Before laying artificial grass, you need to prepare a solid and stable base to ensure a long-lasting and aesthetically pleasing result. This typically involves several layers:
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Weed Membrane (Geotextile Fabric): This is the first layer, placed directly on top of the existing soil after removing any existing grass or vegetation. Its purpose is to prevent weeds from growing through the artificial grass.
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Sub-Base (Crushed Aggregate): A compacted layer of crushed aggregate, such as MOT Type 1 or similar, provides a stable and well-draining foundation. This layer is usually 50-100mm (2-4 inches) thick.
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Levelling Layer (Granite Dust/Sharp Sand): A thin layer of fine material, such as granite dust or sharp sand, is spread over the sub-base. This provides a smooth and even surface for the artificial grass to sit on and helps to prevent any unevenness or bumps. This layer is usually around 25mm (1 inch) thick.
Here's a breakdown in a table:
| Layer | Material | Thickness (Approximate) | Purpose |
|---|---|---|---|
| Weed Barrier | Geotextile Fabric | Thin | Prevents weed growth |
| Sub-Base | Crushed Aggregate (e.g., MOT Type 1) | 50-100mm (2-4 inches) | Provides a stable and well-draining foundation |
| Levelling Layer | Granite Dust/Sharp Sand | 25mm (1 inch) | Creates a smooth and even surface for the artificial grass |
Why are these layers important?
- Weed Prevention: Without a weed membrane, weeds will grow through the artificial grass, ruining its appearance and potentially damaging it.
- Drainage: The sub-base allows water to drain away quickly, preventing the artificial grass from becoming waterlogged.
- Stability: The sub-base and levelling layer provide a stable and level surface, preventing the artificial grass from sinking or becoming uneven over time.
- Smooth Surface: The levelling layer ensures a smooth finish, making the artificial grass more comfortable to walk on and more aesthetically pleasing.
In summary, you need to put down a weed membrane, a sub-base of crushed aggregate, and a levelling layer of granite dust or sharp sand before installing artificial grass. These layers create a solid, stable, and well-draining foundation, ensuring a long-lasting and beautiful artificial lawn.
