Laying Concrete Blocks Without Mortar: A Comprehensive Guide

When it comes to laying concrete blocks for your unbound driveway, there are several steps you need to follow to ensure a successful installation. Laying concrete blocks without mortar is a popular choice among homeowners due to its simplicity and cost-effectiveness. However, it requires careful planning and execution to achieve the desired results.

Step 1: Compaction

The first step in laying concrete blocks without mortar is compaction. This involves ensuring that the paving is compact and stabilised to prevent settling or shifting over time. You can use a plate compactor or a hand tamper to achieve this.

Step 2: Jointing

Once the paving is compacted, you need to joint it using kiln-dried sand. This will help fill in any gaps between the blocks and prevent weeds from growing through.

Step 3: Cutting

Cutting is another important step in laying concrete blocks without mortar. You'll need to cut and fit blocks to complete any gaps in the paving.

Step 4: Laying the Blocks

The next step is to lay the concrete blocks in your desired pattern. Make sure to leave space for drainage channels and edge restraints.

Step 5: Sand Screed

After laying the blocks, you'll need to apply a sand screed to the laying course. This involves spreading slightly damp sharp sand over the surface of the paving.

Step 6: Drainage Channels

If your driveway requires drainage channels, now is the time to lay them. Ensure that they are positioned correctly and at the right level to allow water to flow freely.

Step 7: Sub-Base

The sub-base layer provides a solid foundation for your concrete blocks. You'll need to compact and lay this layer to ensure it's stable and even.

Step 8: Wait 24 Hours

Before laying edge restraints, you'll need to wait for 24 hours to allow the sub-base to settle and cure.

Step 9: Edge Restraints

Edge restraints are an essential part of laying concrete blocks without mortar. They help keep the paving in place and prevent it from shifting or moving over time.

Step 10: Mortar & Concrete Mix

You'll need a 5:1 mortar mix to lay your edge restraints. You may also need another batch for any drainage channels you're installing.

Step 11: Excavation

Before laying the concrete blocks, you'll need to excavate the driveway area to the correct depth and width.

Step 12: Measurement and Marking

Finally, take measurements of your driveway and mark out the area to ensure you have enough material for the entire installation.

In addition to these steps, there are several considerations to keep in mind when laying concrete blocks without mortar. For example, if your paved area is greater than 5m², you'll need to include in-boundary rainwater capture or drainage to comply with environmental and planning regulations.

By following these steps and considering the additional factors, you can successfully lay concrete blocks without mortar for your unbound driveway installation.