Tag Archives: EPS

Out of Sight, Not Out of Mind: Specifying thermal insulation below-grade and under-slab

All photos courtesy Insulfoam

Balancing performance and cost for insulation installed on below-grade foundation walls and under floor slabs can require specifiers to rethink common assumptions about rigid foam insulation. Misperceptions about the moisture absorption of expanded polystyrene (EPS) compared to extruded polystyrene (XPS) may be limiting more cost-effective choices. Test results demonstrate the long-term durability and moisture resistance of EPS insulation and the stability of its thermal performance. In many applications, substituting a strong and adequate, yet lower compressive resistance insulation, can result in significant cost savings.

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White, Light, and Out of Sight: Geofoam applications for infrastructure and building projects

Photo courtesy Insulfoam

Design professionals are increasingly choosing geosynthetics like expanded polystyrene (EPS) geofoam as a lightweight fill material in infrastructure and building applications. The material is about 100 times lighter than traditional fills, yet is strong enough to support pavements carrying jumbo jets. EPS geofoam is durable, moisture-resistant, and, unlike other fills, has predictable stress/strain curves. The Federal Highway Administration (FHWA), state and local jurisdictions and private engineering firms have specified EPS geofoam for soft soil remediation, lateral load reduction upon retaining structures, slope stabilization, buried utility protection and structural void fill.

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