advanced eps technology
Terrafoam EPE
Non-Collapsing, Fully Elastic Fill Suitable for Hydrocarbon Exposures

Frost Cushion

Product Description

TERRAFOAM EPE is inert closed cell polyethylene foam typically used as a void form, with excellent resistance to freeze/thaw, zero capillarity and low moisture absorption. It is manufactured in four densities. TERRAFOAM EPE has the unique capacity to recover after compression/decompression cycling, particularly useful as a void form under foundation structures to prevent water and silt accumulation and the subsequent expansive forces from freezing. It is suitable for typical hydrocarbon exposures. (See brochure). TERRAFOAM EPE will never rot; support mold or mildew. It is NOT biodegradable.


  • As a protective void form under structural concrete slabs, pile caps, grade beams and bridge abutments
  • Floatation applications
  • Packaging, shock and damage protection, container linings
  • Client's proprietary fabrications

Engineered Test Methods for Accurate Product Selection

Test methods traditionally used for evaluating foamed expanded polyethylene & extruded polystyrene were developed to measure impact protection in packaging applications. These test methods do not provide relevant information for most geotechnical applications. Beaver Plastics has developed test methods that measure response to slow-moving, long-term, progressive and cyclic earth forces. These accurately mimic actual conditions for time and pressure, producing the most functional and economical choices for using foamed polyethylene as a void form.

Understanding the Performance of Polyethylene Foam

Polyethylene foam is unique when compared to other void form materials, as most of the resistance to compression is due to entrapped air within its cellular structure. The required thickness calculation involves two separate phases of activity.

Concrete Placement Compression

Immediately on placing fresh concrete, EPE compression is directly related to load. A small amount of air begins to escape and the foam slowly deforms. This first phase of performance ends with concrete final set and progressive hardening within approximately 8 hours, as it is then self-supporting on the piles. See EPE Charts and Data which show the amount of compression that will take place under fresh concrete at various loads.

Subgrade Expansion Compression

The second phase of performance is the gradual long term compression that occurs when a freezing damp subgrade or clay soil expands upward, creating stress transmitted through the EPE to the structure above it. The remaining thickness of EPE (after loss due to concrete placement) should be approximately 3 times the anticipated soil swell thickness, so as to avoid long term creep and set effects.

EPE Protection

Terrafoam EPE Protecting High Pressure Vessel's Foundation from Frost or Clay Swell

Beaver’s Research Capability

There may be unique requirements for void form that would be subject to different geotechnical conditions than typically expected. Beaver Plastic’ laboratory is able to test many polymeric foam materials that might possibly meet novel operating conditions. Consult Beaver’s Technology Department for more information.

Toll free in the U.S. and Canada:

Phoning from other countries:
1 780 962 4433

Fax: 1 780 962 4640


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Beaver Plastics Ltd Head Office:
11581-272 Street
Acheson, Alberta
Canada T7X 6E9

Branch Plant Location:
Chilliwack, British Columbia, Canada

Beaver Plastics de Mexico
Uruapan, Michoacan, Mexico