If you’re considering laying block paving on top of existing concrete, you might be wondering if it’s possible. The short answer is yes, it is possible to lay block paving on concrete. However, there are a few things to consider before you start the project.
Firstly, it’s important to ensure that the concrete base is in good condition. If there are cracks or other damage, it may be necessary to repair or replace the concrete before laying the block paving. Additionally, the concrete should be level and free from any debris or loose material. This will provide a solid foundation for the block paving and ensure that it remains stable over time.
Assessing the Existing Concrete Base
If you’re planning to lay block paving on concrete, it’s essential to assess the existing concrete base thoroughly. This will help you determine whether the base is suitable for paving and identify any preparation requirements.
Suitability for Paving
The first thing you need to consider is whether the concrete base is suitable for paving. In general, concrete is a good base for block paving, but there are a few things to keep in mind. Firstly, the concrete must be level and stable. If the concrete is uneven or unstable, it will affect the final result of your block paving.
Secondly, you need to check the drainage of the concrete base. If the base doesn’t have adequate drainage, water can pool underneath the block paving, causing damage over time. You can test the drainage by pouring water onto the concrete and observing how quickly it drains away.
Condition Assessment
The next step is to assess the condition of the concrete base. Look for any cracks, holes, or other damage that could affect the stability of the block paving. If you notice any damage, you’ll need to repair it before laying the block paving.
Preparation Requirements
Finally, you need to identify any preparation requirements for the concrete base. This may include cleaning the surface of the concrete, removing any debris or vegetation, and applying a weed killer to prevent weeds from growing through the block paving.
In addition, you may need to apply a primer to the concrete to improve the adhesion of the block paving. This is particularly important if the concrete is smooth or has been sealed.
Overall, assessing the existing concrete base is an essential step in laying block paving. By taking the time to assess the suitability of the base, identify any damage, and prepare the surface properly, you can ensure a stable and long-lasting result.
Laying Block Paving on Concrete
Materials and Tools Needed
Before you start laying block paving on concrete, you will need to gather the necessary materials and tools. Here is a list of what you will need:
- Block paving bricks
- Sand
- Cement
- Paving sealer
- Jointing sand
- Trowel
- Rubber mallet
- Spirit level
- Tape measure
- String line
- Chalk line
- Safety goggles
Installation Process
To lay block paving on concrete, follow these steps:
- Prepare the surface: Clean the concrete surface thoroughly and remove any debris or loose material. If there are any cracks or holes in the concrete, fill them with a suitable filler and allow it to dry completely.
- Apply a layer of sand: Spread a layer of sand over the concrete surface to create a bed for the block paving. Make sure the sand is level and smooth.
- Lay the block paving: Start laying the block paving from one corner of the surface. Use a string line to ensure the blocks are straight and level. Tap each block into place with a rubber mallet.
- Fill the gaps: Once all the blocks are laid, fill the gaps between them with jointing sand. Brush the sand into the gaps and compact it with a trowel.
- Seal the surface: Apply a paving sealer to the surface to protect it from the elements and to enhance its appearance.
Finishing Touches
To ensure a professional finish, follow these tips:
- Use a spirit level to ensure the blocks are level and even.
- Cut the blocks to fit around any obstacles or edges using a saw or chisel.
- Use a chalk line to mark out the pattern of the block paving before you start laying it.
- Wear safety goggles when cutting the blocks to protect your eyes from flying debris.
By following these steps, you can lay block paving on concrete and create a durable and attractive surface for your driveway or patio.
