Engineered for both concealed and exposed applications, DuPont™ Thermax™ Sheathing is an easy-to-use nonstructural rigid insulation board with a fiberglass-infused foam core that helps improve fire performance and dimensional stability.
Thermax™ Sheathing
DuPont™ Thermax™ Sheathing is a multipurpose, nonstructural, rigid board insulation that is quick and easy to install in a wide range of exposed and concealed cavity wall applications. It consists 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. DuPont™ Thermax™ Brand insulation delivers wall performance you can count on. It’s ready to meet your toughest building challenges – both outside and inside the wall – with a robust ISO insulation product line and an R-value that’s proven consistent over time and a range of temperatures.
Easy to cut, handle, and install |
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Moisture Resistant |
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  | Method | Unit | Value |
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Compressive Strength<sup>1</sup> | ASTM D1621 | Psi, min (kPa) | 25 (170) |
Water Absorption<sup></sup> | ASTM D2842 | - | 3.5 |
ASTM C209 | % by volume, max. | 0.1 | |
Water Vapor Permeance<sup></sup> | ASTM E96 | perm, max (ng/Pa-s-m2) | <0.03 (<15) |
Maximum Use Temperature<sup></sup> | - | °F | 250 |
Flexural Strength<sup></sup> | ASTM C203 | Psi, min (kPa) | 40 (275) |
Tensile Strength<sup></sup> | ASTM D1623 | Psi, min (kPa) | 24 (170) |
Dimensional Stability<sup></sup> | ASTM D2126 | % | 0.2 |
Width | Length |
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0 | 0 |
0 | 0 |
0 | 0 |