How to Repair Sunken Corners on Block Paving

Block paving is a popular choice for driveways and patios due to its durability and attractive finish. However, over time, you might notice certain areas starting to dip or sink – particularly in the corners. This is a common issue caused by soil movement, poor drainage, or heavy traffic, but fortunately, it is fixable. LGC Driveways & Patios explains how sunken corners on block paving can be repaired effectively to restore the strength and appearance of your driveway or patio.

Understanding Why Block Paving Sinks

Before any repair work begins, it is important to identify the root cause of the problem. Common reasons include:

• Poor Sub-Base Preparation – If the sub-base was not compacted properly during installation, it can settle unevenly over time.
  
• Drainage Issues – Excess water can wash away bedding sand, causing blocks to lose their support.
  
• Heavy Vehicle Loads – Consistent weight in the same area can lead to depressions.
  
• Natural Ground Movement – Seasonal weather changes can cause soil to expand and contract, affecting stability.
  

By addressing the underlying issue, you can prevent the problem from recurring.

Step-by-Step Process to Repair Sunken Corners

1. Remove the Affected Blocks

The first step is carefully lifting the sunken blocks using a block puller or flat tool. Keeping the blocks intact allows them to be reused, maintaining the appearance of your driveway.

2. Excavate and Inspect the Base

Once the blocks are removed, the underlying bedding sand and sub-base are inspected. Any compromised or washed-out material should be removed and replaced.

3. Rebuild the Sub-Base

A strong, compacted sub-base is crucial for preventing future sinking. Fresh MOT Type 1 aggregate is typically laid and compacted in layers to provide a stable foundation.

4. Re-Sand and Re-Lay the Blocks

A fresh layer of sharp sand is levelled before the blocks are re-laid in their original pattern. This ensures the repaired section blends seamlessly with the surrounding paving.

5. Compact and Finish

Finally, the repaired section is compacted using a plate compactor and fresh kiln-dried sand is brushed into the joints. This locks the blocks firmly back into place and provides a smooth, even surface.

Why Professional Repairs Are Recommended

Although DIY repairs are possible, professional intervention is often the best approach for long-lasting results. LGC Driveways & Patios ensures the sub-base is rebuilt correctly, drainage issues are addressed, and the finished surface is completely level. This saves homeowners time and prevents repeat problems.

Preventing Future Sinking

After repairs are complete, you can reduce the likelihood of future sinking by:

• Keeping drainage channels clear to prevent water pooling.
  
• Avoiding excessive loads on the corners of the paving.
  
• Scheduling regular maintenance to spot early signs of movement.
  

Conclusion

Sunken corners can make a block-paved driveway or patio uneven and unsightly, but with the right repair process, they can be restored to their original condition. LGC Driveways & Patios in Letchworth Garden City provides professional block paving repairs that ensure a durable, level finish that lasts for years.

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