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EPDM (ethylene propylene diene monomer) is a synthetic rubber that resists UV light, ozone and temperature changes. Granulated EPDM is mixed with a polyurethane binder and spread on the ground; once cured it forms a flexible, porous and slip-resistant surface. The granules broadcast on the top of athletics tracks are the same EPDM.
Playgrounds usually use a two-layer system:
Sports and walking areas need less impact absorption, so the total thickness is thinner.
EPDM can be laid on concrete, asphalt or well-compacted granular sub-base. The sub-base must be load-bearing, even and sloped. Because the surface is permeable, the sub-base must drain water away or have sufficient surface fall.
A polyurethane primer is applied to concrete or asphalt for adhesion.
SBR granules and binder are mixed to a uniform blend, screeded to thickness and compacted with a trowel.
Coloured EPDM is mixed with binder at roughly 18–22% by weight and laid over the SBR. Patterns and logos are formed at this stage with different colours. In bright colours with strong UV exposure, an aliphatic binder reduces yellowing.
Depending on temperature and humidity the surface is usually walkable in 24–48 hours. A few more days are recommended before full use.
Impact performance of playground surfaces is assessed with critical fall height tests under EN 1177. Thickness must be chosen according to the free fall height of the play equipment and verified by test reports. Reducing thickness arbitrarily directly affects safety.
Regular sweeping, removing leaves and sand, and occasional low-pressure washing are sufficient. Keeping the pores open preserves permeability. Cigarettes, sharp objects and heavy vehicles can damage the surface.
SFS Engineering installs EPDM surfaces as part of outdoor sports area and school projects. For the role of EPDM on athletics tracks, see our tartan track guide.
No. A tartan track is a polyurethane athletics surface, and EPDM granules are usually broadcast on its top layer. EPDM flooring is a system where the granules are mixed with binder and poured as the surface itself.
Thinner in sports and walking areas, thicker in playgrounds depending on the fall height of the equipment. Thickness should be based on EN 1177 test results.
Yes, its porous structure lets water through, so the sub-base must drain or have enough fall.
Many years with correct installation and regular maintenance. Life depends on use, UV exposure and binder quality.
Get technical support for your project: SFS Engineering handles site survey, design, material selection and installation as a single contractor. Send us your dimensions and site details through our contact page and we will work out the right solution together.