GeoFoam | Lightweight fill

    Ultra-lightweight fill and insulation solution offering high strength
    and versatile applications for geotechnical and construction projects.

    Download DatasheetTechnical Manual

    Lightweight Geotechnical Fill Solution

    Building Product Information Sheet

    GeoFoam is a lightweight engineered EPS fill used to reduce structural load and enhance performance in civil construction and infrastructure applications. It delivers high strength-to-weight ratio, making it ideal for projects requiring stability without excessive ground pressure.

    This solution supports efficient construction, faster installation and improved performance in challenging geotechnical conditions.

    Engineering Advantages

    Reduces soil pressure, improves ground stability and supports slope and embankment performance.

    Civil and Infrastructure Applications

    • Road embankments
    • Bridge approaches
    • Retaining wall systems
    • Land stabilisation projects
    Ultra
    Lightweight
    High
    Strength
    EXPOL GeoFoam Product

    Key Features & Benefits

    Ultra-lightweight construction
    High strength performance
    Versatile application range
    100% Recyclable
    Durable
    Eliminates lateral pressure and vertical movements

    Why Choose GeoFoam?

    Geotechnical Excellence

    Perfect for embankment fills, bridge approaches, slope stabilization, and retaining wall backfill applications.

    Construction Benefits

    Reduces dead loads, lower lateral pressures, minimal settlement, and enables fast installation processes.

    Specialised Projects

    Ideal for infrastructure projects, challenging terrain solutions, and complex engineering applications.

    Applications

    Construction
    Road Embankments
    Bridge Abutments
    Causeways
    Retaining Wall Fill
    Replacement of Poor Soils
    Landscaping
    Geotechnical Fill
    Frost Heave Protection
    Sites with Limited Access

    Learn more about specific applications

    Click a solution below to view installation guides and full system details

    Lightweight Fill | GeofoamLightweight Fill | Geofoam

    Product Specifications

    ProductLength (mm)Width (mm)Thickness (mm)
    EXPOL GeoFoam (S/M/H/VH)24501220630
    EXPOL GeoFoam (S/M/H/VH)49001200630

    S = Standard, M = Medium, H = High, VH = Very High density grades available

    Technical Data

    Properties / Test Method / StandardGEOFOAM S GRADEGEOFOAM M GRADEGEOFOAM H GRADEGEOFOAM VH GRADEGEOFOAM RECYCLED GRADE
    MaterialExpanded Polystyrene
    Density16 kg/m³20 kg/m³24 kg/m³28 kg/m³14 kg/m³
    Block Size2450 mm × 1220 mm × 630 mm | 4900 mm × 1220 mm × 630 mm
    Rate of water vapour transmission (max) - Measured parallel to rise at 23°C (AS 2498.5)520 mg/m²s520 mg/m²s460 mg/m²s400 mg/m²s750 mg/m²s
    Compressive Resistance (AS 2498.3)at 1%: 34 KPAat 1%: 49 KPAat 1%: 64 KPAat 1%: 88 KPAat 1%: 17 KPA
    at 2%: 59 KPAat 2%: 96 KPAat 2%: 108 KPAat 2%: 142 KPAat 2%: 34 KPA
    at 5%: 74 KPAat 5%: 111 KPAat 5%: 133 KPAat 5%: 172 KPAat 5%: 48 KPA
    at 10%: 84 KPAat 10%: 126 KPAat 10%: 146 KPAat 10%: 189 KPAat 10%: 57 KPA
    Young's Modulus3.8 MPA4.1 MPA6.2 MPA8 MPA2.2 MPA
    Cross breaking strength (AS 2498.4)165 KPA200 KPA260 KPA320 KPA90 KPA
    Dimensional stability (max) - Length, width & thickness at 70°C for 7 days (AS 2498.6)1%
    Flame propagation surface ignition (AS 2122.1-1993)Medium flame duration (max): 2 sec
    Eighth value: 3 sec
    Fire behavior (AS/NZS 1530.3:1999)Spread of flame index (0-10): 0
    Smoke developed index (0-10): 5
    Recycled Content5%0%0%0%100%
    RecyclabilityEPS is 100% recyclable
    Environmental StatementEPS is inert and non-toxic. There are no chemicals or gases harmful to the environment emitted from EPS either during manufacture or within use.
    Ozone Depleting PotentialEPS does not contain ozone-depleting CFC or HCFC gases, nor use them in its manufacture. As a result, EPS has zero ozone depletion potential.
    Vermin ResistanceEPS does not offer any nutritive value

    GeoFoam Warranty & Compliance

    Warranty and New Zealand Building Code compliance information from the EXPOL GeoFoam Technical Data Sheet and Building Product Information Sheet.

    EXPOL GeoFoam warranty and building code compliance
    SpecificationDetail
    Warranty20-year EXPOL EPS Foam Insulation warranty
    DurabilityAt least 50 years where transported, stored and installed correctly (Clause B2)
    NZ Building CodeContributes to B2 Durability (B2.3.1 a, b), E3 Internal moisture (E3.3.1), F2 Hazardous building materials (F2.3.1 a) and H1 Energy efficiency (H1.3.1 a, H1.3.2 e)
    Building Act statusNot subject to a warning or ban under the Building Act 2004
    Place of manufactureNew Zealand

    Source: EXPOL GeoFoam Technical Data Sheet and Building Product Information Sheet, linked above. For project-specific advice contact the EXPOL Tech Team.