Lightweight Fill | Geofoam

Lightweight Fill for Constructionand Civil Infrastructure

EXPOL GeoFoam (EPS – Expanded Polystyrene) is a lightweight fill solution designed for construction and civil engineering projects where traditional soil, aggregate, or concrete fills are impractical or place excess load on the ground. Weighing as little as 1% of conventional fill, GeoFoam reduces vertical load and lateral pressure, making it ideal for sites with challenging ground conditions, poor bearing capacity, or limited access.

As a multi-functional, inert and dimensionally stable material, EXPOL GeoFoam is used across a wide range of applications, including road embankments, bridge abutments, retaining wall backfill, slope stabilisation, landscaping, causeways, airfields, railway formation, and geotechnical fill, including frost heave protection. Its lightweight nature supports faster installation, reduced construction costs and minimal site disruption — especially valuable in engineered or time-sensitive projects.

Manufactured in a range of densities to suit engineering requirements, EXPOL GeoFoam retains its compressive strength and thermal properties throughout its service life. It absorbs only small volumes of water without significant impact on performance, remains unaffected by weather conditions during installation, and will not rot, settle, or degrade over time. GeoFoam can be cut on site using the EXPOL EX1300 Hot Wire Polystyrene Cutter, enabling clean, accurate shaping for two-dimensional profiles, service channels, and custom solutions.

Containing recycled content and fully recyclable through EXPOL's nationwide recovery programme, GeoFoam supports sustainable construction outcomes while offering a proven, durable, and cost-effective alternative to traditional fill materials for New Zealand builders, civil contractors and engineers.