The base is one of the most important factors determining the long-term performance of non-infill artificial turf. A properly designed foundation helps control surface flatness, drainage, dimensional stability, seam performance, and the risk of wrinkles or localized settlement.

Because non-infill turf does not rely on loose sand or rubber infill to help stabilize the surface, the quality of the base and installation system becomes particularly important.

For many outdoor projects, the base can be constructed using either a concrete base or an asphalt base, supported by properly compacted subgrade and aggregate layers. However, there is no single base specification suitable for every project. Soil conditions, climate, drainage requirements, sports application, local codes, and the selected turf system all need to be considered.

1. Why Is the Base So Important for Non-Infill Artificial Turf?

Artificial turf follows the geometry of the surface underneath it.

If the foundation is poorly prepared, problems can eventually appear on the finished turf surface.

Uneven base → uneven turf

Local depressions or high spots can become visible through the turf, producing:

• Waves
• Low spots
• Uneven playing surfaces
• Localized water accumulation

Settlement → wrinkles and seam problems

If the subgrade or aggregate layer is inadequately compacted, differential settlement can occur.

This can contribute to:

• Turf movement
• Wrinkles
• Edge lifting
• Seam stress
• Localized depressions

Poor drainage → standing water

A turf system can drain well only when the underlying base and drainage system are properly designed.

Insufficient slope, blocked drainage paths, or an unsuitable sub-base can result in prolonged standing water.

Freeze-thaw conditions → additional stress

In cold climates, water trapped in the foundation can freeze and expand.

Repeated freeze-thaw cycles can contribute to:

• Heaving
• Cracking
• Settlement
• Surface deformation

Therefore, good artificial turf starts with good civil engineering.

2. What Does a Typical Artificial Turf Base Look Like?

A common outdoor structure can be organized from the bottom upward as:

Compacted subgrade
↓
Aggregate sub-base
↓
Asphalt or concrete base
↓
Shock pad, where required
↓
Non-infill artificial turf

Not every project requires exactly these layers.

For example, some landscaping installations may use a different foundation system, while professional sports facilities may require a more engineered sub-base, drainage network, shock pad, and specialized surfacing system.

The final structure should be determined by the site investigation and project design, not simply by copying a standard layer thickness.

3. Step 1: Prepare and Compact the Subgrade

The first layer is the natural soil or engineered fill.

Before installing the aggregate layer, contractors should address:

• Unsuitable soil
• Organic material
• Soft spots
• Excessive moisture
• Poor drainage
• Differential settlement risks

The subgrade is then compacted using appropriate equipment.

A commonly encountered project specification may require a compaction level around 93% or higher, but this should not be treated as a universal requirement. The appropriate target depends on the soil classification, project design, applicable geotechnical specification, and compaction test method.

For professional sports facilities, a geotechnical assessment is preferable to relying on a generic percentage.

4. Step 2: Install the Aggregate Sub-Base

A graded aggregate layer is commonly used above the compacted subgrade.

Its functions include:

• Distributing loads
• Improving structural stability
• Supporting drainage
• Reducing differential settlement
• Providing a stable platform for the upper base

Typical aggregate thicknesses may fall within approximately 150–200 mm, but actual thickness should be calculated according to:

• Soil bearing capacity
• Climate
• Frost conditions
• Drainage
• Expected loading
• Sports application
• Local engineering requirements

The aggregate should be placed in controlled lifts and compacted appropriately rather than simply dumped and rolled once.

5. Concrete vs. Asphalt Base

Two common hard-base solutions are concrete and asphalt.

Neither system is universally “better.”

For a particular project, the appropriate solution depends on the site, climate, drainage, structural design, turf system, and construction budget.

6. Concrete Base: What Should Be Checked?

For concrete foundations, commonly specified considerations include:

Concrete strength

A project may specify a strength class such as C25 or higher, but the correct concrete grade should come from the structural and civil design.

Surface flatness

The surface should be checked systematically before turf installation.

A specification such as ≤3 mm deviation over a specified straightedge length may be used on some projects, but the exact straightedge length and tolerance should come from the project specification.

Curing

Fresh concrete requires adequate curing before the artificial turf system is installed.

28 days is a commonly referenced concrete curing period for conventional concrete, but it should not be treated as a universal rule that automatically determines when a turf can be installed.

More important is whether the concrete has achieved the required strength and whether its moisture condition is suitable for the adhesive and turf system.

Surface condition

Before installation, the concrete should be free from:

• Cracks requiring repair
• Loose material
• Dust
• Oil
• Standing water
• Excessive laitance
• Contamination

7. Asphalt Base: What Should Be Checked?

For asphalt foundations, contractors should pay particular attention to:

• Aggregate gradation
• Asphalt mix
• Layer thickness
• Compaction
• Surface flatness
• Drainage slope
• Temperature during installation
• Long-term deformation

A high-quality asphalt surface can provide a suitable foundation for artificial turf, but the asphalt must be properly compacted and sufficiently stable before turf installation.

Again, a generic “95% compaction” figure should not replace the project's engineering specification and testing requirements.

8. Flatness Is One of the Most Important Acceptance Criteria

For non-infill turf, flatness deserves particular attention.

A commonly referenced project tolerance may be around:

3 mm over a specified straightedge length

but the exact requirement varies by sport, country, and project specification.

For professional football facilities, the applicable FIFA requirements and project documentation should take precedence over a generic internet specification.

The important principle is:

Measure the base before installing the turf—not after problems become visible.

Areas that exceed the permitted tolerance should be corrected through appropriate grinding, leveling, patching, or reconstruction before turf installation.

9. Drainage and Slope

A good drainage system is more than simply giving the surface a slope.

The complete system may include:

surface slope + permeable layers + drainage channels + perimeter drainage + subsoil drainage

Depending on the design, surface gradients around 0.2%–0.5% may be encountered in sports-field projects, but the actual slope must be determined by the engineering design and the requirements of the selected turf system.

The critical requirement is that the slope should be:

• Consistent
• Free from sudden changes
• Connected to an effective drainage system
• Designed to prevent localized ponding

A drainage slope that looks correct on paper can still fail if the underlying drainage system has insufficient capacity.

10. Don't Install Turf on a Wet or Unstable Base

This is particularly important for adhesive-backed installations.

Before installation, the contractor should verify the base condition specified by the turf and adhesive manufacturer.

Depending on the system, relevant checks may include:

• Surface moisture
• Relative humidity
• Concrete moisture condition
• Surface temperature
• Ambient temperature
• Cleanliness
• Surface strength

There is no universal moisture percentage that applies to every turf adhesive.

For example, a manufacturer's adhesive may have a specific maximum substrate moisture requirement, while another system may use a different measurement method.

Therefore:

Always follow the adhesive manufacturer's technical data sheet rather than applying a generic “≤8% moisture” rule to every project.

11. What About Expansion Joints and Cracks?

Concrete bases naturally require careful joint design.

Existing joints should not simply be ignored when artificial turf is installed.

The project team should determine:

• Where control joints are located
• Where expansion joints are required
• Whether joints need to be transferred through the turf system
• How cracks will be treated
• Whether movement isolation is required

Covering a structural problem with artificial turf does not eliminate the underlying movement.

If the base continues to move, the turf system may eventually reflect that movement.

12. Base Acceptance Checklist

Before installing non-infill artificial turf, I recommend checking at least the following:

Only after the base passes inspection should the turf installation proceed.

13. Does Non-Infill Turf Need a More Precise Base?

In many applications, yes.

But the reason should be explained carefully.

It is not simply because “non-infill turf has no infill.”

Rather, non-infill systems rely more directly on the engineered turf structure and installation system to provide the required surface characteristics. Therefore, deficiencies in the underlying foundation can have a greater effect on the finished surface.

For professional sports fields, the base should be designed as part of the complete sports-surface system, including drainage, shock absorption where applicable, turf construction, seams, and maintenance.

14. What About FIFA and International Projects?

For professional football projects, it is better to use the current FIFA requirements and the project's approved construction specification rather than relying on generic “FIFA base standards” found online.

FIFA's football turf guidance places significant emphasis on the quality of the basework, drainage, installation and overall field construction. The turf surface is only one component of the complete football field system.

This is especially important for non-infill football turf because the performance of the final surface depends on the interaction between:

sub-base + drainage + base + turf system + installation + maintenance

15. What About VivaTurf?

VivaTurf has experience supplying artificial turf systems for sports projects and international markets, including non-infill applications.

When considering a VivaTurf non-infill system, the most useful approach is not simply to ask for a generic “foundation standard.” Instead, ask the supplier for the installation specification for the exact turf model and application.

This should clarify:

• Recommended base construction
• Flatness requirements
• Drainage requirements
• Suitable substrate
• Moisture requirements
• Adhesive requirements
• Seam installation
• Shock-pad requirements, if applicable
• Temperature limitations during installation
• Acceptance procedures

For a professional project, these requirements should then be coordinated with the civil engineer and installation contractor.

VivaTurf's experience with international sports projects can be a useful reference, but the final foundation design should always be project-specific.

Final Answer: How Should You Build the Base for Non-Infill Artificial Turf?

The basic principle is:

Build the foundation first, then install the turf.

A typical outdoor structure can be:

Compacted subgrade → graded aggregate sub-base → concrete or asphalt base → optional shock pad → non-infill artificial turf

The most important factors are:

1. Stable and properly compacted subgrade
2. Adequate aggregate sub-base
3. High-quality concrete or asphalt surface
4. Consistent surface flatness
5. Correct drainage slope and drainage capacity
6. Adequate curing and moisture condition
7. Proper treatment of cracks and joints
8. Compliance with the turf and adhesive manufacturer's installation requirements

And perhaps the most important takeaway is:

There is no universal “3 mm / 2‰ / 28 days / C25” recipe that should automatically be applied to every non-infill turf project. Those figures can be useful reference points, but the final requirements should come from the project's civil design, applicable standards, local climate and soil conditions, and the selected turf system.

For a high-quality non-infill installation, the turf and the foundation should be designed as one system—not as two separate products.

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