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EXPOL GeoFoam (EPS – Expanded Polystyrene) block is used as lightweight fill in problematic situations.

It is multi-functional and is suitable for a wide range of applications, including construction on soft ground, slope stablisation and civil infrastructure work such as bridge abutments, airfield pavements and railway track systems.

EXPOL GeoFoam (EPS – Expanded Polystyrene) is preferred by specifiers and engineers because it reduces construction costs and timeframes, is easy to handle, can be cut on site, and is unaffected by weather conditions.

It offers exceptionally high compressive strength despite weighing only 1% of traditional soil fill and 10% of conventional lightweight fills.

It is made from (EPS – Expanded Polystyrene) beads that have been moulded into blocks, Lightweight fill can be cut into any size or shape depending on the requirement of the project.

As an ultra-lightweight fill the stress on underlying subgrades and adjacent structures is significantly reduced.  It helps improve stability against bearing and slope failures.

EXPOL GeoFoam Block

EXPOL GeoFoam as part of a buildings construction

EXPOL GeoFoam used to stabilise the ground

EXPOL GeoFoam Foundation

EXPOL GeoFoam (EPS – Expanded Polystyrene) clean waste can be recovered for recycling.

It is ideally suited for use in construction over soft substrates, road embankments, bridge abutments, causeways, retaining wall fill and for replacement of poor soils, landscaping, geotechnical fill, frost heave protection and on sites with limited access.

GeoFoam is manufactured from standard Expanded Polystyrene foam and is available in a variety of grades to suit different construction conditions (see Table 10.2). Typical densities range from 12kg/m3 to 32kg/m3. GeoFoam will absorb small volumes of water, however this will not have a significant effect on its mechanical properties or performance.


EXPOL can provide a producer statement for all EXPOL GeoFoam material on request.


All products and grades of Expanded Polystyrene supplied by EXPOL for lightweight fill comply with manufacturing standard AS 1366 Part 3 1992.

It is used as an insulation solution for:

   Lightweight Fill EXPOL GeoFoam

EXPOL Geofoam




Expol GeoFoam Advantages

  • Lightweight
  • High compressive strength
  • Cost effective
  • Durable
  • Weighs 1% of conventional fill
  • Eliminates lateral pressure and vertical movement
  • All clean waste can be recovered for recycling


  • Construction
  • Road embankments
  • Bridge abutments
  • Causeways
  • Retaining wall fill
  • Replacement of poor soils
  • Landscaping
  • Geotechnical fill
  • Frost heave protection
  • Sites with limited access

Chemical Resistance

Expanded Polystyrene block is resistant to soaps and inorganic substances such as dilute acids, alkalis and salt solutions. It is attacked by organic solvent, including hydrocarbon fuels and lubricants.

Product Properties
To enlarge table information click table. 

EXPOL Geofoam


Is EXPOL GeoFoam water resistant?

EXPOL GeoFoam will absorb small volumes of water, which will not have an effect on its mechanical properties or performance.

Made of 98% trapped air, Expanded Polystyrene (EPS) demonstrates excellent thermal insulation properties.

What size does EXPOL GeoFoam come in?

Auckland and Chch 4900 x 1220 x 620 Wellington Blenheim Cromwell 2450 x 1220 x 620

Can I get other sizes?

Yes we can cut them down to suit you project.

How durable is EXPOL GeoFoam?

EXPOL GeoFoam is made from expanded polystyrene (EPS), a product that has a long established reputation for resisting degradation over the lifespan of a building.  It is also resistant to soaps and inorganic substances such as dilute acids, alkalis and salt solutions.  EXPOL GeoFoam is not resistant to organic solvents including hydrocarbon fuels and lubricants.

Where is EXPOL H Grade GeoFoam 24kg/m3 used?

It is used under commercial foundations.

Where is EXPOL VH Grade GeoFoam 28kg/m3 USED?

It is used under commercial foundations, driveways and roads.

Where is EXPOL S Grade GeoFoam 16kg/m3 used?

It is commonly used in place of back fill where there is minimal loading such as gardens or lawns

Where is EXPOL M Grade GeoFoam 20kg/m3 used?

It is used under residential foundations.


EXPOL GeoFoam is suitable for use in protection against frost heave, beneath refrigerated storage buildings and under storage tanks to prevent ground freezing.



EXPOL Technical Product Guide


EXPOL GeoFoam Technical Manual


EXPOL products are available at a number of leading building products stores. Find your nearest stockist here.

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