AS4419 Soil is a premium, engineered landscape soil formulated to comply with Australian Standard AS 4419 for soils used in landscaping and garden applications.
Lightweight Soil
Lightweight Soil is a specialised growing medium created by blending rich garden soil with 20mm scoria to deliver an ideal balance of nutrition, drainage, and reduced weight. The mix combines dark, organic, crumbly soil with porous, lightweight volcanic rock pieces, producing a structure that is both well-aerated and free-draining, yet supportive of healthy root growth.
Additional Information
Additional information
The soil component provides organic matter, nutrients, and water-holding capacity, while the scoria fraction significantly reduces the overall bulk density of the mix and boosts internal porosity. This makes Lightweight Soil particularly well-suited to rooftop gardens, podium landscapes, and large planter boxes, where weight and drainage are critical design considerations.
Key characteristics:
- Blend of garden soil + 20mm scoria
- Lightweight, free-draining, and well-aerated
- Rich, dark soil for nutrients and moisture retention
- Volcanic scoria for reduced weight and improved drainage
Usage
Lightweight Soil is typically used by landscape architects, builders, and gardeners in projects where conventional soils may be too heavy or poorly draining:
Rooftop & Podium Gardens
- Ideal for green roofs, podium gardens, and elevated landscape areas where structural load is limited.
- The scoria content helps reduce weight per cubic metre while maintaining a suitable rooting medium for plants.
Planter Boxes & Large Containers
- Perfect for large planter boxes, balcony planters, and built-in raised planters.
- Provides good root aeration, prevents waterlogging, and supports healthy plant growth over time.
Urban Landscapes & Engineered Planting Areas
- Used in engineered planting zones where drainage, weight, and performance are specified.
- Suitable under trees and shrubs in constrained or built environments (subject to design requirements).
Improved Drainage Profiles
- Can be used to improve drainage and structure when mixed into heavy or compacted soils in certain landscape situations.
Application Tips:
- Ensure planters, pods, or rooftop systems include adequate drainage outlets and geotextile layers as specified by the designer.
- Install in layers and lightly consolidate by hand or gentle watering—avoid heavy compaction, which can reduce aeration.
- Use with an appropriate fertiliser and maintenance program, as lightweight mixes may drain faster and can require more frequent feeding.
- Always check with a structural engineer for rooftop and podium applications to confirm allowable loads and system design.
Structural Soil is a specialised engineered growing medium that combines high-quality soil with large 40–60mm ballast rock to create a load-bearing,...
