Aggregates are essential in construction, landscaping, and drainage projects, but choosing the right type can be confusing. Different grades of aggregate serve different purposes, from creating a solid base to adding a decorative finish. Decorative aggregates can also enhance the aesthetic appeal of outdoor spaces. Here’s a breakdown of the most common types of aggregates that we sell, and when to use them.
Crusher Dust – The Versatile Filler
Crusher dust is a fine, compactable material that works well for filling gaps and creating a stable base. It’s commonly used under pavers, as a bedding layer for pipes, and in pathways. Because of its fine texture, crusher dust compacts tightly, reducing the risk of shifting and erosion. It is also an affordable option for creating firm surfaces in areas with light foot traffic.
GAP 20 – A Strong Base for Smaller Projects
GAP 20 (General All Passing 20mm) is a well-graded aggregate with particles up to 20mm in size. It’s ideal for small-scale driveways, footpaths, and as a sub-base for concrete slabs. The mix of fine and coarse particles ensures good compaction, making it a reliable choice for solid groundwork. This makes it a great all-rounder for residential projects where a stable base is required.
GAP 40 – The Go-To for Driveways and Paths
GAP 40 contains a mix of crushed rock up to 40mm in size. This makes it a durable option for driveways, pathways, and road bases. It compacts well and provides a stable foundation for further surfacing, such as asphalt or decorative aggregates. Because of its excellent load-bearing properties, GAP 40 is often used in commercial and residential driveway applications.
GAP 65 – Heavy-Duty Support for Large Projects
For larger construction projects requiring serious load-bearing capacity, GAP 65 is the solution. With particles up to 65mm, it is used for roading, large driveways, and foundation work. Its coarser texture allows for good drainage while maintaining stability. GAP 65 is commonly used in civil engineering projects where structural integrity is essential.
Builders Mix – The Essential Concrete Aggregate
Builders mix is a pre-mixed blend of sand and aggregate designed for making concrete. It contains the right ratio of coarse and fine material, making it perfect for DIY and professional concrete projects, such as footpaths, driveways, and foundations. Just add cement and water, and it’s ready to go!
Washed Sand – Fine and Clean for a Range of Uses
Washed sand is a high-quality, clean sand used in various construction and landscaping applications. It is ideal for concrete mixes, rendering, mortar, drainage and of course for building a good sandcastle! The washing process removes impurities, making it a superior option for projects that require clean, fine-grained sand.
No. 2 Paving Sand– Coarser for Drainage and Stability
No.2 paving sand is a slightly coarser grade, making it excellent for applications requiring improved drainage and stability. It’s commonly used for bedding under pavers, horse arenas and golf courses where proper drainage is key.
Horticultural Pumice – Lightweight and Versatile
Horticultural pumice is a porous, lightweight aggregate commonly used in potting mixes, garden beds, and hydroponics. It improves aeration and drainage while helping to retain moisture and nutrients for plant roots. Because of its ability to hold air and water simultaneously, it is ideal for improving soil conditions for a wide range of plants.
Pumice P Metal
Pumice P Metal is a coarser version of horticultural pumice, making it ideal for adding a natural decorative element to gardens and pathways. Will also help suppress weeds while allowing water to drain efficiently, making it perfect for sustainable gardening and landscaping applications.
Drainage Pumice
This larger-grade drainage pumice is a lightweight, porous alternative to traditional drainage metal. Ideal for landscaping and construction, it provides excellent water flow and aeration while reducing overall weight—perfect for retaining walls, soak pits, and planter bases.
Scoria
Scoria is a lightweight, porous volcanic rock ideal for drainage and landscaping applications. Its larger size makes it perfect for use in soak holes, behind retaining walls, or as a decorative ground cover. It offers excellent drainage while maintaining a natural, earthy appearance.
Drainage Metal – Keeping Water Flowing
Drainage metal is specifically designed for water management in construction and landscaping. With a coarse, free-draining structure, it’s perfect for use behind retaining walls, in soak pits, and under driveways to prevent water buildup and erosion. Effective drainage is crucial for preventing soil movement and water damage, making this aggregate an essential component in many outdoor projects.
Gabion Rock – Strong and Decorative
Gabion rock is a larger-sized stone used in wire mesh cages (gabions) for erosion control, retaining walls, and decorative landscaping. It provides excellent drainage and stability while offering a rugged, natural look. Gabion walls are an environmentally friendly alternative to concrete retaining walls, allowing water to pass through while still providing robust support.
Choosing the Right Aggregate for Your Project
- Need a compact base for pavers or pathways? Go with crusher dust.
- Small-scale driveways or concrete bases? GAP 20 is a great choice.
- Building a driveway or road base? GAP 40 offers solid support.
- Large-scale construction with heavy loads? Opt for GAP 65.
- Mixing concrete? Use builders mix.
- Need clean, fine sand for construction? Washed sand is ideal.
- Requiring coarser sand for drainage? No. 2 Sand is a great option.
- Improving soil aeration and drainage? Use horticultural pumice.
- Need a coarser pumice stone for landscaping? Try Pumice P Metal
- Managing water drainage? Use drainage metal.
- Building a strong retaining wall? Gabion rock is the best option.
Using the right aggregate ensures your project is durable, functional, and visually appealing. If you’re unsure which type suits your needs, we can help—just get in touch! Decorative aggregates can also provide that final touch to enhance your outdoor space. We offer delivery across the Bay of Plenty, so contact us today for expert help and a competitive price on the right aggregate for your project.