Even though artificial grass is water-permeable, the subbase should have a slight slope—usually around 1–2%, which is 1–2 cm per meter. During heavy rain, this allows water to drain off the surface or via the drainage mat.
What you should look out for
- Always drain away from the building
- Use the existing slope on balconies and terraces to direct water to the drain
- Avoid hollows and depressions when leveling the base layer
A properly planned slope is part of every professional subbase. Find out more in our installation guide.
