Filling & Compacting Materials

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If you are looking for some filling material to fill a hole, stabilize some boggy ground or prepare an area for a concrete slab or pavers, Centenary Landscaping Supplies has a complete range to choose from. These products are sourced from a wide variety of quarries and plants in South East Queensland and as with all bulk materials, they are available on site at Darra and can be purchased by the shovel to truck load. To confirm the quantity you need, give the Office a call on 3373 4990 and we will be able to help work out the filling & compacting materials volume required.

To confirm the quantity you need, give the sales team a call on 3373 4999 and we will be able to help you determine the material required.

Filling and Compacting Products

And what are they used for?


Here is one of the most versatile filling products we have. It is basically a crushed blue/grey rock around 20mm in size with smaller sized rock particles right down to “fines” mixed in. This blend of sizes enables the product to be compacted down hard. So for a boggy driveway that needs stabilizing or for preparing a hard surface to lay your pavers on, this is the ideal product.

As well as its compactibility, another measure of a roadbase’s quality is its CBR rating. This stands for the “California Bearing Ratio” and refers to the actual strength of the rock itself. Obviously, for any area that requires a hard surface, it is important that the rock used does not disintegrate under load (e.g. a car) so we make sure that we supply a roadbase with a CBR of 45 or higher and one that is used extensively by road builders around Brisbane.

Two final notes about the use of roadbase: Firstly, when it is compacted it will reduce in volume, for example, if you compact a 100mm layer it will reduce to between 75-80mm; secondly, to get the best compaction possible, make sure that the material is wet, as this helps all the “fines” bind tightly with the larger stones.

Crusher Dust

From the same quarry and the same blue/grey colour but Crusher dust is made up of only the finer material. Crusher dust, if wet sufficiently, will also compact down hard and will give a smooth finished surface. 

One way that both roadbase and crusher dust can be made more “durable” is with the addition of cement. This is referred to as “stabalising” and is common practice in areas of high traffic or potential erosion. How much cement is added is up to the individual but generally around 4-8 bags per Tonne of product is the preferred mix ratio.

It is important to note that many paving manufacturers stipulate that crusher dust should NOT be used under their pavers otherwise the warranty will be null and void. Stick to using bedding sand and Roadbase in these situations.

Decomposed Granite

Decomposed Granite is often called “Deco” and is generally an orange/brown colour. Deco is quite fine (about 3mm and less) and if you imagine the finish on a clay tennis court, then that will give you a good idea as to what it looks like.

Deco can be used as a compacting material but is not as efficient as Roadbase or Crusher dust. Due to this, it is sometimes used as a thin “finishing” layer over the top of a compacted roadbase path to give the preferred natural look of Deco. Numerous bush walking tracks around Brisbane use Deco Granite as a finishing layer e.g. Mt Cootha bush trails.

Like both Roadbase and Crusher Dust, Deco can also be stabalised with cement. It is recommended a white or off white coloured cement is used, but bear in mind this will alter the finished colour.

Recycled Concrete Products

Of recent times, old concrete is being recycled and used to manufacture a whole range of filling products that include a manufactured Roadbase, Crusher dust and drainage gravels. These filling products do not have the strength of their natural counterparts, or the same compactibility but are definitely a more economical filling and compacting option.