DuPont™ Thermax™ Sheathing Foam Insulation

 
 
 
Commercial | Residential | Multifamily | Wall

Engineered for concealed and exposed applications

A non-structural rigid board material, Thermax™ Sheathing consists of a fiberglass-infused foam core that helps improve fire performance and dimensional stability. 

 
 
 
 
 
 

DuPont™ Thermax™ Sheathing Foam Insulation

Thermax™ Sheathing* is a non-structural, rigid board insulation consisting of a glass-fiber-infused polyisocyanurate foam core laminated between 1.0 mil smooth, reflective aluminum facers on both sides. The glass-fiber reinforcement contributes to improved fire performance and dimensional stability.

* Thermax™ Sheathing is a former product of The Dow Chemical Company

 
 
 

Features & benefits

Feature Benefit
Easy to cut, handle, and install
  • Easy to use
  • Moisture Resistant
  • Reduces the potential for condensation within the wall assembly
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    Physical properties

    Method Unit Value
    Compressive Strength1 ASTM D1621 Psi, min (kPa) 25 (170)
    Water Absorption ASTM C209 % by volume, max. 0.1
    ASTM D2842 - 3.5
    Water Vapor Permeance ASTM E96 perm, max (ng/Pa-s-m2) <0.03 (<15)
    Maximum Use Temperature - °F 250
    Flexural Strength ASTM C203 Psi, min (kPa) 40 (275)
    Tensile Strength ASTM D1623 Psi, min (kPa) 24 (170)
    Dimensional Stability ASTM D2126 % 0.2

    1 Vertical compressive strength is measured at 10 percent deformation or at yield, whichever occurs first

     
     
     

    Available sizes

    U.S.

    Thickness (in) R-Value Board Size (ft) Edge Treatment
    DuPont™ Thermax™ Sheathing Foam Insulation 0.5 3.3 4 x 8, 4 x 12 Square Edge
    .75 5.0 4 x 8, 4 x 12 Square Edge
    1.0 6.5 4 x 8, 4 x 12 Square Edge
    1.5 9.8 4 x 8, 4 x 12 Square Edge, Shiplap
    1.55 10.1 4 x 8, 4 x 12 Square Edge, Shiplap
    2 13.0 4 x 8, 4 x 12 Square Edge, Shiplap
    2.5 15.8 4 x 8, 4 x 12 Square Edge, Shiplap
    3 18.6 4 x 8, 4 x 12 Square Edge, Shiplap
    3.5 21.3 4 x 8, 4 x 12 Square Edge, Shiplap
    4 24.0 4 x 8, 4 x 12 Square Edge, Shiplap
     
     
     

    Canada

    Thickness (mm) R-Value Board Size (mm) Edge Treatment
    DuPont™ Thermax™ Sheathing Foam Insulation 39 10.1 1220 x 2440 Square Edge, Shiplap
    51 13.0 4 x 8, 4 x 12 Square Edge, Shiplap
    64 15.8 4 x 8, 4 x 12 Square Edge, Shiplap
    76 18.6 4 x 8, 4 x 12 Square Edge, Shiplap
    89 21.3 4 x 8, 4 x 12 Square Edge, Shiplap
    102 24.0 1220 x 2440 Square Edge, Shiplap