“What to Put Under Turf Before Laying?” You are planning to install artificial grass in your garden or back yard, really? Well, it will always give you that luscious green lawn minus the constant watering and trimming. But before you start spreading the turf, you should know one very important thing- underneath the surface, which is what matters most.

Without the right base, your artificial grass could sink, look uneven, or develop drainage issues. In this complete guide, we’ll explain exactly what to put under turf before laying, how deep the layers should be, and what common mistakes to avoid.

Why Ground Preparation Is So Important Before Laying Turf:

Preparing the ground beneath artificial turf isn’t optional—it’s the foundation of a long-lasting installation.

When you properly prepare the base, you’ll get:

• A smooth and even surface
• Proper drainage to avoid water buildup
• A turf that stays in place for years
• No weed growth pushing through
  

Skipping ground prep may lead to early wear and tear, puddles, odors, or sinking spots in your lawn.

What to Put Under Turf Before Laying? Step-by-Step Guide!

Installing turf is certainly more than just rolling out a carpet; it involves the clean base material used and the installation order. Let us now take a closer look at each of the layers.

1. Remove the Existing Surface (Grass, Weeds, Soil):

Before you lay anything, clear everything. That means:

• Stripping off natural grass
• Pulling out all weeds
• Removing stones, roots, and loose soil
  

Use a turf cutter if needed, and dig down around 100mm to prepare for your base layers.

2. Install a Sub-Base Using Type 1 MOT or Crushed Limestone:

This is the most important layer.

The sub-base gives your turf structure, support, and drainage. Most professionals recommend:

• MOT Type 1 Hardcore
• Crushed Limestone
• Granite Dust (for better drainage in wet areas)
  

Spread it out to a depth of 50–100mm and compact it well using a vibrating plate compactor.

👉 Tip: Compact in layers if going over 75mm.

3. Spread a Layer of Sharp Sand:

The next step is to add sharp sand to smooth the surface and create a soft layer for the turf to sit on.

Why sharp sand?

• It allows water to pass through
• It helps level the area
• It cushions the turf without making it unstable
  

The thickness of the layer should be 20-30 mm and compacting it shortly after raking would do well. Builder’s sand should be avoided; it clumps and is moisture-retaining, thus causing drainage problems

4. Lay a Weed Membrane or Weed Barrier:

No one wants weeds pushing through their artificial lawn. That’s where a weed control membrane comes in.

Place it on top of the sharp sand (or underneath if you’re in a high-wind area) to:

• Block weed growth
• Allow rainwater to drain naturally
• Keep the turf clean and low-maintenance
  

Pin it in place using landscaping staples or nails around the edges.

5. (Optional) Add a Foam Shock Pad for Comfort and Safety:

If kids or pets will be using the space often—or if you just want a softer, more cushioned feel—installing a foam shock pad is a great idea.

Benefits of shock pads:

• Softer underfoot feel
• Impact protection for children’s play
• Reduces strain on knees and joints
  

Thickness options: 10mm to 25mm, depending on how much softness you want.

Can You Lay Artificial Grass on Soil Only?

Technically yes—but it’s not a good idea. Laying turf directly on soil may cause:

• Uneven surfaces as the soil shifts
• Drainage issues leading to standing water
• Weed regrowth through the turf
• A short turf lifespan
  

If you want a flat, safe, and long-lasting result, always install a proper base.

What Should I Put Under Turf for Better Drainage?

Water access is an effective technique for growing good grass. 

Use:

• Granite dust instead of sharp sand if you live in wet climates
• MOT Type 1 base for general use
• A slight slope (1–2%) to direct water away
• Perforated drainage pipes for extra-heavy use areas
  

How Deep Should the Layers Be Under Artificial Grass?

Here’s the ideal depth breakdown:

• Excavation depth: 100–150mm total
• Sub-base (MOT Type 1): 50–100mm
• Sharp sand or granite dust: 20–30mm
• Turf layer: 20–40mm (depending on pile height)
• Shock pad (optional): 10–25mm

👉 Total base depth (excluding turf): 70–130mm

Common Mistakes to Avoid When Laying Turf:

Here are some mistakes that can ruin your turf project:

• Using soft topsoil instead of a solid base
• Skipping the compaction step
• Laying turf on uneven ground
• Forgetting to install a weed membrane
• Using builder’s sand (holds water, causes smells)
  

 

Benefits of a Proper Turf Base Preparation:

Long-Term Durability – Avoid sagging, wrinkles, or turf lifting over time
Weed-Free Lawn – Weed membranes keep growth underneath under control
Smooth and Safe Surface – Great for children, pets, and outdoor activities
Better Drainage – Prevent puddles, mud, and standing water
Low Maintenance – A solid base means fewer fixes and touch-ups later

FAQs:

Q1. Can I use gravel as a sub-base for artificial grass?

Yes, they need to be condensed and topped with finer material like stone-blasting grit or fine sand.

Q2. Do I need to water artificial grass once laid?

 No. Artificial grass doesn’t need watering unless you’re cleaning it.

Q3. Is a weed barrier necessary under turf?

 Yes, it helps stop weeds from growing through and keeps your lawn low-maintenance.

Q4. Can I use sand only as the base for artificial grass?

 No. Sand alone is unstable and doesn’t support drainage well. Always use a compacted sub-base first.

Q5. How long will artificial turf last with the right base?

 With proper prep, it can last 15–20 years depending on use and quality.

Conclusion:

Artificial turf installation is not only choosing the right grass; it’s laying the right foundation. Soils will be taken away, compacted sub-bases will be put in, sharp sands spread, and weed membranes laid down. Each layer helps keep your lawn level, strong, and beautiful. Put in the time to make the base right, and you will enjoy a green, hassle-free lawn for years to come.