7mm Scoria

The colour range generally includes deep red-brown, maroon, dark rust, and charcoal tones, giving it a distinct appearance compared to standard grey crushed rock. Its porous structure makes 7mm Scoria significantly lighter than dense aggregates, while still offering excellent drainage and structural support in many non-structural applications.

Key characteristics:

• Approx. 7mm lightweight volcanic rock
• Highly porous, vesicular structure
• Warm red-brown and charcoal colour palette
• Excellent for drainage, backfill, and decorative use

Usage

7mm Scoria is commonly used by builders, landscapers, and civil contractors across a broad range of practical and decorative applications:

1. Drainage & Backfill

   • Ideal for free-draining backfill behind retaining walls and in drainage trenches.
   • The porous, lightweight stones provide excellent void space for water movement while reducing load on structures.

2. Landscaping & Garden Beds

   • Used as a decorative mulch or ground cover in garden beds and around plantings.
   • Helps suppress weed growth, retain some moisture, and add a distinct volcanic aesthetic with its red/charcoal tones.

3. Planters & Potting Mixes (Blends)

   • Often incorporated into special potting or planter blends to improve aeration and drainage.
   • Lightweight nature reduces the overall weight of large planters while maintaining structure.

4. Lightweight Fill & Non-Structural Applications

   • Suitable for non-structural lightweight fill where reducing dead load is beneficial.
   • Used in some landscape features, rock gardens, and rain garden designs as part of the drainage or decorative layer.

Application Tips:

• When using in drainage or backfill, consider pairing with geotextile fabric to limit the ingress of fines.
• For decorative use, rake level after placement and top up periodically as required.
• Always confirm with your engineer or designer before using in any application where structural loads or specific performance criteria apply.