If you have ever driven past a worksite, peered into a landscaping yard or wandered round a quarry depot in Australia then it’s likely that you will have come across the phrase cracker dust. It’s a name that like so many other trade specific names and labels on the market today, sounds yet simple when you are unfamiliar but can be more of a headache when getting an item in for the first time as a homeowner for your own use. But what is cracker dust exactly, what do we use it for and why have homes and landscapers relied on this product so heavily for such a long period of time?
Here we take a look at everything you need to know from what it’s made of and what we use it for to why it can often be just as much about getting it delivered as the actual material itself!
What Is Cracker Dust?
Cracker dust is the fine aggregate by-product resulting from the crushing and screening of quarried rock, such as granite, basalt or blue metal. It is sometimes called blue metal dust, crusher dust or decomposed granite. When large stones are crushed to produce aggregate for concrete, road base and other building products, the unwanted fine material, usually less than 2 or 5mm in size is separated, screened and sold as cracker dust.
Since cracker dust is a by-product of the crushing process rather than a finished and specially created product, it is usually significantly less expensive than sand or purpose blended road base while maintaining improved drainage and compaction benefits.
The composition of cracker dust can differ slightly based on the type of source quarry material and parent rock makeup although the general characteristics have remained largely unchanged, notably the fine, gritty nature of the material, its high compression capability and load resistance once packed.
Common Uses of Cracker Dust
Cracker dust has established itself as a popular material of choice throughout residential, commercial and civil construction projects. It is commonly used in the following ways:
- Underlying layer for synthetic, artificial, or man made grass installations
- Bedding and screeding layer beneath pavers, patios and walkways
- Backfill and bedding over and around drainage pipes, trenches
- Sub-base material suitable for paths, driveways and car parking areas.
- Levelling and packing on edges and around retaining walls and edging
- Sort earthworks and erosion control on sites
Perhaps the greatest appeal of cracker dust is its obvious versatility. It is kept on hand by almost every landscape supply yard and quarry in the United States. Whether you are a landscaper preparing a commercial property or an individual homeowner building a path in your backyard, cracker dust is probably stored in a convenient location and readily adaptable.
Benefits of Using Cracker Dust
- Excellent Compaction
Cracker dust Also known for its tightly compact ability after it has been spread and watered-down. When compacted with a plate compactor or roller, the small particles tightly adhere together and compact into a heavy, heavy base that remains solid for years to come. Perfect for pavers, artificial turf or general walking, especially in windy conditions.
- Reliable Drainage
Unlike clay based fill materials, cracker dust drains water not puddles on top, making it ideal for use in garden beds, base for synthetic lawns and walkways in wet areas to minimize waterlogging and erosion.
- Cost-Effective
Given that cracker dust is a by-product of the quarrying process, as opposed to a treated product, it is typically more cost-effective than sand or gravel or a used-blend base material. When large quantities are being used for fill, these savings can be considerable:
- Environmentally Sensible
It takes advantage of material which would normally be deemed a waste product of the crushing process to make the cracker dust. Selecting this over virgin-mined cracker dust ensures more judicious use of quarried aggregate.
- Easy to Work With
The fine uniform grain size means cracker dust spreads easily, screens and levels by hand or by machine, which is one of the reasons it is still popular with both DIY renovators and professional tradesmen.
Applications Across Industries
Though most popular in home gardening and landscaping, cracker dust can be used for:
- Construction: used as a compactable sub base beneath slabs, driveways and site access roads
- Civil works: used for trench reinstatement, pipe bedding, general earthworks
- Mining and industrial grounds: hardstand areas & access roads within the site
- Artificial Grass & Turf-What Goes on: In terms of canopy walkways, the standard base of choice for most artificial grass installations is-cement
- Council and public infrastructure: used in footpath, nature strips and park surfacing
Note that cracker dust is not something that is normally used as the primary surface on a driveway or an area that will have a high volume of traffic on it. Cracker dust tends to be used more as a construction surface between the main rolling layer and the final surface. Usually, the coarse road base material with a bigger aggregate is suitable for such purposes, sometimes used with cracker dust on top for screeding and levelling.
A Note on Sourcing and Safety
Cracker Dust is a natural quarried product and so constitutes a unique blend of elements that varies from region-to-region as the parent rock varies. Reputable dealers should carefully screen and test their material to make sure that it is suitable and free from unwanted contaminants. If in doubt it is always worth checking with your supplier-in particular for larger commercial orders.
Getting Cracker Dust Delivered Where You Need It
Finding the correct material is just part of the equation. Ensuring the correct volume reach site, on schedule and hassle free, is equally crucial in keeping a project running to schedule. Be it a trailer load to build a backyard patio or bulk tonnes to develop a retail complex, quality bulk transport is the essential ingredient.
We help builders, landscapers and home owners and throughout Australia with bulk delivery and transportation of cracker dust, road base, sand, aggregates. We manage single residence to multi area deliveries delivering on time every time with our experience to eliminate guess work.
Final Thoughts
Cracker dust might seem like just a humble, dusty waste product from the quarrying process, but in fact it has a versatile and valuable place in construction and landscaping projects in Australia. With its appeal as a cheap alternative, and with good compaction and drainage properties, cracker dust is widely used under artificial lawns, for trench bedding and for pathway bases. To get the most from any bulk material supply, including cracker dust, it is critical that as well as choosing the right product, you can access reliable and well-planned delivery, to ensure it is available when you need it.
FAQs
What is cracker dust made of?
Cracker dust is a fine crushed product from quarried rock such as granite or blue metal and is produced during aggregate crushing. The particles are usually between 2 and 5mm in size, screened for uniformity and suitable for building work.
Is cracker dust the same as crusher dust?
Yes cracker dust and crusher dust are typically defined as the same thing. Different names are used around Australia and worldwide, such as blue metal dust or decomposed granite but they are no different.
Can cracker dust be used under driveways?
Cracker dust by itself isn't very good for a driveway that will have cars driving on it frequently. It's more for laying down under paving or turf. A coarse road base and sometimes cracker dust over the top of it for screeding is usually best for driveways.
How much cracker dust do I need for artificial grass?
The general rule of thumb for artificial grass installations is a minimum 100mm of compacted base underneath. Quantity required will vary depending on the size and depth to be installed in your area. It is best to measure your square metres to enable accurate calculation to be made of the delivered volume required.
Does cracker dust drain well?
Can be used as a good well draining base, once compressed the water filters through the cracker dust rather than pooling.
Excellent for garden beds, pathways and synthetic lawns, particularly in the wetter areas of Australia, where it is susceptible to waterlogging.
Is cracker dust cheaper than sand?
In most cases yes, as a byproduct of quarrying rather than a deliberately manufactured product cracker dust is generally cheaper than sand or whatever base product that has been specifically blended for the purpose, particularly for larger bulk landscaping or construction applications.
