EPS Geofoam has been used in roadway embankment construction for over 50 years, with the first major application in Norway in 1972.
Why Use EPS Geofoam in Embankments?
EPS Geofoam weighs approximately 1 to 2.5 pounds per cubic foot, compared to 100 to 130 pcf for compacted soil fill — a 98 to 99% weight reduction.
Load Calculation Approach
The design process begins with a settlement analysis of the existing subgrade to determine how much settlement would occur with a conventional soil embankment.
Pavement Interface Design
A reinforced concrete load distribution slab — typically 4 to 8 inches thick — is placed on the geofoam to distribute wheel loads and protect the foam.
Lateral Load Reduction
EPS Geofoam significantly reduces lateral earth pressure on retaining walls, bridge abutments, and other structures.
Construction Considerations
Blocks are placed in staggered courses with joints offset to prevent continuous vertical planes of weakness. Protect foam from hydrocarbons and UV exposure.
Key Takeaways
- EPS Geofoam is 98–99% lighter than soil, dramatically reducing stress on soft subgrades
- A reinforced concrete load distribution slab is typically required between geofoam and pavement
- Geofoam also reduces lateral earth pressure on retaining structures and abutments
- Protect geofoam from hydrocarbons, flames, and UV — install protective cover promptly
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