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#7 granite, also known as #7 stone, 1/2-inch to 3/4-inch crushed granite, clean granite gravel, or granite drainage stone, is a durable, angular aggregate commonly used for drainage, surfacing, septic systems, and decorative landscaping. It typically consists of clean granite pieces ranging from approximately 1/2 inch to 3/4 inch.
Because #7 granite contains little to no stone dust or fines, open spaces remain between the particles, allowing water to move freely through the aggregate. Its fractured edges help the stone interlock more effectively than rounded gravel, providing a dependable balance of drainage, surface stability, and long-term durability.
Compared with #57 granite, #7 granite is generally smaller and more uniformly sized. #57 granite usually ranges from approximately 1/2 inch to 1 inch, with most pieces averaging around 3/4 inch, making it better suited for heavier drainage, structural support, and load-bearing applications. #7 granite creates a finer, smoother surface and is often preferred for pathways, driveway topping, septic installations, and decorative areas where easier placement and a cleaner finished appearance are important.
Common Applications of #7 Granite
- Driveways and residential access areas
- Walkways and pathway surfacing
- French drains and drainage trenches
- Pipe bedding and utility backfill
- Septic systems and leach fields
- Retaining wall and foundation drainage
- Decorative landscape beds
- Hardscape and outdoor living accents
