Overview

In this blog, our artificial grass experts at Great American Green Inc. will dig into what’s happening underneath your artificial turf and explain why proper preparation and installation are so important to creating a durable, well-performing surface that protects your property for years to come.

Introduction

Artificial turf may look like something you can simply roll over your existing surface, but a quality installation requires much more preparation. Most of the work happens before the turf itself ever goes down.

Excavation, grading, base preparation, compaction, drainage, and finishing details all affect how the surface looks and performs. So, what exactly goes underneath artificial turf, and why do those hidden layers matter? Let’s take a closer look.

What Happens to the Ground Before Artificial Turf Is Installed?

Before artificial turf can transform your yard, the ground underneath needs some serious attention. Your existing lawn isn’t just an empty surface waiting to be covered. It contains living vegetation, soil, roots, slopes, and drainage patterns that all influence how water moves and how stable the finished surface will be.

That’s why professional installation starts from the ground up. Preparing the site creates room for a stable turf system, helps manage water effectively, and provides the new surface with the support it needs to remain smooth and perform well over time.

Why Does Existing Grass Need To Be Removed?

Artificial turf isn’t installed by just flattening your lawn and rolling a green surface over it. Natural grass has roots and organic material underneath. Covering and leaving that material can trap moisture, causing decomposition, mold, and issues like movement, soft spots, bad odors, or uneven areas.

Removing the grass and other organic material gives installers a clean, more predictable starting point. It also creates space for the nonorganic base materials that will take over some of the functions the existing ground performed, including supporting the surface and helping water move through the installation.

How Deep Does the Ground Need To Be Excavated?

Excavation sounds dramatic, but there’s a practical reason for it: the new turf system needs somewhere to go. For many residential installations, roughly 3 to 4 inches of existing material may be removed, although the exact depth depends on the site, soil conditions, intended base, drainage needs, and desired finished height. Some installations may require more or less preparation.

That extra depth allows for a compacted aggregate base without leaving the finished turf sitting awkwardly above patios, walkways, edging, or other landscaping. A professional site assessment helps determine how much material needs to be removed so the finished lawn sits at the right elevation and has adequate support beneath it.

What Does Proper Grading Do for Your Lawn?

A yard may look relatively flat at first glance, but small changes in elevation can make a big difference once rain starts falling. Grading shapes the prepared ground so that the finished turf has a smooth foundation and water has a suitable path to follow rather than collecting in unwanted areas.

Proper grading can help:

Direct water away from buildings and other structures
Reduce low spots where water could collect
Create smoother transitions near patios and walkways
Establish an even foundation for the turf system
Shape intentional contours for putting greens or specialty areas

Think of grading as setting the stage before the main attraction arrives. Once the land has the right shape and slope, installers can start building the supportive base that will sit directly beneath your new artificial turf.

What Kind of Base Goes Under Artificial Turf?

Once the existing lawn has been cleared and the ground has been shaped, it’s time to build the foundation your artificial turf will actually rest on. This base may disappear from view when the job is finished, but it has a big influence on stability, drainage, and how the surface feels underfoot.

The right materials, installed and compacted correctly, help create a smooth surface that can handle everyday use without shifting or settling.

What Is an Artificial Turf Base Made Of?

Artificial turf typically sits over a compacted layer of crushed aggregate rather than loose dirt or ordinary gravel. Depending on the project and local materials, installers may use crushed stone, road base, decomposed granite, or a combination of aggregates designed to compact tightly while still allowing water to move through the system.

The secret is in the shape and size of the material. Angular pieces of crushed rock lock together when compacted, while smaller particles fill the spaces between them. That combination creates a firm, relatively smooth foundation that can support the turf without behaving like a bed of loose pebbles every time someone walks across it.

Why Does the Base Need To Be Compacted?

Dumping crushed stone into the excavated area isn’t enough. The material needs to be thoroughly compacted so that those pieces settle and lock together into a stable foundation.

Proper compaction helps:

Reduce shifting beneath the turf
Prevent dips and uneven areas from developing
Create a firmer surface for foot traffic
Support smoother seams and transitions
Maintain the intended grade for drainage
Provide consistent support across the installation

Without sufficient compaction, loose base material can continue to settle after the turf is installed. That movement may eventually show through at the surface as depressions, ripples, or uneven spots. A well-compacted base gives the turf a much more dependable surface to land on.

How Does the Base Affect How Artificial Turf Feels?

The turf fibers may be what your feet touch, but the foundation beneath determines how the lawn feels. A smooth, properly compacted base provides consistent support, helping the turf feel firm and even instead of soft in one area and hard or lumpy in another.

A residential lawn needs a comfortable, stable footing, while a putting green requires an especially smooth, precise foundation for predictable ball roll. Some installations may also use a finer leveling layer over the main aggregate base to create a smoother finish beneath the turf. The turf provides the visible texture, but the base helps determine whether the finished surface feels polished, consistent, and properly built.

How Does the Area Under Artificial Turf Handle Water?

Rainwater needs somewhere to go. If it can’t move away from the surface properly, it can collect in low areas and create drainage problems around your property. That’s why a quality artificial turf installation considers water movement from the beginning rather than treating drainage as an afterthought.

The turf, prepared base, and grading work together to help water pass through the system and move away from areas where you don’t want it to pool.

Where Does Water Go Under Artificial Turf?

Most artificial turf is designed with a permeable backing that allows water to pass through the surface rather than sit on top. From there, the water enters the compacted aggregate base beneath the turf and follows the drainage pattern established during site preparation.

That’s where all that earlier grading work starts to pay off. The goal is to give rainwater a clear path through and away from the installation so your new lawn doesn’t turn into a collection of puddles every time the clouds open up.

Does Artificial Turf Need a Separate Drainage Layer?

Not every artificial turf installation needs an additional drainage layer. On many residential properties, properly graded soil, a permeable aggregate base, and turf with adequate drainage can work together to manage normal rainfall without the need for an additional layer underneath.

Some sites need extra help, though. Poorly draining soil, low-lying areas, hard surfaces, heavy water exposure, or specialized applications may call for drainage mats, channels, pipes, or other drainage solutions. A professional installation should account for existing conditions on your property and design the drainage system to meet the site's needs.

What Sits Directly Beneath and Around Artificial Turf?

By this point, the ground has been prepared, the base is stable, and water has a plan. Now it’s time for the final pieces that help turn all that hidden groundwork into a finished artificial turf surface.

Depending on how the area will be used, installers may add cushioning, secure the turf around its edges and seams, and finish the surface with infill. These details may be less noticeable than the grass itself, but they help the entire system come together.

Does Infill Go Under Artificial Turf?

Despite the name, infill doesn’t normally go underneath artificial turf. It’s applied after the turf has been installed and worked down between the synthetic grass blades.

Infill can help add weight to the turf, support the fibers so they remain upright, and influence how the finished surface feels and performs. The material and amount used depend on the turf system and its intended application. So, while the base does the heavy lifting beneath, infill works from within the turf to put the finishing touches on the surface.

What’s Working Hard Below the Surface

A great artificial lawn may look effortless, but the layers beneath do plenty of work to keep it stable, smooth, and ready for whatever your yard throws at it. If you’re considering artificial turf for your property, Great American Green Inc. can help you build it properly from the ground up. Call (770) 475-5537 to get started.