Expanded polystyrene (EPS) geofoam as a soil substitute – When we think of the word “substitute”, we think of a replacement something that is different from the original but has some quality that makes it equal or better by offering additional options. In civil engineering, job coordinators need to take multiple considerations into account when deciding on an appropriate soil substitute. material and labor costs, material performance, availability, durability, sustainability, etc. One soil substitute that checks off all these boxes is EPS geofoam. EPS geofoam is a geotechnical product that has a wide range of structural uses – slope stabilization and embankment fill being two of the most practical. It is both lightweight and durable, allowing for ease of use and extensive life. The EPS Industry reported that “Because it is approximately 98% to 99% air by volume, geofoam is a very efficient thermal insulator.” Its lightweight reduces structural load while its compressive strength allows it to withstand heavy loads. EPS geofoam has been used beneath roadways and bridges as well as airport runways. Engineers marvel at the thought of using a material with such reliable and versatile properties as EPS geofoam.