Choosing the right sand for laying driveable pavers is crucial to ensure the stability, durability, and effectiveness of your outdoor layout. Sand plays a central role in both the preparation of the base, the laying bed, and the joints between the pavers.
Types of Sand for Laying Driveable Pavers
Crushed Sand: Crushed sand, also known as crusher sand, is a preferred choice for the base and laying bed of driveable pavers. Its coarse granulation and angular edges allow for better compaction, providing a solid and stable base capable of supporting heavy loads.
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Concrete Sand: Concrete sand, or river sand, is also used for base preparation. Its well-balanced granulation composition allows for good compaction and effective drainage. However, it is often mixed with crushed sand to enhance its stability.
Polymer Jointing Sand: For the joints between the pavers, polymer sand is recommended. This sand contains additives that, when wet, harden and create a strong bond between the pavers, preventing weeds from growing and reducing the movement of pavers under the pressure of vehicles.
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Base Preparation
The base is the foundation on which the driveable pavers rest. It must be solid and well-drained to avoid settling and instability issues.
Foundation Layers: Preparation begins with excavating the area to be paved, followed by laying several layers of foundation materials. The first layer is generally made of crushed gravel, about 20 to 30 centimeters thick, well compacted. On top of this layer, a second layer of crushed sand or concrete sand is added, with a thickness of 5 to 10 centimeters, and well compacted.
Compaction: Each layer of foundation material must be carefully compacted using a vibrating plate. Adequate compaction ensures a solid base, reducing the risks of settling and sinking under the weight of vehicles.
Laying Bed
The laying bed is the layer of sand on which the pavers are directly placed.
Crushed Sand: For the laying bed, crushed sand is often used due to its drainage and compaction properties. A layer of about 3 to 5 centimeters of crushed sand is generally sufficient.
Leveling: It is crucial to properly level the laying bed to ensure an even surface for the pavers. Use a straightedge and guide rails to achieve a flat and regular surface.
Joints Between the Pavers
Jointing is the final step in laying the pavers. It ensures the stability of the pavers and prevents weeds from growing between them.
Polymer Sand: Polymer sand is ideal for the joints between driveable pavers. After being swept into the joints, it must be moistened to activate the polymers that harden and bind the sand grains together. This creates a solid surface that resists the movement of the pavers and the growth of weeds.
Application: Pour the polymer sand over the pavers and sweep it to fill the joints. Then, use a vibrating plate to compact the pavers and the sand, and lightly mist the joints with water to activate the polymer sand.
Maintenance
Jointing sand, although stabilized, may require periodic reapplications to maintain the integrity of the joints. Regularly check the joints and add polymer sand as needed to maintain a stable and even surface.