United States / Build / ROCKWOOL Toprock DD low-slope roof insulation
ROCKWOOL Toprock DD low-slope roof insulation This is a listed roofing assembly. Listing 2440-2270:0503. This site cites ASTM E108 / UL 790. Match the model and orientation.
Listed · limited evidence. Active CAL FIRE BML listing 2440-2270:0503, expires 2027-06-30 (verified against the live BML 2026-08-25). Limited evidence: a single positive channel so far — more programs or documentation may still move this record. This status is computed from the cited evidence by the published rule, never hand-assigned.
▲ CAL FIRE BML 2440-2270:0503 · active
CAL FIRE OSFM listing 2440-2270:0503 covers ROCKWOOL Toprock DD dual-density uncoated stone-wool insulation board from 2 through 6 inches in half-inch increments. ROCKWOOL's current data sheet documents ASTM E84 and ASTM E136 performance and identifies UL 790 / ASTM E108 Class A roof-covering tests for assemblies containing the product.
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.
Models named on the listing Model Application Toprock DD BML-listed thicknesses: 2 through 6 inches in 0.5-inch increments
Specification notes Category 2440 is a general insulation listing, not the OSFM WUI category 8180 roof-covering list. The ASTM E108 / UL 790 Class A result belongs to documented roof assemblies. Toprock DD alone is not a Class A roof covering; confirm membrane, deck, attachment, and every classified-system condition. Can I use this here How this product meets each requirement (33)
Requirement constraints (33)
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 Class B roof floor undocumented Field Required Documented value State Assembly role Assembly role = roof assembly Not documented undocumented Fire rating Fire rating is one of class a, class b Not documented undocumented
ORSC R327 roof-profile closure undocumented Field Required Documented value State Assembly role Assembly role = roof profile closure Not documented undocumented
ORSC R327 valley flashing not matched Field Required Documented value State Assembly role Assembly role = valley flashing Not documented undocumented Sheet gauge Sheet gauge ≤ 26 Not documented undocumented Corrosion resistant Corrosion resistant = Yes Not documented undocumented Material Material is one of galvanized steel mineral not matched
Austin Zone C Class A roof undocumented Field Required Documented value State Assembly role Assembly role = roof assembly Not documented undocumented Fire rating Fire rating = class a Not documented undocumented Test standard Test standard is one of astm e108, ul 790 Not documented undocumented
IWUIC Class 1–2 Class A roof undocumented Field Required Documented value State Assembly role Assembly role = roof assembly Not documented undocumented Fire rating Fire rating = class a Not documented undocumented Test standard Test standard is one of astm e108, ul 790 Not documented undocumented
IWUIC roof-profile eave closure undocumented Field Required Documented value State Assembly role Assembly role = roof profile closure Not documented undocumented
IWUIC valley flashing not matched Field Required Documented value State Assembly role Assembly role = valley flashing Not documented undocumented Sheet gauge Sheet gauge ≤ 26 Not documented undocumented Corrosion resistant Corrosion resistant = Yes Not documented undocumented Material Material is one of galvanized steel mineral not matched
California Class A roof test path undocumented Field Required Documented value State Assembly role Assembly role = roof assembly Not documented undocumented Fire rating Fire rating = class a Not documented undocumented Test standard Test standard is one of astm e108, ul 790 Not documented undocumented
California roof-valley flashing not matched Field Required Documented value State Assembly role Assembly role = valley flashing Not documented undocumented Sheet gauge Sheet gauge ≤ 26 Not documented undocumented Corrosion resistant Corrosion resistant = Yes Not documented undocumented Material Material is one of aluminum, copper, galvanized steel, stainless steel, steel, zinc mineral not matched
IWUIC Class 3 Class B roof undocumented Field Required Documented value State Assembly role Assembly role = roof assembly Not documented undocumented Fire rating Fire rating is one of class a, class b Not documented undocumented Test standard Test standard is one of astm e108, ul 790 Not documented undocumented
Colorado CWRC Class A roof undocumented Field Required Documented value State Assembly role Assembly role = roof assembly Not documented undocumented Fire rating Fire rating = class a Not documented undocumented Test standard Test standard is one of astm e108, ul 790 Not documented undocumented
Colorado CWRC valley flashing not matched Field Required Documented value State Assembly role Assembly role = valley flashing Not documented undocumented Sheet gauge Sheet gauge ≤ 26 Not documented undocumented Corrosion resistant Corrosion resistant = Yes Not documented undocumented Material Material is one of galvanized steel mineral not matched
2018 IWUIC Class 1 Class A roof undocumented Field Required Documented value State Assembly role Assembly role = roof assembly Not documented undocumented Fire rating Fire rating = class a Not documented undocumented Test standard Test standard is one of astm e108, ul 790 Not documented undocumented
2018 IWUIC Class 2 Class B roof undocumented Field Required Documented value State Assembly role Assembly role = roof assembly Not documented undocumented Fire rating Fire rating is one of class a, class b Not documented undocumented Test standard Test standard is one of astm e108, ul 790 Not documented undocumented
2018 IWUIC Class 3 Class C roof undocumented Field Required Documented value State Assembly role Assembly role = roof assembly Not documented undocumented Fire rating Fire rating is one of class a, class b, class c Not documented undocumented Test standard Test standard is one of astm e108, ul 790 Not documented undocumented
2018 IWUIC valley flashing not matched Field Required Documented value State Assembly role Assembly role = valley flashing Not documented undocumented Sheet gauge Sheet gauge ≤ 26 Not documented undocumented Corrosion resistant Corrosion resistant = Yes Not documented undocumented Material Material is one of galvanized steel mineral not matched
Kittitas high/extreme Class A roof covering undocumented Field Required Documented value State Assembly role Assembly role = roof covering Not documented undocumented Fire rating Fire rating = class a Not documented undocumented
Kittitas low/general Class C roof floor undocumented Field Required Documented value State Assembly role Assembly role = roof covering Not documented undocumented Fire rating Fire rating is one of class a, class b, class c Not documented undocumented
Kittitas moderate Class B roof floor undocumented Field Required Documented value State Assembly role Assembly role = roof covering Not documented undocumented Fire rating Fire rating is one of class a, class b Not documented undocumented
2021 IWUIC Class 1–2 Class A roof undocumented Field Required Documented value State Assembly role Assembly role = roof assembly Not documented undocumented Fire rating Fire rating = class a Not documented undocumented Test standard Test standard is one of astm e108, ul 790 Not documented undocumented
2021 IWUIC Class 3 Class B roof undocumented Field Required Documented value State Assembly role Assembly role = roof assembly Not documented undocumented Fire rating Fire rating is one of class a, class b Not documented undocumented Test standard Test standard is one of astm e108, ul 790 Not documented undocumented
2021 IWUIC valley flashing not matched Field Required Documented value State Assembly role Assembly role = valley flashing Not documented undocumented Sheet gauge Sheet gauge ≤ 26 Not documented undocumented Corrosion resistant Corrosion resistant = Yes Not documented undocumented Material Material is one of galvanized steel mineral not matched
Prescott Class 3 Class A roof undocumented Field Required Documented value State Assembly role Assembly role = roof assembly Not documented undocumented Fire rating Fire rating = class a Not documented undocumented Test standard Test standard is one of astm e108, ul 790 Not documented undocumented
2006 Utah UWUI Class 1 Class A roof undocumented Field Required Documented value State Assembly role Assembly role = roof assembly Not documented undocumented Fire rating Fire rating = class a Not documented undocumented
2006 Utah UWUI Class 2 Class B roof undocumented Field Required Documented value State Assembly role Assembly role = roof assembly Not documented undocumented Fire rating Fire rating is one of class a, class b Not documented undocumented
2006 Utah UWUI Class 3 Class C roof undocumented Field Required Documented value State Assembly role Assembly role = roof assembly Not documented undocumented Fire rating Fire rating is one of class a, class b, class c Not documented undocumented
2006 Utah UWUI Class A roof covering undocumented Field Required Documented value State Assembly role Assembly role = roof covering Not documented undocumented Fire rating Fire rating = class a Not documented undocumented
ROCKWOOL Toprock DD low-slope roof insulation. FireApproved. https://fireapproved.com/materials/rockwool-toprock-dd-low-slope-roof-insulation/. 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.