STYROFOAMâ„¢ Brand HIGHLOAD 40 Insulation

A Type VI extruded polystyrene foam insulation with a minimum compressive strength of 40 psi (275 kPa).

Used In

  • For high-load commercial applications
  • For geotechnical and other in-ground insulation applications

Product Advantages

  • Resists compressive creep and fatigue
  • Delivers long-term compressive strength and thermal performance in high-load applications
  • Square edge (U.S.) and butt edge (Canada)

Typical Physical Properties

These properties are typical but do not constitute specifications.

STYROFOAM™ HIGHLOAD 40 - U.S. Commercial

Nominal Board Thickness(1), in R-Value(2) Board Size, ft Edge Treatment Min Compressive Strength(3), psi
2.0 10.0 2 x 8 / 4 x 8 Square Edge 40
3.0 15.0 2 x 8 / 4 x 8 Square Edge 40

(1) Not all product sizes are available in all regions.

(2) R means resistance to heat flow. The higher the R-value, the greater the insulating power. R-values are expressed in ft2• h•°F/Btu. R-value determined by ASTM C518.

(3) Vertical compressive strength is measured at 10% deformation (5% for STYROFOAM™ Brand PLAZAMATE™ Insulation and for STYROFOAM™ Brand HIGHLOAD 40, 60 and 100 Insulation products) or at yield, whichever occurs first. Since STYROFOAM™ Brand Extruded Polystyrene and Dow polyisocyanurate insulation products are visco-elastic materials, adequate design safety factors should be used to prevent long-term creep. Adequate design safety factors are needed. For more information visit our Answer Center.

STYROFOAM™ HIGHLOAD 40 - Canada Commercial

Board Thickness(1), in R-Value(2) (RSI) Board Size, ft Edge Treatment Min Compressive Strength(3), psi
1.0 (25) 5.0 (0.87) 2 x 8 (600 x 2400) Butt Edge 40 (275)
1.5 (38) 7.5 (1.32) 2 x 8 (600 x 2400) Butt Edge 40 (275)
2.0 (50) 10.0 (1.76) 2 x 8 (600 x 2400) Butt Edge 40 (275)
3.0 (75) 15.0 (2.64) 2 x 8 (600 x 2400) Butt Edge 40 (275)

(1) Not all product sizes are available in all regions.

(2) R means resistance to heat flow. The higher the R-value or RSI (R-Value Système Internationale), the greater the insulating power. R-values are expressed in ft2• h•°F/Btu. RSI values are expressed in m2 °C/W. R-value determined by ASTM C518.

(3) Vertical compressive strength is measured at 10% deformation (5% for STYROFOAM™ Brand HIGHLOAD 40, 60 and 100 Insulation products) or at yield, whichever occurs first. Since STYROFOAM™ Brand Extruded Polystyrene products are visco-elastic materials, adequate design safety factors should be used to prevent long-term creep. Adequate design safety factors are needed. For more information visit our Answer Center.

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