DuPont™ 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 also offers high, long-term thermal resistance, with facers that help prevent water and water vapor intrusion into the insulation foam allowing it to stabilize at a higher R-value*. In the USA, Thermax™ Sheathing can even be installed exposed to the interior without a thermal barrier. Used in conjunction with the appropriate joint closure system for the application, Thermax™ Sheathing – with its low perm rating – can help to reduce moisture condensation within and behind the insulation.
* Thermax™ Sheathing is a former product of The Dow Chemical Company
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