United States / Build / ROCKWOOL Comfortboard 80 exterior continuous insulation

ROCKWOOL Comfortboard 80 exterior continuous insulation

Name: ROCKWOOL Comfortboard 80 exterior continuous insulation
Brand: ROCKWOOL

This is a listed siding assembly. Listing 2440-2270:0500. This site cites ASTM E84. Match the model and orientation.

CAL FIRE OSFM listing 2440-2270:0500 covers ROCKWOOL Comfortboard 80 rigid stone-wool non-structural sheathing for exterior walls in 1.25-, 1.5-, 2-, 2.5-, and 3-inch thicknesses. ROCKWOOL's current technical data identifies ASTM E84 flame-spread and smoke-developed indices of zero and ASTM E136 noncombustibility.

Kind: listed-assembly. Brand: ROCKWOOL. 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
Material
Material	mineral	Comfortboard 80 exterior continuous insulation technical data sheet (manufacturer)
Fire
Noncombustible	Yes	Comfortboard 80 exterior continuous insulation technical data sheet (manufacturer)

Published requirement matches

These links are generated from the cited attributes above. They do not decide installation or a project result.

Colorado CWRC noncombustible wall · Colorado jurisdictions adopting CWRC in moderate or high mapped wildfire hazard areas
California noncombustible wall · California mapped fire hazard areas
2018 IWUIC Class 1–2 noncombustible wall · Jurisdictions adopting unamended 2018 IWUIC Chapter 5
2021 IWUIC Class 1–2 noncombustible wall · Jurisdictions adopting unamended 2021 IWUIC Chapter 5
IWUIC Class 1–2 noncombustible wall · Jurisdictions adopting unamended 2024 IWUIC Chapter 5
Kittitas IR1 noncombustible wall · Unincorporated Kittitas County IR1 construction
ORSC R327 noncombustible wall · Oregon local jurisdictions that adopted ORSC R327
2006 Utah UWUI Class 1–2 noncombustible wall · Utah local compliance agencies adopting the 2006 Utah Wildland-Urban Interface Code

Program	ID / source	Evidence date	Expires	Status
CAL FIRE BML	2440-2270:0500 · Search BML for 2440-2270:0500	2026-08-25	2027-06-30	listed

Tests and programs cited

ASTM E84 · test-method
ASTM E136 · test-method
OSFM BML · listing-program

Models named on the listing

Model	Application
Comfortboard 80	BML-listed thicknesses: 1.25, 1.5, 2, 2.5, and 3 inches

Specification notes

Category 2440 is a general insulation listing, not an OSFM WUI exterior-wall listing. Confirm whether the authority accepts it for the proposed WUI assembly.
Noncombustible insulation does not by itself establish that the complete wall assembly meets a fire-resistance, exterior-surface, or ignition-resistance requirement.

Can I use this here

Local force

The rule and every matching product for the United States

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 matched
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Yes	matched

IWUIC Class 1–2 noncombustible wall matched
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Yes	matched

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	Yes	matched

California noncombustible wall matched
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Yes	matched

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 matched
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Yes	matched

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	Yes	matched

2018 IWUIC Class 1–2 noncombustible wall matched
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Yes	matched

Kittitas IR1 noncombustible wall matched
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Yes	matched

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	Yes	matched

2021 IWUIC Class 1–2 noncombustible wall matched
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Yes	matched

2006 Utah UWUI Class 1–2 noncombustible wall matched
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Yes	matched

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	Yes	matched

Sources

OSFM Building Materials Listing search — CAL FIRE OSFM (listing-body). Accessed 2026-08-25.
Comfortboard 80 exterior continuous insulation technical data sheet — ROCKWOOL (manufacturer). Accessed 2026-08-25.
ROCKWOOL Comfortboard 80 — ROCKWOOL (manufacturer). Accessed 2026-08-25.

ROCKWOOL Comfortboard 80 exterior continuous insulation. FireApproved. https://fireapproved.com/materials/rockwool-comfortboard-80-exterior-continuous-insulation/. Last verified 2026-08-25.