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GeoSpan® Compressible Fill
Compressible medium between soil and structures

GeoSpan® Compressible Fill
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GeoSpan compressible fill material is an expanded polystyrene product
designed to act as a compressible medium between swelling soils and
structural elements. Where long-term soil movement can be predicted,
GeoSpan compressible fill material can be designed to reduce the forces
that would be induced on structures by soil movement, thus reducing the
likelihood of damage to the structure above. GeoSpan compressible fill
material is unaffected by water, does not support vermin or insects, and
the dimensions can be easily adjusted on the job site. GeoSpan
compressible fill material properties assist designers in addressing the
following code requirements:
  • GeoSpan compressible fill material is designed specifically to meet
    the structure requirements for each application.
  • GeoSpan is available in a range of compressive resistance to permit
    design for light structural to heavy structural elements.
  • GeoSpan design criteria are provided for each application in the
    design summary for review by the engineer.
  • GeoSpan is not affected by the presence of water on the short
    term nor is it dependent on the presence of water in the long term.

Applications using GeoSpan

Applications using GeoSpan

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Product Information Bulletin
GeoSpan and GeoVoid Compressible
Fill Material Design Provisions for
Soil Movement

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GeoSpan Chart

Required Project Data for GeoSpan Design
Structure Depth Structure Weight Soil Swell Structure Uplift Capacity
  A = slab thickness - mm (inches)
B = self-weight of the structure - kPa (psf)
C = long term upward movement of soil beneath structure - mm (inches)
D = structure uplift capacity = maximum GeoSpan compressive stress

GeoSpan thickness (t) is determined using the equation:

t =
Soil Swell (mm) x 100
Final GeoSpan % Strain