Home / Materials / WoodSyn OptimBoard™ wood-wool cement sheathing
WoodSyn OptimBoard™ wood-wool cement sheathing This is a listed siding assembly. Listing 8170-2435:0001. This site cites cal-fire-bml. Match the model and orientation. A listing is not a permit.
Listed · multiple independent channels. Active CAL FIRE BML listing 8170-2435:0001, expires 2027-06-30 (verified against the live BML 2026-08-25). Multiple independent channels agree; each is shown below.
▲ CAL FIRE BML 8170-2435:0001 · active ▲ documented attributes match 8 requirements
Status derived from the cited listings by a published rule, never hand-assigned. Each chip
above is one evidence channel and its direction. A listing is not a permit — the authority
having jurisdiction decides.
WoodSyn describes OptimBoard as a noncombustible, Class A wood-wool cement panel. CAL FIRE OSFM listing 8170-2435:0001 covers 2400-by-600-millimetre boards from 1 through 4 inches thick as exterior sheathing in wood-framed walls, installed behind a WUI-approved exterior wall covering.
Kind: listed-assembly.
Brand: WoodSyn, LLC . Listing evidence: OSFM WUI handbook 2026-08-25.
Page reviewed 2026-08-25. JSON (CC BY 4.0)
Documented attributes Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.
Published requirement matches These links are generated from the cited attributes above. They do not decide installation or a project result.
Models named on the listing Model Application OptimBoard 1-inch panel 2400 × 600 mm exterior wall sheathing behind a WUI-approved wall covering OptimBoard 2-inch panel 2400 × 600 mm exterior wall sheathing behind a WUI-approved wall covering OptimBoard 3-inch panel 2400 × 600 mm exterior wall sheathing behind a WUI-approved wall covering OptimBoard 4-inch panel 2400 × 600 mm exterior wall sheathing behind a WUI-approved wall covering
The OSFM listing covers OptimBoard as sheathing behind a WUI-approved exterior wall covering, not as the exposed covering. Match panel thickness and dimensions, framing, fasteners, joints, covering, and assembly details to listing 8170-2435:0001 and current WoodSyn instructions. OSFM listing is not a permit. The authority having jurisdiction decides. Can I use this here
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In this place , this meets the model code 2018 IWUIC Class 1–2 noncombustible wall rule.
In this place , this meets the adopted IWUIC Class 1–2 noncombustible wall rule.
In this place , this meets the adopted California noncombustible wall rule.
In this place , this meets the available for local adoption Colorado CWRC noncombustible wall rule.
In this place , this meets the adopted 2018 IWUIC Class 1–2 noncombustible wall rule.
In this place , this meets the available for local adoption ORSC R327 noncombustible wall rule.
In this place , this meets the adopted ORSC R327 noncombustible wall rule.
In this place , this meets the adopted 2021 IWUIC Class 1–2 noncombustible wall rule.
In this place , this meets the adopted 2006 Utah UWUI Class 1–2 noncombustible wall rule.
In this place , this meets the adopted Kittitas IR1 noncombustible wall rule.
The rule and every matching product for the United States
Save to my house How this product meets each requirement (16)
Requirement constraints (16)
Each table below compares this product's documented attributes against one published
requirement. That comparison is a fact about the product and the requirement, and does not
change from place to place, so it is printed once.
Requirement constraints (16)
Each table compares this product's documented attributes with one published
requirement. That comparison does not change from place to place, so it is printed
once here and linked from every jurisdiction below.
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 SFM 12-7A-1 wall undocumented Field Required Documented value State Test standard Test standard = sfm 12 7a 1 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 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
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
Where this applies
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JSON twin .
WoodSyn OptimBoard™ wood-wool cement sheathing. FireApproved. https://fireapproved.com/materials/woodsyn-llc-optimboardtm/. Last verified 2026-08-25. Verify at the source. Every listing number and claim here links to its origin — listings change and local amendments govern, so check the current record before you specify.