Wet-pour rubber · Rubber tiles · Artificial grass · Loose fill
Short answer
Wet-pour rubber is the default answer for public playgrounds with accessibility requirements, because it is the only widely used option that provides a continuous, wheelchair-accessible surface at the required critical fall height. Loose fill is the cheapest and is perfectly acceptable where accessibility is not required and someone will actually rake it. Artificial grass is a cosmetic layer over a performance layer, not a safety surface by itself.
What is being compared
Playground surfacing is the impact-attenuating layer beneath and around play equipment, required to absorb a fall from the equipment’s free fall height. Wet-pour rubber and rubber tiles are factory-tested products with a declared critical fall height; loose fill materials such as sand, bark, wood chip and pea gravel achieve attenuation through depth and loosening; artificial grass is a surface finish that must be laid over a separate performance layer.
| Wet-pour rubber | Rubber tiles | Artificial grass | Loose fill | |
|---|---|---|---|---|
| How it achieves attenuation | SBR base layer with EPDM wear layer, poured in place | Moulded rubber tiles with a tested thickness | Only via a separate performance layer underneath | Through depth and looseness of the material |
| Typical critical fall height | Up to about 3 m depending on thickness | Up to about 3 m depending on tile thickness | Determined by the layer beneath it | Depth-dependent, typically up to about 3 m at 300 mm depth |
| Continuity of surface | Seamless across the whole area | Jointed; edges are a trip and lifting point | Seamed, with edges that lift | Continuous but displaceable |
| Wheelchair accessibility | Yes — the usual choice for accessible play areas | Yes, in good condition | Depends on the base construction | No — wheels sink and the surface displaces |
| Typical lifespan | 8–12 years | 10–15 years | 5–8 years for the grass layer | Requires topping up annually; indefinite with maintenance |
| Maintenance profile | Low; inspect for lifting and ponding | Low; watch for lifted or missing tiles | Moderate; brushing, infill top-up, weed control | High; raking, topping up, weed control |
| Performance degradation | Compacts and hardens with UV and use; re-test periodically | Compacts; individual tiles can be replaced | Grass layer wears through; performance depends on the base | Loses attenuation as it compacts — must be kept loose |
| Relative installed cost | High | High | Moderate | Low |
| Best fit | Public parks, schools, accessible play areas | Smaller areas, roof terraces, where access for wet pour is difficult | Decorative areas and low-use settings with a proper base | Low-budget or rural sites without accessibility requirements |
The critical fall height (CFH) of a surfacing product is the greatest drop height at which it still meets the acceptance criteria — HIC 1000 under EN 1177, and HIC 1000 with a g-max of 200 under ASTM F1292. The requirement is that the CFH of the installed surface is at least equal to the free fall height of the equipment above it, across the whole impact area or use zone.
Two mistakes are common. The first is installing a surface whose declared CFH matches the equipment’s fall height exactly, leaving no margin. The second, more serious one, is assuming the declared figure still holds years later. A wet-pour surface that tested at 2.5 m when new may not test at 2.5 m after three summers of UV exposure and compaction — and the equipment has not changed. Specify re-testing in the operations contract, and leave margin at installation.
For any project with public funding, an accessibility standard or a stated inclusion objective, loose fill is usually ruled out immediately. Wheelchair users cannot move across sand, bark or gravel: the wheels sink and the material displaces. A playground that a wheelchair user cannot enter fails the project brief regardless of how well the surfacing absorbs impact.
Wet-pour rubber is the standard answer because it is seamless, firm enough to roll across, and available in the thicknesses needed to meet the fall height requirement. Rubber tiles achieve the same thing but introduce joints, which are where tiles lift at the edges — a trip hazard and the first thing to fail.
This is why surfacing is usually 25–40% of the installed cost of a playground. It is not a decorative finish; it is a structured element with a performance requirement, and it should be specified at the same time as the equipment rather than priced afterwards.
Sand, bark, wood chip and pea gravel can meet the attenuation requirement, at a fraction of the installed cost. The catch is that their performance depends entirely on staying loose and at depth. Compacted bark, or a sand pit that has settled below its specified depth, has lost the property it was installed for. This is the most common non-compliance found in playground inspections, and it is invisible until measured.
If loose fill is the choice, the operations contract must include raking and annual depth checks, not just "maintain the playground". Where that commitment cannot be made, a tested surface with a declared CFH is the more reliable specification even at higher cost, because its performance does not depend on daily human behaviour.
Artificial grass is frequently specified because it looks good and stays green. It is not, by itself, an impact-attenuating surface. The attenuation comes from whatever is beneath it — a shockpad, a bound rubber base, or a sand layer — and the system only performs as tested when the grass, the infill and the base are installed as a single tested assembly.
Substituting a cheaper base under the same grass voids the tested performance, and this happens routinely. If a project specifies artificial grass, specify the complete system with its test certificate, and check that the certificate names the base construction that is actually being installed. The grass layer also has the shortest lifespan of any option here and will need replacing well before the equipment does.
These rules apply to any supplier. If a quotation cannot be matched to one of them, the specification is not yet complete.
| If | Choose | Because |
|---|---|---|
| The playground must be accessible to wheelchair users | Wet-pour rubber | It is the only widely used option that is seamless and firm enough to roll across while providing the required critical fall height. |
| Budget is tight and there is no accessibility requirement | Loose fill with a funded maintenance regime | It is the cheapest compliant option, but only if someone will rake it and check the depth annually. |
| Access for wet-pour plant is difficult, or the area is small | Rubber tiles | Tiles can be carried in and laid by hand where a wet-pour crew and mixer cannot reach. |
| Artificial grass has been specified for appearance | Specify the complete tested system | The grass is a finish; attenuation comes from the layer beneath. Substituting the base voids the tested performance. |
| The equipment has a free fall height close to the surfacing’s CFH | Increase thickness to leave margin, and specify periodic re-testing | Impact attenuation degrades with UV, wear and compaction, so a surface that passes exactly at installation may not pass in year three. |
Comparing surfacing on purchase price per square metre
Run the whole-life sum. Wet-pour at 8–12 years, tiles at 10–15, artificial grass at 5–8 and loose fill at annual top-up cost produce a different ranking from the quotation.
Installing artificial grass over a cheaper base to save money
The attenuation comes from the base. Substituting it voids the tested performance while leaving the appearance of compliance — the worst combination.
Signing off on the installation test and never re-testing
Impact attenuation is not a permanent property. Specify periodic re-testing in the operations contract, and leave margin over the equipment fall height at installation.
Treating loose fill as maintenance-free because it is cheap
Its attenuation depends on staying loose and at depth. Compacted bark or a settled sand pit has lost the performance it was installed for, and this is the most common non-compliance found in inspections.
Critical fall height (CFH) is the greatest drop height at which a surfacing product still meets the acceptance criteria for impact attenuation — HIC 1000 under EN 1177, and HIC 1000 with peak deceleration capped at g-max 200 under ASTM F1292. The surfacing must have a CFH at least equal to the free fall height of the equipment above it, across the whole impact area or use zone.
Yes. Wet-pour rubber and tiles compact and harden with UV exposure and use, and loose fill loses attenuation as it compacts or settles below its specified depth. A surface that passed at installation may not pass a few years later. This is why the operations contract should specify periodic re-testing, and why it is worth installing with margin above the equipment fall height.
Not by itself. Artificial grass is a surface finish; the impact attenuation comes from the layer beneath it, whether that is a shockpad, a bound rubber base or a sand layer. The system only performs as tested when the grass, infill and base are installed together as a single tested assembly. Substituting the base voids the tested performance.
Because wheelchairs cannot move across it. The wheels sink and the material displaces, so a wheelchair user cannot enter or cross the play area. Any project with an accessibility requirement or public funding condition normally rules out sand, bark, wood chip and gravel on this basis alone.
Surfacing commonly represents 25–40% of the installed cost of a playground. It is a structured element with a performance requirement rather than a decorative finish, and it should be specified at the same time as the equipment rather than priced as a line item afterwards.
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Send us the site plan or the specification you are working to. We will tell you which option fits the constraints you actually have, and which one we would not supply for that site.