Pouring concrete over block paving is feasible and can be done effectively if certain steps are followed to ensure a stable and durable surface. Here’s a step-by-step guide on how to achieve this:
1. Assess the Block Paving
– Condition: Check the condition of the existing block paving. Ensure there are no loose blocks, major gaps, or signs of instability.
– Levelness: Make sure the surface is level. Uneven surfaces can cause the concrete to crack or settle unevenly.
2. Clean the Surface
– Debris Removal: Remove all debris, dirt, and vegetation from the block paving.
– Power Wash: Use a power washer to thoroughly clean the surface, ensuring good adhesion of the concrete.
3. Prepare the Block Paving
– Filling Gaps: Fill any large gaps or holes in the paving with a sand-cement mixture. This helps to prevent the concrete from seeping through.
– Compaction: Compact the block paving to ensure it is stable and will not shift under the weight of the concrete.
4. Install a Bonding Agent
– Bonding Agent: Apply a bonding agent to the block paving. This helps the new concrete adhere better to the old surface.
5. Lay a Reinforcement Mesh
– Rebar or Wire Mesh: Place a reinforcement mesh over the block paving. This will add strength to the concrete slab and help prevent cracking.
6. Formwork Installation
– Formwork: Install formwork around the area where you will be pouring concrete. This keeps the concrete in place until it cures.
7. Pour the Concrete
– Concrete Mix: Use an appropriate concrete mix suitable for the intended use of the floor.
– Pouring: Pour the concrete over the block paving, ensuring even distribution.
– Levelling: Use a screed to level the concrete surface. Make sure to work quickly before the concrete starts to set.
– Finishing: Smooth the surface using a trowel or float to achieve the desired finish.
8. Curing
– Curing: Allow the concrete to cure properly. This usually involves keeping the surface moist and covered for several days to prevent rapid drying and cracking.
9. Final Inspection
– Inspection: Once the concrete has cured, inspect the surface for any issues such as cracks or uneven areas and address them accordingly.
Additional Considerations
– Drainage: Although the floor is undercover, consider if there’s any risk of water pooling. Ensure the concrete has a slight slope for drainage, if necessary.
– Thickness: Ensure the new concrete layer is thick enough to provide the desired durability. Typically, a minimum of 2-3 inches is recommended, but this can vary based on specific needs.
By following these steps, you can successfully pour concrete over block paving, creating a solid and stable surface suitable for various uses. If you’d like to know more or need help with your project, visit and contact us here.
