Quick Facts
20mm Minus Roadbase Recycled Concrete & Brick High Compaction Driveways, Paths & Paving
Recycled DGB20 Roadbase is a densely graded, 20mm minus crushed aggregate made from recycled concrete and brick. Designed to compact into a firm, stable base, it is ideal for driveways, pathways, paving preparation and other landscaping or construction applications requiring a strong foundation.
The carefully graded combination of coarse and fine particles allows the material to compact tightly, while the cementitious properties of the crushed concrete and brick help create a durable, well-bound surface. This recycled roadbase is supplied as meeting the former RMS 3051 specification, making it a practical alternative to quarried roadbase for suitable applications.
Key Benefits:
- Excellent Compaction: Densely graded aggregate compacts into a firm, stable foundation.
- Strong & Durable: Crushed concrete and brick provide a hard-wearing base for landscaping and construction.
- Recycled Material: Reuses recovered construction materials, reducing demand for newly quarried aggregate.
- Versatile Applications: Suitable for paving bases, driveways, pathways and general site preparation.
- Improved Ground Stability: Helps establish a more stable working surface over suitably prepared ground.
Ideal For:
- Base preparation beneath paving and pavers
- Driveways and driveway crossovers
- Paths and pedestrian access areas
- Road and hardstand base layers
- Levelling and stabilising suitable prepared surfaces
- Building up firm foundations over appropriately treated soft ground
Features:
- Material: Recycled crushed concrete and brick
- Aggregate Size: 20mm minus, including fines
- Type: Densely Graded Base (DGB)
- Specification: Supplier-stated RMS 3051 compliance
- Finish: Compactable granular base material
- Application: Sub-base and base preparation
How to Use:
- Prepare the ground: Remove vegetation, loose soil and unsuitable material. Establish a firm, properly graded subgrade.
- Set finished levels: Allow for the required compacted roadbase depth, bedding sand where applicable, and the final paving or surface material.
- Spread the roadbase: Distribute evenly over the prepared area, allowing additional loose material for compaction.
- Compact thoroughly: Use suitable compaction equipment and work in manageable layers. Light moisture conditioning may assist compaction where appropriate.
- Check levels: Confirm the compacted surface is firm, even and at the required height and fall.
- Install the surface: For suitable paving applications, add approximately 30mm of coarse bedding sand above the compacted roadbase before laying pavers, subject to the paving manufacturer's installation requirements.
Installation Guide: A compacted roadbase depth of approximately 100mm is commonly used for suitable pedestrian paving applications. Driveways, vehicle traffic areas and unstable ground may require greater depths or engineered preparation. Always follow the relevant project specifications.
Additional Information:
Bulk Roadbase Calculator - How Much Do I Need?
Enter your area and required finished compacted depth. The calculator adds an allowance for the reduction in volume that occurs during compaction.
Estimate Loose Roadbase Required
Installation & Compaction Tips
- Always compact roadbase before installing bedding sand or paving.
- Compact in suitable layers rather than placing very thick loose layers in one application.
- Maintain adequate surface falls to prevent standing water.
- For soft or unstable ground, additional excavation, drainage, geotextile separation or engineered stabilisation may be required.
- Vehicle traffic areas may require thicker base layers and more substantial compaction.
- Cement or lime stabilisation should only be undertaken where specified and appropriate for the project.
Frequently Asked Questions
What does 20mm minus mean?
It means the material contains particles up to approximately 20mm in size, together with smaller aggregates and fines that help it compact tightly.
Is recycled roadbase suitable under pavers?
Yes, where the product and installation are suitable for the project. It provides a compacted foundation beneath the bedding sand and pavers.
How thick should roadbase be?
Approximately 100mm compacted depth is commonly used for suitable pedestrian paving projects. Driveways and other load-bearing applications may require greater depths depending on ground conditions and design requirements.
Does roadbase need to be compacted?
Yes. Proper compaction is essential to achieve a firm, stable base and reduce future movement or settlement.
How much extra roadbase should I order for compaction?
The required allowance varies with material characteristics and installation conditions. Use the calculator as a guide and confirm the appropriate factor with your installer or supplier.
As a recycled aggregate product, colour, composition and appearance may vary between batches. Product suitability and any specification compliance should be confirmed for regulated or engineered applications.
