Writing a Playground Surfacing Specification for Tender

A playground surfacing specification is the contract that defines what you are buying. Written well, it tells every bidder what the surface must achieve and how compliance will be measured, so every tender response is comparable. Written loosely, it invites suppliers to price against different products and standards, and the differences surface later as variations. This guide covers what to include in a playground surfacing specification for tender, from critical fall height to evaluation criteria.

Why a Playground Surfacing Specification Matters

Comparable bids

When every bidder works to the same targets, depths and standards, you can compare prices like for like. A specification that leaves depth or test requirements open produces quotes that look cheaper but deliver less.

Compliance and safety

Safety surfacing exists to absorb impact. A clear specification ties the surface to a measurable standard, most commonly EN 1177, so that what is installed is demonstrably fit for the equipment above it.

Fewer variations

Vague specifications generate variation requests mid-contract, adding cost and delay. A precise specification reduces the scope for a contractor to argue that a substitution was implied.

Performance Requirements vs Prescriptive Requirements

There are two ways to specify a surface, and the best tenders combine them. A performance requirement states the outcome the surface must deliver, such as a specific critical fall height when tested to EN 1177, and leaves the installer to choose the product, depth and build-up that meets it. A prescriptive requirement states exactly what must be used: a defined EPDM wear layer thickness, a named binder, a specified sub-base build-up.

The strongest playground surfacing specification uses performance language for safety-critical outcomes such as impact attenuation and accessibility, and prescriptive language where a detail matters, such as minimum wear layer thickness or a drainage fall.

Key Elements of the Specification

Each element below should appear in the tender, either as a performance target, a prescriptive requirement, or both.

Critical fall height by equipment zone

The critical fall height (CFH) is the greatest fall height a surface can protect a child from, determined by headform drop testing under EN 1177. Each piece of equipment has a free height of fall, and the surfacing beneath it must match or exceed that height, so list every equipment zone rather than applying one blanket depth. For a fuller explanation, read our guide to critical fall height and EN 1177.

Surface type and depth

Name the surface type and, for wet-pour systems, the depth or a depth band tied to the critical fall height required. Wet-pour rubber is typically laid between 15 mm and 130 mm depending on the critical fall height needed. Our comparison of playground surfacing options sets out the trade-offs between wet pour, bonded rubber, synthetic grass and loose-fill systems.

Surface type	Typical build-up	Critical fall height approach	Accessibility
EPDM wet pour	Wear layer over a shock-absorbing base, typically 15 mm to 130 mm total	Tested to EN 1177 to confirm the critical fall height	Firm, stable, wheel-friendly
Bonded rubber mulch	Bound rubber layer, depth set by the required critical fall height	Tested to EN 1177 at installed depth	Firm but textured
Synthetic grass with shock pad	Turf over a shock-absorbing pad	System tested to EN 1177	Firm and even
Engineered wood fibre	Loose fill, topped up over time	Critical fall height depends on maintained depth	Harder to traverse by wheelchair

Engineered wood fibre is covered by ASTM F2075, but as a loose fill it needs regular topping up to hold its critical fall height, a maintenance burden worth weighing against a bonded surface.

EPDM wear layer and binder

Most safety surfacing uses an EPDM rubber wear layer over a shock-absorbing base, bound with a polyurethane or resin binder. Specify the wear layer thickness, the EPDM granule grade and any binder requirements. EPDM granules are supplied in three grades, and the grade affects the finished texture. See the EPDM granules range for the grades available.

Sub-base and drainage

The surfacing only performs as well as what sits beneath it. Define the sub-base type and depth, the required drainage falls, and any edging detail. A surface laid on a poorly drained or unstable sub-base can crack, lift or pond, and these failures are often excluded from the surfacing warranty. Our article on playground sub-base and drainage design explains the detail that belongs in this clause.

Colour and design intent

State the colour palette, any zoning or play markings, and the design intent. Specify whether colours should be integral to the EPDM granule rather than painted on, since painted markings wear away first.

Accessibility requirements

If the play space must be usable by children with disabilities, say so in the specification. An accessible surface should be firm, stable and slip-resistant and should allow a wheelchair to move across it without excessive effort, in line with ADA accessibility intent and, where relevant, ASTM F1951. Bonded surfaces such as wet pour generally outperform loose-fill systems here. See our guide to accessible playground surfacing for detail.

Site constraints and access

Tell bidders about the site: existing levels, tree roots, drainage outfalls, the access route for mixers and materials, and any working-hours or safeguarding restrictions, since these change cost and method.

Compliance Clauses to Include

The compliance section makes the surface’s obligations enforceable. State how each standard will be evidenced, by test report, certificate or on-site testing:

• EN 1176 for playground equipment and the free height of fall that determines the surfacing requirement.
• EN 1177 for impact-attenuating playground surfacing, which determines critical fall height through headform drop testing using HIC and g-max.
• EN 14877 for synthetic sports surfaces where the project includes a MUGA or games area alongside the play space.
• EN 71-3 for the migration of certain elements, relevant to the material safety of the granule for young children.
• REACH regulation (EC 1907/2006) for restrictions on PAH content in rubber granules used in surfacing.
• ASTM F1292 for impact attenuation where a specification is written for a US-oriented project, with a g-max limit of 200 and an HIC limit of 1000.
• ASTM F1951 for the accessibility of surfaces around play equipment, where a US-oriented specification applies.

For sports-focused builds, see our MUGA specification guide to EN 14877.

Evaluation Criteria Beyond Lowest Price

Lowest-price awarding routinely produces the most expensive project once remedial work and maintenance are counted. Weight the tender so technical quality and evidence can win.

Ask bidders for physical samples and current technical datasheets, and check that the datasheet states the critical fall height the installed build-up achieves rather than a generic product claim. Ask for a written installation method, evidence of trained installers, a maintenance and repair schedule, and a warranty statement with its scope, duration and exclusions stated clearly.

Weigh these criteria in the tender notice so bidders can see that compliance, samples, method and maintenance all count. If budget is the deciding concern, our breakdown of playground surfacing cost factors explains where the money actually goes.

Common Specification Mistakes and a Pre-Tender Checklist

Most failed surfacing tenders trace back to a handful of avoidable mistakes:

• Specifying a single depth for the whole site instead of a critical fall height per equipment zone.
• Referencing a standard without stating the performance value required, such as the critical fall height to be achieved.
• Omitting the sub-base and drainage, leaving the most common cause of surfacing failure outside the contract.
• Choosing purely on lowest price and ignoring samples, datasheets and installation method.
• Copying an old specification that names a superseded product or omits accessibility and material-safety clauses.

Before you issue the tender, work through this checklist:

1. List every equipment zone with its free height of fall and required critical fall height.
2. Confirm the surface type, wear layer thickness and EPDM grade.
3. Define the sub-base build-up, drainage falls and edging detail.
4. State the colour palette and design intent, and whether markings are integral.
5. Set out accessibility requirements and the standard they will be judged against.
6. Name the compliance standards and how each will be evidenced.
7. Describe the site constraints and access route for materials and plant.
8. Set the evaluation criteria and their weightings before the tender opens.

Frequently Asked Questions

What is a critical fall height and why is it in the specification?

The critical fall height is the greatest fall height a surface can protect a child from, measured by headform drop testing under EN 1177. The surface beneath each piece of equipment must match or exceed its free height of fall.

Should I specify a product or a performance?

Use performance language for safety-critical outcomes such as critical fall height and accessibility, and prescriptive language where a detail matters, such as minimum wear layer thickness or EPDM grade. This keeps the installer accountable while keeping bids comparable.

Which standards should a playground surfacing tender reference?

Reference EN 1176 for equipment and EN 1177 for impact attenuation as a minimum. Add EN 14877 for any sports area, EN 71-3 and REACH (EC 1907/2006) for material safety, and ASTM F1292 or ASTM F1951 for US-oriented specifications.

How do I keep bidders from gaming the price?

Specify the depth, surface type and standards precisely so every bid prices the same build-up, and weight evaluation so samples, datasheets, installation method and maintenance all count alongside price. Lowest price should never be the sole criterion.

Can I use one specification for a playground and a MUGA?

Not without adjustment. A games area is judged under EN 14877 for sports performance, while a play space is judged under EN 1177 for impact attenuation, so write the two areas as separate clauses or specifications.

Get Your Surfacing Specification Started with Aqua Seal

Aqua Seal supplies and installs international-standard safety surfacing, and works with you through the design process to determine the best surface for your project and budget. Whether you are writing a playground surfacing specification from scratch or tightening an existing one, we can help you set the right critical fall heights, depths and compliance clauses.

Email [email protected] to request our surfacing comparison sheet and budget pricing for your project. Our team can also review your draft specification and advise on the EPDM grades and build-up that will meet your targets.