Beaver Plastics Ltd.

Terrafoam HS (High Strength) Rigid Insulation – is our white EPS rigid insulation board available in high strength (HS) varieties including 25, 30, 40, 60, 80 and 100 psi compressive strength. Terrafoam Rigid Insulation products are produced from inert closed cell expanded polystyrene (E.P.S.) and have excellent resistance to freeze/thaw, zero capillarity, low moisture absorption characteristics, zero off-gassing and zero loss in R-value over time.Terrafoam HS is available in a variety of sizes and thicknesses to meet your project requirements.
Terrafoam HS Rigid Insulation

TERRAFOAM® HS is a closed cell high compressive resistant polystyrene insulation product used for geotechnical service. It should be used wherever large slab loads or lateral earth forces would compress typical insulation products.

TERRAFOAM HS provides stable thermal performance for the life of the structure, without using blowing agents that contribute to global warming. It is totally CFC and HCFC free. TERRAFOAM® HS can be used in low temperature applications such as freezers and coolers, under streets and highways, airport taxiways, bridge abutments and approach slabs, plaza decks, underground parking structures, and skating arenas and curling ice. Contact Beaver Plastics for specific design considerations.

The Terrafoam High Strength HS-25, HS-30, HS-40, HS-60, HS-80 and HS-100 designations indicate maximum compressive strength in PSI. However, these values are the result of a standard test used for quality control and for monitoring manufacturing processes used throughout the polystyrene insulation industry. All expanded and extruded polystyrene products are subject to high rates of creep under sustained loading, and therefore conservative compressive resistance values should be used wherever long-term creep cannot be tolerated. For static loading, a safety factor of 1:3 is reasonable. A dynamic load calculation may use a safety reduction factor of 1:5. Consult Beaver Plastics when using our High Strength products for large volume earth displacement projects.

Terrafoam HS (High Strength) products  may provide “best service” for demanding geotechnical service as well as any other application where large panel sizes, thickness or very high compressive strength would be beneficial.

TERRAFOAM is also more effective at lower temperatures, R-Value increases as temperatures decrease.


Terrafoam EPS meets or exceeds CAN/ULC S 701 and ‘ASTM C578’.

  • Perimeter insulation for grade beams and foundation walls
  • Under concrete slabs on grade
  • Roadways
  • Sports Fields
  • Landscaping
  • Buried Utilities
  • Above-grade insulating sheathing under stucco and siding
  • Masonry Cavity Walls
  • Roof Insulation
  • Flat and sloped applications
  • Coolers, Freezers and Ice Arenas
  • Floatation applications
  • Hot Tub Covers
  • Packaging, protection, container linings
  • Custom fabrications and applications