DuPont™ ArmorWall II Fire-Rated (FR) Structural Insulated Sheathing (SIS)
Cuts Like Wood. Burns Like Concrete.
Featuring a 1/2″ layer of Magnesium Oxide (MgO) sheathing on the exterior and interior sides, DuPont™ ArmorWall II Fire-Rated (FR) Structural Insulated Sheathing (SIS) is a two-hour fire-resistant exterior insulated wall sheathing product.
ArmorWall II FR SIS
DuPont™ ArmorWall II Fire-Rated (FR) Structural Insulated Sheathing (SIS) is unique due to its additional layer of sheathing, made of Magnesium Oxide (MgO), a natural mineral with fire-resistant properties, on the interior face, encompassing the rigid foam insulation.
This addition makes ArmorWall II FR SIS two (2) hour assembly rated, twice that of our standard ArmorWall FR SIS™ panels.
ArmorWall II FR SIS arrives to the job site from our factory with no additional coatings, offering building owners and general contractors flexibility in the types of air and water control layers that will be used for their building envelope.
Due to the high strength and rigidness of the structural sheathing, ArmorWall II FR SIS has the ability to move the stud face to the exterior face of the sheathing and has been tested to support loads equivalent to most building cladding finishes, with minimal creep while under load.
The ArmorSeal line of products can be installed and cured in harsh weather conditions, with overall proven functionality of the panel in all outdoor environments
Once seam and fasteners have been sealed the enclosure may be considered “dried-in”, allowing interior construction to commence regardless of final exterior finish status.
Having undergone rigorous testing, ArmorWall II FR SIS allows projects to meet continuous insulation (ci), building codes, and construction schedules faster and cost effectively.
Features and Benefits
Ease of Installation
Cladding Attachment Support
Install in Harsh Weather
Panel Thickness (in.)
Board Size (ft.)
4′ x 8′
4′ x 8′
4′ x 8′