After laying the sub-base for paving slabs or interlocking blocks, a 30mm thick sand bedding layer is meticulously screeded and tamped across the pavement area. The slabs are then laid horizontally, maintaining 2-3mm wide joints and ensuring an uphill direction for optimal drainage. Once the laying is complete, sand is spread over the surface and meticulously brushed into the joints, ensuring complete filling. Plate vibrators are then employed to settle the slabs into their final positions.
This sand layer serves dual functions, akin to the blinding layer used under concrete structures:
- Levelling and Flattening: The sand bedding provides a uniform and level surface for the placement of paving slabs or interlocking blocks. This ensures proper alignment and a smooth finish for the pavement.
- Protection: The sand layer acts as a protective barrier, shielding the underlying subgrade and sub-base from adverse weather conditions during the installation process. This safeguards the foundation’s integrity and prevents potential damage caused by rain, frost, or other environmental factors.
By fulfilling these essential roles, the sand layer contributes significantly to the successful installation and long-term performance of paving slabs or interlocking blocks, ensuring a durable and aesthetically pleasing pavement.