Gravel Types Guide
Choose the right aggregate for your driveway, drainage, or landscaping project in Northumberland County
Gravel and aggregate materials are the unsung heroes of landscaping and construction projects. From solid driveway foundations to decorative garden paths, choosing the right type and size of gravel is essential for project success. This guide covers the most common gravel types available in Northumberland County, their uses, and how to select the right material for your specific needs.
3/4" Clear Gravel
3/4" clear gravel (also called 3/4" crushed stone or 20mm clear) is one of the most versatile aggregate materials. "Clear" means the stone has been washed to remove fines, leaving only uniform-sized pieces that provide excellent drainage.
Common Uses:
- Drainage applications - French drains, weeping tile surround
- Paver base - Base layer for patios and walkways
- Driveway base - Foundation for top-layer gravel
- Foundation drainage - Around house foundations
- Landscaping - Decorative ground cover
Specifications:
- Size: 3/4" (19-20mm) uniform pieces
- No fines (dust/sand) content
- Excellent permeability
- Available in limestone or granite
✓ Advantages
- Superior drainage properties
- Stable base material
- Won't compact or settle
- Resists freeze-thaw damage
- Multiple uses
✗ Disadvantages
- Uncomfortable to walk on
- Can migrate on slopes
- Difficult to push wheeled items
- Not suitable for finished driveway surface
Bag Price: $5-7 per 40lb bag
Coverage: ~100 sq ft per yard at 3" deep
✓ Advantages
- Self-compacting
- Creates solid, stable surface
- Excellent for driveways
- More affordable than clear gravel
- Good load-bearing capacity
- Widely available
✗ Disadvantages
- Poor drainage (holds water)
- Can become muddy when wet
- Tracks into house
- Dusty in dry conditions
- Not suitable for drainage
Bag Price: $4-6 per 40lb bag
Coverage: ~100 sq ft per yard at 3" deep (compacted)
Crusher Run / Granular A
Crusher run (also called Granular A or 3/4" minus) is a mixture of crushed stone ranging from 3/4" down to fine dust. The blend of sizes allows it to compact into a solid, driveway-worthy surface. This is the go-to material for gravel driveways and as a base for other hardscaping projects.
Common Uses:
- Gravel driveways - Primary driveway surface
- Parking areas - Solid, affordable surface
- Base material - Under patios, sheds, etc.
- Farm lanes - Rural property access
- Pathways - Budget-friendly walks
Installation Tips:
- Install 4-6" deep for driveways
- Compact in 2-3" lifts with plate compactor
- Crown the center for drainage
- Top with 3/4" clear or limestone screenings for finished look
Pea Stone / Pea Gravel
Pea stone consists of small, rounded stones typically 3/8" to 1/2" in size. The smooth, rounded appearance comes from natural weathering in water. It's popular for decorative applications where comfort underfoot is important.
Common Uses:
- Play areas - Safe, comfortable surface
- Walking paths - Comfortable underfoot
- Decorative ground cover - Around plantings
- Between stepping stones
- Container gardens - Top dressing
Specifications:
- Size: 3/8" to 1/2" diameter
- Smooth, rounded edges
- Various colors available
- Natural stone appearance
✓ Advantages
- Comfortable to walk on
- Attractive appearance
- Good drainage
- Safe for play areas
- Various color options
✗ Disadvantages
- Migrates easily (not for slopes)
- Difficult to keep in place
- Higher cost than crushed stone
- Hard to push wheeled items
- Weeds can grow through easily
Bag Price: $7-10 per 40lb bag
Coverage: ~100 sq ft per yard at 2-3" deep
✓ Advantages
- Attractive, natural appearance
- Permanent (doesn't decompose)
- Excellent drainage
- Low maintenance
- Various sizes available
✗ Disadvantages
- Most expensive gravel option
- Heavy (harder to install)
- Difficult to remove if needed
- Can scatter into lawn areas
- Weeds grow through easily
Coverage: ~50-80 sq ft per yard at 3" deep
River Rock / Decorative Stone
River rock consists of larger, smooth stones typically ranging from 1" to 6" in size. These decorative stones are perfect for creating visual interest in landscape designs and are often used in dry river beds, water features, and as accent borders.
Common Uses:
- Water features - Ponds, waterfalls
- Dry river beds - Decorative drainage
- Garden accents - Around specimen plants
- Rock gardens - Alpine plantings
- Erosion control - On slopes
Available Sizes:
- 1-2" - Ground cover, top dressing
- 2-4" - Decorative borders, drainage
- 4-6" - Water features, large accents
Limestone Screenings
Limestone screenings are the fine particles (dust to 1/4") left from crushing limestone. When compacted, they create a hard, cement-like surface. They are commonly used as a bedding layer for pavers and as a final layer for gravel driveways.
Common Uses:
- Paver bedding - Final 1" layer under pavers
- Driveway topping - Over crusher run base
- Pathways - Budget walkway surface
- Between flagstones - Filler material
- Under above-ground pools
✓ Advantages
- Very affordable
- Creates hard surface when compacted
- Easy to level
- Widely available
- Good for paver installation
✗ Disadvantages
- Poor drainage
- Can become muddy when wet
- Vulnerable to freeze-thaw damage
- Tracks into house easily
- Requires compaction equipment
Bag Price: $4-5 per 40lb bag
Gravel Size Comparison
Building a Gravel Driveway in Northumberland County
Recommended Construction
A properly built gravel driveway will last for decades with minimal maintenance. Here's the typical construction:
Layer 1: Excavation
Remove topsoil and excavate 10-12" deep. Ensure proper slope (1/4" per foot) for drainage.
Layer 2: Base (6-8")
3/4" clear gravel or recycled concrete. Provides drainage and frost protection.
Layer 3: Intermediate (3-4")
Crusher run. Compacts to create solid driving surface.
Layer 4: Surface (1-2")
3/4" clear gravel or limestone screenings for finished appearance.
Northumberland County Considerations
❄️ Freeze-Thaw Protection
Northumberland County experiences significant freeze-thaw cycles. A deep base of clear gravel is essential to prevent frost heave and maintain driveway integrity through winter.
🌧️ Drainage
Spring runoff and heavy rains require proper drainage. Crown the center of your driveway and ensure water can flow to the sides without pooling.
🚜 Snow Removal
Gravel driveways work well with snow blowers. Avoid metal plow blades that can scrape away your surface material. Mark driveway edges for snow clearing.
Gravel for Drainage Applications
French Drains
French drains use 3/4" clear gravel to create an underground water channel. The clear stone allows water to flow freely to the discharge point.
Recommended: 3/4" clear gravel
Depth: Minimum 12-18" of gravel
Foundation Drainage
Gravel around foundations helps water drain away from the house, preventing basement moisture issues common in Northumberland County clay soils.
Recommended: 3/4" clear gravel
Width: 12-18" around foundation
Dry Wells
Large pits filled with clear gravel that collect and slowly disperse water into the ground. Useful for downspout drainage.
Recommended: 3/4" - 2" clear stone
Size: 3-4 feet deep minimum
Permeable Paver Base
Permeable paver systems require deep, clear stone bases to store and slowly release stormwater.
Recommended: 3/4" clear gravel
Depth: 12-18" for driveways
Finding Gravel Suppliers in Northumberland County
Where to Buy
- Landscape Supply Centers - Best for small to medium orders
- Quarries - Best prices for large orders
- Home Improvement Stores - Bagged material only
- Building Supply Yards - Good selection, delivery available
- Direct from Farmers - Sometimes have field stone available
Delivery Considerations
- Most suppliers offer delivery within Northumberland County
- Typical minimum order: 3-5 cubic yards
- Delivery fees: $50-150 depending on distance
- Ensure truck access to your delivery location
Calculating Your Needs
Quick Formula:
Length (ft) x Width (ft) x Depth (ft) ÷ 27 = Cubic Yards
Example:
20 ft x 10 ft driveway, 6" deep:
20 x 10 x 0.5 ÷ 27 = 3.7 cubic yards
Order 4-4.5 yards (with waste factor)
Related Resources
🧮 Gravel Calculator
Calculate exactly how much gravel you need for your project.
Use Calculator →🏗️ HPB vs Screenings
Compare bedding materials for paver installations.
Read Guide →💰 Project Cost Estimator
Estimate total costs for your landscaping project.
Use Calculator →👷 Find Contractors
Connect with excavation and driveway contractors.
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