Geotechnical engineers recognize the validity of using expanded polystyrene (EPS) geofoam as lightweight fill to reduce mass and associated gravitational driving forces within sloped embankments. The detail below illustrates a typical slope stabilization application using GeoSpec® lightweight fill material. GeoSpec EPS geofoam with a density from 20 to 40 kg/m3 is up to 100 times lighter than in-place soil with a typical density of 2,100 kg/m3. This means that replacing in-place soil in an unstable slope with EPS geofoam can achieve a significant net reduction in driving force within the embankment.