How to stop block paving sinking

If you’ve noticed dips, uneven surfaces, or pooling water, you’re not alone. Block paving sinking is a common issue for homeowners across the UK. But the good news is, it’s fixable and preventable.

In this guide, we’ll explore how to stop block paving sinking, what causes it, and how to ensure your driveway stays level and long-lasting.

Block paving is a common issue for homeowners across the UK.

How to stop block paving sinking

If you’re wondering exactly how to stop block paving sinking, the solution lies in both repair and prevention.

1. Lift and relay the affected area

For existing damage, the best fix is to:

Remove the sunken blocks
Re-level the bedding sand
Compact the sub-base properly
Relay the blocks evenly

This is the most effective way to stop block paving sinking long-term.

2. Strengthen the sub-base

A solid foundation is key. When reinstalling:

Use at least 100–150mm of MOT Type 1
Compact in layers using a plate compactor

A properly installed base will prevent future block paving driveway sinking.

A solid foundation for your block paving is key.

3. Improve drainage

To avoid block paving sinking around drain areas:

Ensure drains are clear and functioning
Install proper fall (a slight slope) to direct water away
Consider adding drainage channels if needed

Good drainage is essential to stop block paving sinking over time.

4. Refill and compact jointing sand

Jointing sand helps lock the blocks in place. Re-sanding and compacting:

Prevents movement
Reduces the risk of sinking block paving

This is a simple maintenance step that makes a big difference.

Jointing sand helps lock the blocks in place.

5. Seal the surface

Applying a block paving sealant:

Protects against water ingress
Helps stabilise jointing sand
Extends the lifespan of your driveway

It’s an effective way to help stop block paving sinking in the future.

Preventing block paving from sinking

Prevention is always better than repair. Here’s how to avoid block paving sinking altogether:

Always invest in professional installation or follow best practices
Ensure a deep, well-compacted sub-base
Maintain proper drainage systems
Avoid consistently parking heavy vehicles in the same spot
Regularly inspect for early signs of movement

Applying a block paving sealant protects against water ingress.

Final thoughts

Dealing with block paving sinking can be frustrating, but it’s rarely a lost cause. By understanding why block paving sinks and taking the right steps, you can restore your driveway and prevent future issues.

Whether you’re tackling block paving sinking around a drain or general unevenness, the key is a strong foundation, proper drainage, and regular maintenance.

If you have any more questions about block paving or you just need additional information about the products we sell at Howarth, please visit your local Howarth branch, or contact us today on our customer services on 01472 907051.