Quarry Fines (¼" Minus) — Dense, Compactable Base Material
 
Quarry Fines, also known as ¼" minus, are a finely crushed aggregate blend made up of angular stone particles ranging from ¼ inch down to stone dust. This well-graded mix compacts tightly when installed and lightly moistened, creating a firm, stable surface ideal for both landscaping and construction applications.
 
Sourced from high-quality rock quarries, quarry fines are engineered by the crushing process itself—meaning the fines and dust are not added artificially. The result is a naturally binding material that locks together under compaction, reducing movement, and rutting.
 
At North Bay Materials, our quarry fines are sorted, consistent, and professionally screened to ensure dependable performance for residential and light commercial projects throughout the North Bay and Bay Area.
 
Common Uses & Applications for Quarry Fines (¼" minus)
Quarry fines are valued for their compaction and versatility, making them suitable for a wide range of residential and light commercial applications. Because the blend includes angular stone and fines down to dust, it creates a interlocked surface that performs well both as a base layer and, in some cases, as a finished surface.
 
Ideal Applications
Pathways & Walkways
Creates a smooth, firm walking surface that resists shifting and erosion when compacted properly.
 
Driveway Base & Top Layer
Commonly used as a base course under artificial grass, pavers, stepping stones, gravel, or asphalt, and sometimes as a finished rustic driveway surface for low-traffic areas.
 
Paver & Flagstone Base
Provides excellent load distribution and minimizes settling beneath pavers, patios, and stepping stones.
 
Patios & Seating Areas
Compacts into a clean, stable surface ideal for informal patios, fire pit areas, and utility yards.
 
Shed Pads & Utility Pads
Forms a dense foundation for sheds, containers, trash enclosures, and equipment pads.
 
Landscape Transitions & Fill
Perfect for smoothing grade changes, filling low spots, and tying hardscape elements together.
 
Material Specs & Technical Notes
Type: Quarry fines, screened and crushed rock byproduct (¼" minus with fines).
Texture: Fine, sandy consistency with small angular particles; compacts tightly.
Color: Predominantly gray/blue (varies by quarry source in Marin, Alameda, San Mateo, San Francisco, Contra Costa and Sonoma counties).
Gradation: Contains a mix of fines and small rock dust for compaction.
Compaction: Moderate — locks in place when compacted, making it suitable for pathways, bases, and backfill.
Permeability: Low — designed to compact, which reduces water infiltration.
Durability: Weather-resistant, suitable for both residential and light commercial applications.
Weight Per Cubic Yard: ~1.3 to 1.5 tons.
Standards: Meets common local construction and landscape specifications (specific sieve analysis available upon request).
Packaging: Sold per cubic yard, delivered loose in bulk via dump truck.
 
Coverage, Ordering & Bulk Delivery of Quarry Fines
 
North Bay Materials makes it easy to order quarry fines (¼" minus) in bulk and have them delivered directly to your home or job site—no yard trips, no guessing, no wasted time. Our delivery-only model is designed for residential and light commercial projects that need reliable material and professional logistics.
 
How Much Quarry Fines Do You Need?
Sold by the cubic yard
1 cubic yard covers approximately:
150 sq ft at 2 inches deep
100 sq ft at 3 inches deep
Ideal base depth:
2–3 inches for pathways and patios
 
If you’re unsure, our team can help you calculate the right quantity based on your project dimensions and intended use.
 
Bulk Dump Truck Delivery
Our driveway-friendly dump trucks are ideal for tight residential streets, narrow access points, and urban job sites—perfect for quarry fines delivery where full-size transfers can’t reach.
 
Typical delivery capacities:
5–7 cubic yards of quarry fines per load
 
Just let us know your preferred drop spot, and our driver will do their best to place the material where you need it.
 
Fast, Local Service You Can Count On
We provide dependable quarry fines delivery across Marin, Sonoma, Alameda, Contra Costa, San Francisco, and San Mateo counties, serving homeowners, contractors, landscapers, and builders who need materials delivered on time and ready to work. From small backyard paths to full driveway bases, North Bay Materials delivers quarry fines you can trust—professionally sourced, and locally delivered.
 
 
Frequently Asked Questions - Quarry Fines 1/4-inch minus
Q: What are Quarry Fines (¼" Minus) best used for?
A: Quarry Fines are ideal for pathways, compacted bases under pavers or flagstone, and light-duty driveways. Because the material includes fine particles, it compacts firmly for a smooth and stable surface.
 
Q: Can I use this material for drainage?
A: Quarry Fines are not recommended for drainage since the fine particles reduce water permeability. For drainage applications, use a washed angular product such as ¾” Drain Rock.
 
Q: How much material do I need for my project?
A: Use our Material Volume Calculator to estimate coverage. As a general rule:
1 cubic yard covers ~300 sq ft at 1” depth.
1 cubic yard covers ~150 sq ft at 2” depth.
 
Q: Will the fines track onto shoes or into the house?
A: Some loose fines may stick to shoes, especially when dry. Light watering or sealing can help reduce dust and tracking in high-traffic areas.
 
Q: Do Quarry Fines harden over time?
A: Yes — when compacted and lightly watered, Quarry Fines bind together to create a semi-solid surface. For even greater durability, a stabilizer additive can be mixed in during installation.