Artificial turf over a shock pad

The pad is the surfacing, the turf is the finish

A synthetic playground surface is three layers: a compacted aggregate base, a shock pad, and a tufted turf carpet with or without infill. Almost all of the impact attenuation comes from the pad. The turf contributes a small amount, mostly through the infill depth, and the base contributes by being stable enough not to change the answer.

That matters commercially, because turf is frequently sold as if the carpet were the product. The CPSC handbook expects protective surfacing across the whole use zone¹, and in a turf system the things that deliver it are the pad thickness and density, the exact turf it was tested with, and the base it was tested over. Change any one of those on site and the critical fall height rating no longer applies.

Pads come in two broad types. Closed cell cross-linked foam is light, drains through punched holes, and is the common choice under playground turf. Bonded rubber pads, essentially a thin poured or prefabricated rubber layer, are heavier, drain freely and are more forgiving of an imperfect base. Pad thickness runs from about half an inch for low fall heights to 2 inches or more for 8 to 10 foot falls, and thicker systems exist for tall structures.

What the layers are made of

Infill choice is where most of the debate sits. Silica sand is cheap, stable and hot. Coated or rounded sands reduce dust and abrasion. Crumb rubber adds resilience and holds heat badly. TPE and EPDM are cleaner, cooler than crumb rubber and considerably more expensive. Cork and cork blends run cooler and drain well but float, wash out in heavy rain and need topping up more often. Zeolite is sometimes blended in to control odor where dogs are a problem.

Heat is the drawback that decides most projects

This is the honest headline. In direct sun, synthetic turf surface temperatures climb far above air temperature and far above wood fiber, sand or natural grass in the same conditions. Plastic fiber and infill absorb solar energy, and unlike a living lawn there is no evaporation to shed it. On a clear summer afternoon a turf play area can become unusable, and contact burns on bare skin, knees and palms are a real risk rather than a theoretical one.

Nothing removes the effect. Things that reduce it:

• Shade. Trees or a structure over the play area is the only measure that changes the situation rather than softening it. See shade structures and shade and heat design.
• Cooler infill. Coated sands, cork blends or a non-infill product instead of black crumb rubber.
• Lighter fiber colors and less dense thatch, at some cost to appearance.
• Irrigation. A quick sprinkler cycle drops the surface temperature for a short window, which is a scheduling tool rather than a fix.

Drainage decides the lifespan

Turf systems drain vertically: water passes through the perforated backing and the pad and into the aggregate base, which has to carry it away. When the base is undersized, poorly graded or unconnected to an outlet, water sits in the pad. A saturated pad attenuates differently, freezes in winter, and breeds the smell that turf installations become notorious for.

The working spec is an open-graded aggregate base of adequate depth, compacted in lifts, over a geotextile separation layer, drained to daylight or to a collection point, with a fall of roughly 1 percent across the field. Flat sites with clay subgrade need a perforated pipe in the base, not just a slope. This is covered in detail in drainage, base and containment, and it is the single most common reason a turf installation ages badly.

Maintenance: lighter than loose fill, heavier than people expect

Turf is sold as low maintenance. It is low maintenance compared with mowing and compared with raking wood fiber. It is not no maintenance.

The zones that fail first are predictable: under swings, at slide exits and along the main walking line into the structure. Good installations plan for it by using a heavier product or a reinforcement mat in those spots. Surfacing upkeep covers how to fold this into an existing maintenance calendar.

Price, lifespan and replacement

The replacement line is the one that gets missed. When the fiber wears out the pad and base usually have life left, so the second cycle is cheaper than the first, but it is still a five figure item on a typical use zone. Put it beside the other materials in the ten year cost comparison before you decide turf is the economical option.

Accessibility

Turf over a pad performs well as an accessible surface. It is firm, stable and continuous, it does not displace under a wheelchair, and it does not need the constant depth maintenance that keeps engineered wood fiber compliant. On sites where accessible routes through the use zone are a priority⁴, that is a strong argument in its favor, alongside poured rubber and tiles. The detail is in accessible routes and surfacing.

The caveats are at the edges. Perimeter transitions, seams and the joint where turf meets a concrete path all have to stay within the half inch vertical tolerance, and infill migration can leave a low spot at a heavily used entry.

When turf is right, and when it is not

Turf is a good answer for shaded sites, inclusive play areas that need a continuous accessible surface, sites where loose fill would be kicked into a pool or a building entrance, and schools that want a play surface that also works as informal field space. School playgrounds covers that dual use case.

Turf is the wrong answer for hot, unshaded, southern-facing sites, for very high fall heights where the pad thickness needed starts to rival poured rubber in price, for sites with poor drainage and no budget to fix it, and for organizations with no maintenance capacity at all, because ungroomed turf with migrated infill loses both its look and part of its performance.

What to do next

Compare the system quote against a poured rubber quote for the same use zone, since they compete for the same money and serve different priorities. Confirm the pad thickness your fall height needs using the depth and fall height chart, and check the underlying test logic in how surfacing works and surfacing test methods. Then decide the shade question, because on most sites it decides the turf question.