United States / Build / DuPont™ ArmorWall™ Plus structural insulated sheathing

DuPont™ ArmorWall™ Plus structural insulated sheathing

Name: DuPont™ ArmorWall™ Plus structural insulated sheathing
Brand: DuPont Performance Building Solutions

This is a listed siding assembly. Listing 8170-2425:0001. This site cites OSFM BML. Match the model and orientation.

DuPont documents ArmorWall Plus as a structural insulated sheathing panel with a 1/2-inch magnesium-oxide facer and fused polyurethane insulation, in 4-by-8-foot panels. CAL FIRE OSFM listing 8170-2425:0001 covers the configuration with up to 2.25 inches of insulation fused to the facer, for a nominal maximum overall thickness of 2.75 inches.

Kind: listed-assembly. Brand: DuPont Performance Building Solutions. Listing evidence: OSFM WUI handbook 2026-08-25. Page reviewed 2026-08-25. JSON (CC BY 4.0)

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Documented attributes

Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.

Attribute	Value	Evidence source
Form
Solid surface	Yes	DuPont ArmorWall Plus Fire-Rated structural insulated sheathing (manufacturer)
Dimensions
Width	48 in	DuPont ArmorWall Plus Fire-Rated structural insulated sheathing (manufacturer)
Length	96 in	DuPont ArmorWall Plus Fire-Rated structural insulated sheathing (manufacturer)

Program	ID / source	Evidence date	Expires	Status
CAL FIRE BML	8170-2425:0001 · Search BML for 8170-2425:0001	2026-08-25	2027-06-30	listed

Tests and programs cited

OSFM BML · listing-program

Models named on the listing

Model	Application
ArmorWall Plus 2-inch panel	exterior wall sheathing; 1/2-inch magnesium-oxide facer with 1-1/2-inch insulation
ArmorWall Plus 2-3/4-inch panel	exterior wall sheathing; 1/2-inch magnesium-oxide facer with 2-1/4-inch insulation

Specification notes

Match the overall panel thickness, magnesium-oxide facer, insulation thickness, coating, fasteners, joints, water-resistive barrier, and wall assembly to OSFM listing 8170-2425:0001 and current DuPont instructions. Fire-resistance claims apply to complete assemblies, not this panel alone.

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Requirement constraints (16)

Each table compares this product's documented attributes with one published requirement. The comparison does not change from place to place, so it is printed once.

ORSC R327 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

IWUIC Class 1–2 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

IWUIC Class 1 wall-base protection undocumented
Field	Required	Documented value	State
Assembly role	Assembly role = wall base protection	Not documented	undocumented
Height	Height ≥ 6 in	Not documented	undocumented
Noncombustible	Noncombustible = Yes	Not documented	undocumented

California noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

California one-hour exterior wall undocumented
Field	Required	Documented value	State
Fire resistance	Fire resistance ≥ 60 min	Not documented	undocumented

California SFM 12-7A-1 wall undocumented
Field	Required	Documented value	State
Test standard	Test standard = sfm 12 7a 1	Not documented	undocumented

Colorado CWRC noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

Colorado CWRC wall-base protection undocumented
Field	Required	Documented value	State
Assembly role	Assembly role = wall base protection	Not documented	undocumented
Height	Height ≥ 6 in	Not documented	undocumented
Noncombustible	Noncombustible = Yes	Not documented	undocumented

2018 IWUIC Class 1–2 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

Kittitas IR1 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

Kittitas IR1 one-hour wall undocumented
Field	Required	Documented value	State
Fire resistance	Fire resistance ≥ 60 min	Not documented	undocumented

Kittitas Table 503.1 N.C. wall undocumented
Field	Required	Documented value	State
Fire resistance	Fire resistance ≥ 60 min	Not documented	undocumented
Noncombustible	Noncombustible = Yes	Not documented	undocumented

2021 IWUIC Class 1–2 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

2006 Utah UWUI Class 1–2 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

2006 Utah UWUI Class 1–2 one-hour wall undocumented
Field	Required	Documented value	State
Fire resistance	Fire resistance ≥ 60 min	Not documented	undocumented

2006 Utah UWUI Table 503.1 N.C. wall undocumented
Field	Required	Documented value	State
Fire resistance	Fire resistance ≥ 60 min	Not documented	undocumented
Noncombustible	Noncombustible = Yes	Not documented	undocumented

Sources

OSFM Building Materials Listing (live database) — CAL FIRE OSFM (listing-body). Accessed 2026-08-23.
DuPont ArmorWall Plus Fire-Rated structural insulated sheathing — DuPont Performance Building Solutions (manufacturer). Accessed 2026-08-25.

DuPont™ ArmorWall™ Plus structural insulated sheathing. FireApproved. https://fireapproved.com/materials/ddp-specialty-electronic-materials-us-llc-duponttm-armorwalltm-plus/. Last verified 2026-08-25.