Type 3 Limestone Permeable Sub-base - SUDS Compliant Aggregate
What is Type 3 Sub-base?
Type 3 sub-base is an engineered crushed granite or limestone aggregate specifically designed for permeable paving systems and SUDS (Sustainable Urban Drainage Systems) applications. Conforming to Ministry of Transport Specification SHW Clause 805, this 0-40mm blended material features reduced fines content compared to Type 1, allowing superior water infiltration while maintaining structural integrity for modern sustainable construction.
Technical Specifications:
- Standard: SHW Clause 805 compliant
- Grading: 0-40mm with reduced fines
- Material: Crushed granite or limestone
- Permeability: Free-draining design
- Certification: BS EN 13285 unbound mixtures
SUDS Applications in Development
Permeable Paving Systems:
- Driveways - Prevents surface water runoff
- Car Parks - Commercial SUDS compliance
- Patios - Sustainable garden drainage
- Access Roads - Reduces flood risk
Specialist Applications:
- Tennis Courts - Professional drainage base
- Sports Pitches - All-weather playability
- Equestrian Arenas - Superior drainage performance
- Tree Root Protection - Allows air and water movement
- Cellular Systems - Grass reinforcement grids
Type 3 vs Type 1 - Understanding the Difference
| Specification | Type 3 | Type 1 |
| Fines Content | Reduced | Standard |
| Drainage | Excellent | Limited |
| SUDS Compliant | Yes | No |
| Permeability | High | Low |
| Applications | Permeable systems | Standard construction |
Coverage Rates:
- Compaction Factor: 2.2 tonnes per m³
- Coverage: 0.33 tonnes per m² at 150mm
Environmental Benefits
- Flood Prevention: Reduces surface water runoff
- Groundwater Recharge: Allows natural infiltration
- Planning Compliance: Meets sustainable drainage requirements
- Water Quality: Filters pollutants naturally
- Urban Cooling: Reduces heat island effect
Delivery Options Throughout Thames Valley
- Small Loads: Perfect for DIY projects and repairs
- Bulk Delivery: Cost-effective for larger construction sites
- Coverage Areas: Thatcham, Newbury, Reading, and all surrounding Berkshire villages
- Same-Day Delivery: Available for urgent requirements (subject to availability)
