artificial grass has become a popular alternative to natural lawns because of its low maintenance and year-round green appearance. However, one of the most important factors in ensuring a long-lasting and functional installation is proper drainage. Without an effective drainage layer, synthetic turf can accumulate water, cause unpleasant odors, and damage the base structure. This guide explains what to put under artificial grass for drainage, along with tips for choosing the right materials.
Artificial turf does not absorb water like natural grass. Instead, water flows through the perforated backing into the base layer. If the wrong materials are used, water will pool on the surface, leading to problems such as:
Flooding and waterlogging
Mold and mildew growth
Uneven surfaces or turf damage
Bad smells, especially in pet areas
That’s why selecting the right base materials under synthetic grass is essential for effective drainage.
Using crushed stone (often granite or limestone) or gravel is one of the most common solutions. These aggregates create a solid yet permeable foundation, allowing water to pass through quickly.
Recommended size: 10–20mm stones
Benefits: Strong support, excellent drainage, prevents shifting
A thin layer of sharp sand is often added on top of the crushed stone base. It helps smooth the surface and provides a stable ground for the artificial turf.
Benefits: Easy leveling, enhances turf stability
Note: Avoid fine sand as it may block water flow
A geotextile weed barrier is placed under or above the base material. It prevents weeds from growing while still allowing water to pass through.
Benefits: Controls weed growth, keeps drainage free
For patios, rooftops, or concrete areas, drainage grids or panels can be installed. These elevate the turf and create airflow, ensuring proper water runoff.
Benefits: Ideal for artificial grass on concrete, prevents puddles
Unlike traditional MOT Type 1, MOT Type 3 sub-base is made of larger aggregates that are more permeable. It is recommended for high-rainfall areas or heavy-use surfaces.
Benefits: Superior drainage, long-lasting stability
Slope the Base: A slight gradient (around 2%) ensures rainwater flows away naturally.
Avoid Clay Soil: Clay holds water and should be replaced or improved with gravel.
Check Permeability: Always test the area before installation by pouring water to ensure it drains properly.
Pet-Friendly Turf: If you install artificial grass for dogs, prioritize drainage materials to prevent odor build-up.
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