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Millboard's named deck products are listed with model-specific nominal dimensions and an attached-wall condition.
OSFM listing 8110-2379:0001 describes Enhanced Grain at nominal 1 by 7 inches, Enhanced Grain SB at nominal 1 by 5 inches, and Weathered Oak at nominal 1 by 8 inches. The handbook describes each as natural minerals bonded in a polymer resin with long fiber reinforcement. Match the model to its own nominal size; the shared composition does not make those dimensions interchangeable.
SFM 12-7A-4A is the cited test protocol. No ASTM E84 test was conducted for this listing; a flame-spread class from that method is therefore unavailable. For the attached exterior wall covering, OSFM requires noncombustible or ignition-resistant material.
Millboard's data sheet supplies the detailed product descriptions and installation instructions referenced by OSFM. Use it to identify the selected model and construction, then verify that model's GOVmotus listing with the attached-wall condition retained.
Documents for this product
Each link opens the publisher's own copy, so you read the revision they are shipping today.
Read 2026-08-28 from this repository's verified 2026-08-23 pdftotext extraction (docs/research/sources/osfm-wui-handbook-2025-09-02.txt); osfm.fire.ca.gov returns HTTP 403 to automated fetch.
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
deck surface
CAL FIRE OSFM Building Materials Listing — 8110-2379:0001(official-listing · Listing 8110-2379:0001, Description field)The Millboard Companies Enhanced Grain and Weathered Oak decking products are produced using polyurethane resin mixtures.
The Millboard Companies Enhanced Grain, nominal 1" x 7". FireApproved. https://fireapproved.com/materials/the-millboard-company-ltd-the-millboard-companies-enhanced-grain/. Last verified 2026-08-26.