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Geofoam is expanded polystyrene (EPS) manufactured into large lightweight blocks. The blocks vary in size according to customer requirement. The primary function of geofoam is to provide a lightweight void fill below a highway, bridge approach or parking lot. EPS Geofoam minimizes settlement on underground utilities. Geofoam is also used in much broader applications, including lightweight fill, green roof fill, compressible inclusions, thermal insulation, and (when appropriately formed) drainage.
Geofoam consists of numerous open-ended tubes that are glued, bonded, fused or otherwise bundled together.” The cross-sectional geometry of an individual tube typically has a simple geometric shape (circle, ellipse, hexagon, octagon, etc.). The overall cross-section of the assemblage of bundled tubes resembles a honeycomb.
Traditional earth materials are heavy, cause settlement, instability and/or lateral pressures. Alternative lightweight fill materials such as foamed concrete, waste tires, soil, woodchips and wood fiber have higher densities, are variable in their makeup and are not engineered, due to field execution variables.