Build Strong Bases That Last: Road Base Vs Crusher Dust For Driveways, Paths And Pavers

Coastal weather can be tough on driveways and paths. Summer storms test drainage. King tides push water where you least expect it. The right base is the difference between a surface that settles and one that slumps. In this guide, we keep it simple and local, so you can choose the best base for Fraser Coast conditions and install it with confidence.

A quick overview: road base vs crusher dust

• A-grade road base is a blend of crushed rock with fines. It locks up hard when compacted and handles vehicle traffic well. Think driveways, hardstands and under slab areas where strength and durability matter.
• Crusher dust is a finer crushed product that compacts into a smooth, dense layer. It is great under pavers and for pedestrian paths where you want a tight, level finish.

Both are coastal friendly when compacted properly. The choice comes down to the traffic load and the finish you need.

Which base to use where

• Coastal driveways and hardstands: Use A-grade road base as the main foundation. It binds well, resists rutting and sheds water evenly when graded with a slight crown or crossfall.
• Garden paths and light use areas: Crusher dust gives a neat, firm walking surface that sits flat underfoot. It also makes an excellent bedding base beneath pavers.
• Paved areas, patios and pool surrounds: Use compacted A-grade road base as the sub-base, topped with a compacted layer of crusher dust, then a thin screeded sand layer for final leveling before pavers. This three-layer approach spreads load and keeps joints tight.

If you are unsure, tell us what is going on top, how often vehicles will use it and what the site drainage looks like. We will point you to the right mix.

Recommended depths that work on the Fraser Coast

These depths are typical for our coastal soils and wet season. Adjust for very soft ground or heavy vehicle use.

• Driveways for cars and utes: 100–150 mm of A-grade road base, compacted in two lifts. On weak subgrade, start with 150–200 mm and consider a geofabric separator.
• Trailer or light truck access: 150–200 mm of A-grade road base, compacted in lifts. Heavier loads need more thickness and careful drainage.
• Garden paths and informal areas: 75–100 mm of crusher dust, compacted. If the subgrade is sandy or soft, place 50 mm of A-grade road base first, then 50 mm of crusher dust.
• Under pavers: 75–100 mm of A-grade road base, 30–50 mm of crusher dust, then 20–30 mm of screeded paving sand. Compact each layer before the next.

Pro tip: compact in lifts no thicker than 75 mm. Thin lifts bond better, drive out more air and give you a stronger finish.

How to compact properly

• Prepare the subgrade. Remove grass and soft spots. Shape a 1–2 percent fall so water has somewhere to go.
• Moisten each layer. Materials should be damp, not wet. If you squeeze a handful and it holds shape without dripping, you are close.
• Compact with the right machine. Use a plate compactor for paths and pavers. Use a heavier plate or a small roller for driveways. Make multiple passes with overlapping runs until the tone changes and the surface feels tight.
• Check levels as you go. Correct high and low spots before the next lift. It is much harder to fix after paving.
• Lock in the edges. Edge restraint prevents creep, keeps compaction intact and protects against washouts.

Stopping edges from slumping or washing out

Summer downpours and king tides can nibble away at the edges first. A few simple steps prevent costly repairs.

• Install edge restraint. Use concrete kerb strips or set-downs made on site with our concrete supplies. Place them on compacted base, set to height and allow them to cure before backfilling.
• Add fall and outfalls. Aim water to a safe place. A shallow crossfall on driveways and paths moves water off quickly. Include a spoon drain or side swale where needed.
• Use drainage gravel where water collects. A trench with 20 mm drainage gravel along the low side relieves pressure on the base and reduces fines washing out.
• Seal joins and transitions. At the meeting point with a road, shed or slab, tie edges in so water cannot get underneath.
• Consider a stabilising layer on soft ground. A geofabric separator under the first lift keeps fines from pumping up in heavy rain.

A simple workflow you can follow

1. Subgrade: Strip grass and organics, level and set your fall.
2. Sub-base: Place A-grade road base to the target depth, in 50–75 mm lifts, moisture condition and compact each lift.
3. Bedding: For pavers, add crusher dust and compact, then screed a thin sand layer for accurate levels. For paths that finish in crusher dust, compact to your final grade and lightly water to set.
4. Edges and set-downs: Form small kerbs, haunches and step edges using on-site mixes made from our concrete supplies. We stock General Purpose Cement, 20 kg concrete bags and sand-and-gravel premix for these tasks.
5. Finish: Lay pavers, tap to level, fill joints, then compact gently with a rubber mat on the plate. For crusher dust paths, top up lightly and re-compact after a day if needed.

Preventing washouts in coastal weather

• Build high enough. Set finished levels above surrounding ground so water flows away, not onto your work.
• Keep a neat crown on driveways. A slight centre rise sheds water to both sides.
• Top up periodically. After a very wet season, a quick re-roll and a light top up can restore a tight surface.
• Control run-on. Divert roof and yard water before it reaches the driveway or path.

Estimating volumes, the easy way

You can estimate quantities with a simple formula. Measure length x width x depth, all in metres, to get cubic metres. Otherwise, just pop it all in our handy Volume Calculator.

Examples:

• 10 m long x 3 m wide driveway with 0.12 m depth of road base equals 3.6 m³.
• 15 m path x 1 m wide with 0.08 m depth of crusher dust equals 1.2 m³.

Add 5–10 percent for compaction and trimming. If access is tight or you need different materials in stages, we can split the order and schedule staggered loads so crews stay productive.

Local delivery and planning support

We deliver across the Fraser Coast from our yard in Howard. Tell us your site access, preferred drop points and timing. We can line up morning and afternoon drops, or same-day where possible, so your base is on the ground when you need it. If you are picking up, most orders are ready in about two hours.

Bring your measurements in, or call us at 0408 466 287, and we will help refine volumes, suggest the right depths for your soil and plan the sequence.

When to choose each material

• Choose A-grade road base when vehicles are involved, when the subgrade is variable, or when you need maximum stability.
• Choose crusher dust when you want a smooth, tight finish for paths or as a bedding layer that helps pavers sit firm and level.
• Combine both for paved areas and high use spaces — road base below and crusher dust above.

Ready to get started?

We are here to help you build a base that lasts. Visit us at 50 Old Bruce Highway, Howard, or call 0408 466 287 to chat through your plan. Browse our full range of bulk landscaping materials, or check out our concrete supplies for kerbs and set-downs. Summary: A-grade road base gives strength for driveways and hardstands. Crusher dust gives a tight finish for paths and bedding. Compact in thin, damp lifts, lock the edges and guide water away — your driveway or path will stand up to summer rain and look great year round.