United States / Build / Model Ultra HT Wind & Water Seal® is a nominal 45-mil thick

Model Ultra HT Wind & Water Seal® is a nominal 45-mil thick

Name: Model Ultra HT Wind & Water Seal® is a nominal 45-mil thick
Brand: MFM Building Products

This is a listed roofing assembly. Listing 8180-2433:0001. This site cites OSFM BML. Match the model and orientation.

MFM Building Products listing 8180-2433:0001 in OSFM category 8180 (non-wood roof covering/assemblies for wildland urban interface (w.u.i)). Model Ultra HT Wind & Water Seal® is a nominal 45-mil thick, self-adhering underlayment constructed of cross-laminated polyethylene, and asphalt adhesive.

Kind: listed-assembly. Brand: MFM Building Products. Listing evidence: OSFM WUI handbook 2026-08-25. Page reviewed 2026-08-26. 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
Assembly role	roof underlayment	CAL FIRE OSFM Building Materials Listing — 8180-2433:0001 (official-listing · Listing 8180-2433:0001, Description field)Model Ultra HT Wind & Water Seal® is a nominal 45-mil thick, self-adhering underlayment constructed of cross-laminated polyethylene, and asphalt adhesive.

Where this product goes

FA Exhibit ROF-100. The roof system, named

Program	ID / source	Evidence date	Expires	Status
CAL FIRE BML	8180-2433:0001 · Search BML for 8180-2433:0001	2026-08-25	2027-06-30	listed
ICC-ES	ESR-1737 · Record	2026-08-24		listed

Tests and programs cited

OSFM BML · listing-program
ICC-ES · listing-program

Models named on the listing

Model	Application
Ultra HT Wind & Water Seal®

Specification notes

The live BML record names no test protocol in its description; confirm the test standard and exact models on GOVmotus before specification.

Sources

OSFM Building Materials Listing (live database) — CAL FIRE OSFM (listing-body). Accessed 2026-08-23.
ICC-ES ESR-1737 directory record — ICC Evaluation Service (listing-body). Accessed 2026-08-24.

Model Ultra HT Wind & Water Seal® is a nominal 45-mil thick. FireApproved. https://fireapproved.com/materials/mfm-building-products-model-ultra-ht-wind-water-seal/. Last verified 2026-08-26.