DuroFoam Plus 40 insulation is a Type 3, closed cell and moisture resistant insulation. With an R-value of 4.3 per inch for the life of the product, DuroFoam Plus 40 is a high compressive solution with a 40 psi compressive resistance. It is easy to install and can be used in many applications such as 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 DuroFoam Plus 40 insulation board provides a more durable product that is less susceptible to damage.

The higher compressive strength of DuroFoam Plus 40 makes it an excellent choice for under slab and below grade applications. Not only does it maintain its R-value for the life of the product, but provides the compressive resistance needed to meet strict building codes.

DuroFoam Plus insulation resists water absorption so it will retain its R-value even in applications where severe temperature differentials occur. Marking provided on the printed face of DuroFoam Plus insulation assist in cutting to required dimensions and spacing of fasteners into framing.

Available in:

  • 4x8 ft; 2 ft high bundles
  • Thicknesses of 3/4, 1, 1 ½, 2, 2 ½, 3 in. plus special order sizes
  • Laminated, versatile product
  • Thermal resistance - R-value 4.3/in.
  • Meets CAN/ULC-S701.1, Type 3
  • Compressive resistance 40 psi
  • CCMC 12426-L

Material Properties of DuroFoam® Plus 40 Insulation

Material Property Test Method Units Property Values
Compressive Resistance
Minimum @ 10% Deformation
ASTM
D1621
kPa
(psi)
276
(40)
Compressive Resistance
Minimum @ 1% Deformation
ASTM
D1621
kPa
(psi)
103
(15.0)
Compressive Modulus
Minimum
ASTM
D1621
kPa
(psi)
10345
(1500)
Thermal Resistance
Minimum RSI per 25mm (1 inch)
ASTM
C518
m20C/W
(ft2•h•0F/BTU)
0.75
(4.3)
Flexural Strength
Minimum
ASTM
C203
kPa
(psi)
414
(60)
Water Vapour Permeance
Maximum
ASTM
E96
ng/(Pa.s.m2)
(Perms)
30
(0.5)
Water Absorption
Maximum
ASTM
D2842
% By Volume 2.0
Dimensional Stability
Minimum
ASTM
D2126
% Linear Change 1.5
Limiting Oxygen Index
Minimum
ASTM
D2863
% 24
Thermal Resistance for Some Common Thicknesses
Millimeters RSI Inches R-Value
19 0.49 3/4" 2.81
25 0.65 1" 3.75
38 0.98 1 1/2" 5.63
50 1.30 2" 7.50
75 1.95 3" 11.25
Other Standard & Custom thicknesses available upon request.
Standard sizes range from; 2x4,2x8,4x4,4x8.
DuroFoam® Plus 40 Insulation Projects

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