Frequently Asked Questions (FAQ's)

DuPont™ ArmorWall Plus Fire-Rated (FR) Structural Insulated Sheathing™ (SIS) Panels

The strength of ArmorWall Plus FR SIS™ is due to our patented Fusion Technology and rigid component facing.  These innovations provide our panels with nearly twice the strength of similar products in the marketplace, most of which are manufacturing by laminating (similar to glueing) the structural and insulation layers together.  Delamination occurs when certain types of panels are exposed to moisture, heat or load.  

ArmorWall Plus FR SIS™ panels also:

  • Reduce cross-bracing of both wood and steel framing
  • Offer industry-leading pull-out strength
  • Have Dead Load Anchor Testing that yield very strong results
  • Can be used in high velocity wind and hurricane zones
  • Can be used in seismic sensitive areas

You can see more information on the strength and durability of ArmorWall Plus FR SIS™  in the Documentation section of our website.

The weight of ArmorWall Plus FR SIS™ panels varies based upon the thickness.  You can find this information within the data sheets for each individual product on the Documentation page.

Standard ArmorWall Plus FR SIS™ panels are 4′ x 8′.  Special order panels are available in 4’x 10′ and other sizes. Please contact Customer Service for more information.

Yes, the results are better than common OSB, and similar to 5/8” plywood and wood sheathing. This allows ArmorWall Plus FR SIS™ to be used in a structural wall element as required by the Structural Engineer for shear and wind requirements. Please refer to our Installation Guides in the Documentation page for more information.

For detailing windows with ArmorWall Plus FR SIS™, refer to our Installation Manuals (pg. 21-23) in the Documentation page. 

Currently we offer a ten-year material warranty on ArmorWall Plus FR SIS™ panels that is non-prorated over the period and limited to the cost of the materials and replacement.

Visit our Documentation section to view our warranty documents.

We pride ourselves on fast delivery for all customer orders, no matter the project need.  We offer two primary methods for purchase and delivery of ArmorWall Plus FR SIS™ panels, ArmorBoard Plus FR Structural Sheathing Returns, and ArmorSeal accessories:
  1. Purchase from an area Sales Representative with direct shipment from our manufacturing plant in Salisbury, North Carolina.  Under normal market conditions, lead times are generally two to four weeks to receive the material.
  2. Purchase and delivery from a regional or national Distribution Partner.  Lead times may be shorter in some areas from Distribution Partners that stock ArmorWall Plus FR SIS™ panels and accessories locally.
Visit our Where To Buy page for contact information on our area Sales Representatives and Distribution Partners.

Yes; it has passed the required ASTM testing and performs as such during our testing procedures.


We have developed the ArmorWall Fastener Guide to aid the installer and designer in understanding and purchasing the correct fastener for each application of the ArmorWall system.  Contact Customer Service if any questions about fastener selection.

Yes, approved fasteners are required when installing ArmorWall Plus FR SIS™ to ensure satisfactory installation and maintain our ten-year system warranty. 

If an Installer were to use non-approved fasteners such as non-exterior grade screws, the wall system would be susceptible to the elements such as moisture and freezing temperatures, causing it to corrode and rust. When you use ArmorWall Plus FR SIS™ tested and approved exterior grade screws, you don’t have this issue. All sheathing and cladding attachment screws are Tri-Seal coated by Concealor, providing long-term resistance to corrosion and salt water spray.

Approved fasteners may be purchased directly from our company or from Triangle Fastener.

No, seal only the fasteners that attach the ArmorWall Plus FR SIS™ panels to steel, wood, or concrete framing in order to ensure a continuous seal.

Yes, it’s true! Thanks to our patented Fusion Technology and the elements of which ArmorWall Plus FR SIS™ is comprised, the structural strength of the panel allows direct attachment of cladding to the panel without the requirement of pin-pointing the studs beyond. View our Documentation page for more information on cladding and ArmorWall Plus FR SIS™.

Yes, ArmorWall Plus FR SIS™ can be used with approved thin brick applications. Brands that can be used with ArmorWall Plus FR SIS™ are:

There are several key points which differentiate the ArmorWall Plus FR SIS™ system from the Magnesium Oxide board implementation in certain articles published about MgO board.

We employ rigorous quality control and assurance testing throughout the manufacturing of the MgO boards used, which results in a much lower level of Chlorides within the chemistry. The MgO implementation within the final product itself is vastly different from that which was observed in the construction assembly in said articles. In addition, the tested and approved coated system fasteners are Marine Grade 1000+ hour exposure rated, dissuading corrosion and degradation.

If you would like further information, we encourage you to reach out to your local sales representative.


ArmorWall Plus FR SIS™ has undergone rigorous testing to certify that each panel meets or exceeds code requirements for today’s structural assemblies. You can view our ArmorWall Rated Assemblies Handbook, our MaxFacts: Fire-Rated Edition document, or the safety data sheets on our Documentation page for more information.

Yes, standard ArmorWall Plus FR SIS™ panels have been tested and have achieved ratings for up to one (1) hour assemblies that are located within the UL Fire Resistance Design listing catalog. ArmorWall SP Plus FR SIS has been tested and achieved ratings for up to two (2) hour assemblies.

Several common assemblies can be found within the ArmorWall Rated Assemblies Handbook.

Yes, ArmorWall Plus FR SIS™  passed NFPA 285 standards testing on its own – without a required cladding on the front – which is incredibly unique in the building materials industry. In fact, ArmorWall FR SIS™ was tested without any cladding placed over the sheathing at all for the full duration of the test.

Being a NFPA 285 Approved Structural Insulated Sheathing, ArmorWall Plus FR SIS™ carries many properties that are unmatched within the marketplace today, and not found in typical commercial gypsum assemblies.

Click here to download our NFPA 285 Certificate of Completion.

Test reports are available per request; you can also find all of the data and results placed in the data sheets in the Documentation page.  The testing was completed by certified third party labs and organizations as required by ICC.

The ArmorWall Plus FR SIS™ brand of products are UL Classified, which is very unique.

The results speak for themselves and are proudly displayed within the UL Product IQ site under R39485. You may also click here to download our UL Certification and report. Our NFPA rating allows most UL tested, listed, and approved exterior finishes to qualify as part of the complete wall assembly.  This includes Type I, II, and III buildings. That information can be found within our NFPA approval summary pages.

All above-grade ArmorWall Plus FR SIS™ panels can be exposed for up to 180 days to UV and weather.

Have a question that's not answered here? Fill out the form below, and we will get back to you as soon as possible.