Installing artificial grass can give you a green, low-maintenance lawn year-round, but without proper drainage underneath, it can quickly turn into a soggy, smelly mess. Poor drainage can lead to standing water, mold growth, and unpleasant odors, especially after heavy rain or regular use.
To get the best results and longest life from your turf, it’s important to build a solid base that allows water to drain efficiently. In this guide, we’ll cover what to put under artificial grass for drainage, compare different base materials, and share tips to help you avoid common mistakes.
Why Proper Drainage Matters
- Prevents Water Pooling – Without drainage, water can collect on the surface, leading to puddles and soggy spots that are messy and unsafe.
- Reduces Slip Hazards and Surface Damage – Standing water can create slippery areas and cause the turf to shift or wear out faster.
- Avoids Odor and Bacteria Build-Up – Moisture trapped under the turf can lead to unpleasant smells and encourage the growth of bacteria or mold.
- Protects the Lifespan of Your Turf – A well-drained base helps prevent damage to the turf’s backing and infill, keeping your synthetic lawn looking like natural grass great for years.
What to Put Under Artificial Grass for Drainage
Key Base Materials for Drainage
Choosing the right base materials is essential for keeping your artificial synthetic grass dry, clean, and long-lasting. These materials create a solid foundation that lets water flow through while supporting the turf above.
- Crushed Granite (Decomposed Granite): Compacts firmly and offers excellent drainage. Ideal for areas with moderate to heavy foot traffic.
- Class II Road Base: A mix of crushed stone and fine particles. Provides a strong, compact foundation but may need extra attention for drainage.
- Crushed Limestone: Offers great drainage and weed resistance. A durable option, though potentially more expensive.
- Gravel and Aggregate Mixes: Combine larger stones with smaller particles for drainage and structural support.
- Sand (Used Cautiously): Helps level a surface but drains poorly and may shift. Best used as a light top layer only.
Optional Layers
- Geotextile Fabric: Placed between soil and base to block weeds and help water filter through.
- Drainage Mats: Synthetic layers that efficiently channel water. Great for rooftops or hard surfaces.
How to Install a Drainage-Ready Base
A strong base is the key to making sure your artificial grass drains well and stays in great shape over time. With a little planning and the right materials, you can build a base that prevents water problems and supports your turf for years to come.
Step-by-Step Guide
- Excavate and Prepare the Area: Remove soil to about 3–4 inches deep. Grade slightly for natural drainage.
- Install the Base Material: Spread base (e.g., crushed granite) 2–3 inches deep. Level and compact it firmly.
- Add Optional Drainage Enhancements: Lay geotextile fabric or drainage mats to filter water and block weeds.
- Lay the Artificial Turf and Infill: Roll out turf, trim, secure, and add infill to support the blades and drainage.
Common Mistakes to Avoid
- Don’t use the wrong base—opt for well-draining, stable materials.
- Always compact the base to prevent uneven areas.
- Ensure a slight slope to let water flow off the surface.
Special Considerations
Installing Artificial Turf Over Concrete or Pavers
Concrete or paver installations require added drainage layers. Use drainage tiles or perforations to let water escape. A layer of crushed stone or drainage mat also helps prevent pooling.
Dealing with High Rainfall Areas
In heavy rain zones, enhance drainage with French drains or perforated pipe systems beneath the turf to quickly remove water and keep your lawn usable.
Maintenance Tips to Preserve Drainage
- Clean regularly to remove leaves, dirt, and debris.
- Check for pooling after rain to catch issues early.
- Re-level low spots to ensure water flows correctly.
Conclusion
Choosing the right base for your existing grass is just as important as the turf. A well-built foundation ensures proper drainage, prevents issues like pooling and odor, and keeps your lawn attractive and low-maintenance for years.
With the right materials and smart planning, you can enjoy a clean, durable outdoor space that looks great year-round. Ready to get started? Contact Stabuilt Pavers today for expert artificial grass installation backed by quality craftsmanship and local experience.