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 DELIVERY 
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Blue Metal 20mm is one of Perth’s most common and versatile construction and landscaping materials.
 
What is Blue Metal 20mm?
Blue Metal 20mm is an aggregate (crushed rock) with individual stone pieces approximately 20mm in size.
It’s angular, giving excellent interlock and stability for construction and drainage applications.
The colour ranges from blue-grey to dark grey, depending on the quarry source.
 
What is Blue Metal 20mm Made From?
Crushed from basalt or dolerite rock, known for:
High density and hardness
Excellent durability
Sometimes sourced from granite in some WA quarries.
 
Because it’s hard and angular, it compacts and locks together well for structural uses.
 
What is Blue Metal 20mm Ideal For in Perth, WA?
Blue Metal 20mm is ideal for:
✅ Drainage applications → behind retaining walls, soak wells, trenches
✅ Driveways → as a decorative gravel surface or base layer
✅ Concrete aggregate → used in ready-mix concrete
✅ Decorative landscaping → modern grey aesthetic
✅ Base under slabs or paving → strong load-bearing layer
✅ Rural roads, verges, and firebreaks → stable and weather-resistant
 
Perth advantages:
Perfect for sandy Perth soils needing stable foundations
Withstands Perth’s dry climate and heavy rain
Matches modern landscaping colours popular in WA
 
Recommended Thickness for Blue Metal 20mm Layers
Drainage trenches/backfill:
🔹 Typically 100–300 mm, depending on the drainage design
Driveway surface layer (decorative use):
🔹 50–75 mm depth
Under concrete slabs or paving:
🔹 50–100 mm, compacted
Road base or rural tracks:
🔹 Often combined with finer materials or road base underneath
 
For drainage, the layer thickness depends on the required water flow capacity.
 
How to Maintain Blue Metal 20mm Surfaces
Rake occasionally to redistribute displaced stones.
Top up periodically — especially in driveways or high-traffic areas.
Install solid edging to prevent migration into garden beds or lawns.
Weed control:
Use geotextile weed mat underneath
Spot spray or manually remove weeds
Keep debris off decorative areas with a blower or broom.
 
Key Benefits of Blue Metal 20mm in Perth:
✅ Extremely durable and weather-resistant
✅ Ideal for drainage and structural strength
✅ Low maintenance compared to finer gravels
✅ Modern aesthetic for landscaping
✅ Widely available across Perth quarries
 
Blue Metal 20mm vs. Other Aggregates:
Blue Metal 20mm: Coarse, angular, high load-bearing, drainage and decorative uses
Metal Dust: Fine crushed rock for compacted bases under paving
Road Base: Mix of rock, fines, and sand for structural bases
Crushed Limestone: Lighter in colour, good for driveways and pathways
 
Are you thinking of using Blue Metal for a driveway, drainage, or decorative landscaping in Perth? Let us know your project, and w can help calculate quantities or suggest the best installation approach!