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Introduction
A strong and properly installed sub-base is essential for any driveway or patio project. The correct sub-base depth helps prevent sinking, cracking, and movement over time. In this guide, we explain how deep a sub-base should be for different projects and why proper preparation is important.
What is a Sub-Base?
A sub-base is the layer of compacted material installed beneath a driveway, patio, or paved surface. It provides strength, stability, and drainage while supporting the finished surface above.
MOT Type 1 is one of the most commonly used sub-base materials in the UK.
Recommended Sub-Base Depth for Driveways
For domestic driveways, the recommended compacted sub-base depth is usually:
- 100–150mm for cars and light vehicles
- Deeper for heavier vehicles or poor ground conditions
A stronger sub-base improves load distribution and helps extend the lifespan of the driveway.
Recommended Sub-Base Depth for Patios
Patios generally require a slightly shallower sub-base compared to driveways.
Typical depth:
- 75–100mm compacted depth
This provides enough support for paving slabs while maintaining good drainage.
Why Proper Compaction Matters
Even with the correct depth, poor compaction can cause future problems such as sinking or uneven surfaces. The sub-base should be compacted in layers using suitable equipment.
Common Mistakes to Avoid
- Using insufficient sub-base depth
- Not compacting properly
- Skipping the sub-base entirely
- Using unsuitable materials
What Materials Are Used for a Sub-Base?
Common sub-base materials include:
- MOT Type 1
- Crushed stone
- Hardcore aggregates
These materials provide strength and stability when compacted correctly.
Conclusion
The correct sub-base depth is essential for ensuring driveways and patios remain stable and durable over time. Using the right materials and compacting them properly will help prevent movement, cracking, and costly repairs in the future.
Call to Action
Browse our range of aggregates or contact our team for advice on choosing the right sub-base materials for your project.
Introduction
A strong and properly installed sub-base is essential for any driveway or patio project. The correct sub-base depth helps prevent sinking, cracking, and movement over time. In this guide, we explain how deep a sub-base should be for different projects and why proper preparation is important.
What is a Sub-Base?
A sub-base is the layer of compacted material installed beneath a driveway, patio, or paved surface. It provides strength, stability, and drainage while supporting the finished surface above.
MOT Type 1 is one of the most commonly used sub-base materials in the UK.
Recommended Sub-Base Depth for Driveways
For domestic driveways, the recommended compacted sub-base depth is usually:
- 100–150mm for cars and light vehicles
- Deeper for heavier vehicles or poor ground conditions
A stronger sub-base improves load distribution and helps extend the lifespan of the driveway.
Recommended Sub-Base Depth for Patios
Patios generally require a slightly shallower sub-base compared to driveways.
Typical depth:
- 75–100mm compacted depth
This provides enough support for paving slabs while maintaining good drainage.
Why Proper Compaction Matters
Even with the correct depth, poor compaction can cause future problems such as sinking or uneven surfaces. The sub-base should be compacted in layers using suitable equipment.
Common Mistakes to Avoid
- Using insufficient sub-base depth
- Not compacting properly
- Skipping the sub-base entirely
- Using unsuitable materials
What Materials Are Used for a Sub-Base?
Common sub-base materials include:
- MOT Type 1
- Crushed stone
- Hardcore aggregates
These materials provide strength and stability when compacted correctly.
Conclusion
The correct sub-base depth is essential for ensuring driveways and patios remain stable and durable over time. Using the right materials and compacting them properly will help prevent movement, cracking, and costly repairs in the future.
Call to Action
Browse our range of aggregates or contact our team for advice on choosing the right sub-base materials for your project.