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PlastiSpan® 20 Insulation
Increased R-value & compressive resistance

PlastiSpan® 20 Insulation is used in Foundation Walls, Concrete Slabs, Ice Rinks and Low Temperature Freezer Floors & Walls.


PlastiSpan® 20 insulation is a closed cell expanded polystyrene (EPS)
insulation that meets the requirements of CAN/ULC-S701, Standard for
Thermal Insulation, Polystyrene, Boards and Pipe Covering
and ASTM
C578, Standard Specification for Rigid, Cellular Polystyrene Thermal
Insulation. 

The closed cell structure of PlastiSpan 20 insulation resists water absorption
so it will retain its R-value even in applications where severe temperature
differentials occur. PlastiSpan 20 insulation has a range of compressive
resistance values which makes it ideal to insulating floors, foundations or
any application where heavy loads are expected. PlastiSpan 20 insulation
material property values for use in load bearing applications are provided
below.





The table below provides material properties for PlastiSpan 20 insulation meeting CAN/ULC-S701, Type 2.

Material Property Test Method Units PlastiSpan 20 Insulation Type
Compressive Resistance
Minimum @ 10% Deformation
ASTM
D1621
kPa
(psi)
140
(20)
Compressive Resistance
Minimum @ 1% Deformation
kPa
(psi)
50
(7.3)
Compressive Modulus
Minimum
kPa
(psi)
5,034
(730)
Thermal Resistance
Minimum per 25 mm (1 inch)
ASTM
C518
m20C/W
(ft2•h•0F/BTU)
0.70
(4.04)
Flexural Strength
Minimum
ASTM
C203
kPa
(psi)
280
(40)
Water Vapour Permanence5
Maximum
ASTM
E96
ng/(Pa.s.m2)
(Perms)
200
(3.5)
Water Absorption6
Maximum
ASTM
D2842
% by volume 2.0
Dimensional Stability
Maximum
ASTM
D2126
% Linear
Change
1.5
Limiting Oxygen Index
Minimum
ASTM
D2863
% 24


Dependent upon the initial deformation due to a compressive load, sustained loads on PlastiSpan 20
insulation may result in deflection much greater over time.  Figure 1 provides a series of curves
representing the long term deflection over time for various EPS insulation densities based
upon sustaining compressive loads at different % strain levels.




It should be noted that compressive resistance at 1% strain is within the elastic limit for the
PlastiSpan insulation types in the above table and is accepted as the design compressive resistance
to limit long-term deformation under structural load. Compressive resistance at 10% strain is not used
for design purposes when an insulation material will be under compressive load. It is typically used for
quality control purposes or may be applicable for end-uses where the application requires long-term
deformation under structural load – i.e., a compressible product.