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DuroSpan® Insulation
Durable rigid insulation

DuroSpan® Insulation is used in Cathedral Ceiling, Continuous Insulation, Exterior Foundation, Interior Basement Walls, Basement Floor and Under Slab.
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Main Applications:
• Retrofit & New Construction
• Exterior Insulating Sheathing
• Insulating Interior Basement Walls
• Insulating Foundation Walls
• Insulating Cathedral Ceilings

• Laminated/branded product with thin film on both sides
• Long-term R-value 3.9 per inch
• Closed cell insulation resists moisture

4x8 ft sheets
3/4, 1, 1-1/2, 2
inch thicknesses

DuroSpan (Type I) insulation complies with the requirements of ASTM
C578, Standard Specification for Rigid, Cellular Polystyrene Thermal
Applications using DuroSpan

Durospan Applications

Available exclusively at select Home Depots.
For a complete store list, contact us today!

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DuroSpan Insulation

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Specification Header

The table below provides material properties for DuroSpan insulation

Material Property Units ASTM Test
C578, Type I
Nominal Density pcf NA 1.00
Compressive Resistance1
Minimum @ 10% deformation
psi D1621 10.0
per inch thickness at mean temperature
40 0F ft2•hr•0F/Btu C518 4.2
75 0F 3.9
Water Vapor Permeance
Perm E96 5.0
Flexural Strength
psi C203 25.0
Dimensional Stability

% linear change D2126 2.0
Water Absorption3
% by volume D2861 4.0
Oxygen Index
volume % D2863 24
pcf C303 0.90

1 Compressive resistance measured at 10 percent in accordance with ASTM C578 is not intended for use when DuroSpan
insulation will be used to support long-term compressive loads.  Contact your Plasti-Fab technical representative for
additional information.
2  For additional information on thermal resistance requirements refer to ASTM C578.
3 ASTM Test Method C272 water absorption requires 24 hours submersion of specimen under water. The water absorption
values above are applicable to specific end-use design requirements only to the extent that the end-use conditions are similar
to requirements stated in the test method.