Impact Absorbing Surfaces (IAS)

A Critical Element of Playground Safety

Falls are an inevitable part of play. Children climb, balance, jump, and test their limits—and that’s exactly what good playgrounds are meant to encourage. What matters most is how the ground beneath them performs when a fall occurs.

This is where Impact Absorbing Surfaces (IAS) play a critical role.

What Is an Impact Absorbing Surface?

An Impact Absorbing Surface (IAS) is any surface designed to reduce the severity of injury when a child falls from playground equipment.

Under current playground safety requirements, any play equipment with a potential fall height greater than 600 mm must be provided with an appropriate IAS.

IAS does not prevent falls.

It does not eliminate risk.

Its purpose is simple and vital:

To absorb impact energy and reduce the likelihood of serious head and life-changing injuries.

Why IAS Performance Matters

When a child falls, the injury risk depends on:

• The height of the fall

• The surface type and condition

• The ability of that surface to absorb energy at the point of impact

A surface that looks soft is not necessarily safe. Likewise, a surface that was compliant when installed may no longer perform adequately years later due to wear, compaction, or degradation.

This is why IAS selection, installation, and maintenance are just as important as the equipment itself.

Key Considerations When Selecting and Installing IAS

Choosing the right impact absorbing surface is not a one-size-fits-all decision. Several factors must be considered together.

1. Overall Play Value of the Site

The surface should support the intended use of the play area, including:

• Movement and accessibility

• Inclusive play

• Running, wheeled play, and fall zones

• Visual integration with the landscape

A highly technical surface that restricts play or creates trip hazards can undermine the value of the space.

2. Type of IAS and Installation Method

Common IAS types include:

• Loose-fill materials (e.g. bark, engineered wood fibre)

• Synthetic turf systems with shockpads

• Wet-pour rubber

• Rubber tiles

Each system has different performance characteristics and installation requirements. Incorrect installation—such as insufficient depth, poor drainage, or inadequate edge restraints—can result in immediate or gradual failure.

3. Suitability for the Equipment Type

IAS must be matched to:

• The maximum fall height of the equipment

• The extent of the fall zone

• Whether the equipment involves dynamic movement (swings, spinners, rotating elements)

A surface that is suitable for a low climbing frame may be completely inadequate beneath a higher structure or moving equipment.

4. Maintenance Requirements

All IAS systems require ongoing maintenance.

Examples include:

• Raking and depth checks for loose-fill materials

• Monitoring seam separation and hardening in synthetic surfaces

• Checking for drainage failure or subsurface breakdown

A surface that is not maintained should be assumed to be non-compliant until proven otherwise.

5. Surface Lifespan and Ageing

No IAS lasts forever.

Over time, impact performance can be reduced by:

• UV exposure

• Compaction

• Material breakdown

• Water ingress

• Sub-base movement

Understanding the expected lifespan of a surface—and planning for inspection, testing, and eventual replacement—is essential for long-term safety and asset management.

Cost Considerations and Compliance Obligations

Meeting Current Safety Standards

Any playground equipment requiring IAS must be:

• Assessed against NZS 5828, including EN 1176 and EN 1177 principles

• Upgraded where existing surfacing no longer meets required performance

Installing new playground equipment without appropriate IAS is not acceptable and exposes owners to unnecessary risk.

Use Only Tested and Certified Materials

IAS materials should:

• Be tested to EN 1177

• Be certified for falls up to (or exceeding) the maximum fall height of the equipment

• Be installed exactly as tested (including shockpad thickness, compaction, and layering)

A product certificate alone is not enough—installation and condition determine real-world performance.

Why IAS Is a Critical Risk-Management Tool

In the event of a serious injury, playground owners are often required to demonstrate that:

• The correct surface type was installed

• It was suitable for the equipment present

• It was maintained and inspected

• Its impact performance was verified

IAS is one of the most scrutinised elements of a playground following an incident—because it is the last line of defence between a child and the ground.

Final Thoughts

Impact Absorbing Surfaces are not an optional extra or a design afterthought. They are a fundamental safety system that must be selected, installed, maintained, and reviewed with the same care as the play equipment itself.

A well-designed playground accepts that children will fall. A well-managed playground ensures that when they do, the surface beneath them works exactly as it should.

Because when it comes to playground safety, what’s under the equipment matters just as much as what’s above it.