Granular A
Road base material engineered for maximum stability under the heaviest loads and most demanding conditions.
What is Granular A?
Granular A (also known as "Gran A" or "road base") is a precisely engineered aggregate blend that meets strict Ontario provincial standards for road construction. It's a mix of crushed stone ranging from 3/4-inch down to fine particles, with specific gradation requirements that ensure optimal performance.
Unlike crusher run, which can vary in composition, Granular A must meet MTO (Ministry of Transportation Ontario) specifications for particle size distribution. This ensures consistent performance in critical applications where failure isn't an option.
In Northumberland County, Granular A is the professional choice for commercial projects, heavy-duty driveways, and applications where maximum load-bearing capacity is required. It provides superior stability compared to standard crusher run while maintaining excellent drainage characteristics.
Key Properties
- Engineered gradation: Meets strict MTO specifications
- Maximum stability: Highest load-bearing capacity
- Consistent quality: Standardized composition
- Excellent drainage: Water passes through freely
- Freeze-thaw resistant: Handles Ontario winters
Quick Facts
| Particle Size | 3/4" minus (specification grade) |
| Density | ~1.7 tonnes/cubic yard |
| Best For | Heavy loads, commercial |
| Depth Required | 6-12 inches |
| Compaction | Requires heavy equipment |
Calculate Granular A Needs
Use our calculator to determine exactly how much Granular A you need for your heavy-duty project.
Gravel Calculator →Common Uses for Granular A
Commercial Driveways
The standard for commercial parking lots and heavy-traffic driveways where maximum load capacity is essential.
Industrial Bases
Used under heavy machinery, equipment pads, and in industrial yards where failure would be catastrophic.
Road Construction
Meets specifications for municipal road base, pathways, and public infrastructure projects throughout Ontario.
RV & Heavy Vehicle Pads
Essential for parking RVs, motorhomes, and heavy trucks where concentrated loads require superior support.
Retaining Wall Base
Provides the most stable foundation for large retaining walls where settlement cannot be tolerated.
High-End Residential
Premium homeowners choose Granular A for driveways that must last decades with minimal maintenance.
Installation Tips
1. Site Assessment
Granular A is typically used where soil conditions are poor or loads are extreme. Consider soil testing for commercial applications to determine exact depth requirements.
2. Excavation Standards
Excavate to proper depth allowing for the full Granular A layer plus any wearing surface. For heavy commercial loads, 12 inches of properly compacted Gran A is standard.
3. Separation Layer
Install high-quality geotextile fabric between native soil and Granular A. This prevents contamination and maintains the engineered gradation of the aggregate.
4. Proper Compaction
Granular A requires heavy compaction equipment. A plate compactor is insufficient for deep layers; use a vibrating roller for professional results.
5. Moisture Control
Optimal compaction requires precise moisture content. Too dry and the material won't bind; too wet and stability is compromised. Professional installation includes moisture testing.
💡 Specification Tip
When requesting quotes, specify "MTO Granular A" to ensure you receive specification-grade material rather than generic crusher run that may not meet engineering standards.
Where to Buy Granular A in Northumberland County
Granular A is available from professional-grade suppliers:
- MTO-certified aggregate suppliers
- Commercial construction suppliers
- Large landscape supply yards
- Direct from licensed quarries
Note: We do not sell materials. Contact local suppliers for current pricing and availability.
✓ Professional Standard
Granular A is the material of choice for contractors who warranty their work. When failure isn't an option, specify Granular A.
Granular A vs Crusher Run
| Feature | Granular A | Crusher Run |
|---|---|---|
| Specification | MTO Standard | Variable |
| Consistency | Guaranteed | May vary |
| Load Capacity | Maximum | High |
| Best For | Commercial, heavy loads | Residential driveways |
| Cost | Higher | More Affordable |