DuroSpan insulation is a Type 1, closed cell and moisture resistant insulation with a green film laminated to one side, and a silver film on the other side. With an R-value of 3.9 per inch, DuroSpan insulation is ideal for adding energy efficiency and cost savings to any project. It is easy to install and can be used in many applications; exterior sheathing, continuous insulation, basement floor, under slab insulation and cathedral ceilings. The addition of the laminated film to the top and bottom surfaces of DuroSpan insulation board provides a more durable product that is less susceptible to damage.

The reflective facer on DuroSpan insulation contains a thin layer of foil embedded within the film. The reflective facer does not increase the R-value of DuroSpan insulation.

DuroSpan insulation complies with the requirements of ASTM C578.

  • Available in 4x8 ft sheets
  • ¾, 1, 1 ½, 2 in. plus special order sizes
  • Meets all building code requirements
  • Meets ASTM C578, Type 1
  • Laminated/branded product with thin film on both sides
  • Thermal resistance - R-value 3.9/inch
  • Closed cell insulation resists moisture
  • For Retrofit and New Construction

Material Properties of DuroSpan® Insulation

Material Property Units Test Method C578, Type I Values
Nominal Density pcf NA 1.00
Compressive Resistance
Minimum @ 10% Deformation
psi D1621 10.0
per inch thickness at mean temperature
40 °F ft2•hr•0F/Btu C518 4.2
75 °F 3.9
Water Vapour Permeance
Maximum - 25mm (1 inch) thickness
Perm E96 5.0
Flexural Strength
psi C203 25.0
Dimensional Stability
Maximum, 7 Days @ 70± 2℃ (158±40F)
% linear change D2126 2.0
Water Absorption
% by volume D2861 4.0
Oxygen Index
volume % D2863 24
pcf C303 0.90
DuroFoam® Insulation Projects

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