The Art of Block Paving: Digging Deep for a Solid Foundation

Block paving is a popular choice for driveways, patios, and pathways, thanks to its durability and aesthetic appeal. But before you can lay those beautiful blocks, you need to dig deep and create a solid foundation. In this article, we’ll explore the typical excavation depth for block paving and the steps involved in creating a sturdy base.

The Excavation Process

When it comes to block paving, the excavation depth is crucial for ensuring a long-lasting and stable surface. The general rule of thumb is to excavate 200-250 mm below the finished paving level. This depth allows for the following layers:

• Sub-base: 100-150 mm
• Sand bed: 40 mm
• Block or brick: 50 mm

By excavating to this depth, you create enough space for a solid sub-base, a sturdy sand bed, and the block or brick itself.

Creating the Foundation

Once the excavation is complete, it’s time to create a solid foundation for your block paving. There are a couple of methods you can use:

1. Concrete Foundations

One option is to create concrete foundations for your paving. This involves pouring a layer of concrete that comes up to 3 cm beneath the desired finished level. Here’s how you can do it:

1. Mark the desired finished level using a string or marker.
2. Create 10 cm concrete foundations, ensuring that they are level and slope away from any structures to allow for proper drainage.
3. Sit the edging stones on top of the concrete foundations.
4. Using a mallet, lightly hammer the edging stones down to the level of the string.

This method provides a solid and level foundation for your block paving, ensuring that it stays in place for years to come.

2. Cement and Ballast Mix

Another option is to create a concrete foundation using a mix of cement and ballast. Here’s how you can do it:

1. Mix 1 part cement with 6 parts ballast.
2. Create a concrete foundation that is 100 mm thick in depth.
3. Ensure that the foundation is level and slopes away for proper drainage.
4. Place the edging stones on top of the concrete foundation.
5. Use a mallet to lightly hammer the edging stones down to the desired level.

This method offers a cost-effective alternative to using solely concrete foundations, while still providing a solid base for your block paving.

Conclusion

When it comes to block paving, a solid foundation is key to achieving a durable and visually appealing surface. By excavating to the appropriate depth and creating a sturdy base using either concrete foundations or a cement and ballast mix, you can ensure that your block paving stands the test of time.

So, the next time you embark on a block paving project, remember to dig deep and lay the groundwork for a stunning and long-lasting result!