot for most boundary and sloped-block walls on the Hills: stronger and longer-lasting than timber, for a small step up in price. They do not rot, they handle the common heights, and they rake down a slope cleanly. For most jobs, this is the wall we recommend.
Core-filled besser is reinforced masonry. The hollow blocks are filled with concrete and steel and sit on an engineer-designed footing. It is the choice when the wall is tall, carries a load, or has to be certified. It costs more, but it holds what the lighter walls should not. Past a metre, or under a driveway, this is often the right call.
The material decides the look and the price. The footing and the drainage decide whether the wall is still straight in twenty years. That part is the same whichever material you pick.
Whichever material you choose, the wall lives or dies on the footing and the drainage. A leaning wall is almost always a footing or a water problem, not a block problem. We size the footing to the wall and the soil, and we drain every wall, which is why our warranty covers the structural workmanship and the drainage on any of the three.
Ask this, exactly
“For my height and the load above the wall, which material would you put in, and what footing and drainage will it get? Will those be on the quote?”
A genuine quote names the material and the footing for it. A round number with no breakdown hides whether the wall is built for its height and load.
Compare all three on our estimator to see the price gap for your length and height. Then we talk it through on the free site assessment: the fall, the soil, the load above, and what suits your block. We will tell you honestly which one we would build, and why.
Tierline Retaining Walls