Gravel consists of loose rock fragments typically 2–75 mm in diameter. It's used for driveways, walkways, drainage, and as a base layer under concrete and pavers.
Types
- Pea gravel: Smooth, rounded, 3/8" — good for walkways and drainage
- Crushed stone: Angular, interlocks — ideal for driveways and bases
- River rock: Smooth, 1–3" — decorative landscaping
- #57 stone: 3/4" crushed — most popular for driveways
Estimating
1 cubic yard covers about 100 sq ft at 3" depth. Weight: ~1.4 tons per cubic yard (varies by type).